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OPERATOR MAINTENANCEINSTRUMENT PANEL CONTROLS AND INDICATORS

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of instrument panel controls andindicators which are used in the operation of HEMTT series vehicles. Controls andindicators described in this section are the same for all vehicles, except where otherwiseindicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about instrumentpanel controls and indicators.

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Table 1. Instrument Panel Controls and Indicators.

Key

Control/

Indicator Function

AIR BRAKE

EXEXEX

EXEXEX

EXEXEX

ENGINE

OFF

ON

START

TRAILER

AIR SUPPLY

PARKING

BRAKE

1

24 5 6 7 9 8

10

3

Figure 1.

1 PARKINGBRAKEControl

Applies and releases vehicle parking brakes.

2 Left TurnIndicator

Flashes (green) when left turn signal is on.

3 Speedometer/ Odometer

Shows vehicle traveling speed (in MPH and Km/h) and totalmiles traveled.

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Table 1. Instrument Panel Controls and Indicators. - Continued

Key

Control/

Indicator Function

4 High BeamIndicator

Illuminates (blue) when vehicle headlights are on high beam.

5 Tachometer/ Hourmeter

Displays engine operating speed (RPM x 100) and totaloperating time (HOURS).

6 Right TurnIndicator

Flashes (green) when right signal is on.

7 FUEL Gauge Displays amount of fuel in fuel tank.

8 TRANS TEMPGauge

Displays transmission fluid temperature in degreesFahrenheit (F) and Celsius (C).

9 OIL PRESSGauge

Displays engine oil pressure (psi and kPa).

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Key

Control/

Indicator Function

10 WATER TEMPGauge

Displays engine coolant temperature in degrees Fahrenheit(F) and Celsius (C).

AIR BRAKE

EXEXEX

EXEXEX

EXEXEX

ENGINE

OFF

ON

START

TRAILER

AIR SUPPLY

PARKINGBRAKE

11

18

1917 20 12 14

15

13

16

Figure 2.

11 CHECKENGINEIndicator

Illuminates (amber) when ECM detects a fault in the engine.Engine must be serviced by field level maintenance as soonas possible.

12 INTER-AXLEDIFF. LOCKIndicator

Indicator illuminates (orange) when TRACTION CONTROLis in INTER-AXLES DIFF. LOCK position.

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Key

Control/

Indicator Function

13 8x8 DRIVEIndicator

Illuminates (orange) when TRACTION CONTROL is in 8x8DRIVE position or when TRANSFER CASE is in LO.

14 Air FilterRestrictionIndicator

Displays condition of air cleaner filter. Indicator window willshow red when filter becomes clogged. VACUUM INCHESHO window displays degree of restriction. Push button on top

of gauge to reset.

15 TRACTIONCONTROLLever

Lever in left position (INTER-AXLE DIFF. LOCK) locks inter-axle differentials in front and rear tandems. Lever in rightposition (8x8 DRIVE), engages transfer case drive to frontaxles.

16 ETHER

START Control

Injects ether into engine intake manifold for cold weather

starting.

17 TRANSCHECKIndicator

Illuminates (yellow) when ECU detects a problem in thetransmission that requires maintenance attention as soon aspossible.

18 TRANS TEMPIndicator

Illuminates (red) when transmission oil temperature reaches250F (121C).

19 PARKINGBRAKEIndicator

Illuminates (red) when parking brake is activated.

20 CHECKGAUGESIndicator

Illuminates (amber) and is used as a warning to the operatorthat a potential engine damaging condition has beendetected. If indicator is lit, check gauges. If all gauges indicate

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Key

Control/

Indicator Function

normal condition, complete mission. Notify field levelmaintenance at completion of mission.

EXEXEX

EXEXEX

EXEXEX

ENGINE

OFF

ON

START

TRAILER

AIR SUPPLY

PARKING

BRAKE

29

2230

31

28 25

21

27

2324

26

Figure 3.

21 ENGINESwitch

Three position switch. Straight up is OFF position. ONposition operates electrical system. Hold switch in STARTposition to operate engine cranking circuit. When switch isreleased after engine starts, switch will return to ON position.

22 LOW AIRIndicator

Illuminates (red) and remains lit until airbrake air pressure ineach section of dual system is between 60 psi (414 kPa) to75 psi (517 kPa). Buzzer will sound anytime indicator is lit.

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Key

Control/

Indicator Function

23 AIR PRESSGauge

Displays air pressure (in psi and kPa) in both sections ofairbrake system. Green needle shows front section airpressure. Red needle shows rear section air pressure.

24 BATTERYGauge

Displays state of charge of batteries and alternator voltageoutput.

25 AMPERESGauge

Displays alternator output in Amperes.

26 TRAILER AIRSUPPLYControl

Supplies air to (push in) and shuts off (pull out) air to trailerbrake system. When TRAILER AIR SUPPLY control isapplied (pushed in), vehicle PARKING BRAKE controlactivates/deactivates the trailer parking brakes in concert with

the vehicle.

27 DIGN REQSwitch

Activates troubleshooting system used by maintenance todiagnosis engine problems.

28 OIL-WATERIndicator

Illuminates (red) when engine oil pressure is too low or whenengine coolant temperature too high. Buzzer sounds at thesame time.

29 LHS Indicator(M1120A2only)

Illuminates (green) when Hydraulic Selector Switch is inAUTO, MAN H.A., or MAN M.F. positions.

30 LHS NOTRANSIT(M1120A2only)

Illuminates (red) when LHS system is not properly stowed intransport position.

