Hydraulic system

5.11Travel drive up to serial no. AC 02793

The traveling drive has two speed ranges.

Function

Driving

The shuttle valve actuates the brake cylinder and releases the brake if high pressure is applied to one of the drive ports. The brake piston is slowly actuated at the same time. Brake piston control causes high pressure to be applied to the motor, which starts turning.

Stopping

The oil flows from both ports to the tank upon releasing the joystick. The brake piston slowly returns to home position by means of the throttle orifices. The slow drop of the brake piston prevents the hydraulic motor from coming to an abrupt standstill. With the brake piston in neutral position, the ports are no longer connected to the motor, which can no longer turn. The brake release pressure is reduced via both throttles shortly afterward.

2nd Speed Range Function

1st speed range

• 2nd speed range switch: turned off

The directional valve for the 2nd speed range remains in home position (position as shown in diagram), and the hydraulic motor's swash plate is in maximum capacity position. The motor turns at low speed.

2nd speed range

• 2nd speed range switch: turned on

The directional valve for the 2nd speed range is enabled, and the hydraulic motor's swash plate is in minimum capacity position. The motor turns at high speed.