TM 9-2320-289-34
3-42.
FUEL INJECTOR PUMP HYDRAULIC HEAD MAINTENANCE (Con’t).
3.
Inspect weight retaining ring (33) on weight retainer (7) for damage. Replace weight retaining
ring if damaged,
4.
Inspect delivery valve (24) for chipping or erosion at edges of retractor cuff (25), Edges of
retractor cuff should be sharp. Replace delivery valve if retractor cuff is chipped or eroded, or
if edges are not sharp.
CAUTION
Never handle precision-ground surface of rotor (16). Failure to follow this
caution may result in damage to rotor.
5.
Submerge rotor (16) in clean calibration fluid and insert plungers (29) into their bores. With
thumb and forefinger over shoe (23) slots, tilt rotor from side to side to determine if plungers
move freely. If plungers are sticking, but not visibly damaged, clean both plungers and rotor
bore with a soft brush and acetone.
6.
Inspect spring (26) for distortion, corrosion, or breakage. Replace if distorted, corroded, or
broken.
7.
Inspect all components for rust, nicks, scratches, and wear that appears uneven or may result
in looseness or leakage. Replace any component that is rusted, nicked, scratched, or has
excessive or unusual wear.
TA50748
3-151
