HoneywellWP23 1

AIR COMPRESSORS

GENERAL

The WP231 Air Compressors are used to provide andmaintain the air pressure source for pneumatic comfortcontrol systems. If a remote tank is required, the com-pressor is attached to a mounting base.

See Table 1.

OPERATION

Air is drawn in through the intake filter, compressed,and stored in the tank. When the tank pressure increasesto the cutout setting of the pressure switch, the com-pressor stops.

As the air is consumed by the system and the tankpressure is reduced to cut in pressure, the compressormotor energizes and restores the tank pressure in thetank to the cutout pressure.

MAINTENANCE

SCHEDULE

WEEKLY

1. Check oil level (and pressure on 1 hp and larger).

2. Drain water from tank or check automatic drain.

3. Check tank and prv pressure.

4. Observe operation; ascertain that pump does buildup to cutout pressure and shut off.

Rev. 8-79

EVERY THREE MONTHS (In Addition to WeeklyMaintenance)

1. Change oil.

2. Check intake filter.

3. Drain water from tank.

4. Check belt tension and condition.

5. Check sequential operation.

6. Check safety.

7. Check filter cartridge.

Commerc ia l DIV

MLF TAB: II. C. 9.

Tabl

e 1.

Spec

ifica

tions

fo

r W

P23

I Ta

nk

Mou

nted

Ai

r Co

mpr

esso

rs.

Hon

eyw

ell N

o.

WP2

31Y

W

P231

B

WP

23

1C

WP2

31D

W

P231

E

WP2

31F

WP2

31G

W

P231

H W

P231

J W

P231

K W

P23

1L

WP2

3IM

Qui

ncy

Mod

el N

o.FH

X2

i HA

4 FM

1 0

8 FH

210

F H

216

FH23

0 FH

325

FH34

0 F

H390

FH

5 10

5 F

H51

20

FH5

120

Mo

del

. C

om

pre

sso

r O

nly

X2

Pla

inA

4 Pl

ain

108

Loa

dles

s2

10 L

oadl

ess

216

Loa

dles

s23

0 Lo

adle

ss32

5 L

oadl

ess

340

Loa

dles

s39

0 L

oadl

ess

5 10

5 L

oadl

ess

5120

Loa

dles

s51

20

Loa

dles

s

Hor

se

Pow

er/M

otor

fr

ame

l/

3 -

48

l/2 5

6

3/4 -

561

- 143

T1/

12 -

145T

2 -

145T

3 1

82

T-

5 18

4T-

7-1/

2 21

3T

10

215

T-

15

254T

-2

0 2

56T

-

Bor

e &

St

roke

2

x 1-

3/4

2-l/2

X 2

-l/2

3 X

2-1/

22-

1/2

x 2

3 2-

l/2x

3-l/2

3

X4-

l/2

2-l/2

&

x3

5-l/4

3-

l/2&

3 x

7-1/

2&

4 x

46

&

x3-

1/4

3-

l/26

&

x 4

3-l/4

6 &

x

43-

l/4

No.

of

C

ylin

ders

1

11

22

22

22

44

4

RPM

-

Com

pres

sor

500

400

460

480

460

400

570

550

450

530

710

870

Dis

plac

emen

t ft

3 /m

in

(P/m

)

1.6

(45)

2.8

(79)

4.7

(133

)5.

4 (1

53)

9.5

(269

)13

.3 (

377)

16 0

(45

3)24

3(6

88)

46 0

(130

3)61

.0(1

727)

93.0

(2

633)

114

0 (3

228)

Del

. - f

t3/m

(K

/m)

at 7

0/90

lb/in

2 (4

80/6

20

kPa)

1.

1 (3

1)1.

7 (4

8)3

3 (9

3)3.

8 (1

08)

5.9

(167

),

8 6

(244

)12

.6 (

357)

19 3

(54

7)36

.6 (

1036

)47

.0

(133

1)72

.5

(205

3)89

.0

(252

5)

Tan

k Si

ze

- G

al.

