2
Model 70160
Table of ContentsIntroduction ......................................................................................................... 2Identification ........................................................................................................ 3Tools Required .................................................................................................... 3Parts Drawing ...................................................................................................... 4 - 5Parts List ............................................................................................................. 6 - 7Repair information
Disassembly .................................................................................................. 8 - 10Reassembly ................................................................................................... 11 - 12
Fault - Logic Troubleshooting .............................................................................. 13 - 17Start-up Procedure .............................................................................................. 18
IntroductionThis manual provides service information for Eaton Models 70160 variable displacement piston pumps. Stepby step instructions for the complete disassembly, inspection, and reassembly of the pump are given. Thefollowing recommendations should be followed to insure successful repairs.
Remove the pump from the application.
Cleanliness is extremely important.
Clean the port areas thoroughly before disconnecting the hydraulic lines.
Plug the pump ports and cover the open hydraulic lines immediately after they're disconnected.
Drain the oil and clean the exterior of the pump before making repairs.
Wash all metal parts in clean solvent.
Use compressed air to dry the parts. Do not wipe them dry with paper towels or cloth.
Compressed air should be filtered and moisture free.
Always use new seals when reassembling hydraulic pumps.
Lubricate the new rubber seals with a petroleum jelly (Vaseline®) before installation.
Torque all bolts over gasketed joints, then repeat the torquing sequence to makeup for gasketcompression.
Verifying the accuracy of pump repairs on an authorized test stand is essential.
Introduction
3
Model 70160
Single Pump - Product Number:
7 0 1 6 0 - R A A - 02
Tandem Pumps - Product Number:
7 8 1 6 3 - R A B - 02
Serial Number Code:
A 99 01 31 JBTester's Initials
Day of Month (two digits)
Month (two digits)
Revision level of parts list.
Last two digits of year built.( 98 for 1998 etc.)
Identification Numbers - Manually Variable Displacement Piston PumpStamped on each unit's mounting flange.
A - Product Number Description70160 = Single Piston Pump78162 = Single Piston Pump with Gear Pump78161 = Tandem Piston Pumps78163 = Tandem Piston Pumps with Gear Pump
B - Sequential NumberingC - Engineering Design Code
A
A
B
B
Tools Required1/2, 9/16, 7/8 & 1-1/8 in. sockets and/or end
wrenchesTorque wrench (136 N.m [100 lbf.ft] capacity)Ratchet wrench5/16 in. and 7/16 Allen wrenches or bit socketsInternal and external retaining ring pliersSmall screwdrivers (2)Hammer (soft face)Light Petroleum JellySeal driver or similar tool
Each order must include the following information.1. Product and/or Part Number2. Serial Number Code3. Part Name4. Quantity
C
C
4
Model 70160
PartsDrawingPump drawn below is typical of a righthand rotation pump.
30
3-1Press Fit
6
5
4
1
Shaft assembly for rear pump of tandem.
Shaft assembly for single pump or front pump of tandem.
