Doosan DX60R Shop Manual page 534

Brake torque is not sufficient.
Condition
Brake torque is not
sufficient
Motor is much slip
Investigates the DRAIN quantity for motor.
Normal: app. 200 cc/min
Condition
Motor is much slip
Oil leak
1. Oil leak from the oil seal
Condition
Oil leak from the oil
seal
2. Oil leak from the blind and union
Condition
Oil leak from the blind
and union
Swing Motor
Page 20
Cause
1. Friction plates are worn.
2. Brake piston is becoming stick.
3. Brake releasing pressure is not
working.
4. Spline of friction
damaged.
Cause
1. Working defectiveness of relief
valve is the same item 1).
2. Seat defectiveness of plunger.
Cause
1. The lip is dirty or damaged.
2. The shaft may be damaged or
worn out.
3. The lib is damaged too high
pressure in the casing.
4. The shaft is rusty.
Cause
1. O-ring is not in.
2. O-ring is broken.
3. Seal face is defective.
4. The bolt is loose or not tightened.
1. Disassembly or inspection. When it is
worn better than standard, replace it.
2. Disassembly or inspection
3.
plates are 1) Check for the circuit.
2) Check for the brake valve
4. Disassembly or inspection.
1) Replace for damaged parts.
1. It is the same item 1).
2. Replace it.
1. Replace the oil seal.
2. Replace the driving shaft or defective
centering of the driving shaft.
3. It repairs the drain piping which is
closed up.
4. Disassemble, repair, and replace the
oil seal.
1. Insert O-ring.
2. Replace it.
3. Disassemble or repair.
4. Tighten adequately or replace it.
Remedy
Remedy
Remedy
Remedy
SP001630