(Lit

ers)

20

(7

6)20

(76

)30

(11

4)30

(114

)60

(228

)60

(22

8)60

(22

8)80

(30

4)12

0 (4

56)

120

(456

)12

0 (4

56)

120

(456

)

Cut

-In

Pres

sure

-

lb/in

2

(kPa)

70

(4

80)

E--70

(48

0)60

(41

5)+

-60

(415

)

Cut

-Out

Pre

ssur

e -

lb/in

2 (k

Pa)

90

(620

)+

90 (

620)

100

(690

)t

100

(690

)

Inta

ke S

ize

- N

PT

- Com

pres

sor

l/41/

23/

41/

23/

4l-

l/41

1-1/

22-

l/22

22

Out

let

Size

-

NP

T

- Com

pres

sor

l/41/

23/

41/

23/

41-

1/4

1/4

l-1/

4l-1

/22

22

Flyw

heel

O

D

1011

.62

1412

1416

1619

.523

.523

.523

.523

.5

V-B

elts

- Q

uan.

- T

ype

- Len

gth

l-A

-46”

l-B

-5 1

”l-

B-6

0”l-

B-5

4”l-

B-6

0”2-

B-6

8”2-

B-6

8”3-

B-8

1”3-

B-1

05”

4-B

. 11

2”4-

B-1

20”

4-B

-120

”

Mot

or P

ulle

y P.

D.

- Pi

tch

Dia

. 2.

82.

53.

63.

23.

63.

65.

16.

06.

07.

09.

411

.5

Saf

ety

Val

ve -

Rec

eive

rl/4

NP

Tl/4

NP

TL

1/4N

PTl/4

N

PTl/4

NP

Tl/4

NP

Tl/2

NP

T3/

4 N

PT

3/4

NPT

3/4

NP

T3/

4 N

PT

Air

Filte

r (E

lem

ent

Onl

y)H

oney

wel

lA

K38

95-4

+-

7069

i;\

7070

A70

72∆3

7071

A70

71A

7071

A

Cra

nkca

se C

apac

ity

- Oil

4 oz

. (1

18 r

nK28

oz.

(82

8 mp

) 2

8 oz

. (8

28 m

!?) 2

2 oz

. (6

51 I

n!?)

48 o

z. (

1419

m’l

) 2

qts (2

V)

2 qt

s (2

V)6

qts

(5-l

/2 ‘?,

8 qt

a (7

-l/2

V)10

-l/2

qts

(10

v,

10-1

/2 q

ts (

10

V) 1

0-l/2

qts

(10

e,

Part

s L

ist

- Q

uinc

y x2

A4

108

210

216

230

325

340

390

5105

5120

5120

∆1

Pum

p-U

p T

ime

0 to

90

lb/in

2

(0

to

620

kPa)

14

min

. 9

min

.

7

min

./40

sec

6 m

in./4

5 se

c 8

min

.

5 m

in./4

5 sec

4

min

. 3

mm

./45

sec

3

min

./20

sec

2 m

in.1

24 s

ec

1 m

m./3

5 se

c 1

min

./25

sec

A 2

Pum

p-U

p T

ime

- 70

to

90lb

/in2

(480

to

62

0 kP

a)

3

min

./24s

ec

2 m

in./l

5sec

1 m

m./5

0se

c

1

min

./35s

ec

2 m

in./l

0sec

1

min

./40s

ec

1 m

in./l

0sec

1

min

. 1

min

./30s

ec

1 m

in./l

0se

c 1

mi

n.

