SERVICE
800D
5-26
Published 5-27-2018 Control # 039-06
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
No response to
control
• Load too heavy.
• PTO not engaged.
• Low hydraulic fluid supply.
• Suction line blocked.
• Broken hydraulic pressure line.
• Defective hydraulic pump.
• Incorrect relief valve setting.
• Relief valve sticking.
• Check Capacity Chart.
• Engage PTO.
• Check and fill as required.
• Drain tank and hose and remove blockage.
• Replace as required.
• See Pump Service Manual.
• Adjust relief.
• Clean relief.
Poor hydraulic
system
performance
• Pump not operating at proper speed.
• Low hydraulic fluid supply.
• Relief valve sticking.
• Relief setting too low.
• Worn pump, motor or cylinder.
• Plugged filter.
• Valve spools not fully open.
• Boom holding valves out of adjustment.
• Oil temperature too high.
• Hydraulic oil too cold or dirty.
• Line restricted.
• Internal control valve crack.
• Load too heavy.
• Check PTO ratio, pump size and engine speed for
proper oil flow.
• Check and fill as required.
• Remove and clean.
• Readjust to proper setting.
• Replace bad part.
• Change filter.
• Adjust linkage so valve has full throw.
• Adjust or clean as required.
• Reduce engine speed, slow cycle time to cool oil
or add oil cooler option.
• Warm oil or use less viscous oil.
• Check lines; clean and repair as necessary.
• Replace valve.
• Check Capacity Chart and reduce load.
Swing moves
erratic or
loosely
• Loose turntable bearing.
• Loose swing gearbox mounting bolts.
• Worn gears or bearing.
• Operator control of lever too erratic.
• Motor counterbalance valves dirty or not set
properly.
• Brake not holding properly.
• Brake releasing at wrong time or erratically.
• Torque bearing mounting bolts.
• Tighten bolts.
• Replace worn parts or adjust gearbox spacing.
• Operate controls smoothly.
• Clean or replace counterbalance valves not set at
600 psi.
• Check for no pressure in brake pilot line when turn
is in neutral.
• Replace worn brake parts or shim brake to proper
torque.
• Bleed air from brake with bleed screw on side of
brake.
Fo
r
Reference
Only
Содержание National Crane 800D
Страница 1: ...Operator and Service Manual National Crane 800D F o r R e f e r e n c e O n l y ...
Страница 4: ...F o r R e f e r e n c e O n l y ...
Страница 98: ...MAINTENANCE 800D 3 10 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 194: ...SPECIFICATIONS 800D 8 4 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 216: ...INSTALLATION 800D 9 22 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 232: ...CRANE INSTALLATION 800D 10 16 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 252: ...SCHEMATICS 800D 2 Published 5 27 2018 Control 039 06 F o r R e f e r e n c e O n l y ...
Страница 255: ...F o r R e f e r e n c e O n l y ...
Страница 256: ...F o r R e f e r e n c e O n l y ...