DIRECT SUPPORT MAINTENANCE
ADVANCED AVIATION FORWARD AREA REFUELING SYSTEM MODEL M100A1
REPLACE FUEL TRANSFER PUMP PN 60975-5 OUTLET FLAPPER VALVE/O-RINGS
Tool kit, General Mechanic Automotive
Fuel transfer pump defueled
Remove the three hex head screws (1) and flat washers (2) that secure the outlet (3) to the diffuser case (4). Lift the
outlet (3) off the diffuser case (4).
Remove and discard O-rings (5) and (6).
The flapper valve is a butterfly valve designed to open when fuel pump full flow has been attained. Before
disassembly, note the orientation of the springs on the valve body and the valve body position in the pump
outlet for assembly and installation. The springs appear to be identical when installed; the difference can be
seen only when the springs have been removed. The springs are properly installed when the flapper valve
matches the one shown in the figure inset. Use care not to lose any spacer when removing flapper valve
Remove flapper valve assembly (7, 8, 9, 10, and 11) by pushing down on outer pin (7) from the top, just enough so that
the top of the outer pin (7) clear diffuser case (4) top outer pin hole. Pull the top of flapper valve assembly out far
enough to push up on outer pin (7) from the bottom to clear diffuser case (4) bottom outer pin hole, using care not to
lose any of the six small spacers (9) remove flapper valve assembly. Inspect flapper valve assembly for damage. Replace
if damaged or otherwise unfit for use. Do not disassemble flapper valve assembly unless replacement is required. If
disassembly is not required, proceed to step 5.
To disassemble flapper valve assembly, remove the center pin that secures the springs (10 and 11) to the two flapper
The check valve seat is a tight fit but can be removed by hand. It is not secured by any type of fastener.
Remove the inner pin (12) and the check valve seat (13). Inspect the check valve seat (13) for damage. Replace if
damaged or otherwise unfit for use.
Remove and discard O-ring (14) from check valve seat (13).