50

sec

Lub

rica

tion

sys

tem

Sp

lash

Sp

lash

Sp

lash

P

ress

ure

Pum

p P

ress

ure

Pum

p P

ress

ure

Pum

p Pr

essu

re

Pum

p P

ress

ure

Pum

p

P

ress

ure

Pum

p Pr

essu

re P

ump

Pre

ssur

e P

ump

Pre

ssur

e P

ump

∆3 U

nloa

der

Dev

ice

Non

eN

one

3444

7970

x79

70x

7970

x79

70x

7970

X79

70x

7970

x79

70x

7970

x

∆3 U

nloa

der

(Val

ve)

5093

50

93

7483

X

8125

74

83X

74

83X

74

83X

74

83X

74

83X

74

83X

74

83X

74

83X

Che

ck V

alve

8405

8405

Non

eNO

IlCN

one

Non

eN

one

Non

eN

one

Non

eN

one

Non

e

∆1

0 to

60

lb/in

2 (0

to

414

kPa)

on

7-l/2

to

20 h

p un

its

∆ 2

60 t

o 10

0 lb

/in2

(41

4 to

690

kPa

) on

7-l

/2to

20 h

p un

its

∆3

Qui

ncy

Par

t N

umbe

r

EVERY YEAR (In Addition to Weekly and Three-onth Maintenance

1. Change oil.

2. Change intake filter.*

3. Change prv filter. *

4. Lubricate motor.

*Dirty operating environment may require the perform-ance of these items more often. The three-month checkswill uncover any need for more frequent replacement.

Quincy units use splash lubrication on the l/3 to 3/4hp units and pressurized lubrication on 1 hp units andlarger. To check oil level, a dipstick is provided on allsizes. Stop the pump, remove and wipe off dipstick, rein-stall it, then remove for reading. If oil is necessary, it isadded through the dipstick port. Use oil in accordancewith Table 2. Any nondetergent automotive oil is satis-factory but heavy-duty grade is preferred.

In addition to checking oil level, on 1 hp units andlarger, check the oil pressure on the gage. It should be inthe 10 to 20 lb/in2 (70 to 140 kPa) range,

To change oil, stop unit (it is a good idea to hang awarning on the control switch to prevent accidentalstarting without oil), remove the drain plug and dipstickand allow oil to drain completely. Replace plug and refillaccording to Table 2. DO NOT OVERFILL! This causesexcessive oil consumption and contamination of thecompressed air. Ordinarily, the crankcase need not beflushed; however, if it is felt necessary, use a nonflam-mable solvent. (Most auto parts stores carry some.)

Lubricate motor annually in accordance with instruc-tions on nameplate.

Table 2. Compressor Oil Requirements.

Compressor Ambient

Below 0F (-18C)

0 to 32F (-18 to 0C)

32 to 80F (0 to 27C)

Above 80F (27C)

SAE Viscosity Oil(Nondetergent)

SAE 5W

SAE 1OW

SAE 20

SAE 30

AlNlN~ TANK

Drain the tank by opening the drain cock. (This islocated in the middle of the tank at one end.) Allow afew seconds to purge the tank. The frequency of tankdraining depends upon climatic conditions, but weeklydraining is the minimum requirement . In humid climates,daily draining may be necessary. Consider adding theHoneywell AK3485 automatic drain kit.

AIR INTAKE FILTER

The air filter on l/3 to 2 hp compressors should bevisually checked periodically for build-up of foreignmaterial. A dirty filter will cause excessive oil consump-tion and should be replaced with a new filter.

The 3 hp and larger units use the Quincy Air Mazefilter silencer which can be checked by removing thefilter from the unit and holding a strong light against theintake openings. The light should be visible when observ-ing from the inside of the filter. The filter is washableand can be cleaned in solvent (preferably nonflammable)or in warm soapy water.

CHANGING FILTER CARTRIDGE

To change a filter in the 7-l/2 to 20 hp range, referto Figure 1. Shut off air to filter (Valve A) and bleeddown housing by manually operating drain trap (B).Remove wing nut and clamp ring (C) from housing andremove housing and automatic drain. Remove knurlednut at bottom of filter and replace filter, Reassemble,taking care that “O” ring seal on bottom side of coverhas not been disturbed. Turn on air slowly, checking forleaks.

SAFETY RELIEF VALVES

Safety relief valves are factory set to approximately15 lb/in2 (105 kPa) higher than the rated pressure of thecompressor. Check each safety relief valve by pulling onthe ring to unseat it. MALFUNCTIONING VALVESSHOULD BE REPLACED OR REPAIRED IMMEDI-ATELY. Safety relief valves are located next to the pres-sure switch or on the tank.

