8-22
Published 01-29-2014, Control # 496-00
UNDERCARRIAGE TMS800E SERVICE MANUAL
Table 8-2Troubleshooting
Symptom Probable Cause Solution
1. Brakes are poor or do not apply. a. Insufficient air pressure. a. Check for the correct pressure
at the compressor and brake
air chambers.
b. Restriction or leak in lines,
valves, etc.
b. Check all lines, valves, etc.,
for leaks or restrictions.
c. Brakes out of adjustment. c. Adjust the brakes.
d. Leaking diaphragm. d. Replace the diaphragm.
2. Uneven braking or uneven lining
wear.
a. Ruptured diaphragm. a. Replace the diaphragm.
b. Brakes out of adjustment. b. Adjust the brakes.
c. Grease on the lining. c. Replace the lining.
d. Glazed lining. d. Replace the lining.
e. Shoes installed backwards. e. Reverse the shoes.
f. Combination linings. f. Remove the linings and
replace with the correct style.
3. Adjusted stroke is too long and no
adjustment
a. Clevis installed at wrong angle a. Install clevis correctly
b. Excessive wear between
clevis and collar
b. Replace clevis
c. Loose jam nut at clevis c. Tighten to specification
d. Worn clevis pin bushing in
slack arm.
d. Replace bushing
e. Weak or broken return spring
in air chamber
e. Replace return spring or air
chamber
f. Spring brake does not retract
fully.
f. Repair or replace spring
brake.
g. Worn or stripped teeth on
pawl or actuator.
g. Replace slack adjuster
h. Excessive looseness between
splines of camshaft.
h. Replace powershaft, gear or
automatic slack adjuster as
needed.
i. Worn components in brake. i. Replace worn component.
4. Adjusted stroke is too short or
linings drag.
a. Clevis
inst
alled at wrong
angle.
a. Install clevis correctly.
b. Loose jam nut at clevis. b. Tighten to specification.
c. Spring brake does not retract
fully.
c. Repair or replace spring
brake.
d. Wrong brake adjustment d. Adjust brake
e. Poor contact between linings
and drum, or drum is out-of-
round.
e. Repair or replace drums or
linings.
f. Brake temperature imbalance f. Correct brake balance.
Reference Only
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