Figure 4-23. Hydraulic Pump Assembly (Sheet 2 of 2).

TM 55-1730-228-13&P

4-20. HYDRAULIC PUMP - REPAIR (Continued)

4-20

Figure 4-23. Hydraulic Pump Assembly (Sheet 2 of 2).

a. DISASSEMBLY:

(1) Scribe match marks on body (1, Figure 4-23) and cover (2) to ensure proper assembly.

NOTE

During disassembly, take special note of the wear patterns on the wear plate (3) and thrust plate (4).

Relate these patterns to the inlet and outlet sides of the pump. The large port in the rear cover (2) always

corresponds to the inlet side of the pump. The inlet side can be further identified by the gear contact

pattern in the gear bore. The wear plate (3) will have a somewhat heavier wear pattern on the inlet side.

the thrust plate (4) will also have a pattern that can be established for assembly. Also note that the long

journal of the driven gear (5) is toward the front of the pump.

(2) Separate rear cover (2) from body (1) by supporting pump, shaft end up, on mounting flanges and pressing

on drive shaft end in arbor press.

(3) Holding pump shaft end down, remove rear cover (2). Dowel pins (6) may remain either with body or rear

cover.

NOTE

Cover gasket (7) and thrust plate (3) may or may not remain with rear cover. Should they remain with

body, remove gasket and lift out thrust plate before proceeding.

(4) Lift out driven gear (5), drive gear (8), and wear plate (4).

(5) Remove spacers (10) and (11).

(6) Invert pump body with shaft seal up. Remove shaft seal (9) by prying it out with a roll pin bar.

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