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5-4 BRAKE DRUMS
For maintenance procedures, see
See Sections 4-8.
SYMPTOM
PROBLEM: REMEDY
EXCESSIVE LOSS OF BRAKES
OR FADING
Overheated brake drums:
check for defective or misadjusted
brake linings, distorted or over-machined drums. Also check for
operating conditions or loads that create severe or excessive
brake applications.
BRAKES PULL TO EITHER SIDE
Drums of different diameters:
replace with drums of same di-
ameter.
Foreign matter in drums:
clean drums out.
ROUGH OR NOISY BRAKING AC-
TION
Defective drums:
pull drums and inspect for any of the follow-
ing; Heat spotted drums, grease spotting, blue drums, scored
drums, excessive wear at rivet holes or edges, polished drums,
out of round drums, unbalanced drums, worn/damaged brake
components, foreign matter in drums. Correct situation or re-
place defective part(s).
VIBRATION IN RIDE
Defective drums or out-of-round:
replace drums.
Out-of-balance drums:
balance drums.
5-5 HYDRAULIC SYSTEM
Most hydraulic system failures follow the same pattern: a gradual or sudden loss of pressure or
flow with a resulting loss of cylinder or motor power. Any one of the system’s components may be at
fault. By following step-by-step procedures, the trouble can be located in a short time.
SYMPTOM
PROBLEM: REMEDY
SEMITRAILER LOCKED IN
TILTED POSITION
Velocity fuse activated:
raise the trailer slightly (to reset the
velocity fuse), then lower the trailer slowly.
SYSTEM INOPERATIVE
Not enough oil in system:
fill, check for leaks.
Wrong oil in system:
change oil, see specifications.
Filter dirty or clogged:
drain oil and replace filter.
Hydraulic lines dirty or collapsed:
clean or replace as neces-
sary.
Air leaks in pump suction line:
repair or replace as neces-
sary.
Worn or dirty pump: clean, repair or replace.
Check for con-
taminated oil. Drain and flush.
Badly worn components:
examine for internal leakage. Re-
place faulty components. Check for cause of wear.
Leakage:
check all components, and relief valve for proper set-
tings.
Excessive load:
check unit specifications for load limits.
Slipping or broken pump drive:
repair or replace couplings.
Check for alignment.
5-6
Содержание 330B
Страница 3: ...MODEL 330B SEMITRAILER OPERATOR S MANUAL PURCHASED FROM DATE ADDRESS PHONE NO SERIAL NO i ...
Страница 8: ......
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Страница 20: ...3 8 Figure 3 3 Steps for Loading and Unloading ...
Страница 26: ...3 14 Figure 3 7 Rear Impact Guard System ...
Страница 34: ...4 6 Figure 4 2 330B Wiring Diagram ...
Страница 35: ...4 7 Figure 4 3 Remote Wiring Diagram ...
Страница 40: ...4 12 Figure 4 6 Examples of Camber Figure 4 7 Checking Axle for Bend ...
Страница 44: ...4 16 Figure 4 11 Axle and Brake Assembly ...
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Страница 63: ...NOTES 5 9 ...
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