777F Off-Highway Truck Power Train: Transfer Gears, Oil Filter (Transmission Charging) & Magnetic Screen (Transmission Oil Lines)

1.-Transfer Gears

Components of the transfer gears (1) Shims (2) Drive gear (3) Yoke (4) Driven gear (5) Case(6) Shims

The transfer gears are in the transfer gear case that is fastened to the front of the transmission case. The drive shaft connects the torque converter to yoke (3) .

Yoke (3) is connected to drive gear (2) by splines. The teeth on drive gear (2) are engaged with the teeth on driven gear (4). Driven gear (4) is connected by splines to the input shaft of the transmission.

Yoke (3) turns drive gear (2). Drive gear (2) turns driven gear (4). Driven gear (4) turns the input shaft of the transmission.

Shims (1) are used to make adjustments to the end play of drive gear (2). Shims (6) are used to make adjustments to the end play of driven gear (4) .

Oil for the lubrication of the transfer gears comes from the transmission lubrication circuit. The oil comes through a passage in the transmission case to a passage in transfer gear case (5). Some of this oil goes into a tube assembly. The tube assembly sprays oil on drive gear (2) and on driven gear (4). The gears throw the oil around inside transfer gear case (5). This provides lubrication for the bearings in the transfer gear case. The extra oil in the bottom of transfer gear case (5) goes through a drain passage into the transmission case.

2.-Oil Filter (Transmission Charging)

(1) Inlet (2) Outlet (3) Oil sampling valve (4) Bypass switch (5) Pressure test port(6) Charge filters for the transmission

Charge filters for the transmission (6) are located on the right side of the frame assembly behind the front wheel.

Oil from the transmission section of the hydraulic tank flows to the transmission gear pump. The transmission charging section of the pump sends oil to charging filter (1) .

Oil flows through inlet passage (1). The oil fills the space between the inside of the housing and the element. During normal operation, the oil flows through the element and out outlet passage (2) to the transmission hydraulic control. The element stops any debris that is in the oil.

If the element becomes full of debris, the restriction to the flow of oil cause a pressure increase inside the housing. The pressurized oil activates bypass switch (4) and an alarm is registered in the cab.

The oil then flows past the open bypass valve and to the transmission hydraulic control. When the oil does not flow through the element, the debris in the oil will cause damage to other components in the transmission system.

Use correct maintenance in order to make sure that the element does not become full of debris. If the element is full of debris, the flow of clean oil to the transmission system is stopped.

3.-Magnetic Screen (Transmission Oil Lines)

Transmission magnetic screen

Construction of the magnetic screen (1) O-ring seal (2) Cover (3) Wave washer (4) Housing (5) Outlet (6) Magnets (7) Screen (8) Tube assembly(9) Inlet

The magnetic screen is fastened to the scavenge section of the transmission pump. Oil from the bottom of the transmission case goes through inlet (9). As the oil flows through tube assembly (8), the oil flows through the openings that are between magnets (6). The magnets are installed on the tube assembly so that the same magnetic ends are next to each other.

As the oil flows over the magnets, metal particles are stopped by the magnets. The oil then flows through screen (7) to outlet (5). Other foreign particles are stopped as the oil flows through the screen. The particles are not allowed to go into the transmission system. The oil flows from outlet (5) to the transmission scavenge pump section. The oil is sent back to the transmission section of the hydraulic tank.

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777F Off-Highway Truck Power Train: Transfer Gears, Oil Filter (Transmission Charging) & Magnetic Screen (Transmission Oil Lines) 2013-01-04T15:49:00-08:00 Rating: 4.5 Diposkan Oleh: Unknown