Cleaning. - TM-55-1930-208-240043

TM 55-1930-208-24

3-12. HYDRAULIC PUMP-Continued.

b. Cleaning.

WARNING

Do not breathe cleaning solvent P-D-680 vapors for long periods of time or use solvent near open flames.

To avoid illness, explosion, or fire, only use solvent in well-ventilated areas away from open flames.

(1) Clean all metal parts with cleaning solvent (item 4, Appendix C).

(2) Allow parts to dry.

c. Inspection.

(1) Inspect housing (6) for cracks or other visual damage. Check threads for damage. Check valve seats (12

and 28) for damage or scores. The bore of the sleeve (42) must be smooth with no scratches or scoring.

(2) Inspect bearings (34, 40, and 41) to be sure that they are free and turn smoothly. Check throw bearing

(34) to be sure 0. D. is not galled or has not picked up metal from end of piston (36).

(3) Inspect shaft (33) to be sure that it is free of burrs. There should be no indications of wear at bearing

journals. Check to be sure that keyway is not broken out or rounded over, due to coupling having been

loose or an improper fit.

(4) Inspect piston (36) to be sure it fits freely in bore of sleeve and be free of scratches or scoring. Also, the

bleed hole must be free of all contamination.

(5) Inspect balls (5, 11, and 27) and their seats for damage or scoring.

(6) Inspect springs (4, 9, 17, and 26) to be sure that they are not bent or deformed. Check for signs of

chaffing.

(7) Replace O-rings (3, 15, 19, 22, 25, and 32) and oil seal (39).

d. Repair. Repair is limited to replacement of defective parts found during inspection.

e. Reassembly.

(1) Refer to figure 3-10 and position flange (52) on camshaft gear and secure with four lockwashers (51) and

four screws (50).

(2) Install seal (47) and shaft (46) in housing (49). Install setscrew (45). Position assembled housing (49) and

gasket (48) on the engine and secure with four lockwashers (44) and four screws (43).

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