TM-9-2320-272-23-5
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 5 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-5 - Page 401 of 623
GENERAL CLEANING INSTRUCTIONS - Continued
WARNING
Eyeshields must be worn when cleaning with a wire brush. Flying rust and metal particles
may cause injury to personnel using a wire brush. Failure to comply may result in injury or
death to personnel.
11.
Mated Surfaces.
Remove old gasket and/or sealing compound using wire brush and solvent
cleaning
compound.
12.
Rusted Surfaces.
Clean all rusted surfaces using wire brush and crocus cloth.
13.
Oil-bathed Internal Parts.
Wipe clean with lint-free cloth.
14.
Air-actuated Internal Parts.
Wipe clean with lint-free cloth.
15.
External Exposed Parts.
Wash with soap and water. Rinse thoroughly and air-dry.
GENERAL INSPECTION INSTRUCTIONS
1.
Procedures for inspections will be the same for many parts and components which make up the vehicle
subassemblies. General procedures are detailed in Steps (2) through (16). Dimensional standards for parts
have been fixed at extremely close tolerances, so use specification tables. Use specified inspection equipment
for inspection where cracks and other damage cannot be spotted visually. Exercise extreme care in all phases
of inspection.
2.
Castings.
a.
Inspect all ferrous and nonferrous castings for cracks using a magnifying glass and strong light.
b.
Refer to MIL-L-6866, Inspection, Liquid Penetrant Methods, and MIL-L-6868, Inspection Process,
Magnetic Particles.
c.
Particularly inspect areas around studs, pipe plugs, threaded inserts, and sharp corners. Replace all
cracked castings.
d.
Inspect machined surfaces for nicks, burrs, or raised metal. Mark damaged areas for repair
or
replacement.
e.
Inspect all pipe plugs, pipe plug openings, screws, and screw openings for damaged or stripped threads.
Replace or repair damaged or stripped threads.
f.
Using a straightedge or surface plate, check all gasket mating surfaces, flanges on housings, and
supports for warpage. Inspect mating flanges for discolorations which may indicate persistent oil leakage.
Replace damaged parts.
g.
Check all castings for conformance to applicable repair standards. Replace damaged castings.
3.
Bearings.
Refer to TM 9-214 for inspection of bearings. Check all bearings for conformance to applicable
standards.
4.
Studs, Bolts, and Screws.
Replace if threads are damaged, bent, or stripped.
5.
Gears.
a.
In strong light, inspect all gears for cracks. No cracks are allowed.
b.
Inspect gear teeth for wear, sharp edges, burrs, and galled or pitted surfaces.
TM 9-2320-272-23-5
0819
0819-4
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