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Key

Control/

Indicator Function

31 LHS OVERLOAD Indicator(M1120A2only)

Illuminates (yellow) whenever main hydraulic relief valve isopened during loading or unloading. When light illuminates,driver will be warned that LHS has reached an overloadcondition or that hydraulic system is lifting very nearmaximum capacity. OVER LOAD indicator will come on anytime main relief valve is cracked open, therefore, load orunload operation may not come to a complete stop, but lightwill come on momentarily. This situation would indicate thatsystem is lifting near maximum capacity. If the LHS isoverloaded, the light illuminates and the system isautomatically blocked out. Off-load/on-load flatrack andattempt second operation. If, during this second attempt, theLHS shuts down, stop operation and redistribute weight orreduce payload before attempting load or unload. Whenattempting to load/unload Forward Repair System (FRS),manual procedures must be followed or LHS overload systemwill shut down the LHS system.

END OF WORK PACKAGE

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OPERATOR MAINTENANCEHEATER COMPARTMENT CONTROLS AND INDICATORS


This section displays the location and describes the use of heater compartment controlsand indicators which are used in the operation of HEMTT series vehicles. Controls andindicators described in this section are the same for all vehicles, except where otherwiseindicated.


Know the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about heatercompartment controls and indicators.

Table 1. Heater Compartment Controls and Indicators.

KeyControl/ Indicator Function

J AC OBS

CAUTION

ENG INE BRAKE

432

6

1

7

5

89

Figure 1.

1 HydraulicSelectorSwitch

(M1120A2only)

OFF position: The LHS is not operational. This mode is usedfor transport.

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Table 1. Heater Compartment Controls and Indicators. - Continued

Key

Control/

Indicator Function

AUTO position: For normal loading/unloading operations.

MAN H.A. (Manual Hook Arm): Places the LHS in manualmode for moving the hook arm when the AUTO modeelectronic circuits fail. Also used during loading/unloadingoperations to/from trailer or docks.

MAN M.F. (Manual Main Frame) position: Places the LHS inmanual mode for moving the main frame when the AUTOmode electronic circuits fail. Also used during loading/ unloading operations to/from trailer or docks.

MAN TRANS (Manual Transit) position: This position must beselected if vehicle is to travel after the LHS AUTO mode

electronic circuit has failed and the MAN H.A. and/or MANM.F. modes have been used.

CRANE/SRW position: Not used on this vehicle.

2 JACOBS ENGINEBRAKE ON/

OFF Switch

Supplies or shuts off electrical power to JACOBS ENGINEBRAKE.

3 JACOBS ENGINEBRAKEIndicator

Illuminates (green) when JACOBS ENGINE BRAKE ON-OFF switch is in ON position.

4 JACOBS ENGINE

Selects number of engine cylinders used for engine brakingaction. HIGH position provides maximum braking. LOWposition provides less engine braking.

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Key

Control/

Indicator Function

BRAKE HIGH/ LOW Switch

5 WIPER/ WASHERSwitch

Controls both wipers and washer.

Turn switch clockwise (CW):

1 click - Intermittent.

2 clicks - Steady (medium) speed.

3 clicks - Steady (fast) speed.

Push switch in to cycle washer.

Release switch to stop washer.

Some early HEMTT A2 vehicles may be equipped withpneumatic windshield wiper/washer. If this is the case, therewill be three control knobs instead of only one (shown) locatedin the same area. The individual button functions are listedbelow.

Forward Button - controls operation of left side wiper.

Middle Button - controls operation of right side wiper.

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Key

Control/

Indicator Function

Rear Button - controls washer.

6 TrailerHandbrakeControl

Used to test the trailer brakes. Pull control lever back to apply,push forward to release trailer brakes.

7 LHS SystemCircuit Breaker(M1120A2only)

Protects LHS System from electrical overload.

8 Light Control Controls all electrical power to all parts of lighting system.

9 AuxiliaryEquipmentCircuit Breaker

Protects auxiliary equipment from electrical overload.

J ACOBS

CAUTION

ENGINE BR AKE

14

1310

1112

15

16

17

Figure 2.

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Key

Control/

Indicator Function

17 PTO ENGAGEIndicator

Illuminates (red) when PTO ENGAGE control is set to ONposition.

J ACOBS

CAUTION

ENGINE BR AKE

XMSN

FUSE 1

SPARE

22

24

23

21201918

Figure 3.

18 CL LPS Switch Light control (8) must be in STOP LIGHT or SER DRIVEposition for CL LPS switch to work. Up position turnsclearance lights on. Down position turns clearance lights off.

19 DOME LightSwitch

Light control (8) must be in STOP LIGHT or SER DRIVEposition for CL LPS switch to work. Up position turns cabdome light on. Down position turns cab dome light off.

20 WORK LIGHTSwitch(M983A2,M983A2 LET,M984A2, andM1977A2 only)

Light control (8) must be in STOP LIGHT or SER DRIVEposition for CL LPS switch to work. Up position turns on worklights. Down position turns work lights off.

21 GPFU Switch Turns gas particulate filter unit (GPFU) ON/OFF.

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Key

Control/

Indicator Function

22 GAS ALARMSwitch

Turns M-8 chemical alarm ON/OFF.

23 XMSN FUSE Only applicable to vehicles equipped with 4500SPtransmission.

24 SPARE Only applicable to vehicles equipped with 4500SPtransmission.

END OF WORK PACKAGE

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OPERATOR MAINTENANCEOPERATOR AND CREW FOUR-POINT SEATBELT/AIR-RIDE SEAT ADJUSTMENT

CONTROLS


This section displays the location and describes the use of operator and crew four-pointseatbelt/air-ride seat adjustment controls which are used in the operation of HEMTT seriesvehicles. Controls and indicators described in this section are the same for all vehicles,except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORSKnow the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about operatorand crew four-point seatbelt/air-ride seat adjustment controls.