1
7
7
8
8
8
89
1010
910
10
11
11
29
48
12
24
41
16 Press Fit
23
17
17
14
3
5050-1
51
22 Press Fit
22 Press Fit
51-1
13
14
4039
41
Port(D2)
Port(D1)
39Press Fit into Cover plate
5
Model 70160
PartsDrawing
22-1 2-226
26
21
20
18
1919-1
1919-1
18
27
27
28
2837
37(K4-4)
2-1 2-226
26
21
20
18
19
19-1
1919-1
182
27A
27B
28A
55-149 55-2
55-355-4
49-155
55-5
37
35
36
55-1
55
55-2
55-355-4
55-5
4949-1
3434-1
32(K2-1)
K2-2
K2-3
32(K3-1)
31(K3-2)
33(K3-3)
K3
K2
32(K4-1)
K4-2
K4-3
K4
K1-1 32(K2-2)
K2-3
K2-4
K1
46
46
6
Model 70160
Item Qty. Description
1 1 Drive Shaft2 1 Endcover Assembly3 1 Housing Assembly4 1 Rotating Kit Assembly5 1 Swashplate6 1 Washer
+ 7 1 Retaining Ring+ 8 2 Retaining Ring
9 1 Thrust Bearing10 2 Bearing Race
+ 11 1 Shaft Seal, Drive11 1 Viton Shaft Seal, Drive11 1 Spacer
+ 12 1 Housing Gasket13 1 Swashplate Insert14 6 Washer
+ 16 1 Shaft Seal, Trunnion17 6 Screw, Cap18 2 Spring19 2 Plug Assembly
+ 19-1 2 O-ring, 2.38 mm Dia. x 22.23 mm ID. [.0937 in. Dia. x .875 in. ID.]20 1 Relief Valve for Port "C"21 1 Relief Valve for Port "D"22 2 Cone Bearing23 1 Coverplate Sub Assembly24 1 Coverplate Sub Assembly26 2 Dowel Pin27 2 Cap Screws, 5/16-18, 50.8 mm [2 in.] Long27A 2 Cap Screws, 5/16-18, 82.6 mm [3.25 in.] Long27B 2 Cap Screws, 5/16-18, 88.9 mm [3.5 in.] Long28 2 Cap Screws, 5/16-18, 63.5 mm [2.5 in.] Long28A 2 Cap Screws, 5/16-18, 95.3 mm [3.75 in.] Long28B 2 Cap Screws, 5/16-18, 101.6 mm [4.00 in.] Long29 1 Key, Drive Shaft30 1 Key, Tapered Arm31 1 Cover Plate (In K3 kit)
+ 32 1 O-ring (In K1, K2, K3, & K4 kit)33 2 Cap Screws, Cover Plate (In K3 kit)34 1 Plug Assembly
+ 34-1 1 O-ring, 2.21 mm Dia. x 16.36 mm ID. [.087 in. Dia. x .644 in. ID.]+ 35 1 Molded O-ring
36 1 Charge Pump Adaptor37 1 Gerotor set and coupler sub-assembly37 1 9 tooth coupler (In Kit 4)37 1 11 tooth coupler (In Kit 5)39 2 Cup, Bearing40 1 Ring, Crush41 2 O-ring, 2.38 mm Dia. x 66.68 mm I.D. [.0937 in. Dia. x 2.625 in. I.D.]42 4 Washer46 1 Mounting Bracket, Square shaped46 1 Mounting Bracket, "V" shaped
Parts List
7
Model 70160
Parts List
48 1 Valve PlateRighthand (CW) RotationLefthand (CCW) Rotation
49 1 Plug Assembly49-1 1 Plug Assembly
+ 50-1 1 O-ring, 1.98 mm Dia. x 11.89 mm ID. [.078 in. Dia. x .468 in. ID.]51 1 Plug Assembly
+ 51-1 1 O-ring, 1.98 mm Dia. x 11.89 mm ID. [.078 in. Dia. x .468 in. ID.]55 1 Bypass Valve sub-assembly
+ 55-1 1 Retaining Ring55-2 1 Separator Plug55-3 1 Separator
+ 55-4 1 O-ring, 1.59 mm Dia. x 9.53 mm I.D. [.0625 in. Dia. x .375 in. I.D.]+ 55-5 1 O-ring, 2.46 mm Dia. x 19.18 mm I.D. [.097 in. Dia. x .755 in. I.D.]
