Harrington Hoists and Cranes Static/Dynamic Hoist Load Tester - Manual (Page 16)

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3.3 Trouble Shooting Tips
FINDING AND SOLVING PROBLEMS:
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.
1. SYSTEM INOPERATIVE
• No oil in system, insufficient oil in Fill system. Check for leaks.
system
• Wrong oil in system Refer to specifications. Change oil.
• Filter is dirty or clogged Drain oil and replace filter or filter
element.
• Oil line restriction Oil lines are dirty or collapsed. Clean
or replace.
• Air leaks in pump suction line Repair or replace as necessary.
• Worn or dirty pump Clean, repair or replace. Check
alignment. Check for contaminated oil.
Drain and flush system.
• Badly worn components (valves, Examine and test for internal or external
cylinders, etc.) leakage. Replace faulty components.
Check for cause of wear.
• Leakage Check all components, particularly the
relief valve for proper settings. Refer to
technical manuals.
• Excessive load Check unit specifications for load limits.
• Slipping or broken pump drive Repair or replace belts, couplings, etc.
Check for proper alignment or tension.
2. SYSTEM OPERATES ERRATICALLY
• Air in system Check suction side of system for leaks.
Repair.
• Cold oil Allow ample warm-up period.
• Dirty or damaged components Clean or repair as necessary.
• Restriction in filters or lines Clean and/or replace elements or lines.