Under Hydraulic Oil Tank.
(9) Thermal bypass valve.
Thermal bypass valve (9) is located under the hydraulic oil tank
behind the operator platform.
The valve directs return oil flow from the drive motors to
hydraulic oil cooler (13) and/or to hydraulic oil tank (10). The
cracking temperature is 56°C (160°F).
Rear Of Engine.
(13) Hydraulic oil cooler.
Hydraulic oil cooler (13) is located at the rear of the engine.
The cooler is air cooled by the engine fan. The hot oil is
cooled and then exits the outlet port (on the left side when
facing the front of the machine) to the hydraulic oil tank.
Rear of Operator Platform (right side).
(8) Parking brake and speed shift valves.
Parking brake and speed shift valves (8) are located under the
The parking brake valve is a solenoid operated, two position
valve that controls the operation of the brake in the drum drive
The speed shift control valve is a solenoid operated, two
position valve that controls the operation of the speed shi
mechanism in the drum drive and the axle motors.
Under Operator Platform.
(6) Brake interlock valve.
Brake interlock valve (6) is located under the operators
platform. This valve connects the two ends of the servo
together to prevent the pump from developing hydraulic flow
whenever the propel lever is moved off of neutral and the
parking brake applied. When the parking brake is released the
coil for valve (6) is energized. This blocks oil connecting the
servos allowing the servo to develop a differential pressure and
allow the pump to develop hydraulic oil flow.