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
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.
SYSTEM OPERATES ERRATIC-
ALLY
Air in the system:
check suction side of system for leaks. Re-
pair leaks.
Cold oil:
allow ample warm-up time. Use proper weight oil
for operating temperature.
Dirty or damaged components:
clean or repair as needed.
Restriction in filters or lines:
clean and/or replace filter or
lines.
Not enough oil in system:
fill and check for leaks.
SYSTEM OPERATES SLOWLY
Oil viscosity too high, or “cold oil”.
Allow oil to warm up
before operating.
Low pump drive speed:
increase engine speed (check pump
owners manual for specifications).
Low oil level:
check reservoir and add oil as necessary.
Air in system:
check suction side for leaks. Repair leaks.
Badly worn pump, valves, cylinders, etc.:
repair or replace
faulty
component(s) as necessary.
Restrictions in lines or filter:
clean and/or replace filter or
lines.
Improper adjustments:
check orifices, relief valves, etc.
Adjust as necessary.
Oil leaks:
tighten fittings. Replace seals, gaskets and dam-
aged lines.
SYSTEM OPERATES TOO FAST
Wrong size or incorrectly adjusted restrictor:
replace or
adjust as necessary.
Engine running too fast:
reduce engine speed.
5-6
Summary of Contents for 345B
Page 3: ...MODEL 345B TRAILER OPERATOR S MANUAL PURCHASED FROM DATE ADDRESS PHONE NO SERIAL NO ...
Page 8: ......
Page 12: ......
Page 22: ...3 10 Figure 3 4 Steps for Loading and Unloading ...
Page 26: ...3 14 Figure 3 7 Rear Impact Guard and Antilock Brake System ...
Page 30: ......
Page 35: ...4 5 Figure 4 2 345B Wiring Diagram ...
Page 36: ...4 6 Figure 4 3 Remote Wiring Diagram ...
Page 41: ...4 11 Figure 4 5 Examples of Camber Figure 4 6 Checking Axle for Bend ...
Page 46: ...4 16 Figure 4 10 Axle and Brake Assembly ...
Page 50: ...4 20 Figure 4 13 Outboard Mount Hub and Drum Figure 4 14 Inboard Mount Hub and Drum ...
Page 54: ...4 24 Figure 4 18 Mounting Tires and Wheels Figure 4 19 Stud Tightening Sequence ...
Page 65: ...5 9 NOTES ...
