D7E Track-Type Tractor Caterpillar

Probable Causes

• Failed brake components

Recommended Actions

The brakes are engaged with spring force. Hydraulic pressure is required to disengage the brakes. If hydraulic pressure is lost, the brakes fully engage due to the action of the spring force.

If the brakes are applied and the machine does not slow down or if the machine does not stop, follow this procedure.

Brake Components Have Failed

1. Check the brakes.

2. Disassemble the brakes and check the following components of the brakes for failure:

   • Brake housing

   • Reaction plate

   • Brake pistons

   • Belleville springs

   • Stationary ring gear

   • Seals

   • Splines

   • Friction discs

   • Brake plates

   • Shuttle valve

3. Replace any damaged components, if necessary.

4. Calibrate the brakes.

   Reference: Refer to Specifications, Systems Operation, and, Testing and Adjusting, UENR4065, "Calibration" .