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| Illustration 1 | g00931740 |
This module discusses the features and operation of the power train hydraulic system. In addition, the major power train components are discussed.
The power train is a hydromechanical system. The hydromechanical system refers to the hydrostatic transmission that is coupled to the transmission gearbox and drive line. The power train is controlled and monitored by the IQAN.
The hydrostatic transmission is made up of the power train pump and the power train motor. The transmission gearbox contains the intermediate gears that transfer power to either first gear or second gear. The drive line is made up of the drive shafts, the differentials, the bogies, and the final drives.
The hydrostatic transmission controls the direction of travel of the machine. The high/low gear valve that is mounted on the combination valve controls the gear selection.
The power train allows the operator to control the speed of the machine and the direction of the machine. The power train system also allows the operator to control the differential lock, the access ladder, the parking brake, and the service brakes.
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| Illustration 2 | g00931958 |
Power from diesel engine (14) is sent from the flywheel to a pump drive. The pump drive is splined to implement pump (23). Implement pump (23) is splined to power train pump (22) .
The pump drive causes implement pump (23) and power train pump (22) to rotate. Power train pump (22) converts mechanical power from the flywheel to hydraulic power.
Power train pump (22) is connected to power train motor (20). The pressure side and the return side of both power train pump (22) and power train motor (20) are connected. This makes a closed loop circuit.
The connection between power train pump (22) and power train motor (20) makes up the hydrostatic drive of the power train.
Power train motor (20) is connected to transmission gearbox (18) by splines. Power train motor (20) converts hydraulic power into mechanical power.
The mechanical power from power train motor (20) flows through the speed solenoid valves of transmission gearbox (18) to the output transfer gears.
The transfer gears send power to the front differential and the rear differential via drive shafts (16). The bevel gear and pinion of each differential sends the power to each bogie (15) .
Each bogie (15) is connected to two final drives (17) through a series of gears. The gears in the bogies transfer power to both final drives (17).
The final drives (17) are bolted to the wheels. The final drive sends power to the wheel.
The hydraulic tank has two compartments. One compartment of the hydraulic tank is used for the power train. The other compartment is used for the implement hydraulic system.
The hydraulic oil tank (power train) (10) supplies oil to the following components in the power train.
- Charge pump (21)
- Power train pump (22)
- Power train motor (20)
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| Illustration 3 | g00932194 |
Combination Valve | |
The hydraulic oil tank (implement system) supplies oil to the following components in the power train.
- Four/eight wheel drive valve (27)
- High/low gear valve (28)
- Parking brake valve (29)
- Gate control valve (30)
- Ladder control valve (31)
- Differential lock valve (32)
- Brake accumulator charging valve (34)
Transmission gearbox (18) contains an oil reservoir. The gearbox uses a sump lubrication system. The oil will splash up from the gearbox. This lubricates the internal components.
The axles contain oil in the following locations.
- Differential (8)
- Brakes (5)
- Bogies (15)
- Final Drives (17)