GENERAL REPAIR.

as for gears. However, the condition, if ever

b. Inspection consists of checking for defects

will in most cases be much less

present,

such as physical distortion, wear, cracks, and

When doubtful of the actual

pronounced.

pitting, and checking dimensions of parts for

s e r v i c e a b l e condition o f s p l i n e s , p e r f o r m a

compliance with maximum wear limits data. Parts

magnetic particle inspection.

subjected to heavy load or pressure shall be

inspected more thoroughly by performing surface

f. Check all hose surfaces for broken or frayed

temper, magnetic particle, or fluorescent penetrant

fabric. Check for breaks caused by sharp kinks or

procedures where necessary. Clean all parts before

rubbing against other parts of the truck. Inspect

inspection.

copper tubing lines for kinks. Inspect the fitting

threads for damage. Replace any part found

c. When removing drain plugs from transmission,

defective. Following reassembly and during initial

engine, or hydraulic system components, inspect

truck operation period, check for leaks.

the sediment adhering to the plug. Accumulations

o f grit and/or fine metal particles may indicate

g. Visually inspect all castings and weldments for

actual or potential component failure. A few fine

cracks. Parts upon which great stress is placed may

particles are normal. This inspection is effective in

be inspected further, using the magnetic particle

determining defective parts prior to internal

inspection method. Critical non-ferrous parts may

inspection of the component, and to predict

be flourescent penetrant inspected.

degradation of the equipment.

h . Inspect all harnesses for chaffed or burned

d. Gears should be inspected upon removal for

insulation. Inspect all terminal connectors for loose

the following conditions:

connections and broken parts.

1. Normal wear in excess of practical limits.

5-6. GENERAL REPAIR.

2. Pitting of teeth due to extreme pressure

a. Remove burrs from gear teeth with a fine-cut

file or hand grinder.

3 . Abrasive wear due to foreign materials in

b. Alternator slip rings and

starter commutators

lubricant.

m a y be polished in a lathe,

using a strip of 00

sandpaper. After polishing,

blow all dust and

4. Scoring, siezing, and galling of teeth due to

residue from commutator with

compressed air.

excessive loads and clearance.

c . Chassis and exterior painted parts may be

5. Burning and loss of temper due to extreme

resurfaced where paint is damaged, or where parts

high temperature operation. Caused by excessive

have been repaired, by using an abrasive disc driven

friction and lack of lubrication.

through a flexible shaft.

6 . Rolling or plastic yielding due to extreme

loads over a long period.

7. Cracks and fractures due to shock-loading.

S u i t a b l e precautions should be taken to

guard other parts of the vehicle from

Note

abrasive dust. The operation should not be

performed near exposed working parts and

If visual inspection proves the service of

all openings which would allow the dust to

gears doubtful, perform a surface temper or

reach working parts should be masked.

magnetic particle inspection, or both.

e. Inspect shaft splines for wear, pitting, rolling

d . Remove residue and oil stain from bearing

or peening, and for fatigue cracks. In many

races with crocus cloth.

instances, the same inspection procedure will apply

5-3