TM 5-3810-300-24&P-3
OIL PUMP 4.1
10. Straighten the lip of the lock washer (84) and
unscrew the bolt (83) thus freeing the idler gear
(56).
11. Clamp the pump body, drive shaft and gear
assembly in a bench vise. Pull the drive-driven
gear from the outer end of the pump drive shaft
as shown in Fig. 4.
12. Remove the Woodruff key (14) from the drive
shaft and withdraw the shaft and driven gear
(22) from the pump body.
13. Unscrew the bolt (86) and remove the idler gear
support (82) from the pump body.
14. If the drive gear (23) is to be replaced, position
Fig. 4. Removing Oil Pump Drive-Driven
the gear and shaft assembly on bed of arbor
Gear from Shaft
press with long end of shaft extending down
through slot in bed plate and with the face of the
Disassemble Oil Pump
gear resting on the plate as shown in Fig. 5.
Place a short 1/2" round steel rod on the end of
Observe carefully the position of all parts including the oil
shaft, and press the shaft from the gear.
inlet and outlet pipes during disassembly so as to
facilitate the reassembly of the pump.
Inspect Oil Pump Parts
1. Remove the scavenging pump inlet pipe
Wash all parts in clean fuel oil and dry them with
together with the inlet screen, if so equipped,
compressed air.
from the scavenging pump body.
Examine the gear cavity in the pump body and the drive
2. Remove the scavenging pump outlet pipe, if so
shaft bushings. If the gear teeth are scored or worn,
equipped.
install new gears. If the driven gear bushings are worn,
replace the bushings. Service replacement bushings in
3. Remove the oil pump inlet pipe (19) with the
the driven gears must be reamed after assembly.
screen cover and mounting brackets.
Bushings used with the .499" diameter driven gear shaft
must be reamed to .500" +.0005" and bushings used
4. Remove the oil pressure regulator and the oil
pump outlet pipe (15) as an assembly from the
pump body (3).
5. Remove the four bolts and lock washers
securing the scavenging pump body or the cover
to the oil pump body (3).
6. Remove the scavenging pump drive and driven
gears from the oil pump drive and driven shafts,
if so equipped.
7. Remove the Woodruff keys from the drive shaft
and slide the spacer off the end of the shafts, if
Step 6 performed.
8. Remove the valve plugs (37) and copper
gaskets (36) from each side of pump body, and
jar the relief valve parts from the body (Fig. 3).
Fig. 5. Removing Oil Pump Drive Gear from Shaft
9. Remove the pump driven gear (22) from the
driven gear shaft (24).
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