75-7267

5703

Fig. 1. Changing Filter Cartridge.

BELTS (See Fig. 2)

Hand pressure depresses the belt about l/2 inch (13mm). The belt should be tight enough to prevent slippingbut no further. Adjust tension by loosening the motorhold-down bolts, moving the motor until tension iscorrect, then retightening the bolts. Insure that belt andpulleys are aligned .

PRESSURES

During the weekly checks, verify that the tank pres-sure is in the proper range and the prv pressure at theproper setting.

H A N D P R E S S U R E

P U M P\

1/2" (13mm) APPRXF L Y W H E E L I

M O T O RP U L L E Y

Fig. 2. Checking Belt Tension.

OPERATION

As a weekly operational check, it is sufficient to con-firm that the compressor does have an “off” period andis not running continuously.

Every three months, the cut-in pressure, pump-uptime, cut-out pressure, and off-time should be measured.It should be below 50 percent operation (more off-timethan on-time) and operate approximately from 70 to 90lb/in2 (480 to 620 kPa) on the l/3 to 5 hp units and 60to 100 lb/in2 (4 15 to 690 kPa) on the 7-l/2 to 20 hpunits .

A good maintenance practice is to keep these figuresfor reference (a card attached to the unit is handy).Decreasing off periods (with no change in pressure range)indicate an increase in air comsumption and is alwayswith an increasing pump up time. This could be due toadded devices or leaks. Increasing pump up time with nochange in the pressure range or off time indicates wear inthe compressor and may warrant closer observation as itis usually followed by an increase in oil consumption.

If there is a suspicion of wear, the dead ended pump-up time (pumping up tank with the system shut off)should be checked against the value given in the datatable. If it differs from the table by more than 10 percent,then an analysis of the cause should be made as stated inWON’T PUMP AIR section, and the proper action taken.

TROUBLESHOOTING

This section attempts to minimize the time requiredto isolate the most common complaints and pinpoint themost common causes for them. Honeywell ApplicationsEngineering (Arlington Heights) would appreciate hearingof any problems encountered and not listed. These willbe considered for future editions of this sheet.

WRONG OIL PRESSURE (1 HP and UP)

Oil pressure in the 10 to 20 lb/in2 (69 to 138 kPa)range is normal. The recommended operating pressure is15 lb/in2 (103 kPa). There should be no pressure duringthe “off” cycle. Refer to Fig. 3.

Check oil level and clean oil intake filter before ad-justing pressure. The oil pressure is regulated by a spring-loaded ball mounted in the bearing carrier or in thecrankcase near the bearing carrier. This is on the sameside as the dipstick. Spring pressure is controlled by anadjusting screw. Turning the screw inward will increasethe pressure. Be sure to loosen the adjustment lock nutbefore making any adjustment, and turn adjustmentscrew slowly until the oil gage registers approximately15 lb/in2 (103 kPa). After adjustment has been made,tighten the adjustment screw lock nut.

74-7267

DIPSTICK OIL PRESSURE ROTATION OF FLYWHEEL

\.( ,,, \r~~~~~~~R~~~‘~~,TS

DRAIN PLUG p OIL INTAKE FILTER (1 TO 3 HP ONLY)MAY BE REMOVED FOR CLEANINGAND INSPECTION OF CRANKCASEACCUMULATION

5705

Fig. 3. Crankcase End View (1 HP Model).

If you are unable to get sufficient oil pressure, checkthe operation of the oil pump and pressure gage by un-screwing the pressure gage until oil seeps around thethreads when the compressor is running. This indicatesthat oil pressure is reaching the system, and also indicateswhether the pressure gage is operating. (The units requireoil pressure to operate intake valve unloaders and allowthe unit to pump. Lack of pumping ability is a goodindication of Poss of oil pressure.) If no oil appears at thethreads of the oil gage, this is an indication of possibleoil pump failure. If oil appears at the threads of the gage,and the oil pressure gage indicates no pressure, suspectthat the oil gage may be faulty and replace.

