General Repair

TM 10-3930-633-34

guard other parts of the vehicle from

(1) Normal wear in excess of practical limits.

abrasive dust. The operation should not

(2) Pitting of teeth due to extreme pressure

be performed near exposed working

parts and all openings which would allow

(3) Abrasive wear due to foreign materials in

the dust to reach working parts should

lubricant.

be masked.

(4) Scoring, seizing, and galling of teeth due

to excessive loads and clearance.

d. Remove residue and oil stain from bearing

(5) Burning and loss of temper due to ex-

races with crocus cloth.

treme high temperature operation. Caused by

e. Prior to resurfacing, scrape off loose and

excessive friction and lack of lubrication.

blistered paint from damaged areas. Clean area to

(6) Rolling or plastic yielding due to extreme

be painted by sanding or buffing. Remove residue

loads over a long period.

cleaning material with paint thinner, Federal

Specification TT-T-306, and dry thoroughly.

(7) Cracks and fractures due to shock.

f. During repair operations, bare steel surfaces

NOTE

shall be protected from oxidation when not ac-

If visual inspection proves the service of gears

t u a l l y undergoing repair work, i.e., while

doubtful, perform a surface temper or magnetic

awaiting any repair step, re-inspection or

particle inspection, or both.

reassembly.

S u c h protection shall be ac-

e. Inspect shaft splines for wear, pitting,

complished by dipping the parts in, or spraying

rolling or peening, and for fatigue cracks. In

t h e m with corrosion preventive compound,

many instances, the same inspection procedure

Military Specification MIL-C-6259. The same

will apply as for gears. However, the condition, if

protective coating shall be applied to other

ever present, will in most cases be much less

metals, if necessary to prevent oxidation under

pronounced. When doubtful of the actual ser-

climatic or atmospheric conditions prevailing.

viceable condition of splines, perform a magnetic

Aluminum parts may require protection in at-

particle inspection.

mospheres having a high salt content. Steel parts

f. Check all hose surfaces for broken or frayed

must be protected in all instances.

fabric. Check for breaks caused by sharp kinks or

NOTE

rubbing against other parts of the truck. Inspect

The above instruction is applicable to polished and

copper tubing lines for kinks. Inspect the fitting

machined steel parts not protected by cadmium, tin,

threads for damage. Replace any part found

copper, or other plating or surface treatment. Bare

metal surfaces must be free of moisture when applied.

defective. Following reassembly and during

Acid present in perspiration and skin oils may attack

initial truck operation period, check for leaks.

steel surfaces if fingerprints are not removed. Dip

g. Visually inspect all castings and weldments

parts in fingerprint remover compound, Military

for cracks. Parts upon which great stress is placed

Specification MIL-C-15074, after handling, to prevent

such action.

may be inspected further, using the magnetic

particle inspection method. Critical non-ferrous

g. Welding and brazing processes may be

parts may be fluorescent penetrant inspected.

employed for the repair of cracks in external steel

h. Inspect all harnesses for chaffed or burned

p a r t s , such as brackets, panels, and light

insulation. Inspect all terminal connectors for

framework. Refer to paragraph 2-11 for specific

loose connections and broken parts.

welding instructions.

2-9. General Repair

h. Replace all broken, worn, or burned elec-

trical wiring. Wires on which several strands are

a. Remove burrs from gear teeth with a fine-

broken must be replaced. Broken strands will

cut file or hand grinder.

increase the resistance of the wire and impair

b. Alternator sliprings and starter com-

efficiency of the electrical components, especially

mutators may be polished in a lathe, using a strip

the ignition system.

of 00 sandpaper. After polishing, blow all dust

i. Replace all broken, frayed, crimped, or soft

and residue from commutator with compressed

flexible lines and hoses. Replace fittings which are

air.

stripped or damaged. Replace entire flexible hose

c. Chassis and exterior painted parts may be

if fittings are damaged. Make sure the hose

resurfaced where paint is damaged, or where

c l a m p s do not crimp hoses.

parts have been repaired, by using an abrasive

j. Replace any bolt, screw, nut, or fitting on

disc driven through a flexible shaft.

which threads are damaged. Inspect tapped holes

CAUTION

for thread damage. If cross-threading or spalling

Suitable precautions should be taken to

2-9