PLATE-BLOCK 4N4501 - Caterpillar

Illustration 1 g03662915
Output Transfer Gears
(1) Case
(2) Drive gear
(3) Shims
(4) Driven gear
(5) Shaft
(6) Yoke assembly (for front axle
(7) Yoke assembly (for rear axle) The output transfer gears are at the output side of the transmission. The transmission output shaft is connected to drive gear (2) by splines.Drive gear (2) is engaged with driven gear (4). Driven gear (4) is connected to shaft (5) by splines. Yoke assemblies (6) and (7) are connected to shaft (5) by splines. Yoke assembly (7) is connected to the short drive shaft that is connected to the rear differential. Yoke assembly (6) is connected to the drive shaft. The drive shaft is connected to the pillow block bearing and to the front differential.The flow of power in the output transfer gears goes from the transmission output shaft to drive gear (2). The power then flows from drive gear (2) to driven gear (4). The power then flows from the driven gear to shaft (5).At shaft (5), the flow of power divides. Some of the power goes from yoke assembly (7) through a drive shaft to the rear differential. Some of the power goes from yoke assembly (6) through a drive shaft and through the bearing cage to the front differential.Shims (3) are used to adjust the end play of gear (2).Magnetic Screen
Illustration 2 g03676332
Magnetic Screen Assembly
The magnetic screen assembly is located on the bottom right side of the rear of the transfer gear case. Oil from the bottom of the transfer gear case flows through an inlet passage. As the oil flows through the screen, foreign particles that are in the oil are stopped by the screen. The screen keeps the foreign particles from going into the transmission hydraulic system.As the oil flows through the screen, the oil flows over the magnets. The magnets are installed on the tube assembly so that the magnetic are close to each other. Small metal particles that may go through the screen are pulled to the magnets. The magnets retain metal particles in order to prevent metal in the transmission hydraulic system. Oil then flows to the transmission pump.