Section II. STEERING PUMP AND CYLINDER

TM 10-3930-631-34

KEY to fig.

5-2:

(3) Turn adjusting screw clockwise to in- crease

1. Screw

18.

Spring

pressure and counterclockwise to decrease pressure.

2. Washer

19.

Spring and ball assembly

Adjust screw until pressure is within limits described

3. Lock washer

20.

Screw

4. Nut

21.

above.

5. Clamp

22.

Housing

(4) Install cap nut on pump and lower truck from

6. Bracket

23.

Bearing

lift or ramp. Remove block from spindle.

7. Screw

24.

Gear

(5) Turn off master switch, disconnect battery

8. Lock washer

25.

Retaining ring

9. Nut

26.

Key

receptacle and discharge capacitors.

10. Pump and motor assembly 27.

Shaft

(6) Remove gage and tee fitting from adapter on

11. Screw

28.

Retaining ring

steering valve unit. Connect pressure hose to steering

12. Lock washer

29.

valve unit.

13. Coupling

30.

Shaft

14. Gasket

31.

Shim

(7) Install floor and toe plates on truck.

15. Cap nut

32.

Seal

16. Gasket

33.

Plug

17. Adjusting screw

34.

Pump stator

Section II. STEERING PUMP AND CYLINDER

5-3. Power Steering Pump

damaged or worn or ball does not seat properly, replace

a. Removal. Refer to paragraph 2-11. and remove

parts.

the power steering pump from the truck.

(6) Inspect coupling (13) for wear and damage.

b. Disassembly.

Replace worn or damaged coupling.

(1) Remove cap nut (15, fig. 5-2), gasket (16),

d. Assembly.

adjusting screw (17), spring (18) and spring and ball (19)

(1) Coat all parts with clean hydraulic oil (OE)

from pump stator.

before assembly.

(2) Place pump in a vise. Remove screws (20)

(2) Press or install new oil seal (32, fig. 6-2) in

and separate stator from housing. If necessary, break

stator.

housing loose by tapping with a soft hammer. Remove

(3) If bearings (23) were removed, install new

shims (31).

(3) Remove retaining rings (25) from drive shaft

bearings in housing and stator. Press bearings in with an

(27) and remove gear (24) and key (26) from shaft.

arbor press. Apply pressure to bearing only on the end

Remove drive shaft.

with bearing number stamped on

(4) Remove idler shaft (30), with gear at-

it.

tached, from gear housing. Remove retaining rings (28)

(4) Lubicate drive shaft (27) with oil (OE) and

and remove gear (25) and pin (29) from shaft.

install drive shaft through oil seal in pump stator (34).

(5) Use a suitable puller and pull oil seal (32)

Use extreme care to avoid damage to sealing lip of oil

from stator (34). Discard oil seal.

seal.

c. Cleaning, Inspection and Repair.

(5) Install one retaining ring (25) in groove on

(1) Clean all parts in cleaning compound,

shaft. Install key (26) and gear (24) on shaft. Secure

solvent, (Fed. Spec. P-D-680). Dry thoroughly.

gear with remaining retaining ring (25).

(2) Inspect bearing (23, fig. 5-2) for wear and

(6) Install pin (29) in idler shaft (30) and install

damage. Replace bearings if worn or damaged. Remove

one retaining ring (28) in groove on shaft. Install gear

bearings with a suitable bearing puller.

(24) on shaft over pin and secure gear with remaining

(3) Inspect surfaces of gear pockets and gears

retaining ring (28).

for scoring and wear. Inspect gear teeth for wear and

(7) Position idler shaft assembly in gear housing

galling. Replace unserviceable gears. If gear pockets in

(22) and mesh gear teeth with gear (24).

housing or stator are worn or scored, replace entire

(8) Measure running clearance between gears

pump.

and gear housing. Running clearance should be 0.0008

(4) Inspect idler shaft and drive shaft for wear

to 0.0013 inch (0.020-0.033 mm). Select the proper

on bearing and oil seal surfaces. Inspect idler shaft pin

thickness of shims (31) to give correct clearance.

and key for damage. Replace unserviceable parts.

(9) Position shims (31) between gear housing

(5) Inspect relief valve spring assembly for bent

and stator and install stator on housing. Secure stator to

or damaged spring and worn or damaged ball. Check

housing with screws (20). Tighten screws to a torque of

seating of ball in stator. If parts are

108 to 130 pound feet (14.9- 17.9 m/kg). Check pump

drive shaft. Shaft should rotate freely.

5-3