HOIST 800D
11-14
Published 5-27-2018 Control # 039-06
TROUBLESHOOTING
Hoist won't hold load
Possible Solutions:
1. There is excessive back pressure in the hydraulic system. Check the system for line restrictions and reduce the back
pressure.
2. The brake discs are worn. Replace the brake discs. Friction discs should measure no less than 0.055 in thick and the
stator plates should measure at least 0.068 in thick.
3. The brake clutch is slipping due to wear of either driver and/or clutch. Inspect the driver components for wear and replace
if necessary.
Hoist unable to lift load
Possible Solutions:
1. The relief valve setting may be too low to allow proper lifting. Increase the relief pressure setting.
2. The load being lifted may be more than the hoists rating. Verify weight and reduce the load or re-rig it to increase
mechanical advantage.
Hoist unable to lower load
Possible Solutions:
1. The counterbalance valve cartridge may have a plugged metering hole (see Figure 11-7 for location of metering hole).
Remove the cartridge and clean it.
Oil leaks from motor-side vent
Possible Solutions:
1. The motor shaft seal may have failed. Replace the seal and reduce the back pressure if that was a cause of the seal
failure.
2. The brake pistons o-ring seals may have failed. Service the brake section and replace any worn parts found.
Fo
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