TM 9-2350-256-34-1c. Cleaning.(1) Scrape cork gasket and silicone adhesive fromall areas. Clean with a wire brush, then with dryclean-ing solvent or mineral spirits paint thinner. Dry withcompressed air.(2) Clean dirt and other foreign material from allmetal parts with drycleaning solvent or mineral spiritspaint thinner. Dry with compressed air.(3) Remove dirt and other foreign material fromelectrical leads and connectors with a wire brush andclean water. Dry with compressed air.d. Inspection and Repair.(1) Inspection.(a) Inspect support, mounts, cooling duct, chaincase and chain cover for cracks, distortion and break-age.(b) Inspect threaded parts for nicks, crossthreading and other evidence of excessive wear.(c) Inspect drive chain for cracks, breakage andother evidence of wear which could cause breakage.(d) Inspect hose and hose assemblies for fraying,cracks, distortion and other evidence of excessivewear.(e) Inspect sprockets for damaged teeth, cracks,distortion and other damage which would impair theiruse.(f) Check continuity of electrical leads and in-spect for cuts, damaged connectors and other evidenceof excessive wear.(g) Inspect panels, gaskets, and grommets onengine for cracks, tears, and hardening.(h) Inspect hydraulic pump, generator and otherparts for damage that would impair their use.(2) Repair.(a) Replace support, mounts, cooling duct, chaincase and chain cover if not repairable by welding.(b) Repair damaged threads with a threadchaser or replace threaded parts that are defective.(c) Replace damaged lead wires and connectors(fig 3-20).(d) Replace any other parts that are defective.d.1. Generator/Starter Brush Sanding Procedure.To seat the brushes sufficiently, and eliminate hard-s t a r t i n g p r o b l e m s , w h e nreplacingt h e g e n -erator/starter, or its brushes, sand the brushes accord-ing to the following procedure.(1) Remove generator/starter from the auxiliarypower unit (View U, fig 4-5).( 2 ) R e m o v e b r u s h g u a r d b a n d f r o m g e n -erator/starter.(3) Remove screw to brush lead wire.(4) Move aside brush retainer springs (View B, fig4-5.2) sufficiently to clear brushes. A screwdriver orstiff piece of wire bent into a hook shape can be used toaccomplish this.(5) Remove both brushes in any one brush set, andinsert a piece of sandpaper (about 2” wide and 180grit) beneath empty brush holder (View C).(6) Insert only one brush back into holder (ViewD), and while pressing down on top of the brush light-ly, move it back and forth in the holder, and againstthe sandpaper until the entire face of the brush issanded. This only requires about a dozen firm strokesof the brush against the sandpaper.(7) Replace brush set back into the brush holder.(8) Replace brush retainer springs on top of brush.(9) Replace brush lead wire using its respectivemounting screw.(10) Repeat (3) through (9) above for all six brushsets in the generator/starter.(11) Replace brush guard band.(12) Replace generator/starter onto auxiliarypower unit (View V, fig 4-5).e. Assembly. Assemble the auxiliary power unit inreverse order of disassembly, applying sealing com-pound (NSN 8030-00-543-4384) to all pipe threadsexcept swivel fittings. During assembly, apply siliconeR T V T y p e I a d h e s i v e s e a l a n t ( N S N 8 0 4 0 - 0 0 -225-4548) to gaskets, aline sprockets and tap or drillhole as required (fig 4 - 5).f. Tests and Adjustments.(1) General. All testing and adjusting of the auxil-iary power unit must be accomplished with the unitoutside the vehicle. A test stand (fig. 4-2) is required.Calibration of the current limiter is to be done in thevehicle. Refer to TM 9-2350-256-20.(2) Test outside vehicle.(a) Make sure that all lines, cables, accessoriesand other components are properly installed, tight-ened and adjusted. Fill chain case and crankcase to theproper levels (TM 9-2350-256-10) if required.(b) Using a ground cable assemblies and sevenhose assemblies provided for the test run outside thevehicle (table 2-1), fuel lines and hydraulic system asshown in figure 4-6.Change 84-19 (4-20 Deleted)
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