If the gage is ok, then the oil pump must be replaced.See OIL PUMP REPLACEMENT section for removaland repair of oil pump housing. In cases of low (not zero)pressure, the cause may be excessive wear in the pumpingunit. Pump up time should be checked against the tableand listen for unusual knocks indicating worn bearings.

OIL LEAKS

Oil leaks usually occur around screws and gaskets andusually can be corrected by tightening the screw involvedor replacing the gasket.

If you are unable to locate the source of the leak, cleanthe unit as much as possible and sprinkle the suspectareas with baby powder. Recheck after several hours andthe leak should be located.

Excessive oil on the after cooler pipe or compressorhead usually indicates air leaks. Locate these with soapsolution while the compressor is operating. The unloadersshould also be checked while the compressor is in the“off” cycle as they are pressurized during that time.

EXCESSIVE OIL CONSUMPTION

This is a difficult problem to resolve and the followingsteps should be taken before any repairs begin.

a. Confirm the Complaint-Oil at the tank drain doesnot necessarily indicate high oil consumption.Table 3 shows acceptable oil consumption fillamount and time between refills.

Table 3. Acceptable Oil Consumption.

3 I 22 (651) I 80

20 I 64 (1893) 33

*Oil capacity in crankcase between high andstick levels.

**Days running time between high and lowlevel, based on 3 oz/100,000 ft3 with 50duty cycle, does not allow spillage or leakage.

low dip-

dipstickpercent

b. Make certain the proper grade of nondetergent oilis being used (Table 2) and the compressor is notbeing overfilled. Over filling always causes high oilconsumption. Oil level should never be above thehigh mark on the dipstick.

c. Check for leaks.

d. Check intake filter/piping and crankcase breathervalve for cleanliness and obstructions.

75-7267

e. Check for excessive oil pressure or, high percentoperation (See LUBRICATION AND PRESSURESsection.) If after performing the above, it is stillconsidered an oil consumer with no apparentexternal cause) then:

f. Check pump up and cycle pressures against thevalues in the data table. Differences greater than1 0 percent indicate worn parts. (See WON’T

AIR section,)

g. Remove valves (the l/2 hp unit does not haveremovable valves so the head must be removed)and examine piston top. Oil wetted is acceptablebut any accumulation of oil indicates a defectivepump.

The most common reason for a noisy pump is a looseflywheel or motor pulley. Check these first, Then check:

a. Oil pressure-if low, check pump as described inWRONG OIL PRESSURE section. Lack of oilpressure may have caused bearing damage.

b. Valve assemblies-make certain they are tight.

C . Wrist pin or connecting rod bearings-stop pumpand remove belts, Rotate pump back and forth acouple of inches, using the flywheel. If knock canbe heard, it is probably a bad wrist pin or con-necting rod bushings. o d bushings can be in-spected by removing side plate and rod caps.Another way to check is to remove head andobserve piston while rocking flywheel. Pistonshould follow movement without play (except attop and bottom dead center where piston willappear to hesitate). Inspect cylinder and head forcarbon build up.

d, Bad main bearings-check for end play by attempt-ing to move flywheel in different directions. Listenand feel for any play. End play on the crank shaftcan usually be eliminated by removing one of theshims beneath the bearing housing adjustmentplate. A slight drag, when turned by hand, is proper,

ost likely cause is a loose motor pulley. A low-pitched growl could be an indication of low voltage.

If the noise was slight, lubricate motor in accordancewith instructions on nameplate. If noise disappears,motor will probably be ok but should be watched more

carefully as its life has been shortened by the dry bearing.To check bearings, stop motor, remove belt and checkfor side play in motor shaft. Also turn motor by hand;any side play or noise is an indication of bad bearings-replace motor. End play (movement of motor shaft inand out) is common in this type of motor and not anindication of wear.

