574B Forwarder Power Train Transmission Gearbox Caterpillar


Transmission Gearbox
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1.1. Power Flow
2.1. Gear Speed
3.1. All Wheel Drive Position
4.1. Lubrication



Illustration 1g00930211

The transmission gearbox contains two separate speeds. The transmission is shifted hydraulically by a gearshift valve. The gearshift valve is mounted on the machine separately from the transmission gearbox.

Power Flow




Illustration 2g00930213

Power Flow for Transmission Gearbox (First Speed)




Illustration 3g00930214

Power Flow for Transmission Gearbox (Second Speed)

The transmission is connected to the power train motor that is located at the front of the transmission. The power train motor transmits power to the transmission. The power train motor also controls the direction of the rotation of the transmission. The power flows from the output shaft of the power train motor. The power train motor is splined directly to input shaft (4) .

Reference: Systems Operation, "Piston Motor (Power Train)".

Input shaft (4) transfers power directly to the input shaft gear (3). Power then flows into gear case (5). Gear case (5) contains the intermediate gears that transfer power to either first gear (8) or second gear (9). The power will flow to either gear relative to the position of shifting sleeve (12) and shifting rod (11). Shifting rod (11) is actuated by a gearshift piston that is mounted to the side of the transmission gearbox. The gearshift piston is controlled by the high/low gear valve that is mounted on the combination valve.

Reference: Systems Operation, "Gearshift Valve".

Gear Speed




Illustration 4g00930216

Transmission speed is monitored with speed sensor (17). Speed sensor (17) is mounted in the transmission housing. Speed sensor (17) signals to the IQAN. The operating speed is based on the gear that is selected.




Illustration 5g00930215

The machine must be stopped completely in order to shift gears. A function in the IQAN software will ensure that the gearbox is shifted smoothly. If the IQAN does not receive any signal from gearshift switches (14) and (15), the IQAN will begin to send a low signal to the power train pump. This signal will slowly turn the power train pump in one direction. The load on the transmission gearbox will be reduced and neutralized. This operation will slowly turn the shaft of the power train motor in one direction, which will cause the gears to be shifted smoothly to the fully engaged position.




Illustration 6g00930360

Gearshift Housing

IQAN uses signals from the transmission in order to determine the gear position. The gear position is determined from position switch (15) and position switch (14). Position switches (14) and (15) act as two-position switches. The position switches are mounted in gearshift housing (16). Gearshift housing (16) also contains gearshift piston (20) .

All Wheel Drive Position




Illustration 7g00930358

The transmission gearbox is capable of shifting from eight wheel drive to four wheel drive.

Note: The four wheel drive is an option for roading purposes only. The four wheel drive should only be used with an unloaded machine. Make sure that you shift the transmission gearbox into eight wheel drive prior to entering working mode.

The rear output shaft may be disengaged, if necessary. The rear output shaft may be turned on or off while the machine is in motion. However, the rear output shaft cannot be engaged when the wheels and the tires slip on the ground. The rear output shaft is shifted hydraulically by the four/eight wheel drive valve that is mounted to the combination valve.

Lubrication

The transmission gearbox is lubricated separately. The transmission gearbox is filled with oil to a specified level. This oil is used to lubricate the internal components of the transmission gearbox only. The gearbox uses a sump lubrication system. The oil will splash up from the gearbox. This lubricates the internal components.

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