Mounting KitsK1 1 Tandem Piston Pump Mounting KitK1-1 1 35T Coupler, 36.8 mm [1.45 in.] longK1-2 1 O-ring, 1.59 mm Dia. x 101.6 mm ID. [.0625 in. Dia. x 4 in. ID.]K1-3 2 Cap ScrewsK1-4 2 WasherK2 1 Gear Pump Mounting KitK2-1 1 O-ring, 1.59 mm Dia. x 82.55 mm ID. [.0625 in. Dia. x 3.25 in. ID.]K2-2 2 WasherK2-3 2 Cap ScrewsK3 1 Cover Plate KitK3-1 1 O-ring, 1.59 mm Dia. x 82.55 mm ID. [.0625 in. Dia. x 3.25 in. ID.]K3-2 1 Cover PlateK3-3 2 Cap ScrewsK4 1 Gear Pump Mounting Kit with CouplerK4-1 1 O-ring, 1.59 mm Dia. x 101.6 mm ID. [.0625 in. Dia. x 4 in. ID.]K4-2 2 WasherK4-3 2 Cap ScrewsK4-4 1 9T Coupler
Seal Repair Kit• 1 Seal Repair Kit (see Parts Manual for part numbers)
Legend + Included in seal repair kit.
Item Qty. Description
8
Model 70160
DisassemblyThe following disassembly procedure applies to a single pump
with or without gear pump Therepair procedure for tandempumps, once they are separated, isbasically the same. The basicconfiguration differences betweena single and tandem pumps are theendcovers, pump shafts andhousing assemblies. In mostcases, only the rear pump of
tandem units contain a charge pump, which is common toboth the front and rear pump. The rear tandem pump does notincorporate a shaft seal.
Thoroughly clean the Eaton Model 70160 or 78162 variabledisplacement pump before anyrepairs are attempted. Whenworking on tandem pumps,separate the front and rear pumpsfirst.
1 Support the pump with theinput shaft down. Use a 1/2 in.socket or end wrench to removethe pump adapter cover plate orgear pump (see Figure 2).
2 Use a pick or similar tool toremove the adapter cover plate orgear pump o-ring. (See Figure 3)
3 Use a 7/16 in. Allen wrench orbit socket remover to remove thecharge pressure relief valve springretainer from the pump adaptorassembly (see Figure 4).
4 Use a pencil magnet or similartool to carefully remove the chargepressure spring and poppet fromthe pump adaptor assembly. (SeeFigure 5) Use caution not to dropthe charge pump poppet into thepump adaptor assembly.
5 The charge pressure reliefvalve and poppet may be of thestandard or high pressure type. The(6.9 to 10.3 bar [100 to 150 PSI])standard spring and poppet areshown on the bottom and theoptional high pressure (13.7 to20.7 bar [200 to 300 PSI]) springand poppet is shown on the top.
The same charge pressure relief valve spring retainer is usedwith either the standard or highpressure (see Figure 6).
6 Use a 7/8 in. socket or endwrench to remove the optionalbypass valve assembly from theendcover (see Figure 7).
7 The internal seal may bereplaced by first removing thesmall retaining ring on the end ofthe bypass valve. Remove andreplace the o-rings (see Figure 8).
8 Use a 1-1/8 in. socket or endwrench to remove the two highpressure relief valves from thepumps endcover assembly (seeFigure 9). Remove plug, spring, andrelief valve as shown from eachside (see Figure 10). Each systemrelief valve assembly is identified byboth its part number and relief valve setting as shown in PartsInformation manual.
9 Firmly support the pump assembly. Use a 1/2 in. socket orend wrench to remove the four cap screws retaining the chargepump adapter assembly.
10 With the cap screws removed,remove the charge pump adaptorassembly from the endcover (seeFigure 11).
Note: The front pump assembliesdo not have charge pump adapterassemblies.
11 Turn the adapter assemblyover. Use an o-ring pick or similartool remove the o-ring seal (seeFigure 12).
12 Inspect the gerotor pocket andneedle bearing located in thecharge pump adapter. The needles in the needle bearing mustremain intact in the bearing cage.
Repair Information - Disassembly
Figure 1
Figure 2
Figure 3
Figure 5
Figure 4
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
9
Model 70160
13 When the needle bearingassembly is replaced, thenumbered end of the bearing mustface toward the flange side of theadapter to the dimension as shown(see Figure 13).
