Manitowoc Published 10-01-2012, Control # 045-08 10-5
777 SERVICE MANUAL TROUBLESHOOTING
10
Problem 3
Engine runs, but no hydraulic operation.
POSSIBLE CAUSES
Clutch not engaged; No hydraulic fluid in tank; Blocked charge inlet to pumps; Clogged tank vent;
Drive train damaged from flywheel to pump mount.
CHECKS
Check hydraulic filter service shut-off valve.
Ok
Not Ok
Check clutch engagement.
Open filter service shut-off valve or
replace filters if necessary.
Clutch Engaged Clutch not Engaged
Engage clutch.
Remove tank cap and check vent, fluid level, and viscosity. In extreme cold
conditions, oil may not flow freely to pump inlets causing pump cavitation.
Tank Vent, Oil Level, Viscosity Ok
Not Ok
Service hydraulic system.
Check manual override on two or more pumps. Does engine load
when manual override is applied? Make sure all brakes are applied
and swing lock is in place. (See Test 11.)
Pump Loads Pump does not Load
Check electrical input from
controller to pump. (See Test 17.)
Consult
dealer/factory.
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