Table 1. Operator and Crew Four-Point Seatbelt/Air-Ride Seat Adjustment Controls.


H E I G H T A

D J .

12

1

2

6

2

3

5

4

Figure 1.

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Table 1. Operator and Crew Four-Point Seatbelt/Air-Ride Seat Adjustment Controls. - Continued

Key Control/ Indicator Function

1 Seatbelt Secures personnel to seat.

2 SeatConnectorStraps

Secures seat to cab frame.

3 HeightAdjustmentControl

Used to adjust seat height.

4 Forward/ BackwardAdjustment

Control

Used to move seat forward or backward on slides.

5 RideAdjustmentControl

Used to adjust seat tension and ride firmness.

6 Retractor Locks seatbelt in event of accident, stows belt when not inuse.

END OF WORK PACKAGE

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OPERATOR MAINTENANCE24V BATTERY DISCONNECT SWITCH


This section displays the location and describes the use of 24V Battery Disconnect Switchwhich is used in the operation of HEMTT series vehicles. Controls and indicators describedin this section are the same for all vehicles, except where otherwise indicated.


Know the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about 24V BatteryDisconnect Switch.

Table 1. 24V Battery Disconnect Switch.


Figure 1.

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Table 1. 24V Battery Disconnect Switch. - Continued

Key

Control/

Indicator Function

1 24V BATTERYDISCONNECTSwitch

When in the ON position, power is available to controlmodules and electrical system. When in OFF position, batterydoes not run down due to control module load.

END OF WORK PACKAGE

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OPERATOR MAINTENANCEHYDRAULIC SELECTOR VALVE CONTROL


This section displays the location and describes the use of Hydraulic Selector Valve Controlwhich are used in the operation of HEMTT series vehicles. Controls and indicatorsdescribed in this section are the same for all vehicles, except where otherwise indicated.


Know the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about HydraulicSelector Valve Control.

Table 1. Hydraulic Selector Valve Control.


1

Figure 1.

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Table 1. Hydraulic Selector Valve Control. - Continued

Key

Control/

Indicator Function

1 HydraulicSelector ValveControl

Diverts main hydraulic power to/from Heavy-Duty Winch:

Heavy-Duty Winch operation - PULL OUT.

All other operations - PUSH IN (shown).

END OF WORK PACKAGE

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OPERATOR MAINTENANCERIFLE STOWAGE MOUNT


This section displays the location and describes the use of Rifle Stowage Mounts which areused in the operation of HEMTT series vehicles. Controls and indicators described in thissection are the same for all vehicles, except where otherwise indicated.


Know the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about RifleStowage Mount.

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Table 1. Rifle Stowage Mount.

Key

Control/

Indicator Function

3

1

2

Figure 1.

1 Lower RifleMount

Holds butt of rifle.

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Table 1. Rifle Stowage Mount. - Continued

Key

Control/

Indicator Function

2 Rifle MountHandle

Secures heat guard of rifle against top rifle mount.

3 Top RifleMount

Holds heat guard of rifle.

END OF WORK PACKAGE

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OPERATOR MAINTENANCEARCTIC ENGINE HEATER CONTROLS AND INDICATORS


This section displays the location and describes the use of Arctic Engine Heater controlsand indicators (optional accessory) which are used in the operation of HEMTT seriesvehicles. Controls and indicators described in this section are the same for all vehicles,except where otherwise indicated.


Know the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about ArcticEngine Heater controls and indicators (optional accessory).

Table 1. Arctic Engine Heater Controls And Indicators.


E n

g i n

e P

r e h

e a

t e r

21

J ACOBS

CAUTION

ENGINE BR AKE

Figure 1.

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OPERATOR MAINTENANCEGAS PARTICULATE FILTER UNIT (GPFU) CONTROLS AND INDICATORS


This section displays the location and describes the use of Gas Particulate Filter Unit(GPFU) controls and indicators which is used in the operation of HEMTT series vehicles.Controls and indicators described in this section are the same for all vehicles, except whereotherwise indicated.


Know the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about GasParticulate Filter Unit (GPFU) controls and indicators.

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Table 1. Gas Particulate Filter Unit (GPFU) Controls And Indicators.

Key

Control/

Indicator Function

Figure 1.

1 Gas ParticulateFilter

Filters nuclear, biological, and chemical (NBC) contaminantsfrom air.

2 M-3 Heater Warms air entering protective mask.

3 M-3 HeaterControl Knob

Turn clockwise (CW) for warmer air turn counterclockwise(CCW) for cooler air. Turn to OFF to shut off heater.

4 M-3 HeaterIndicator Light

Illuminates when heater is operating.

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Table 1. Gas Particulate Filter Unit (GPFU) Controls And Indicators. - Continued

Key

Control/

Indicator Function

5 GASPARTICULATE FILTERUNIT Switch

Turns GPFU ON/OFF.

END OF WORK PACKAGE

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OPERATOR MAINTENANCEMACHINE GUN MOUNT


This section displays the location and describes the use of Machine Gun Mount (OptionalAccessory) which is used in the operation of HEMTT series vehicles. Controls and indicatorsdescribed in this section are the same for all vehicles, except where otherwise indicated.


Know the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about MachineGun Mount (Optional Accessory).

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Table 1. Machine Gun Mount.

Key

Control/

Indicator Function

Figure 1.

1 Machine GunMount

Secures machine gun to machine gun ring.

2 Machine GunRing

Allows machine gun to turn 360 degrees.

END OF WORK PACKAGE

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OPERATOR MAINTENANCEM-8 CHEMICAL ALARM CONTROLS AND INDICATORS


This section displays the location and describes the use of M-8 Chemical Alarm controlsand indicators which are used in the operation of HEMTT series vehicles. Controls andindicators described in this section are the same for all vehicles, except where otherwiseindicated.


