INSPECTION - TM-55-1730-228-13-P0263

TM 55-1730-228-13&P

4-20. HYDRAULIC PUMP - REPAIR (Continued)

4-20

CAUTION

Care should be taken not to damage the shaft seal bore as this would result in seal leakage. If in doubt,

replace the seal.

b. INSPECTION:

(1) Clean all parts with cleaning solvent and dry with a lint-free cloth.

(2) Inspect moving parts for evidence of wear, burrs, nicks, chips, scoring and other damage.

(3) Replace damaged parts with new parts.

c. ASSEMBLY:

NOTE

Lubricate all preformed packings with clean hydraulic oil before assembly.

(1) Place body (1) on flat plate with shaft seal bore up. Install new shaft seal (9). Press seal in approximately

1/16 inch (1.52 mm). Pack the area between the double lip of the seal with GAA grease.

(2) Invert body so that gear bores are up. Install wear plate (4) in bottom of bore, making sure that spacers

(10 and 11) are positioned properly in seal grooves and installed against bottom of bore surface.

(3) Lubricate bushings in body and face of wear plate with clean hydraulic oil.

(4) Apply GAA grease to outer surface of drive gear (8). Install drive gear (8). Install driven gear (5), with

long journal toward front of pump.

(5) Lubricate rear gear faces and journals with clean hydraulic oil and install thrust plate (3) in position, bronze

face toward gears.

(6) Apply a small amount of GAA grease to rear cover (2) seal groove and install new rear cover seal (7) into

groove.

(7) Lubricate rear cover bushings with clean hydraulic oil.

(8) Position pump with shaft end down, install the rear cover (2). Matching scribe marks on cover and body

(1).

(9) Check that drive shaft turns with adjustable wrench without evidence of mechanical bind.

END OF TASK

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