14 With the charge pump adapterremoved, remove the charge pumpouterring and inner gerotor ringassembly (see Figure 14 and 15).
15 Charge pumps are available intwo different displacements Chargepump displacements are based onthe thickness of the gerotorassembly and the depth of thepocket located in the charge pump adapter. To determine thedisplacement, refer to the table below.
Gerotor Pocket DepthDisplacement Depth of Pocketcm3/r [in3/r] mm [in.]
6.9 [.42] 6.35 [.25]13.8 [.84] 12.7 [.50]
16 To separate the endcoverassembly from the dowel pins inthe pump housing assembly, inserttwo screwdrivers betweenendcover and housing assemblyand pry upward (see Figure 16).
17 After separation, remove theendcover from the housingassembly.
18 Turn the endcover assemblyover and inspect the needlebearing. The needles in the needlebearing must remain intact in thebearing cage (see Figure 17).
19 When the needle bearingassembly is replaced, thenumbered end of the bearing mustface the valve plate side of theendcover to the dimension asshown (see Figure 18).
20 With the endcover removed,remove the gasket from the pumphousing assembly and discard (seeFigure 19).
21 Remove the valve plate from the piston block assembly.Note: This valve plate may have stuck to the endcoverassembly that was previously removed.
22 Valveplate directional rotation (CW or CCW) is identifiedby the location of the metering slots located on the face of thevalve plates. Pump inputrotation should always turninto the metering slots (seeFigure 20). A clockwisevalve plate is shown on theleft and a counter clockwisevalveplate is on the right.Note: Whenever pumpinput rotation is changed, the valve plate must be replacedalong with the desired rotation charge pump adapter.
23 Remove the rotating kit assemblyby carefully retaining it in the housingassembly (see Figure 21). Lift thehousing and rotating kit assembly andturn over assemblies allowing therotating kit assembly to slide down theinput shaft and out of the pumphousing.
24 With the rotating kitassembly removed, remove thepiston assemblies, spider andspider pivot from the pistonbarrel.(see Figure 22).
25 Inspect the pistonassemblies, spider, spider pivotand piston block. The piston block assembly usually requiresno further disassembly unless the pins or block spring aredamaged.
26 When any excessive wear orscratches are noted on the face ofthe piston block, the blockassembly must be replaced (seeFigure 23).
DO NOT LAP THE FACE OF PISTONBLOCK ASSEMBLY.
27 To remove the input shaftassembly, use a pair of internalsnap ring pliers and remove theshaft seal retaining ring from thehousing assembly (see Figure 24).
Numbered End
Gerotor Pocket
2.41 mm[.095 in.]
Flange
Figure 13
Figure 17
2.79 mm[.110 in.]
1.91 mm[.075 in.]
Numbered End
Figure 18
Figure 20
Figure 22
Figure 23
Figure 24
Figure 15
Figure 16
Figure 14
Figure 19
Figure 21
Repair Information - Disassembly
10
Model 70160
28 With the retaining ringremoved, use a small press topress the shaft seal and input shaftassembly from the housingassembly.
29 With the input shaft assemblyremoved, disassemble theassembly for inspection byremoving the shaft seal, washer,retaining ring thrust washers andbearing (see Figure 26).
Note: The rear pump on tandemunits uses a spacer in place ofshaft seals.
30 To remove the swashplatefrom the housing assembly, use a9/16 in. socket or end wrench andremove the three cap screwsretaining the control arm cover plate assembly. Start at thecover plate with control arm. (see Figure 27).
31 With the retaining cap screws removed, insert two smallscrewdrivers in the notches locatedin the cover plate assembly and pryupward. Make sure bearing cupcomes off with the cover plate (seeFigure 28).
