5-4 BRAKE DRUMS
For maintenance procedures see
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
Summary of Contents for 317C
Page 8: ......
Page 14: ...3 2 Figure 3 1 Front Trailer Terminology Figure 3 2 Rear Trailer Terminology...
Page 18: ......
Page 24: ...3 12 Figure 3 5 Steps for Loading and Unloading...
Page 30: ...3 18 Figure 3 10 Dock Leveler Operation...
Page 34: ...3 22 Figure 3 12 Front Extension Bulkhead...
Page 36: ...3 24 Figure 3 13 Rear Impact Guard and Antilock Brake System...
Page 40: ...4 2 Figure 4 1 Lubrication Points...
Page 45: ...4 7 Figure 4 2 317C 318C 319C Wiring Diagram...
Page 46: ...4 8 Figure 4 3 Remote Wiring Diagram...
Page 52: ...4 14 Figure 4 6 Checking Axle Alignment Figure 4 7 Examples of Camber...
Page 56: ...4 18 Figure 4 10 Axle and Brake Assembly...
Page 64: ...4 26 Figure 4 16 Mounting Tires and Wheels Figure 4 17 Stud Tightening Sequence...
Page 67: ...4 29 Figure 4 18 Dock Leveler Leg Assembly...
Page 68: ......
Page 78: ...5 10 NOTES...
