Manitowoc National Crane 600E-2 User Manual

National Crane PUBLISHED 04-26-2019 CONTROL # 113-09 6-7
600E2 OPERATOR MANUAL MAINTENANCE CHECKLIST
6
HYDRAULIC SYSTEM TROUBLE
DIAGNOSIS
The following chart lists malfunctions which may occur
during equipment operation, followed immediately by
possible cause and possible solution. These are not all
inclusive but are designed to help isolate the problem and
should be checked before calling the factory Service
Department
Condition Possible Cause Possible Solution
Truck engine will not start
Emergency stop switch on crane control
console depressed.
Pull up emergency stop switch.
Check all other normal motor vehicle
systems as outlined by normal practice.
No response to control
Overload system inoperative.
Insure overload system is working properly
and Anti-Two-Block/Overload solenoid is
powered.
Load too heavy. Check load chart.
PTO not engaged. Engage PTO.
Low hydraulic fluid supply. Check and fill as required.
Suction line blocked. Drain tank and hose and remove blockage.
Broken hydraulic pressure line. Replace as required.
Defective hydraulic pump. See Pump Service Manual.
Incorrect relief valve setting Adjust relief.
Relief valve sticking. Clean relief.
Poor hydraulic system performance
Pump not operating at proper speed.
Check PTO ratio, pump size and engine
speed for proper oil flow.
Low hydraulic fluid supply. Check and fill as required.
Relief valve sticking. Remove and clean.
Relief setting too low. Readjust to proper setting.
Worn pump, motor or cylinder. Replace bad part.
Plugged filter. Change filter.
Valve spools not fully open. Adjust linkage so valve has full throw.
Boom holding valves out of adjustment. Adjust or clean as required.
Oil temperature too high.
Reduce engine speed, slow cycle time to
cool oil or add oil cooler option.
Hydraulic oil too cold or dirty. Warm oil or use less viscous oil.
Line restricted. Check lines; clean and repair as necessary.
Internal control valve crack. Replace valve.
Load too heavy. Check load chart and reduce load.
Fo
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Reference
Only

Manitowoc National Crane 600E-2 Specifications

General

Brand	Manitowoc
Model	National Crane 600E-2
Category	Construction Equipment
Language	English