D9T Track-Type Tractor Hydraulic System – Location of Power Train Components

Illustration 1 g02430216

(1) Engine

(2) Power Train Oil Cooler

(3) Torque Converter

(4) Torque Converter Inlet Relief Valve

(5) Lubrication Distribution Manifold

(6) Power Train ECM

(7) Service Brakes

(8) Final Drives

(9) Torque Converter Charge Filter

(10) Transmission

(11) Transmission Hydraulic Control

(12) Transfer and Bevel Gears

(13) Transmission Charge Filter

(14) Power Train Accumulator

(15) Steering Differential

(16) Brake Control Valve

(17) Power Train Oil Pump

(18) Power Train Oil Filler

(19) Torque Converter Outlet Relief Valve

(20) Power Train Oil Dipstick


Operator Controls

Illustration 2 g02732114

(21) Parking Brake Switch

(22) Steering Control Lever

(23) Speed Control Thumbroller

(24) FNR Switch

Steering control lever (22) is located in the cab on the left console. The operator uses the steering control lever to steer the machine. The lever is pushed away from the operator in order to steer left. The lever is pulled toward the operator in order to steer right. The FNR switch (24) is moved to select FORWARD, REVERSE, or NEUTRAL.

Speed Control Thumbroller (23) is used to control the speed of the machine. Moving the thumbroller to the right increases the speed, and moving the thumbroller to the left decreases the speed of the machine.

Parking brake switch (21) de-energizes the parking brake solenoid when the switch is pulled up. This de-energizes the proportional solenoids and the brakes are then engaged in order to prevent the machine from moving. This switch is located to the left of steering control lever (22) . When the parking brake is engaged, the parking brake indicator on the dashboard will light.

Illustration 3 g02437796

(25) Service Brake Pedal

(26) Decelerator Pedal

Service brake pedal (25) controls the braking of the machine. Partially depressing the pedal will result in a light operation of the brakes. When the pedal is depressed completely, full braking action will be applied. The service brake pedal is the pedal on the left near the floor of the operator station.

Decelerator pedal (26) allows the operator to decrease the engine speed during machine operation. The decelerator pedal is the pedal on the right near the floor of the operator station.

Illustration 4 g02437798

(27) Low/High Idle Switch

Low/high idle switch (27) is located on the right console of the operator station. The low/high idle switch allows the operator to select either high idle or low idle engine speed.

Power Train Oil Filler

Illustration 5 g02437799

Power train oil filler (28) is located in the front compartment on the left fender. Power train oil is added to the system through the power train oil filler.

Power Train Oil Dipstick

Illustration 6 g02430725

(20) Power Train Oil Dipstick

Power train oil dipstick (20) is located under a hinged cover at the rear of the opening for the left engine compartment. The power train oil dipstick is used to check the level of power train oil in the system.

Power Train Oil Pump

Illustration 7 g02511896

(17) Power Train Oil Pump

Power train oil pump (17) is mounted to the front of the bevel gear case and inside the left frame. The power train oil pump is driven by a shaft from the hydraulic steering pump. The pump is a four-section gear pump which provides oil for the following functions: braking, transmission control, torque converter operation and lubrication.

Torque Converter

Illustration 8 g02431056

(3) Torque Converter

(19) Torque Converter Outlet Relief Valve

The housing for torque converter (3) is located behind the engine between the flywheel housing and the main drive shaft. The torque converter is a hydraulic connection that transfers engine power through the main drive shaft to the transmission. There is no direct mechanical connection between the engine and the main drive shaft. During operation, the torque converter multiplies torque as the load on the machine increases.

Torque converter outlet relief valve (19) is mounted to the upper left rear of the torque converter housing. The torque converter outlet relief valve maintains a minimum pressure in the torque converter.

Illustration 9 g02512496

(4) Torque Converter Inlet Relief Valve

(5) Lubrication Distribution Manifold

Torque converter inlet relief valve (4) is located on lubrication distribution manifold (5) . Torque converter inlet relief valve (4) controls the maximum oil pressure to the torque converter. Torque converter inlet relief valve (4) prevents damage to torque converter components when the engine is started and the oil is cold.

Power Train Oil Cooler

Illustration 10 g02431258

(2) Power Train Oil Cooler

Power train oil cooler (2) is mounted on the frame rail on the right side. Power train oil that exits the torque converter is cooled by engine coolant that circulates through tubes inside the cooler. Then, the oil flows to the lubrication distribution manifold. The manifold sends the oil to the brakes, the transmission, and the bevel gears for lubrication purposes.

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