Dover TWG TULSA WINCH 1200W Manuel d'entretien - Page 14
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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 0.068 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 winches rating. Verify weight and reduce the
load or re-rig it to increase mechanical advantage.
Hoist unable to lower load
Possible Solutions:
1. The hoses or tubes have been installed incorrectly. Check hose routing and correct any
(see page 4 for hydraulic schematic).
errors
2. The counterbalance valve cartridge may have a plugged metering hole
location of metering hole)
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.
TROUBLESHOOTING
. Remove the cartridge and clean it.
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(see page 10 for