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 TM 55-1905-223-24-3
NOTE
Some double lubricating oil pumps have a scavenger pump body that must be
removed after the drive shaft is pushed through the driven gear. After removing
scavenger pump body, repeat steps b. and c.
d. If the oil pump has a tube for piston cooling and the tube is damaged, push the tube from the inside
part of pump body to remove.
e.
Push idler shaft (26) from pump body (31).
WARNING
Carefully remove the capscrew. The pressure regulator spring is under compression.
f. Remove capscrew (1), lock plate (2), clamp (3), vent plug (4), helical compression spring (5) and
pressure regulator plunger (6). Ensure plunger (6) moves freely in the bore.
REPAIR
a.
Check idler shaft (22) for damage. Replace if damaged.
b. Check dowel pins (8) in the pump body (31) for damage. Use dowel puller P/N ST-1134 to remove
damaged pins.
c.
Check drive shaft (30) for damage.
d.
Check all gears (25, 27 and 34) for worn or broken teeth. Replace with new ones if damaged.
e.
Check pump body (31) for cracks, worn bushing threads or scratched gasket surfaces.
f. Use bushing mandrel, P/N ST-1158, and push bushings (24, 28) from pump body (31), cover (23) and
gears (25, 27 and 34).
g. Use bushing mandrel, P/N ST-1158, to push new bushings (24, 28) into body (31), cover (23) or gears
(25, 27 and 34). Bushings must be even with or 0.020 inch (0.51 mm) below surface of body (31),
cover
(23) or gears (25, 27 and 34).
h.
Use lubricating oil pump boring tool to cut the bore in the new bushings in the pump body (31).
i.
Cut the bore in new bushings:
(1)
Install the guide bushing (1, Figure 3-49) into the gear pocket. Tighten the capscrew (2) against the
side of the gear pocket to hold the guide bushing in position.
3-94
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