631G Wheel Tractor-Scraper Wheel Tractor Power Train Caterpillar

Transmission Oil Pump

Usage:

631G AWK

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Illustration 1	g00772685
Rear of Tractor (1) Transmission oil filter (2) Transfer gear case

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Illustration 2	g00772695
Rear of Tractor (3) Transmission charging pump section (4) Transmission scavenge pump section (5) Magnetic screen (6) Scavenge line screen

The power train has two oil pumps that are located in transfer gear case (2). Transmission scavenge pump section (4) is on the cover end. Transmission charging pump section (3) is on the gear end. The pumps are driven by the transmission input gear which is located in transfer gear case (2). The oil for the scavenge section flows from the transfer gear case housing through scavenge line screen (6). Transmission scavenge pump section (4) sends the oil to the differential and bevel gear case. The oil for transmission charging pump section (3) flows from the differential and bevel gear case. The oil flows through magnetic screen (5), transmission charging pump section (3) and transmission filter (1) to the selector control valve in the transmission. The oil is then directed to the pressure control valve. Part of the oil flows to the transmission clutches. Part of the oil flows to the torque converter inlet valve.

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