DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
2-11. GENERAL. This section contains
general repair methods and cleaning proce-
dures. Special repair and cleaning procedures
are provided, as required, in the individual
2-12. REPAIR METHODS.
Complete disassembly is not always neces-
sary to make a repair. Exercise good judg-
ment to keep disassembly and assembly to
Repair or replace unserviceable parts and
hardware. Always replace preformed pack-
ings, gaskets, seals, and cotter pins with
Remove burrs with a stone or file. Remove
burrs on closely fitted mating surfaces by
lapping the surfaces with lapping grinding
compound (item 11, appx B).
Remove corrosion or rust with sandblasting,
vapor blast cleaning, or crocus cloth (item
3, appx B). Use the method that will not
damage the surface being cleaned. Crocus
cloth should be used to remove corrosion
and rust from polished surfaces. Make sure
that critical dimensions are not changed
when using crocus cloth.
Repair damaged threads with a thread chas-
er, or by chasing in a lathe or die.
When welding is authorized, procedures in
TM 9-237 must be followed. Welds must
be inspected for cracks.
Bearings should be inspected and main-
tained per TM 9-214.
2-13. TORQUE VALUES. Follow torque
values given throughout this manual. When no
torque value is given, follow the torque limits
guide, provided in appendix D of this manual,
to prevent damaged parts. The guide is based
on using clean, dry threads.
1 Wire brush metal
parts to remove rust and
Dry cleaning solvent (SD2) is toxic
and flammable. Wear protective
goggles and gloves and use only in
well ventilated areas.
Clean metal parts with dry cleaning sol-
vent (item 5, appx B). Metal or fiber
brushes may be used to apply cleaning
solvent and to remove softened or dis-
solved material. Hand scraping with metal
scrapers may be used to remove soft
coatings or deposits.
Soak very oily or greasy metal parts in a
tank containing dry cleaning solvent (item
5, appx B). The time parts must be in sol-
vent varies with the type and amount of
material to be removed.
Do not use solvent to clean electrical in-
sulation, wires, cables, or wiring har-
nesses. Clean these parts by wiping with
a damp cloth. Use a mild soap solution if
necessary. Dry immediately with clean,
dry cloths. Clean contact points with flint
abrasive paper (item 8, appx B) and dust
thoroughly after cleaning.
Do not use solvent to clean rubber parts.
Clean rubber parts by washing with mild
solution of soap and water.
Dry parts by blowing with low-pressure
compressed air or wiping with clean lint-
free cloths (item 4, appx B).
Bearings should be cleaned according to
procedures in TM 9-214.