Note: The crush ring in the controlarm trunnion cover does not needto be removed (see Figure 29). Theonly time the crush ring needs tobe removed is when either thetrunnion cover, the swashplateassembly or the housing assemblyis replaced. A shim kit is thenrequired in the crush rings place.
32 Reposition the pump assemblyto remove opposite cover plate.The bearing cup in this cover plateis press fit and not removable.Repeat steps 30 through 31.
33 To remove swashplate, firstuse a small press and press thedrive shaft needle bearing out ofthe housing.
34 With housing in the upright position rotate the swashplateupside down, slide the swashplate toward the control side andlift it from the pump housing (see Figure 30).
Note: The swashplate control shaft will fit out either side of the
pump housing. Be sure to note on which side of the housingthe control shaft protrudes before removing swashplate fromhousing for correct reassembly orientation.
35 Use an o-ring pick or similar tool to remove the o-ringseals from the two counter-boresin the housing or the cover plates(see Figure 31).
36 To remove the control sidecover plate lip seal, use a smallpress and press the lip seal inward(see Figure 32).
37 Remove the thrust plate fromthe swashplate. The thrust plate isreversible and either side may facethe swashplate (see Figure 33).
38 When the needle bearing isreplaced, the numbered end of theneedle bearing must face awayfrom the housing and pressed tothe dimension as shown (seeFigure 35).
Figure 26
Figure 27
Repair Information - Disassembly
Figure 32
Figure 34
1.78 mm[.07 in.]
Numbered EndFlange End of Housing
Figure 35
Figure 25
Figure 28
Figure 29
Figure 30
Figure 33
Figure 31
11
Model 70160
Reassembly1 Before reassembling the pump, replace all worn anddamaged parts, assemblies, seals and o-rings. Lubricate theseals and o-rings with petroleum jelly to help retain themduring reassembly and to provide lubrication to the input andcontrol shaft seals. Lubricate all finished part surfaces freelywith clean hydraulic fluid to help provide start up lubricationbetween all rotating parts.
2 To reassemble the swashplateassembly into the pump housing,tilt the swashplate slightly andinstall the control side of theswashplate through the previouslynoted or marked side of thehousing assembly (see Figure 36).
3 With the swashplate installed,lubricate the tapered bearing on thenon-control arm side of theswashplate (see Figure 37).
4 Lubricate and install the o-ringseal into counter-bore of housing(see Figure 37).
5 Install the trunnion cover overbearing and onto pump housing.Install the three cap screws andtorque to 39,3 Nm [29 ft. lbs.] (seeFigure 38).
6 Lubricate and install thecontrol arm shaft seal into thecontrol arm cover plate. Install with the lip of the seal facingupward or to the inside of the pump (see Figure 39).
7 If the housing, trunnion covers or swashplate assemblyhave not been replaced, the existing crush ring may be re-used. If you have replaced anyone of the above a shim kit mustreplace the crush ring. See Parts Information manual fornumber.
8 Place the bearing cup into trunnion cover over the crush
ring or shims (see Figure 40).
9 Lubricate and install the o-ringseal into counter-bore of housing(see Figure 41).
10 Install the trunnion cover overthe control shaft and into the pumphousing. Install the three retainingcap screws and torque to 39,3 Nm[29 ft. lbs.] (see Figure 42).
11 Using your fingers, tilt theswashplate back and forth to checkthe trunnion bearing preload.Proper preload is achieved whenthe swashplate has a very slighttilting resistance. The swashplatemust not have any or very little sideclearance.
12 Reassemble the input shaftassembly by installing the thrustwasher, thrust bearing, secondthrust washer, retaining ring,washer and shaft seal (see Figure43).
Note: The lip of the shaft seal mustpoint toward the center of the inputshaft.
13 Install the input shaftassembly into the housingassembly. Push the shaft seal injust far enough so you can start theshaft seal retaining ring.
