PLATE 3969361 - Caterpillar

When the parking brakes are released manually, the machine has no brakes. To avoid possible personal injury, the tracks must be blocked securely before the parking brakes are manually released.
Illustration 1 g00294856
The propel pumps have two ports that can be used to manually bypass the propel pumps in order to tow the machine at slow speed.
Loosen each lock ring (1). Turn each valve (2) for three turns in a counterclockwise direction. There are two valves on each of the pumps.
Illustration 2 g00294857
Turn the knobs (4) in a clockwise direction in order to allow the oil to flow into the parking brakes. Turn the knobs until the knobs are finger tight.
Use the hand pump (3) that is located on the parking brake valve by the hydraulic tank. Pump the hand pump until the gauge (5) shows 2068 kPa (300 psi) in order to release the parking brakes.