TM 10-4320-307-244-10LUBE OIL PUMP ASSEMBLY REPAIR (CONT).9.Inspect drive shaft (6) and lube oil pump driven gear (7) for damage and worn or broken gear teeth. Gears must be replaced if pitting is present over more than 1/4 width of teeth. If necessary, replace drive shaft or gear using arbor press.10. Inspect idler shaft (8) and lube oil pump idler gear (9) for damage and worn or broken gear teeth. Gears mustbe replaced if pitting is present over more than 1/4 width of teeth. If necessary, replace idler shaft or gear.11. Inspect bushings (10) in pump body (1), pump cover (2), and pump idler gear (9) for excessive wear or discoloration due to overheating or seizing. If necessary, replace bushing with arbor press and bushing mandrel.NOTEIf drive shaft and clearance checkperformed in paragraph 3-30 indicatesexcessive bushing wear, replace driveshaft bushings.12. Inspect pressure regulator plunger (11) to see if it is bent. Try plunger in pressure regulator bore in oil pumpbody (1) to ensure that it does not bind. Inspect plunger for scratches or scoring. Replace plunger if it isbent, binds in the bore, or if scratches are present which can be felt with a fingernail.13. Inspect pressure regulator spring (12) for damaged or broken coils. Replace spring if damaged.14. Using valve spring tester, compress pressure regulatorspring (12) to a height of 1.820 inches (46.23 mm). Theforce required to compress the spring to this height must be 22 to 26 lbs (98 to 116 N). Replace spring if it does not conform with this standard.4-74
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