OVERCENTER OR SECTOR GEARSHAFT OVERCENTER OR SECTOR GEARSHAFT

valve assembly, adjuster plug assembly, and locknut

holes for stripped threads or other damage.

are assembled in the housing assembly. Proceed as

(2) Inspect mounting flange cover, housing

follows:

drive gear shaft and driven gear shaft for cracks and

(1) Before adjusting preload, tighten adjuster

distortion.

plug up snug, back off slightly (1/8 turn) and measure

(3) Inspect bores in bearings [or scoring and

valve assembly drag.

pitting and for excessive wear as indicated by loose fit

(2) Turn adjuster plug in so that preload is I to

on bearing surfaces of drive gear shaft and driven gear

3 Inch pounds in excess of valve assembly drug.

shaft.

Tighten locknut. Total thrust bearing adjustment and

(4) Inspect teeth on drive gear shaft and

seal drag is riot to exceed 8 inch pounds.

driven gear shaft for pitting, chipping and excessive

wear.

6-170. OVERCENTER OR SECTOR GEARSHAFT

(5) Inspect interior surfaces of pump housing

ADJUSTMENT. This adjustment is to be made after the

for scoring, pitting and other damage.

gear is completely assembled. Proceed as follows:

(1) With gear on center and last adjuster

6-176. REPAIR. Repair hydraulic pump parts as

screw backed off, measure total drag.

follows:

(2) With gear on center adjust lash adjuster

(1) Repair minor thread damage with tap or

so that preload is 4 to 8 inches in excess of total preload

thread chaser.

and drag. Readings are to be made through an arc not

(2) Replace parts that are cracked or

exceeding 20 degrees with gear on center.

distorted, or that are excessively worn.

(3) Tighten lash adjuster locknut.

(3) Replace all packings and seals at each

reassembly.

6-171.

HYDRAULIC PUMP.

6-177. REASSEMBLY. Reassemble, hydraulic pump

6-172. DESCRIPTION. The hydraulic pump is driven

parts as follows:

by the electric pump motor and provides hydraulic fluid

(1) If removed, press pins (16, figure 7-16)

pressure for extending the tilt cylinders and the hoist

into housing (17). Fit all packings (5, 6, and 8) neatly

cylinder. The pump is a positive displacement type

into recesses in housing (17) and flange cover (2).

having a rated capacity of X.7 gallons per minute at

(2) Fit bushings (9 and 12) together, using

1.200 rpm and 1.000 psi. Removal of the hydraulic

pins (13) for alignment, install them on gearshafts (10

motor is required for repair.

and 11) and replace this assembly in housing.

(3) Press new seal (4) into cover (2), install

6-173.

DISASSEMBLY. Proceed as follows:

retaining ring (I) and replace cover on housing. Secure

(1) Remove retaining ring (1, figure 7-16) and

with screws (3).

CAUTION

eight screws (3) securing mounting flange cover (2) to

housing (17). Press seal (4) out of mounting flange

Tighten cover screws gradually, alternating from

cover.

side to side of cover, to avoid warping cover by

(2) Remove driven

gearshaft (10, drive

uneven pressure from screws in one area.

gearshift (11), four bushings (9 and 12) and two pins

(4) If pump is not to be installed immediately,

(13).

plug inlet and outlet parts to keep dirt out during storage

(3) Remove two packing retainers (7) and

period.

packings (5, 6 and 8). Do not remove two pins (16)

from housing (17) unless necessary.

6-178

POWER STEERING PUMP.

6-174. CLEANING.

Clean disassembled parts of

6-179.

DISASSEMBLY. Proceed as follows:

hydraulic pump as follows:

(1) Remove pump manifold (I, figure 7-31)

(1) Wash all parts in SD and dry with soft

and gasket (4) from steering pump attached with three

cloth or with compressed air under moderate pressure.

screws (2) and washers (3).

(2) Ensure that fluid passages in housing are

(2) Remove body (10) attached with four

free of obstructions.

screws (I 11). Remove packings ( 1 2 and 13).

(3) Remove vanes (19) and rotor (20) and

6-175

INSPECTION. Inspect hydraulic pump parts

separate vanes from rotor.

as follows:

(1) Inspect all threaded parts and tapped

6-42