Know the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about M-8Chemical Alarm controls and indicators.

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Table 1. M-8 Chemical Alarm Controls And Indicators.

Key

Control/

Indicator Function

J ACOBS

CAUTION

ENGINE BRAKE

2

1

3

Figure 1.

1 M-8 ChemicalAlarm Switch

Operates alarm.

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Table 1. M-8 Chemical Alarm Controls And Indicators. - Continued

Key

Control/

Indicator Function

2 M-8 ChemicalAlarm

Sounds alarm when chemicals are detected.

3 ChemicalDetector

Detects presence of chemical in the air.

END OF WORK PACKAGE

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OPERATOR MAINTENANCEM-13 DECONTAMINATION KIT


This section displays the location and describes the use of M-13 Decontamination Kit whichis used in the operation of HEMTT series vehicles. Controls and indicators described in thissection are the same for all vehicles, except where otherwise indicated.


Know the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about M-13Decontamination Kit.

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Table 1. M-13 Decontamination Kit.

Key

Control/

Indicator Function

Figure 1.

1 M-13DecontaminationUnit

Holds and dispenses decontaminant.

2 DecontaminationUnit Mount

Holds decontamination unit.

END OF WORK PACKAGE

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OPERATOR MAINTENANCERADIO INSTALLATION HARDWARE


This section displays the location and describes the use of radio installation hardware whichis used in the operation of HEMTT series vehicles. Controls and indicators described in thissection are the same for all vehicles, except where otherwise indicated.


Know the location and proper use of every control and indicator before operating HEMTTseries vehicles. Separate illustrations with keys are provided for learning about radioinstallation hardware.

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Table 1. Radio Installation Hardware.

Key

Control/

Indicator Function

J ACOBS

CAUTION

ENGINE BRAKE

1

2

3

Figure 1.

1 AntennaMatching Unit

Holds antenna.

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Table 1. Radio Installation Hardware. - Continued

Key

Control/

Indicator Function

2 Security UnitMount

Holds security unit.

3 Receiver/ TransmitterMount

Holds receiver/transmitter.

END OF WORK PACKAGE

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OPERATOR MAINTENANCEOPERATE WINDSHIELD WIPERS/WASHER

INITIAL SETUP:

Not Applicable

OPERATE WINDSHIELD WIPERS (24V)

NOTE Some earlier vehicles may be equipped with air driven windshield

wipers (refer to operate windshield wipers (air) below for operatingprocedures).

ENGINE switch must be positioned to ON for windshield wipers tooperate.

24V battery disconnect switch must be positioned to ON (WP 0076)to operate windshield wipers.

NOTEWhen WIPER/WASHER control is in the intermittent position, wipers willcycle at a faster rate the farther the control is rotated clockwise.

1. Rotate WIPER/WASHER control (1) clockwise to first position to operate wipers inintermittent.

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OPERATE WINDSHIELD WIPERS (24V) - Continued

J ACOBS

CAUTION

ENGINE BRAKE

T R A I L E R

A I R S U P

P L Y

N O T F O R

P A R K I N

G

M I D L A N

D P U L L

T O E XHAU

S T

P U S H T O S U P P L

1

Figure 1.

2. Rotate WIPER/WASHER control (1) clockwise to second position to operate wipersat LOW speed.

3. Rotate WIPER/WASHER control (1) clockwise to third position to operate wipers atHIGH speed.

4. Rotate WIPER/WASHER control (1) completely counterclockwise to stop wipers.

OPERATE WINDSHIELD WIPERS ON/OFF (AIR)

NOTE Later model vehicles are equipped with 24V driven windshield wipers

(refer to operate windshield wipers (24V) above for operatingprocedures).

ENGINE switch must be positioned to ON for windshield wipers tooperate.

24V battery disconnect switch must be positioned to ON (WP 0076)to operate windshield wipers.

1. Turn WIPER control (1) clockwise to start and control speed of driver side windshieldwiper.

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OPERATE WINDSHIELD WIPERS ON/OFF (AIR) - Continued

J ACOB S

CAUTION

ENGINE BRAKE

T R A I L E R

A I R S U P

P L Y

N O T F O R

P A R K I N G

M I D L A N

D P U

L L T O

E XHAU S

T

P U S HT O S U P P

2

1

Figure 2.

2. Turn WIPER control (2) clockwise to start and control speed of passenger sidewindshield wiper.

3. Turn WIPER control (1) counterclockwise to stop driver side windshield wiper.

4. Turn WIPER control (2) counterclockwise to stop passenger side windshield wiper.

5. If wiper stops in middle of windshield:

a. Turn appropriate WIPER control (1 or 2) clockwise until wiper is at bottom of

windshield.b. Turn appropriate WIPER control (1 or 2) counterclockwise to stop wiper.

OPERATE WINDSHIELD WASHER (24V)

NOTE Some earlier vehicles may be equipped with air driven windshield

washer (refer to operate windshield washer (air) below for operatingprocedures).

24V battery disconnect switch must be positioned to ON (WP 0076)to operate windshield washer.

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OPERATE WINDSHIELD WASHER (24V) - Continued

ENGINE switch must be positioned to ON for windshield washer to

operate.1. Push in and hold WIPER/WASHER control (1) to spray cleaning fluid on windshield.

J ACOBS

CAUTION

ENGINE BRAKE

T R A I L E R

A I R S U P

P L Y

N O T F O R

P A R K I N G

M I D L A N

D P U L L

T O E XHAU

S T

P U S H T O S U P P L

1

Figure 3.

