Dover TWG 250PR Service & Repair Manual - Page 14

Browse online or download pdf Service & Repair Manual for Industrial Equipment Dover TWG 250PR. Dover TWG 250PR 19 pages.

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GEARBOX BRAKE WON'T HOLD

Possible Solutions:

1. The brake discs and or stator plates are worn. Friction discs should measure no less than

0.075 inches thick and the stator plates should measure at least 0.045 inches thick and

replace as necessary

2. Broken dowel pins in brake piston

3. Mechanical failure. Evaluate all parts that transmit torque to ensure structural integrity and

replace any parts that show signs of damage or excessive wear

4. Weak or damaged brake springs. Free length of springs should be 1.000"

GEARBOX UNABLE TO ROTATE

Possible Solutions:

1. Motor failure. Remove motor and rotate both directions verifying pressure rotating in both

directions is appropriate.

2. Gearing Failure. See page 13 for servicing the planetary gear sets

3. One of the counterbalance valve cartridges may have a plugged metering

hole

Remove the counterbalance cartridge valves and inspect/clean metering holes

Le to lower load

OIL LEAKS FROM VENT

Possible Solutions:

1. The brake piston O-rings may have failed. Service the brake section and replace any worn

or damaged parts and O-rings found

2. Hydraulic motor shaft seal failure. Return to an authorized dealer for service

3. Gearbox is overfilled with oil. Maintain proper oil amount

4. Brake oil seal failure. Inspect and replace oil seal

TROUBLESHOOTING

(Item 34).

Check and replace if necessary