DIRECT SUPPORT MAINTENANCE
ADVANCED AVIATION FORWARD AREA REFUELING SYSTEM MODEL M100A1
REPLACE FUEL TRANSFER PUMP PN 8424 VANE PUMP HOUSING O-RINGS
Key, Socket Head Screw, 3/16"
Compound, Anti-Seize, Molybdenum Disulfide
Wrench, Combination, 7/16"
Lay pump on inlet.
Remove thrust washer (1) from shaft.
Remove dowel pin (2) from shaft.
Remove the six socket head screws (3) and flat washers (4) that secure the vane pump housing (5) to the impeller
Install three 1/4-28 x 1-1/2 inch jack bolts in the threaded holes spaced around the vane pump housing circumference.
Remove vane pump housing by alternately tightening the jack bolts until housing is free. Remove jack bolts.
Count shims to ensure same number is installed during assembly.
Lift housing (5) and shims (7) from shaft.
Do not attempt to remove carbon bearing in vane pump housing. Bearing can only be replaced at the
Remove and discard both O-rings (8) from face of vane pump housing.
Inspect and clean O-ring grooves as required. Any debris or foreign matter may prevent O-ring from seating properly.
10. Inspect and clean the mounting surface and vertical lip of the pump housing where the vane pump housing is attached.
Ensure all paint and debris have been removed.