2. Release WIPER/WASHER control (1) to stop spray.

OPERATE WINDSHIELD WASHER (AIR)

NOTE Later model vehicles are equipped with 24V driven windshield

washer (refer to operate windshield washer (24V) above for operatingprocedures).

24V battery disconnect switch must be positioned to ON (WP 0076)to operate windshield washer.

ENGINE switch must be positioned to ON for windshield washer tooperate.

1. Push in and hold WASH control (1) to spray cleaning fluid on windshield.

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OPERATE WINDSHIELD WASHER (AIR) - Continued

J ACOB S

CAUTION

ENGINE BRAKE

T R A I L E R

A I R S U P

P L Y

N O T F O R

P A R K I N G

M I D L A N

D P U

L L T O

E XHAU S

T

P U S HT O S U P P

1

Figure 4.

2. Release WASH control (1) to stop washer spray.

END OF TASK

END OF WORK PACKAGE

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OPERATOR MAINTENANCEOPERATE CAB TEMPERATURE CONTROLS

INITIAL SETUP:

Not Applicable

OPERATE PERSONNEL HEATER

NOTE If heater does not blow hot air, ensure heater valves are open.

Air temperature is controlled by position of HEAT control.

Pull HEAT control out to increase temperature.

Push HEAT control in to decrease temperature.

1. Pull out HEAT control (1) to desired position.

2. Set FAN switch (2) to LO or HI airflow.

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OPERATE PERSONNEL HEATER - Continued

J ACOBS

CAUTION

DEFROS T

HEA T

AIR

-OFF-H

I

FAN

ENGINE BRAKE

AIR

HEAT

DEFROST

LO-OFF-HI

FAN

3

1

4

2

Figure 1.

NOTEOn later model vehicles, the AIR control has a "TURN TO LOCK" functionwhich holds the vent open at the desired level when the control is rotatedclockwise. Rotate control CCW until it stops to unlock the vent.

3. Adjust AIR control (3) as desired to control outside airflow for cab ventilation. Unlock,and push AIR control (3) all the way in to shut outside air ventilation off.

4. When personnel heater is no longer required:

a. Push in HEAT control (1) to turn heater off.

b. Set FAN switch (2) to OFF.

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OPERATE WINDSHIELD DEFROST

NOTE

If windshield defrost does not blow hot air, ensure heater valves are open.1. Pull out DEFROST control (4) to turn on.

J ACOBS

CAUTION

DEFROS T

HEA T

AIR

-OFF-H

I

FAN

ENGINE BRAKE

AIR

HEAT

DEFROST

LO-OFF-HI

FAN

3

1

4

2

Figure 2.2. Pull out HEAT control (1) to desired position.

3. Set FAN switch (2) to desired position.

4. When defrost is no longer required:

a. Push in DEFROST control (4) to turn off.

b. Push in HEAT control (1) to turn heater off.

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OPERATE WINDSHIELD DEFROST - Continued

c. Set FAN switch (2) to OFF.

END OF TASK

END OF WORK PACKAGE

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OPERATOR MAINTENANCEOPERATE FIRE EXTINGUISHER

INITIAL SETUP:

Not Applicable

REMOVE FIRE EXTINGUISHER FROM CAB

NOTEFire extinguisher is located on rear bulkhead on inside of cab, just inboardof drivers seat.

1. Pull up top clamp (1) and disengage from top hook (2).

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REMOVE FIRE EXTINGUISHER FROM CAB - Continued

6

2

4

1

3

5

Figure 1.

2. Pull up bottom clamp (3) and disengage from bottom hook (4).

3. Remove fire extinguisher (5) from bracket (6).

EXTINGUISH FIRE

NOTE Fire extinguisher is a dry chemical type. Refer to MSDS for specific

extinguisher warnings and cautions for use. Remember the word "PASS" to operate fire extinguisher:

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EXTINGUISH FIRE - Continued

.

1. Hold fire extinguisher (1) upright and pull safety pin (2) to break plastic tie (3).

Figure 2.

2. Point nozzle (4) at base of fire.

3. Press down on stop lever (5) and spray discharge in a side-to-side motion at base of

fire.4. Let go of stop lever (5) when fire is out.

5. Notify field level maintenance to replace fire extinguisher.

INSTALL FIRE EXTINGUISHER IN CAB

1. Put neck of fire extinguisher (1) on bracket (2).

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OPERATOR MAINTENANCEOPERATE ACCESS LADDER

INITIAL SETUP:

Not Applicable

INSTALL ACCESS LADDER

NOTEM983 and M983 LET stow access ladder in same location. M983 shown.

1. Pull two pins (1) from brackets (2).

21

3

4

Figure 1.

2. Remove access ladder (3) from walkway grating (4).

STOW ACCESS LADDER

NOTE

M983 and M983 LET stow access ladder in same location. M983 shown.1. Place access ladder (1) in brackets (2).

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STOW ACCESS LADDER - Continued

23

1

4

Figure 2.

2. Install two pins (3) into brackets (2) on walkway grating (4).

END OF TASK

END OF WORK PACKAGE

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OPERATOR MAINTENANCEOPERATE DRAIN PLUG

INITIAL SETUP:

Not Applicable

REMOVE DRAIN PLUG

NOTEThere are two drain plugs. One located on each side of cab floor, justbelow operator/crew seats.

1. Pull up on lever (1).

Figure 1.

2. Remove drain plug (2) to drain any liquid from floor of cab.

INSTALL DRAIN PLUG

1. Push drain plug (2) in opening on cab floor.

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OPERATOR MAINTENANCEHEAVY-DUTY WINCH OPERATION USING VEHICLE MOUNTED (MANUAL)

CONTROLS

INITIAL SETUP:

Personnel RequiredOperator and Assistant - - - (2)

PREPARE TO OPERATE HEAVY-DUTY WINCH

WARNING

Due to reduced field of vision when using the vehicle mounted(manual) controls, the remote-control unit should always be used

when operating the heavy-duty winch. The vehicle mounted (manualcontrols) should only be used as a last resort (remote-control lost orinoperable). Failure to comply may result in injury or death topersonnel.