14 Use a pair of snap ring pliersto install retaining snap ring intothe housing assembly (see Figure44).
15 Use a seal driver or similartool to press or drive the snap ringand seal into the housing assembly(see Figure 45).
CAUTION! Press or drive inwarduntil the snap ring snaps into thesnap ring groove located in thepump housing assembly.
16 The thrust plate is reversible.Either side will fit into the
Figure 38
Figure 42
Figure 43
Figure 44
Figure 45
Repair Information - Reassembly
Figure 36
Figure 37
Figure 39 Figure 40
Figure 41
Figure 46
12
Model 70160
swashplate. In most cases if anyirregularities are noted it is best toreplace the thrust plate (see Figure46).
18 Lubricate and install thethrustplate over the input shaftassembly and into the swashplate.The thrustplate must rest firmly inits pocket located in the swashplate.
19 Reassemble the rotating kitassembly by first aligning thesplines in the pivot with the splinesin the block. Install the pivot on theblock assembly pins (see Figure47).
20 Use a small socket or similartool to help retain the pivot in thecentered position. Lubricate andinstall the spider and pistonassemblies onto the pivot andpistons into the piston blockassembly (see Figure 48).
21 Hold the housing assembly inthe vertical position then carefullyinstall the rotating kit by firstaligning with the splines on theinput shaft. With splines aligned,install the rotating kit into thepump housing (see Figure 50). Usecaution to ensure all parts are keptin their proper position.
22 With the rotating kit installed,reposition the housing assembly inthe input shaft down position andinstall a new housing gasket (seeFigure 50).
23 Lightly coat the endcover sideof the valve plate with petroleumjelly for retention during assembly.Install the valve plate over theneedle bearing, aligning the smallslot on the outside of the valveplate with the dowel pin in theendcover (see Figure 51).
24 Carefully install the endcoverassembly by aligning it with thedowel pins located in the pumphousing. Use caution not todislodge the valve plate (see Figure54).
25 Align the spline of the gerotor’s inner ring, then lubricateand install the inner ring and outerring over the input shaft and ontothe endcover assembly (see Figure53).
Note: Before installing the chargepump adaptor plate, offset the outerring of the geroter as shown.
26 With the gerotor assemblyinstalled, install new o-ring intocharge pump adapter plate andplace adapter onto endcover overgerotor. Retain with cap screws.Torque cap screws to 25 N•m [18.5lbf•ft] (see Figure 54).
27 Install the two high pressurerelief valves. Torque valves 128,8 to142,4 N•m [95 to105 lbf•ft] (seeFigure 55).
29 Lubricate and reassemble thebypass valve assembly. Install thebypass valve into the endcover.Torque valve to 30,5±2 N•m[22.5±1.5 lbf•ft] (see Figure 56).
30 Coat the charge pressurepoppet with petroleum jelly andplace poppet onto spring and installinto the adapter plate (see Figure57).
31 Install the hollow chargepressure relief valve retainer intothe adapter plate. Torque retainer to 6,8 to 9,5 Nm [5 to 7lbf•ft].
32 Lubricate and install the o-ring on the cover plate or gearpump. Install the cover plate or gear pump and two capscrews. Torque cap screws to 36,6 to 40 Nm [27 to 31 lbf•ft].
The Model 70160 or 78162 variable displacement pump is nowready for test and reinstallation.
Figure 48
Figure 49
Figure 51
Figure 54
Figure 55
Figure 56
Figure 57
Repair Information - Reassembly
Figure 47
Figure 50
Figure 52
Figure 53
13
Model 70160
1
Inspect?
Repairor
Replace
Defective
ActionStep
CommentNumber
Decision
Solution
Symptom:
Gauges RecommendedInlet vacuum gauge: 2 bar to 1 bar [30 PSI to 30 inHg]System pressure gauge: 700 bar [10,000 PSI]Charge pressure gauge: 0 to 50 bar [0 to 600 PSI]Case pressure gauge: 0 to 25 bar [0 to 300 PSI]
ExplanatoryDiagram
This fault - logic troubleshooting guide is adiagnostic aid in locating transmission problems.
