Harrington Hoists and Cranes Static/Dynamic Hoist Load Tester - Manual (Page 17)

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3. SYSTEM OPERATES SLOWLY
• Oil viscosity too high, cold oil Allow oil to warm up before operating
machine.
• Low oil level Check reservoir and add oil as necessary.
• Air in system Check suction side for leaks. Repair.
• Badly worn pump, valves, cylinders, etc. Repair or replace as needed.
• Restriction in filters or lines Clean and/or replace elements or lines.
• Improper adjustments Check orifices, relief valves, etc. Adjust
per manual.
• Oil leaks Tighten fittings. Replace seals or damaged
lines.
4. SYSTEM OPERATES TOO FAST
• Wrong size or incorrectly adjusted Replace or adjust as necessary.
restrictor
5. OVERHEATING OF OIL IN SYSTEM
• Oil passing through relief valve for Return control valve to neutral when not
excessive time in use.
• Incorrect oil, low oil, or dirty oil Use recommended oil. Fill reservoir, clean
oil, replace filter element.
• Excessive component internal leakage Repair or replace component as necessary.
• Restriction in filters or lines Clean and/or replace elements or lines.
• Insufficient heat radiation Clean dirt and mud from reservoir and
components.
• Malfunctioning component Repair or replace.
6. FOAMING OF OIL
• Incorrect, low or dirty oil Replace, clean or add oil as needed.
• Air leaks Check suction line and component seals for
suction leaks. Replace.
7. NOISY PUMP
• Low oil level, incorrect oil, foamy oil Replace, clean or add oil as needed.
• Suction line plugged, inlet screen Clean or replace.
plugged
• Worn or damaged pump Repair or replace