Use of vehicle mounted (manual) controls requires an additionalsafety observer whenever the heavy-duty winch is being operated.Failure to comply may result in injury or death to personnel.

Excessive noise levels are present any time the heavy-duty winch isoperating. Wear single hearing protection (earplugs or equivalent)

while working around equipment when it is running. Failure to complymay result in injury or death to personnel. Seek medical aid shouldyou suspect a hearing problem.

NOTEThis procedure is a two soldier task.

1. Start engine . (WP 0041)

2. Position tractor vehicle for straight pull and on solid ground so tires have good traction.

3. Set transmission range selector (1) to N (neutral).

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PREPARE TO OPERATE HEAVY-DUTY WINCH - Continued

JACOBS

CAUTION

ENGINE BRAKE

T R A IL E R

A I R S U P P L

Y

N O T F O R P A

R K IN G

M I D L A N D

P U L L

T O E X HAU S T

P U S H T O S U P P

L Y

XMSN

FUSE 1

SPARE

4

3

1

2

Figure 1.

NOTEDashboard parking brake indicator will illuminate when PARKINGBRAKE control is applied.

4. Pull out PARKING BRAKE control (2).

5. Set PTO ENGAGE switch (3) to OFF position. Indicator light (4) will go out.

CAUTIONDo not move hydraulic selector valve control while PTO ENGAGE switchis set to ON position. Failure to comply may result in damage to hydraulicequipment.

6. Pull out hydraulic selector valve control (5) for winching operations.

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PREPARE TO OPERATE HEAVY-DUTY WINCH - Continued

5

Figure 2.

7. Set PTO ENGAGE switch (3) to ON position. Indicator light (4) will illuminate.

JACOBS

CAUTION

ENGINE BRAKE

T R A I L E R

A IR S U P P

L Y

N O T FO R P AR K I N G

M ID L A N D

P U L L

T O E X HAU S T

P U S H T O S U P P

L Y

XMSN

FUSE1

SPARE

4

3

Figure 3.

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PAY OUT CABLE AND CONNECT TO EQUIPMENT

WARNING

Using remote-control unit and operating heavy-duty winch away fromvehicle will lessen the possibility of injury or death to personnel if winchcable separates under tension.

CAUTION Do not allow other vehicles to run over winch cable. Winch cable may

be damaged. Failure to comply may result in damage to equipment.

Cable Hold Down control should never be engaged (pushed in)during winch cable pay out under power. Failure to comply may resultin damage to equipment.

1. Disengage (pull out) Cable Hold Down control (1).

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PAY OUT CABLE AND CONNECT TO EQUIPMENT - Continued

2

1

Figure 4.

CAUTIONWinch KickOut control should never be engaged (pushed in) under load.Failure to comply may result in damage to equipment.

2. Disengage (pull out) Winch KickOut control (2).

3. Unhook clevis retention chain (3) from clevis (4).

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4

3

Figure 5.

NOTE Setting the HIGH IDLE switch to ON position enables fast speed in

heavy-duty winch. HIGH IDLE should only be used when normalspeed operation is too slow while loading mired equipment or asemitrailer laden with heavy equipment.

Due to the increased speed of winch cable payout, it is not

recommended that HIGH IDLE be used to pay out winch cable.4. Use of HIGH IDLE switch (5) is at the discretion of the operator.

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6

5

7

8

Figure 6.

WARNING

Heavy-duty winch operator shall ensure all personnel keep handsand feet clear of heavy-duty winch during operation. Failure to complymay result in injury or death to personnel.

Keep all personnel clear of area when tension is on winch cable.Winch cable could come loose or break. Failure to comply may resultin injury or death to personnel.

Always wear protective gloves when handling winch cable. Never letcable run through hands. Frayed cables can cut severely. Failure tocomply may result in injury or death to personnel.

Never operate winch with less than five wraps of cable on winchdrum. Failure to comply may result in injury or death to personnel.

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CAUTION

Ensure assistant routes winch cable to avoid snag hazards on tractorvehicle. Failure to comply may result in damage to equipment.

5. Pull winch control lever (6) to pay out winch cable (7) while assistant routes winchcable (7) to equipment. Release winch control lever (6) when it is determined amplewinch cable (7) is available for connection to equipment.

CAUTIONAlways be sure there are at least five wraps of winch cable on winch drum.If there are less than five wraps of winch cable on winch drum, winchcable may come loose and damage equipment.

NOTEEnsure weight of equipment and amount of winch cable left on winch doesnot go over pull capacity (refer to FM 4-30.31 and Heavy-Duty Winch PullCapacity Table below).

6. Check that there are at least five wraps of winch cable (7) on winch (8). If there arenot at least five wraps of winch cable (7) on winch (8), move tractor vehicle closer toequipment and continue loading, or shut down winch (8).

Table 1. Heavy-Duty Winch Pull Capacity.

CABLE LAYER CABLE ON DRUM (ft.) CAPACITY (lbs)

1 37 45,000

2 81 37,200

3 133 31,700

4 150 27,700

NOTEIf HIGH IDLE was not used, skip to Step (8).

7. Set HIGH IDLE switch (5) to OFF.

8. Connect winch cable (7) to equipment.

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LOAD EQUIPMENT

WARNING

Using remote-control unit and operating heavy-duty winch away fromvehicle will lessen the possibility of injury or death to personnel if winchcable separates under tension.

