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Page Title:
Direct and General Support Preventive Maintenance Services |
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 50 hour
100 hour
x
Tighten any loose bolts and retest. If low compression or a variation in compression
persists, the trouble lies with the cylinder head gasket, valves, or piston rings.
Correct all deficiencies.
x
x
x
Electrical System Magneto. Inspect the ignition magneto for loose mounting bolts and
wiring connections. Correct any deficiencies noted.
x
x
Remove the end cap and inspect the distributor cap for cracks, and corroded terminals.
Examine the breaker point gap. The correct gap is 0.015 inch at full separation of
points.
x
x
x
Spark plugs. Inspect the spark plugs for looseness, bad connections, and dirty or broken
x
x
Replace damaged spark plugs (par. 114). Clean dirty plugs and set the gap to 0.0300
inch (par. 114).
x
x
x
Generator and starter. Inspect the mounting of the generator and starting motor for
loose connections. Examine the brushes, brush holders and springs. Inspect the
commutators for dirt and scoring.
x
x
Tighten loose mounting bolts. Replace generator brushes worn to one half their original
length (par. 112). Replace starter brushes worn to one half their original length
x
x
x
Engine generator regulator. Inspect the generator regulator for proper operation,
tight connections, and secure mounting. The generator regulator should allow an
appreciable charge to go into the battery after the starter is used. After the battery
is fully charged, the ammeter should read only a slight charge.
x
x
Tighten loose mounting nuts and connections. Adjust or replace a defective engine
generator regulator (par. 111).
CONTROL PANEL
x
x
x
Gages. Examine the condition of all gages. See that all gages indicate correctly and
that the glass is not cracked or broken.
x
x
Tighten loose mounting screws and connections. Replace any defective or damaged gage.
x
x
x
Meters. See that all meters are securely mounted and operating properly and that the
glass is not cracked or the indicators are not bent or broken.
x
x
Tighten loose mounting screws and replace any defective or damaged meter.
x
x
x
Control valves. Inspect all control valves for packing leaks and proper operation. Sec
that handwheels are securely mounted.
x
x
Tighten packing or replace as required. Replace a defective or damaged control valve.
RUNNING GEAR
x
x
x
Tires. Inspect all tires for under inflation, abnormal or uneven wear, cuts, embedded
foreign matter, and missing valve caps.
x
x
Remove any foreign matter from tires. See that tires are inflated to correct pressure
and all valve caps are in place.
x
x
x
Wheels. Inspect for loose wheel mounting bolts. Inspect wheel bearings for proper
adjustment.
x
x
Tighten loose wheel bolts and adjust wheel bearings as required (par. 163).
x
x
x
Axles. Inspect the axle assemblies for secure mounting and proper alinement. Inspect
the springs for cracks, breaks and weakened condition.
x
x
Tighten all axle mounting bolts. Aline the front wheels as required (par. 163). Replace
defective springs (par. 164).
x
x
x
Brake assembly. Inspect the brake assembly for correct adjustment. Inspect the cables
for secure mounting.
x
x
Tighten all brake assembly mounting bolts and adjust the brakes (par. 76).
H Y D R A U L I C SYSTEM
x
x
x
Hydraulic pump. Inspect the hydraulic pump for loose mounting bolts and hydraulic
connections. See that the drive coupling is securely mounted and alined.
32
AGO 5742A
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