The use of a large screwdriver or similar implement ishandy here, Place the point end against suspected areasand the other against the ear. WATCH OUT FOR THESPINNING FL Y WHEEL AND BELT.

In the l/2 and l/3 hp sizes: a noise which cannot betraced to the pump or motor will usually be the checkvalve. (The larger units do not have a check valve.) Thecheck valve should be disassembled and inspected.

Another noise which is not easily traceable is the beltguard. This can be checked by applying hand pressure tothe outside surfaces at different points.

If it attempts to start, remove belt and see if motorwill start and run by itself. If motor fails to run, repair orreplace motor. If motor appears to run properly, it maystill have a defective capacitor (single phase models only),While the belt(s) is removed, try turning pump by hand,It should turn freely. If so, then motor is defective orpower is bad. Recheck both and replace motor if voltageis proper. If pump fails to turn freely, check in accord-ance with WON’T PUMP AIR section.

If there is no attempt to start, make certain power isapplied and fuses installed. If a voltage tester is available,check for proper power at the motor terminals. If nopower, trace wiring to locate problem. (Check first atpressure switch.)

If power is at motor terminals but unit is making noattempt to start, feel motor. If hot, built in thermalprotectors (up to 1 hp only) may be disconnectingmotor. Disconnect power and allow motor to cooldown. If motor now attempts to start, treat as describedabove. If cold, motor is defective. Replace.

75-7267 6

This section is broken up into three categories asfollows:

a. Runs, but tank shows no build upb. Builds up, but not completely or takes excessive

timec. Pump slows, stalls, or goes out on overload

a. RUNS, BUT TANK SHOWS NO BUILD UP: Cutoff building air supply to eliminate possibility ofbroken lines by closing supply valve on tank. If unitstill fails to build up, remove air intake. If still nosuccess, disconnect copper lines connected to in-take valves (3/4 hp and up). While the unit is run-ning, no air should be coming out of the copperline. If air is coming out of line, the unloader pilotis stuck or defective. It should be removed, cleanedand inspected. The unloader pilot is at the otherend of the copper line.

If unit is not equipped with unloading valves (l/3to l/2 hp are not), remove discharge tube andcheck for air flow. Block with hand to check abilityto build up. If poor or no discharge air, disas-semble and inspect valves. If discharge is good,look for air leak between pump and tank valve(cracked discharge tube, tank, etc).

b. BUILDS UP, BUT NOT COMPLETELY, ORTAKES EXCESSIVE TIME: Cut off system byclosing tank valve and check pump up time (seedata Table 3). Remove intake and recheck. Dis-connect copper line at intake valves (3/4 hp andup). If air is coming out of line (while unit isrunning), disassemble and clean unloader pilotlocated at other end of line,

Another reason for poor delivery, in multicylinderunits, could be a valve unloader sticking, The valveunloaders can be checked by disconnecting thecopper line leading to them and removing thecover bolts. Tapping with a blunt instrument suchas the handle of a large screwdriver or a smallhammer, will loosen the cover so it may be liftedoff. Carefully remove the diaphragm. This willexpose the piston cup which operates the un-loader. With the unit running, manually depressthe piston. There should be a distinct change inthe intake sound, indicating the valve is being heldopen. Slowly depress the piston. You should firstfeel the resistance of the return spring, then thepiston as it contacts the intake valve, then thesound change as you move the valve off the seat.Use fingernails to remove this piston cup for clean-ing beneath, if necessary.

If the source of trouble has still not been located,remove and inspect intake and exhaust valves fordirt or warpage. (NOTE: The head must be removedon the l/2 hp unit to service valves as they are notremovable,) The piston top and cylinder walls canbe inspected at this time.

C. PUMP SLOWS, STALLS, OR GOES OUT ONOVERLOAD: This is probably the result of thepump seizing. Check oil level (and pressure in 3 hpand up). Check tank pressure, which should be100 lb/in2 (689 kPa).

