GENERAL SUPPORT MAINTENANCE
ADVANCED AVIATION FORWARD AREA REFUELING SYSTEM MODEL M100A1
OVERHAUL FUEL TRANSFER PUMP PN 60975-7
Anti-Seize Compound, Molybdenum Disulfide
Wrench, Combination, 1/2"
Wrench, Combination, 7/16"
Key, Socket Head Screw, 9/64"
Key, Socket Head Screw, 3/16"
Wrench, Combination, 9/16"
Wrench, Combination, 1-5/8"
Screwdriver, Flat Blade, 1/8"
Fuel transfer pump defueled
Fuel transfer pump removed from pump-engine
Hammer, Ball Peen, 2 lb.
Quick disconnect fitting removed from pump
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 (8) unless replacement is required.
Refer to WP 0088 00 for flapper valve disassembly and assembly.