MAINTENANCE CHECKLIST OPERATOR MANUAL 500E2
6-10 Published 07-26-2019 Control # 111-06
Hoist will not lift or hold load
Load too heavy.
Check load and change to applicable
multipart reeving.
Relief valve setting too low. Check and adjust if required.
Motor worn excessively. Replace motor.
Counterbalance valve defective or
leaking.
Clean and replace as necessary.
Anti-two-block system defective. Repair anti-two-block system.
Brake worn out. Repair or replace brake.
Hoist gearbox heats
Gearbox grease low. Check and fill as required.
Duty cycle too high. Reduce cycle time or speed of hoist.
Boom chatters during extension/
retraction or doesn't proportion
properly
Boom sections need lubrication. Grease boom.
Wear pads not shimmed correctly.
Re-shim as described in boom assembly
section.
Worn wear pads. Replace pads.
Extension cables out of adjustment. Readjust cables and tension properly.
Extend or retract cables broken.
Disassemble and inspect and replace
cables.
Boom will not extend
Proportioning cables not attached. Reconnect, replace and/or adjust cables.
Anti-two-block system shut down. Lower hook, and extend load.
Defective anti-two-block system
Check anti-two-block system; repair if
defective.
System is in a state of constant cut-
out
Loose or incorrect wiring.
Carefully check the integrity of all circuits
external to the electronics box, from the jib
tip to the console. Compare to electrical
schematic.
Loose or incorrect wiring.
Carefully check the integrity of all circuits
external to the electronics box, from the jib
tip to the console. Compare to electrical
schematic.
Blown fuse.
Check fuse at crane console. Replace if
necessary. Remove electronics box from jib,
remove electronics from housing, and check
2A fuse on board. Replace if necessary.
ATB switch open. Ensure that ATB switch is closed.
No table selected.
Follow procedure in system installation
section to select the correct table for the
application.
Condition Possible Cause Possible Solution
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