Dover TWG TULSA WINCH 707W Servis Kılavuzu - Sayfa 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 0.064 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

location of metering hole)

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.

TROUBLESHOOTING

. Remove the cartridge and clean it.

(see page 10 for