Table 2-1. Troubleshooting Chart - Continued
Malfunction
Probable cause
Corrective action
d. Defective ring or pinion
d. Replace gears (TM 5-3810-232-12).
gears
14. Continuous Humming
a. Defective wheel bear-
a. Replace defective wheel bearing. Adjust as per para
Noise or Noisy Axle
ings
When Driving
b. Lack of lubrication or
b. Check lubricant for correct amount and grade in lu-
use of improper grade
brication order.
of lubricant in univers-
al joints, wheel bear-
ings
c. Broken axle
c. Replace axle (para 5-18).
d. Worn or broken
d. Replace gears (para 5-18).
differential or pin-
ion gears
e. Worn or broken differ-
e. Replace bearings (para 5-18).
ential or pinion bear-
ings
f. Worn pinion gear or
f. Replace pinion and ring gear/bearing as required.
pinion gear bearings.
15. Carrier Has No Brake
a. Improper brakeshoe ad-
a. Adjust brakeshoes (TM 5-3810-232-12).
Action, Insufficient
justment
Action or Brake
b. Worn brake linings
b. Adjust for lining wear or replace brakeshoes or lin-
Apply Slowly
ings (para 5-20).
c. Blocked, bent or broken
c. Remove obstruction in line or replace faulty tubing
tubing or hose (TM 5-3810-232-12).
d. Brake valve delivery
d. If brake valve is defective, replace unit (TM 5-3810-
pressure below normal 232-12).
e. No air pressure
e. Replace or repair air compressor (para 3-25).
16. Brake Release Too
a. Insufficient brakeshoe
a. Adjust brakeshoes if clearance is insufficient (TM
Slowly With Pedal
clearance
5-3810-232-12).
Released
b. Weak or broken valve
b. Replace brake valve (TM 5-3810-232-12).
diaphragm return
spring
c. Defective quick release
c. Replace quick release valve (TM 5-3810-232-12).
valve
17. Brakes Grab When
a. Brakeshoe clearance too
a. Adjust clearance (TM 5-3810-232-12).
Pedal is Depressed great
b. Grease or oil on linings
b. Clean linings or replace brakeshoes or linings (para
c. Drums out-of-round
c. Replace drums (para 5-18)
d. Defective brake valve
d. Replace faulty unit (TM 5-3810-232-12).
e. Brakes need relining
e. Replace brakeshoes (para 5-20).
f. Brake chamber dia-
f. Tighten all fittings. If caused by broken or faulty unit,
phragm leaks
replace brake chamber (TM 5-3810-232-12).
18. Carrier Transmission
a. Insufficient or improper
a. Fill to level with proper lubricant as specified in lu-
Excessively Noisy in
lubricant.
brication order.
Operation
b. Unit out of line
b. Tighten all mountings securely.
c. Loose transmission
c. Tighten or replace bolts (para 5-9, 5-10).
mounting bolts
d. Defective gears
d. Replace gears (para 5-10).
e. Defective bearings
e. Replace bearings (para 5-10).
f. Defective spline shaft-
f. Replace spline shaft (para 5-10).
19. Fan drive hydraulic
a. System leakage loose
a. Inspect and tighten port connections and lines.
motor fails to start
port connections or
(Model 2385)
broken lines
b. No fluid-inadequate
b. Check fluid level in reservoir. Replenish as necessary.
fluid supply at inlet
or in system
c. System return line or
c. Check drain filter. Clean and/or replace filter element.
drain line restricted
d. System inlet line re-
d. Check all strainers and filter for dirt and sludge.
stricted Clean if necessary.
2-3
