Table 4-1. Preventive Maintenance Checks and Services--Continued
Semiannual schedule
Organizational maintenance category
Sequence
Number
Item to be Inspected
Procedure
Para Reference
9
Wheel bearings w i l l be disassembled, cleaned and
WHEEL BEARINGS
4-9
repacked during every other semi-annual inspection. If
wheel bearings are due for repacking, remove wheels
a n d hubs and make observation of brake internal
components. Adjust brakes.
Inspect these items. Give particular attention to landing
10
FRAME, ATTACHMENTS
AND PAINT
leg, observe condition of paint, legibility of markings
and data plates. Tighten spring U-bolts and leaf clips.
LUNETTE
AND
SAFETY
Inspect lunette and safety chains, give particular at-
4-21, 4-22
11
tention to security of mounting.
CHAINS
12
Investigate and correct or report any discrepancies noted
MAINTENANCE
4-3, 4-4
DISCREPANCIES
during the inspection.
Wash interior and exterior of vehicle.
13
CLEAN
3-5
Lubricate vehicle in accordance with lubrication chart.
14
LUBRICATE
3-1
Coordinate with inspection and disassembly operator
to avoid duplication.
15
Perforrn final road test: give special attention to items
FINAL ROAD TEST
w h i c h were repaired and where adjustments were
made.
Section IV. TROUBLESHOOTING
1-5. General
that may be encountered in the vehicle or in in-
dividual units or systems of the vehicle. Each
b. The tests and remedies provided in Table 4-2
malfunction is followed by a list of probable causes
are governed by the scope of organizational level of
(tests) that must be considered in determining the
maintenance. The malfunctions, probable causes.
corrective action (remedy). Probable causes are
and corrective action that can be performed by the
listed in their order of probability, and should be
using organization are listed in Table 4-2.
considered in that manner during troubleshooting.
4-6. Procedures
Table 4-2 lists possible malfunctions (symptoms)
Table 4-2. Organizational Troubleshooting
Corrective Action
Malfunction
Probable Cause
BRAKES
a.
Brake shoe improperly adjusted.
1. Trailer pulls hard.
b.
Weak broken or missing return
20).
spring.
a.
Brake lining to drum clearance
2. No brake effect.
too great.
b.
Brake linings greasy or dirty.
c. Brake linings worn out.
c. Replace shoes (same as above).
d. B r a k e c a b l e d i s c o n n e c t e d o r
d. Connect or replace cable (para 1-
18).
broken.
e. Cable too loose.
f. Hand lever disconnected or broken.
f. Connect, replace or repair hand
lever (para 4-18, 4-19, 4-20).
A X L E , WHEEL AND TIRES
a. I m p r o p e r w h e e l b e a r i n g a d -
3. Wheel wobbles.
justment.
b.
Replace (para 4-8).
b. Damaged bearings.
c.
Replace (para 4-7, 4-8).
c. Bent wheel.
a.
Adjust (para 4-7).
4. Abnormal or uneven tire wear.
a. Loose wheel bearings.
b.
Replace (para 4-26).
b. Bent wheel.
c.
Realign (para 4-8, 4-9, 4-10).
c. Axle out of line.
a.
Tighten or replace (para 4-11).
a. Loose or broken U-bolts.
5. Axle loose or out of line.
b.
Replace (para 4-11).
b. Bent or broken spring shackle
plate.
c. Replace (para 4-13).
c. Bent or broken spring hanger.
d. Replace (para 4-8, 4-9, 4-10).
d. Axle bent.
4-2
