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 inches thick and the stator plates should measure at least 0.064 inches 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 page 10 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. Have the seal replaced 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.
TORQUE SPECIFICATIONS CHART
14
Summary of Contents for TWG TULSA WINCH 506W
Page 4: ...HYDRAULIC SCHEMATIC 4 ...
