ARMY TM 9-2815-255-24
AIR FORCE TO 38G1-95-2
MARINE CORPS TM 2815-24/4
3-27.4.9 Cam Ring.
Only working portions of lobes on inside diameter are ground, so any tool marks between lobes should not be considered
as damage. The mottled appearance of cam is from heat treatment rather than from operation. Carefully inspect cam
lobes and edges of all flat surfaces. If there is evidence of spilling or flaking out, replace with a new cam.
3-27.4.10 Governor Weights.
Check pivot points (heel or toe) of all weights for excessive wear.
3-27.4.11 Transfer Pump Blades.
Inspect with utmost care. Check for chipping on any edges, including spring bore edges, pitting, imbedded foreign
particles, or scoring on rounded edges. Determine blade wear by measuring length (0.538 inch [13.67 mm] minimum).
Inspect flat surfaces visually for deep scores. If any discrepancies are noted, replace both blade sets and springs.
Inspect housing for chips, cracks, damaged threads, imbedded foreign particles, or any other abnormal conditions.
Replace if damaged.
3-27.4.13 Bushings, Drive Shaft, and Throttle Shaft.
Inspect for excessive wear, cracks, loose fit in housing, or any other abnormal conditions. Replace if damaged.
3-27.5.1 Delivery Valve.
Delivery valves of various retraction values are used for different applications. Correct part numbers are found on
individual pump specifications. Letters 'OV' etched on base of rotor indicate a 0.001 inch oversize delivery valve bore.
A rotor so marked must use a 0.001 inch oversize delivery valve. Part numbers for both standard and oversized valves
are listed on individual pump specifications. An oversized valve is also identified by blackening on both ends and in
groove on delivery valve shank.
Since plungers are positioned centrally in their bores during operation and their travel is extremely short, wear of
plungers is negligible. However, replacement may be made in instances where rust or damage in handling has occurred.
Plungers of any given nominal diameter are graded in four select fit sizes (A, B, C, and D). The rotor is etched with a
letter indicating bore size, this mark is found on base of rotor. If plunger replacement is required, check size designation
on rotor and use plunger of corresponding part number. For example; the basic plunger is part number 11086 and
graded sizes, A through D, are part numbers 11087 through 11090. Therefore, a replacement plunger for a pump with a
rotor marked 'C' would use part number 11089.
Diesel fuel Is flammable and toxic to eyes, skin, and respiratory tract. Skin/eye protection
required. Avoid repeated/prolonged contact. Good general ventilation Is normally adequate.
Throughout assembly procedures It Is stated to use grease on various parts. Do so sparingly as
it can plug return fittings and pump will not bleed air from housing during startup.