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DUMP BODY WILL NOT LOWER - TM-9-2320-272-24-10180
ELECTRICAL SYSTEM TROUBLESHOOTING - TM-9-2320-272-24-10182

TM-9-2320-272-24-1 Truck 5-Ton 6x6 M939 M939A1 M939A2 Series Trucks (Diesel) Manual
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TM 9-2320-272-24-1
Table 2-2. Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Visually check to see if top side panel is too far out to engage edge of roof.
Place heavy block of wood against flat surface of seal retainer, opposite locking bar at top of
side panel. Strike block with heavy hammer.
END OF TESTING!
85. VAN BODY NOT WATERPROOF OR LIGHTTIGHT
step 1. Visually inspect lower part of side panel for tightness against van body.
Place heavy block of wood (2 in. x 4 in., or 4 in. x 4 in.) against rub rail at end of side panel
where leaks occurs. Strike block with heavy hammer.
step 2.  Check for sagging end panel.
Add rubber seal material (appendix D, item 632) to seal on outer edge of hinged roof until
seal meets top edge of panel door.
step 3. Check lip of block seal at inner rear corner of hinge roof to see if it is out of position.
Move side panel out to disengage corner block seal. Push seal lip up into correct position so
end panel door properly engages seal when side panel is retracted.
step 4.  Check for loose or worn seal at top of rear doors.
If worn, recover worn or loose area with sealing material (appendix D, item 632).
END OF TESTING!
86. DOOR LOCK WILL NOT OPERATE
Step 1.  Check for jammed lock bolt.
If lock bolt is jammed, repair lock assembly (para. 3-364).
Step 2.  Check alignment of lock bolt to striker plate.
Add or remove shims behind lock until bolt properly engages striker plate (para. 3-364).
END OF TESTING!
87. HEATER WILL NOT IGNITE
Check electrical system (Electrical Troubleshooting, para. 2-22).
END OF TESTING!
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