1. Engage (push in) Cable Hold Down control (1).

3

2

5

1

4

Figure 7.

CAUTIONWinch KickOut control should never be engaged (pushed in) under load.Failure to comply may result in damage to equipment.


3. Ensure loading area is clear of personnel.

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LOAD EQUIPMENT - Continued

WARNING





CAUTION

Gradually apply power to avoid high impact loading of winch cable.

NOTEMaintaining a safe distance, visually recheck your rigging once lighttension (slack taken out of winch cable) is applied to winch cable.

4. Push winch control lever (3) slightly to slowly tighten winch cable (4).



Due to the increased speed of winch cable payout, it is notrecommended that HIGH IDLE be used for loading an empty or lightlyladen semitrailer.

5. Use of HIGH IDLE switch (5) is at the discretion of the operator.

NOTEAssistant should be in a position to safely monitor the loading operationand advise the operator of progress.

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LOAD EQUIPMENT - Continued

6. Push winch control lever (3) and load equipment.

NOTEPull winch control lever just enough to allow adequate slack in winchcable to disconnect from equipment.

7. When equipment is fully loaded, pull winch control lever (3).

NOTEIf high idle was not utilized during winch cable pay out, skip Step (8).

8. Set HIGH IDLE switch (5) to OFF (as applicable).

DISCONNECT WINCH CABLE AND STOW

1. Ensure Cable Hold Down control (1) is engaged (pushed in).

5

3

4

1 27 6

8

Figure 8.

2. Disconnect winch cable (2) from equipment.

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DISCONNECT WINCH CABLE AND STOW - Continued

CAUTION

Winch KickOut control should never be engaged (pushed in) under load.Failure to comply may result in damage to equipment.




Due to the increased speed of winch cable payout, it is notrecommended that HIGH IDLE be used to reel in and stow winchcable.

4. Use of HIGH IDLE switch (4) is at the discretion of the operator.

WARNING





CAUTION Ensure assistant routes winch cable to avoid snag hazards on tractor

vehicle and semitrailer. Failure to comply may result in damage toequipment.

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Ensure tension is kept on winch cable at all times during winch cable

retrieval. This accompanied with guidance from the assistant willensure the winch cable gets evenly wrapped onto winch drum.

Both operator and assistant should ensure that winch cable wrapsproperly and evenly onto winch drum. Failure to comply may resultin damage to equipment.

5. Push in winch control lever (5) as assistant routes winch cable (2) onto winch drum(6).

6. Once winch cable (2) is completely and evenly wrapped onto winch drum (6), releasewinch control lever (5).

NOTEIf high idle was not utilized during winch cable pay out, skip to Step (8).

7. Set HIGH IDLE switch (4) to OFF (as applicable).

8. Assistant connects clevis retention chain (7) to clevis (8).

9. Set PTO ENGAGE switch (9) to OFF position. Indicator light (10) will go out.

J ACOBS

CAUTION

ENGINE BR AKE

T R A I L E R

A I R S U P P L Y

N O T F O R

P A R K I N G

M I D L A N D

P U L L

T O E X H AU

S T

P U S H T O S U P P

L Y

XMSN

FUSE 1

SPARE

10

9

Figure 9.

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CAUTION The operator should always push in hydraulic selector valve control

when use of the heavy-duty winch is no longer required to ensure theheavy-duty winch won't accidentally moved during other operations.

Do not move hydraulic selector valve control while PTO ENGAGEswitch is set to ON position. Failure to comply may result in damageto hydraulic equipment.

10. Push in hydraulic selector valve control (11) for all tractor vehicle operations that donot require use of heavy-duty winch.

11

Figure 10.

END OF TASK

END OF WORK PACKAGE

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OPERATOR MAINTENANCECONNECT/DISCONNECT M870/M870A1 SEMITRAILER

INITIAL SETUP:

Personnel RequiredOperator and Assistant - - - (2)

CONNECT M870/M870A1 SEMITRAILER

WARNING

This procedure should be performed on level ground. Failure tocomply may result in injury or death to personnel.

Operator must always be stationed in driver's seat any time thetractor vehicle is in N (neutral) with wheel chocks removed. Failureto comply may result in injury or death to personnel.

CAUTION Always refer to semitrailer specific operator's manual (TM

5-2330-378-14&P) prior to coupling. Failure to comply may result indamage to equipment.

Lockouts must be positioned as identified in Table 1. Failure tocomply may result in damage to equipment.

NOTE This procedure is a two soldier task.

Leave tractor vehicle running during procedure for heavy-duty winchoperation.

Tractor vehicle is equipped with fifth wheel to accept 3.5 in. (89 mm)kingpin.

If fifth wheel lockout assemblies are not positioned correctly,complete Step (2) or (3) as applicable.

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CONNECT M870/M870A1 SEMITRAILER - Continued

Remove lockout assembly only if desired lockring position (HALF

LOCK or FULL LOCK) is not located to the inside (against the fifthwheel). To remove lockout assembly, complete Step (2).

Loosen and rotate lockring if NO LOCK position is desired, or ifdesired lockring position (HALF LOCK or FULL LOCK) is located tothe inside (against the fifth wheel). To loosen and rotate lockoutassembly, complete Step (3).

1. Refer to Table 1. to determine whether lockout assembly lockrings are in correctposition.

Table 1. Lockout Requirements.SEMITRAILER CENTER OF GRAVITY(CG) ON-ROAD OFF-ROAD

BELOW 65 in. (165 cm) HALF LOCK(3 Oscillation)

NO LOCK(6 Oscillation)

ABOVE 65 in. (165 cm) FULL LOCK(No Oscillation)

NO LOCK(6 Oscillation)

HALFLOCK

HALF LOCK

FULL LOCK

NO LOCKNO LOCK

FULL LOCK

Figure 1.