Remove belt and bleed down tank. Turn pump byhand. It should turn freely. If it does, motor maybe defective. If it does not, it may be the pump ora plugged aftercooler tube. Disconnect dischargetube and turn pump by hand again. If still hardturning, problem is internal to pump. If it nowturns freely, check piping to tank for obstructions.

If this occurs the first time at startup, the motorwiring or voltage may be wrong. Recheck these and alsoconfirm that the oil has been added to the compressor.Check for excessive tank pressure.

Remove belt and check motor alone. Turn pump byhand. It should turn freely. If not, check as described inc. above.

If motor appears to run properly without pump, andpump turns freely, reconnect pump and run with intakeplugged (cover with hand). If motor and pump now runproperly, a low voltage condition probably exists. Take avoltage reading at the motor terminals while the unit ispumping. (Fractional HP motors will usually “growl”with low voltage, a good clue to the problem.)

Usually due to omission of vibration pads or an unevenweight distribution on the pads. Check this by shuttingoff unit and applying your weight to the differentcorners of the unit. Excessive rocking should be shimmedout. In very uneven floors adjustable levelers may beneeded.

Belt guards often produce a vibrating noise even undernormal operating conditions. Readjusting will usuallyeliminate this.

In some cases, the normal operation of the compressoris considered excessive noise or vibration. In these casesa remote air intake, adjustable pads, and air line vibrationisolators may be required. Isolators are stocked in thecommercial warehouse.

7 75-7267

REPAIR PROCEDURE

OIL PUMP REMOVAL

Shut off power, drain oil, and bleed down tank. Re-move belt guard, loosen motor mounts and removebelt(s).

Remove after cooler tube at pump end. If tube is typewhich wraps around crankshaft, then remove both endsand any hold down straps.

If flywheel is accessible, then remove it at this time;otherwise it can be removed afterward if necessary. The1/2 hp unit is held on with a keyed shaft and setscrewand will probably need a puller. All others use a splithub and key and can be removed by removing hub boltsand nuts and driving a wedge into split.

Remove pump intake filter and the unloader airsupply line (3/4 hp and up). Remove pump hold downbolts and remove pump.

CAUTION

If flywheel has not been removed, its weight maytopple pump when the hold down bolts are

Before installing new pump, be sure flywheel is in linewith motor pulley before removing wedge and tightening.

NOTE: When removing discharge tube connector fromold pump, it is recommended that the malecoupling on the discharge tube be looselyinstalled in the connection to prevent itscollapse during removal.

OIL PUMP REPLACEMENT

The oil pump is factory ground as an assembly, andpartial replacement is not possible. In the event that thepump, or crank bearing which is part of the pump, isdeemed faulty, it should be replaced as a unit. Theassembly is held by four bolts (see Figure 4). The replace-ment unit does not include an oil gage that must beordered separately. After reinstallation, the oil pressuremust be adjusted. Refer to WRONG OIL PRESSUREsection.

Fig. 4. Crankcase Group.

75-7267 8

Disconnect power and loosen motor clamping boltsand slide motor towards unit. If the compressor has atotally enclosed belt guard, it will have to be removed.Remove and replace belts. Motor should be held snugagainst belts when retightening so that the belt(s) do nothave more than 1 inch total play. Make certain motor issquare to belts and reinstall guard and turn on power.

NOTE: Sometimes new belts stretch excessively afterbeing installed; recheck after one week. SeeTable 1 for belt specifications.

Before replacing motor, refer to NOISY MOTORand WON’T START sections. If motor is considereddefective, disconnect power and replace motor. Whenreinstalling motor, reset belt tension in accordance withBELT REPLACEMENT section.

CAUTION

Many motors are dual voltage. Check motorinternal wiring against diagrams on motor orinside of wiring cover plate for proper connectionsfor voltage being used.

The 3/4 hp and larger units have automatic unloaderson the intake valve(s). The unloader for the I hp unit isshown in Figure 6. All other units (3/4 and up) use theunloader shown in Figure 7. Access to the intake valvesis gained by unscrewing the unloaders from the headassembly. Exhaust valves can be removed by unscrewingthe hold down caps covering them.

