ARMY TM 9-2815-256-24
AIR FORCE TO 38G1-96-2
MARINE CORPS TM 2815-24/5
3-27.4.7 Cam Rollers and Shoes.
Never attempt to press a roller into a shoe from outer edges, as groove width at this point is less than
roller outside diameter and shoe breakage may result.
Check each roller in its shoe for freedom of movement. Inspect top edge of each shoe, where retained by leaf
spring, for chipping or excessive wear. Inspect roller and shoe for abrasive wear patterns.
3-27.4.8 Leaf Spring and Screw.
To prevent possible improper positioning of parts and unnecessarily disturbing leaf spring
adjustment, do not remove screws (25, FIGURE 3-73) and leaf springs (26) unless they are being
replaced or a new rotor and head assembly is being installed.
If damaged, remove screws (25, FIGURE 3-73) and leaf springs (26).
Check for excessive wear at points where spring contacts radii on rotor and along steps that retain roller shoes.
Check adjusting screw for tightness in rotor.
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 spalling 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.
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
In addition to parts supplied with repair kits, cam (17, FIGURE 3-64), connector assembly (1), insulation
washers (15), delivery valve stop (35, FIGURE 3-73) and pilot tube seal (1) must be replaced during assembly.
3-27.5.2 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.