Inspect panels, gaskets, and grommets on engine for cracks, tears, and hardening.
Inspect hydraulic pump, generator, and other parts for damage that would impair their use.
Repair or Replacement
Replace support, mounts, cooling duct, chain case, and chain cover if not repairable by welding.
Repair damaged threads with a thread chaser or replace threaded parts that are defective.
Replace any other parts that are defective.
To seat the generator brushes sufficiently and eliminate hard-starting problems, when replacing the generator or its brushes,
sand the brushes as specified in a thru l below:
Remove generator from APU.
Remove brush guard band from generator.
Remove screw to brush lead wire.
Move aside brush retainer springs sufficiently to clear brushes. A screwdriver or stiff piece of wire bent into a hook
shape can be used to accomplish this.
Remove both brushes in any one brush set, and insert a piece of sandpaper (approximately 2 in. [5 cm] and 180 grit)
beneath empty brush holder.
Insert only one brush back into holder, and while pressing down on top of the brush lightly, move it back and forth in
the holder, and against the sandpaper until the entire face of the brush is sanded. This only requires about a dozen firm
strokes of the brush against the sandpaper.
Replace brush set back into the brush holder.
Replace brush retainer springs on top of brush.
Replace brush lead wire using its respective mounting screw.
Repeat steps c thru i above for all six brush sets in the generator.
Replace brush guard band.
Replace generator on APU.
Apply sealing compound to all pipe threads except swivel fittings.
Apply adhesive sealant on gaskets (132) during installation.
Install two bearings (135), sprockets (134), oil seals (133), and gaskets (132).
Install pump bearing retainer (hidden) (131), four screws (hidden) (130), and pump adapter (129).