Match the transmission symptoms with the problemstatements and follow the action steps shown in thebox diagrams. This will provide help in correctingminor problems eliminating unnecessary machinedown time.
Following the fault - logic diagrams are diagramaction comments of the action steps shown in thediagrams. Where applicable, the comment number ofthe statement appears in the action block of thediagrams.
Recommended Gauge Locations
Figure 58
Pressure PortsTee In Line to CheckSystem Pressure
Charge Pump Suction PortTee In Line to Check InletVacuum
Drain PortTee In Line to CheckCase Pressure
Auxiliary PortCheck Charge Pressure
Fault - Logic Troubleshooting
Bypass ValveLocation
14
Model 70160
Fault - Logic Troubleshooting
InspectServo Control
(If used)OK
1 2
InspectExternal Control
Linkage
Defective
Repairor
Replace
Defective
Repairor
Replace
Symptom: Neutral Difficult or Impossible to Find
InspectHeat
ExchangerOKOK OK
4 5 6
CheckOil Level inReservoir
Fill toProperLevel
DefectiveBelow Level
Repairor
Replace
CheckSystem
Pressure
ReduceSystemLoad
High
OK9
InspectCharge Relief
ValveOK
11
InspectChargePump 13
InspectMotor
12
InspectInlet Screen
or Filter
Replace
Clogged
OK8
CheckCharge
Pressure10
Low OK
OK
ReplacePump &Motor
Inspect PumpBypass Valve
(If used)OK
7
Inspect HeatExchanger
Bypass Valve(If used)
OK
Defective
Repairor
Replace
Defective
Repairor
Replace
Defective
Repairor
Replace
Defective
Repairor
Replace
Defective
Repairor
Replace
Symptom: System Operating Hot
15
Model 70160
InspectServo Control
(If used)OK OK
1 2 3
InspectExternal Control
Linkage
Defective
Repairor
Replace
InspectSystem Relief
Valves
Defective
Repairor
Replace
Defective
Repairor
Replace
Symptom: Operates in One Direction Only
InspectServo Control
(If used)OKOK OK
2 7
Defective
Repairor
Replace
InspectMotor
12
Replace
Clogged
CheckCharge
Pressure10
Low OK
Inspect PumpBypass Valve
(If used)
ReplacePump &Motor
Defective
Repairor
Replace
InspectInlet Screen
or FilterOKOK OK
8 13
Defective
Repairor
Replace
InspectCharge Relief
Valve11
InspectChargePump
Defective
Repairor
Replace
Defective
Repairor
Replace
Symptom: System Response Sluggish
Fault - Logic Troubleshooting
16
Model 70160
Check ExternalControlLinkage
OKOK OK4 1 7
CheckOil Level inReservoir
Fill toProperLevel
DefectiveBelow Level
Repairor
Replace
CheckSystem
PressureOK
9
InspectCharge Relief
ValveOK
11
InspectChargePump 13
InspectMotor
12
InspectInlet Screen
or Filter
Replace
Clogged
OK8
CheckCharge
Pressure10
Low OK
OK
ReplacePump &Motor
InspectServo Control
(If used)OK
2
Inspect PumpBypass Valve
(If used)
OK
Defective
Repairor
Replace
Defective
Repairor
Replace
Defective
Repairor
Replace
Defective
Repairor
Replace
Defective
Repairor
Replace
High
ReduceSystemLoad
Symptom: System Will Not Operate In Either Direction
Fault - Logic Troubleshooting
17
Model 70160
Diagram Action Step Comments
1 Inspect External Control Linkage for:a. misadjustment or disconnectionb. binding, bending or breakagec. misadjusted, damaged or broken neutral return spring
2 Inspect Servo Control Valve for: (if used)a. proper inlet pressureb. misadjusted, damaged or broken neutral return springc. galled or stuck control spoold. galled or stuck servo piston
3 Inspect System Relief Valves* for:a. improper pressure relief settingb. damaged or broken springc. valve held off seatd. damaged valve seat
4 Check Oil Level in Reservoir:a. consult owner/operators manual for the proper type
fluid and level
5 Inspect Heat Exchanger for:a. obstructed air flow (air cooled)b. obstructed water flow (water cooled)c. improper plumbing (inlet to outlet)d. obstructed fluid flow
