Manitowoc National Crane 500E2 User Manual

500E2 OPERATOR MANUAL MAINTENANCE CHECKLIST
6
National Crane Published 07-26-2019 Control # 111-06 6-9
Swing moves erratic or sloppily
(Standard system)
Loose turntable bearing. Torque bearing mounting bolts.
Loose swing gearbox mounting bolts. Tighten bolts.
Worn gears or bearing.
Replace worn parts or adjust gearbox
spacing.
Operator control of lever too erratic. Operate controls smoothly.
Motor counterbalance valves dirty or not
set properly.
Clean or replace counterbalance valves not
set at 600 psi.
Brake not holding properly.
Replace worn brake parts or shim brake to
proper torque.
Replace worn brake parts or shim brake to
proper torque
Brake releasing at wrong time or
erratically.
Bleed air from brake with bleed screw on
side of brake.
Swing speed adjustment set too low.
Adjust or clean brake for proper release.
Adjust valve on turn motor.
Swing will not turn (Standard
System)
Turn circuit relief valves sticking. Clean and check circuit pressure.
Turntable bearing drag. Lubricate thoroughly as rotating boom.
Brake not releasing properly.
Check for 200 + PSI brake pilot pressure.
Clean pilot line or adjust motor
counterbalance valves.
Swing speed adjustment set too low.
Adjust or clean brake for proper release.
Adjust valve on turn motor.
Excessive pump noise during
operation
Excessive pump speed.
Adjust foot throttle or check for too high PTO
ratio.
Low oil temperature. Allow unit to warm up.
Low hydraulic oil supply. Check and fill.
Suction line kinked, collapsed or blocked. Clear blockage.
Hydraulic oil too thick.
Warm oil or use oil more applicable to
environment.
Relief valve chattering. Dirt in relief valve or damaged relief.
Hydraulic tubing vibration. Check for loose tubing.
Tank breather plugged. Clean breather.
Cylinders drift
Not getting oil to cylinders. Clean and replace as required.
Worn or damaged piston seals. Replace as required.
Air in hydraulic oil. Cycle operate crane cylinder to remove air.
Loose holding valve. Tighten valve.
Dirt in holding or check valve. Clean valve.
Condition Possible Cause Possible Solution

Manitowoc National Crane 500E2 Specifications

General

Brand	Manitowoc
Model	National Crane 500E2
Category	Construction Equipment
Language	English