IIf

i---s ----/-----./ \SECOND INTAKE

\

UNLOADER ASS’Y

HEAD

INTAKE VALVE ASS’Y

5 7 0 7

INTAKE AND EXHAUST VALVES, UNLOADER Fig. 6. Air Unloading of Intake Valves on I HP Unit.

The intake valves, exhaust valves and unloader mech-anisms can be disassembled for inspection, cleaning, orrepair in all sizes except the 1/2 hp. The 1/2 hp unit is asealed assembly in the head. In the event the valves aredeemed defective in this unit, replace the head assembly(Quincy Part No. 2400-X2P).

The l/3 and l/2 hp units have unloaders on the pres-sure switch and a check valve.

On the l/3 hp unit, remove the two valve locking nutsin the head. The valve parts can now be removed for in-spection. See Figure 5 for the proper order of reassembly.

7483XAIRUNLOADERASSEMBLY

5 7 0 6Fig. 5. Unloader for 1/3 HP Unit.

- H E A D

5 7 0 8

Fig. 7. Air Unloading of Intake Valves on 3/4 HP Unitsand Up (Except 1 HP Unit).

9 75-7267

The unloader pilot is located on the crankcase and isconnected to the unloader by a copper line. The 3/4 hpunit uses a pilot that is mechanically activated (Figure 8);all others are operated by oil pressure (Figure 9). Theunits should be disassembled and cleaned if they are sus-pect.

PRV STATION

The l/3 to 2 hp units may use a Honeywell PP902prv. The l/3 to 5 hp units may use a Honeywell PP901prv. For detailed maintenance and repair information,see Form No. 75-2558.

The prv station used on the 7-l/2 to 20 hp units is acombination of Pall-Trinity-Micro Corp. filter and Nor-gren regulator and relief valve (see Fig. 12).

To perform any maintenance and repair work on theprv station, first shut off air supply from tank. Then,bleed down system by manually operating the dram(push red button on drain valve).

The regulator and relief valve can now be removedand replaced or repaired in place with the appropriaterepair kit (see parts list),

After repairing or replacing, slowly turn air back onchecking for leaks,

Fig. 8. Three-Way Valve Assembly (3/4 HP UnloaderPilot).

Fig. 9. Hydraulic Unloader Assembly (1 HP Units andLarger).

75-7267 10

STANDARD rz OUTDOOR

STANDARD 1 OUTDOOR 1 ELEMENT

Fig. 1 1. Quincy Air Maze Intake Filter.

Fig. 10. Honeywell Intake Filter - Part No. AK3895-4.

)FILTER-PRV ARRANGEMENT

FILTEASS’Y 8

LATENT

,I ANK

Fig. 12. Typical PT (Pall-Trinity-Micro) Filter-PRV Arrangement, Tank Mounted (See Table 4).

11 75-7267

efer All Inquiries toQuincy Compressor

Refer All Inquiries to

PT

PTM

Norgren

Norgren

Quincy

Quincy

Honeywell

Honeywell

Quincy

Quincy

Quincy

Quincy

Locally

Locally

Locally

h e n ordering parts, it is important to provide allinformation shown on the nameplate. See Fig. 13.

rder from local Quincy representative or:

Colt Industriesuincy Compressoruincy, IL 62301

NOTE : State complete uincy compressor serial num-ber as stamped the nameplate of each com-pressor when ordering parts or discussing

problems on a specific compressor.incy service depots is included with

the instructions packed with each compressor.

Colt Industries Q u

Fig. 13. Compressor Nameplate,5712

Local distributor or:

Pall-Trinity-Micro CorporationCortland, NY 13045

State exact part number.

Local distributor or:

C.A. Norgren CompanyLittletown, CO 80120

State exact part number.

. Dundee RoadArlington Heights, IL 60004

State part number and compressor model number.

HONEYWELL•Minneapolis, Minnesota 55408•Scarborough, Ontario•Subsidiaries and Aff i l iates Around the World.•Printed in U.S.A.