6 Inspect Heat Exchanger Bypass Valve for: (if used)a. improper pressure adjustmentb. stuck or broken valve
7 Inspect Pump Bypass Valve for: (if used)a. held in a partial or full open position
8 Inspect Inlet Screen or Filter for:a. plugged or clogged screen or filter elementb. obstructed inlet or outletc. open inlet to charge pump
9 Check System Pressure:a. See figure 60 for location of pressure gauge installation.b. consult owner/operators manual for maximum system
relief valve settings
10 Check Charge Pressure:a. See figure 60 for location of pressure gauge installation.b. consult owner/operators manual for maximum charge
relief valve settings
11 Inspect Charge Relief Valve for:a. improper charge relief pressure setting *b. damaged or broken springc. poppet valve held off seat
12 Inspect Motor for:a. disconnected coupling
13 Inspect Charge Pump for:a. broken or missing drive keyb. damaged or missing o-ringc. excessive gerotor clearanced. galled or broken gerotor set
* System/Charge Relief Valve Pressure Settings for Eaton’sVariable Displacement Controlled Piston Pumps
Inlet Vacuum 6 inHg max.Case Pressure 25 PSI maximumCharge Pressure 100 to 150 PSI Standard
200 to 250 PSI Optional250 to 300 PSI Optional
System Pressure 5000 PSI maximum3000 PSI continuous
The high pressure relief valves are all factory preset andcannot be readjusted.
The pressure setting and assembly number is stamped oneach high pressure relief valve cartridge.
Valve Identification Example:
32060-IA 5000
Relief Valve Setting
Relief Valve Assembly Number
Fault - Logic Troubleshooting
18
Model 70160
When starting a new or rebuilt transmission system, it isextremely important to follow the start-up procedure. Itprevents the chance of damaging the unit which might occur ifthe system was not properly purged of air before start-up.
1 After the transmission components have been properlyinstalled, fill the pump housing at least half full with filteredsystem oil. Connect all hydraulic lines and check to be surethey are tight.
2 Install and adjust all control linkage.
3 Fill the reservoir with an approved oil that has been filteredthrough a 10 micron filter. Refer to Eaton HydraulicsTechnical Data Sheet number 3-401 titled Hydraulic FluidRecommendations.
4 For Gasoline engines or L.P. engines remove the coil wireand turn the engine over for 15 seconds. For Diesel enginesshut off the fuel flow to the injectors and turn the engineover for 15 seconds.
5 Replace the coil wire or return the fuel flow to the injectors.Place the transmission unit in the neutral position, start theengine and run it at a low idle. The charge pump shouldimmediately pick up oil and fill the system. If there is noindication of fill in 30 seconds, stop the engine anddetermine the cause.
6 After the system starts to show signs of fill, slowly movepump swashplate to a slight angle. Continue to operatesystem slowly with no load on motors until systemresponds fully.
7 Check fluid level in the reservoir and refill if necessary tothe proper level with an approved filtered oil.
8 Check all line connections for leaks and tighten ifnecessary.
The machine is now ready to be put into operation.
Frequent filter changes are recommended for the first twochanges after placing the machine back into operation. Changethe first filter in 3-5 hours and the second in approximately 50hours. Routinely scheduled filter changes are recommendedfor maximum life of the hydraulic system.
Start-up Procedure
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Model 70160