TM 55-1930-209-14&P-21
(5)
Remove four bolts and lockwashers securing cover to oil pump body.
(6)
Remove valve plugs and copper gaskets from each side of pump body, and jar relief valve parts from
body.
(7)
Remove pump driven gear from driven gear shaft.
(8)
Straighten lip of lockwasher and unscrew bolt thus freeing idler gear.
(9)
Clamp pump body, drive shaft, and gear assembly in a bench vise. Pull drive-driven gear from outer end
of pump drive shaft.
(10)
Remove Woodruff key from drive shaft and withdraw shaft and driven gear from pump body.
(11)
Unscrew bolt and remove idler gear support from pump body.
(12)
If drive gear is to be replaced, position gear and shaft assembly on bed of arbor press with long end of
shaft extending down through slot in bed plate and with face of gear resting on plate. Place a short 1/2 inch round steel
rod on end of shaft, and press shaft from gear.
(13)
Disassemble remaining parts as necessary to effect repair.
CAUTION
Do not remove oil pump drive gear from crankshaft unless excessive wear is evident.
(14)
To remove pump gear from drive shaft, engine lower front cover (Figure 6- 22)
must be removed.
(15)
Thread crankshaft pulley retaining bolt into crankshaft. Attach a suitable puller behind gear and locate
puller screw in center of pulley retaining bolt.
(16) Pull drive gear off crankshaft.
6-20
Oil pump cleaning, inspection and repair
a.
Cleaning. Wash all parts with cleaning solvent and dry thoroughly.
b.
Inspection and Repair
(1)
Inspect pump rotor lobes for excessive wear. Remove any scratches or score marks with an emery paper
or stone.
(2)
Measure clearance between inner and outer rotors at each lobe. It should be between .004 and .011 inch.
Clearance between face of pump body and faces of rotors should also be measured. Proper clearance is between .001
and .0035 inch.
(3)
Inspect pump gears for chipped teeth or excessive wear.
6-44