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6

5

8

7

2

3

4

4 9 10

1

Figure 2.

a. Remove four screws (1), lockwashers (2), cover plate (3), and lockring (4) fromfifth wheel (5).

b. Install lockring (4) so desired surface area (see Table 1 above) is orienteddirectly under engagement area (6) of fifth wheel (5) with cover plate (3), fourlockwashers (2) and screws (1).

c. Repeat Step (2) for opposite side of fifth wheel (5).

NOTE If lockout assembly is oriented correctly (refer to table 1), skip to Step

(4).

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Loosen and rotate lockring if NO LOCK position is desired, or if

desired lockring position (HALF LOCK or FULL LOCK) is located tothe inside (against the fifth wheel).

Both fifth wheel lockout assemblies are rotated the same way (driverside shown).

3. Rotate fifth wheel lockout assembly:

a. Loosen four screws (1).

NOTE

Driver side lockring rotates toward the rear of vehicle. Passenger side lockring rotates toward the front of vehicle.

b. Rotate lockring (4) so desired surface area (see table 1 above) is orienteddirectly under engagement area (6) of fifth wheel (5).

c. Tighten four screws (1).

d. Repeat Step (3) for opposite side of fifth wheel (5).

NOTE

Fifth wheel has two lock release handles.4. Pull fifth wheel secondary lock release handle (7) completely out as far as it will go.

5. Pull out fifth wheel primary lock release handle (8) and hook it in out position.

6. Push down rear of fifth wheel (5) until it rests on stop (9) below guide ramps (10).

CAUTION Ensure there is a generous amount of grease on fifth wheel, ramps,

kingpin, and steering wedge. Failure to comply may result in damageto equipment.

Tractor vehicle and semitrailer coupling should be performed with thetractor vehicle and semitrailer in a straight line. If wedge of trailer isnot aligned with tractor vehicle fifth wheel, adjust either tractorvehicle, trailer, or both to align them. Failure to comply may result indamage to equipment.

7. Prepare semitrailer for coupling (refer to TM 5-2330-378-14&P). (WP 0141)

8. Slowly back tractor vehicle (WP 0048) to within 3 ft. (.92 m) of semitrailer. Stop tractorvehicle.

9. Set transmission range selector (11) to N (neutral).

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WARNING





12. With aid of an assistant, pay out heavy-duty winch cable (14) over fifth wheel (5) andguide roller (15), and connect heavy-duty winch cable (14) to lifting eye (16) of

semitrailer.13. Ensure tractor vehicle does not have parking brake or service brakes engaged while

assistant reels in heavy-duty winch cable (9) and lifts semitrailer off ground.(WP 0037)

NOTEDashboard parking brake indicator will go out when PARKING BRAKEcontrol is released.

14. Push in PARKING BRAKE control (12).

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AIR BRAKE

EXEXEX

EXEXEX

EXEXEX

ENGINE

OFF

ON

START

TRAILER

AIR SUPPLY

PARKING

BRAKE

12

Figure 5.

WARNING

Ensure that no one is standing between vehicle and semitrailer duringcoupling procedure. Failure to comply may result in injury or death topersonnel.

CAUTIONEnsure tractor vehicle does not have parking brake or service brakesengaged while assistant reels in heavy-duty winch cable and liftssemitrailer off ground. Failure to comply may result in damage toequipment.

15. Reel in heavy-duty winch cable (14) until semitrailer gooseneck (17) is in maximumupright position. Operator allows semitrailer and tractor vehicle to roll together.

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17

1418

5

10

Figure 6.

CAUTIONDo not run kingpin up guide ramps to prevent damage to kingpin, guideramps, or fifth wheel.

NOTE As semitrailer contacts tractor vehicle, second assistant should

visually check that front of semitrailer is on guide ramps.

Tractor vehicle is equipped with fifth wheel to accept 3.5 in. (89 mm)kingpin.

16. Continue to reel in heavy-duty winch cable (14) as semitrailer moves up guide ramps(10), and semitrailer kingpin (18) locks in fifth wheel (5).

NOTEIf coupling is not secure, rock tractor vehicle back and forth slowly untilkingpin is locked in fifth wheel.

17. Verify semitrailer kingpin (18) is fully engaged and locked within fifth wheel (5).

NOTEDashboard parking brake indicator will illuminate when PARKINGBRAKE control is applied.

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18. Pull out PARKING BRAKE control (12).

AIR BRAKE

EXEXEX

EXEXEX

EXEXEX

ENGINE

OFF

ON

START

TRAILER

AIR SUPPLY

PARKING

BRAKE

12

Figure 7.

19. Ensure primary lock release handle (8) is pushed completely in.

8

Figure 8.

NOTE If semitrailer is M870, continue with Step (19).

If semitrailer is M870A1, skip to Step (20).

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20. Perform the following for a M870 semitrailer:

a. Install two lockpins (19), one on each side of semitrailer gooseneck (17).

17

21

M870

20

22

23

19

Figure 9.

b. Install two safety screws (20), nuts (21), safety locking pins (22), and safety clips(23) in lockpins (19).

NOTEIf semitrailer is M870A1, continue with Step (20).

21. Perform the following for a M870A1 semitrailer:

CAUTIONEnsure safety latches on locking pins lay flat against the frame ofsemitrailer and in holder. Failure to comply may result in damage toequipment.

a. Install two lockpins (19), one on each side of semitrailer gooseneck (17).

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M870A1

17

19

Figure 10.

22. Disconnect tractor vehicle air lines (24) from tree (25).

TM 9-2320-420-10 0038

Date post:	30-May-2018
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TM 9-2320-420-10 M983A2LET PART 3

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