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| Illustration 1 | g00679222 |
Hydraulic System Schematic (1) Transmission Oil Filter (2) Transmission hydraulic control relief valve (3) Torque converter inlet relief valve (4) Torque converter priority valve (5) Torque converter outlet relief valve (6) Torque converter (7) Modulating valve for the lockup clutch (8) Power train oil pump (9) Modulating valve for the impeller clutch (10) Power train oil cooler (11) Modulating valve for number 1 clutch (12) Modulating valve for number 4 clutch (13) Modulating valve for number 2 clutch (14) Modulating valve for number 5 clutch (15) Modulating valve for number 3 clutch (16) Modulating valve for number 6 clutch (17) Lubrication of the transmission planetary (18) Suction screen and magnet (19) Oil sump (20) Lubrication of the Input Transfer Gears (A) Torque converter inlet pressure tap (B) Pressure tap for pump pressure (C) Pressure tap for the modulating valve (lockup clutch) (D) Torque converter outlet pressure tap (E) Pressure tap for the modulating valve (impeller clutch) | |
The transmission hydraulic system consists of the following components: suction screen and magnet (18), transmission oil pump (8), transmission oil filter (1), torque converter priority valve (4), transmission relief valve (2), torque converter inlet relief valve (3), relief valve for the torque converter outlet (5), torque converter (6), modulating valve for the lockup clutch (7), modulating valve for the impeller clutch (9), modulating valves for the transmission clutches (11-16), transmission oil cooler (10), lubrication of the transmission planetary (17) and oil sump (19).
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| Illustration 2 | g00567811 |
Bottom View of the Torque Converter and Transmission Hydraulic Pump (20) Pump output hose. (21) Hose from the transmission hydraulic control relief valve to torque converter. (22) Hose from the sump to the transmission oil pump. (8) Transmission oil pump. | |
The bottom of the output transfer gear case contains oil sump (19). Transmission oil pump (8) is a one-section gear type pump. Transmission oil pump (8) supplies oil to the transmission hydraulic system. Transmission oil pump (8) pulls oil from oil sump (19). The oil flows through the suction screen and magnet (18). Oil is supplied to the pump inlet through hose (22). Pressurized oil exits the pump outlet and flows to transmission oil filter (1). Pressurized oil flows from transmission oil filter (1) through an external hose to the torque converter priority valve (4). The oil then flows through torque converter priority valve (4). The oil flows to modulating valves for the impeller clutch (9) and lockup clutch (7). The oil also exits torque converter priority valve (4) at another port which supplies oil to modulating valves for the transmission clutches (11-16).
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| Illustration 3 | g00567938 |
Top View of the Transmission Planetary (11) Modulating valve for the Number 1 clutch. (12) Modulating valve for the Number 4 clutch. (13) Modulating valve for the Number 2 clutch. (14) Modulating valve for the Number 5 clutch. (15) Modulating valve for the Number 3 clutch. (16) Modulating valve for the Number 6 clutch. (22) Outline of the transmission planetary. (2) Transmission hydraulic control relief valve. (23) Relief valve inlet. (24) Relief valve outlet. | |
Modulating valves for the transmission clutches (11-16) are mounted on the top of the transmission. The transmission is located under the cab. Each transmission clutch has an individual modulating valve. Two modulating valves for the transmission must be energized before the transmission will move the machine. In order to move the machine, a direction clutch solenoid and a speed clutch solenoid must be energized. The modulating valves for the transmission clutches (11-16) are used to directly modulate the oil pressure that is sent to each individual clutch. The clutch leakage oil and the return oil flows to the bottom of the transmission. Modulating valves for the transmission clutches (11-16) that are not energized route the oil to the bottom of the transmission. The oil then flows to oil sump (19) in the bottom of the output transfer gear case.
Oil that flows to modulating valves for the transmission clutches (11-16) is controlled by relief valve (2). Oil flows into relief valve (2) at a minimum pressure of 2620 ± 35 kPa (380 ± 5 psi). Oil flows through the valve and then oil flows to torque converter (6) at 690 ± 105 kPa (100 ± 15 psi). The oil flow for the torque converter inlet is limited to 1060 ± 100 kPa (154 ± 15 psi) by the torque converter inlet relief valve (3) .
The oil from torque converter (6) flows to relief valve (5). Relief valve (5) maintains the oil pressure that is inside torque converter (6) at a minimum of 414 ± 34 kPa (60 ± 5 psi). The oil flows from relief valve (5) to transmission oil cooler (10).
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| Illustration 4 | g00580192 |
Location of the Transmission Oil Cooler | |
Transmission oil cooler (10) is located on the left side of the machine. Transmission oil cooler (10) is attached to the side of the engine. After the oil has been cooled, the oil flows to the transmission. The oil provides lubrication to the transmission and cooling to the transmission. The oil flows through internal passages in the transmission to the bearings, the gears and the clutches. The oil then flows to the bottom of the transmission. The oil then flows to oil sump (19) in the bottom of the output transfer gear case.