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| Illustration 1 | g00908031 |
Transmission Hydraulic Control in the NEUTRAL Position and with the Engine Stopped. (1) Transmission hydraulic control relief valve (2) Torque converter (3) Torque converter outlet relief valve (if equipped) (4) Transmission oil filter (5) Modulating valve for the Number 1 clutch (6) Modulating valve for the Number 4 clutch (7) Modulating valve for the Number 2 clutch (8) Modulating valve for the Number 5 clutch (9) Modulating valve for the Number 3 clutch (10) Modulating valve for the Number 6 clutch (11) Transmission oil pump (12) Torque converter inlet relief valve (13) Suction screen and magnet (14) Oil sump (15) Transmission lubrication (16) Oil cooler (A) Pump pressure tap at the transmission hydraulic control relief valve (B) P3 Torque converter inlet pressure tap (C) Torque converter outlet pressure tap (D) Pump pressure tap at the oil filter (G) Number 1 clutch pressure tap (H) Number 4 clutch pressure tap (J) Number 2 clutch pressure tap (K) Number 5 clutch pressure tap (L) Number 3 clutch pressure tap (M) Number 6 clutch pressure tap (N) Transmission lubrication pressure tap | |
Starting the Engine with the Transmission in the NEUTRAL position
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| Illustration 2 | g00908156 |
Transmission Hydraulic Control in the NEUTRAL Position and with the Engine Running. (1) Transmission hydraulic control relief valve (2) Torque converter (3) Torque converter outlet relief valve (if equipped) (4) Transmission oil filter (5) Modulating valve for the Number 1 clutch (6) Modulating valve for the Number 4 clutch (7) Modulating valve for the Number 2 clutch (8) Modulating valve for the Number 5 clutch (9) Modulating valve for the Number 3 clutch (10) Modulating valve for the Number 6 clutch (11) Transmission oil pump (12) Torque converter inlet relief valve (13) Suction screen and magnet (14) Oil sump (15) Transmission lubrication (16) Oil cooler (A) Pump pressure tap at the transmission hydraulic control relief valve (B) P3 Torque converter inlet pressure tap (C) Torque converter outlet pressure tap (D) Pump pressure tap at the oil filter (G) Number 1 clutch pressure tap (H) Number 4 clutch pressure tap (J) Number 2 clutch pressure tap (K) Number 5 clutch pressure tap (L) Number 3 clutch pressure tap (M) Number 6 clutch pressure tap (N) Transmission lubrication pressure tap (AA) Pressure oil (BB) P3 Torque Converter inlet pressure (CC) Torque converter outlet pressure (DD) Lubrication pressure (EE) Return oil | |
When the engine is started, the transmission oil pump (11) pulls oil from oil sump (14). The oil flows through the suction screen and magnet (13). Transmission oil pump (11) sends pressurized oil through transmission oil filter (4). Pressurized transmission oil flows from the transmission oil filter to the oil inlet in the torque converter housing. The pressurized oil flows through internal passages in the torque converter housing in order to supply transmission hydraulic control relief valve (1) with oil. The pressurized oil also flows through internal passages in the transmission housing. The pressurized oil flows out of the internal passages in the transmission housing into modulating valves (5-10). Number 3 clutch solenoid (9) is energized because the transmission is in neutral. None of the remaining modulating valves (5), (6), (7), (8) and (10) provide oil to the transmission clutches. The pressurized oil leakage drains to oil sump (14) .
The transmission hydraulic control relief valve (1) sends P3 converter inlet oil to torque converter (2). Torque converter outlet oil flows to oil cooler (16). After the oil cools, the oil flows to the transmission for transmission lubrication (15). After the transmission is lubricated and cooled, the oil drains to the oil sump (14) .
Torque converter inlet relief valve (12) limits P3 torque converter inlet oil pressure to a maximum of 900 ± 70 kPa (130 ± 10 psi). Torque converter inlet relief valve (12) is located in the torque converter housing. Transmission hydraulic control relief valve (1) must be removed in order to attain access to torque converter inlet relief valve (12) .
Shifting the Transmission to the FIRST SPEED FORWARD position
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| Illustration 3 | g00908159 |
Transmission Hydraulic Control in the FIRST SPEED FORWARD Position and with the Engine Running. (1) Transmission hydraulic control relief valve (2) Torque converter (3) Torque converter outlet relief valve (if equipped) (4) Transmission oil filter (5) Modulating valve for the Number 1 clutch (6) Modulating valve for the Number 4 clutch (7) Modulating valve for the Number 2 clutch (8) Modulating valve for the Number 5 clutch (9) Modulating valve for the Number 3 clutch (10) Modulating valve for the Number 6 clutch (11) Transmission oil pump (12) Torque converter inlet relief valve (13) Suction screen and magnet (14) Oil sump (15) Transmission lubrication (16) Oil cooler (A) Pump pressure tap at the transmission hydraulic control relief valve (B) P3 Torque converter inlet pressure tap (C) Torque converter outlet pressure tap (D) Pump pressure tap at the oil filter (G) Number 1 clutch pressure tap (H) Number 4 clutch pressure tap (J) Number 2 clutch pressure tap (K) Number 5 clutch pressure tap (L) Number 3 clutch pressure tap (M) Number 6 clutch pressure tap (N) Transmission lubrication pressure tap (AA) Pressure oil (BB) P3 Torque Converter inlet pressure (CC) Torque converter outlet pressure (DD) Lubrication pressure (EE) Return oil | |
The power train electronic control module (ECM) modulates the electrical current that is sent to the selected modulating valves. Modulating the current to the modulating valve controls the transmission clutch pressure.
When the transmission direction and speed control lever (if equipped) is moved to the FIRST SPEED FORWARD position, both Number 2 clutch solenoid (7) and Number 6 clutch solenoid (10) are energized. When the transmission direction control switch (if equipped) and the transmission upshift switch are shifted to the FIRST SPEED FORWARD position, both Number 2 clutch solenoid (7) and Number 6 clutch solenoid (10) are energized.
Number 2 clutch solenoid (7) is electronically modulated when the Number 2 clutch is filled. Number 6 clutch solenoid (10) is electronically modulated when the Number 6 clutch is filled. When the electrical current is modulated to the full current, the Number 6 clutch and the Number 2 clutch are at full oil pressure.
Modulating valves (5), (6), (8), and (9) are not energized. The leakage oil drains to oil sump (14) .
ReferenceFor additional information on the operation of the transmission hydraulic control, refer to the Service Manual module for Systems Operation, "Transmission Hydraulic Control" for the machine that is being serviced.
ReferenceFor additional information on the operation of the modulating valves, refer to the Service Manual module for Systems Operation, "Modulating Valves (Transmission Clutch)" for the machine that is being serviced.
ReferenceFor additional information on the power train electronic control module (ECM), refer to the Service Manual module for Systems Operation, "Electronic Control Module (Power Train)" for the machine that is being serviced.
Transmission in the FOURTH SPEED REVERSE position
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| Illustration 4 | g00908160 |
Transmission Hydraulic Control in the FOURTH SPEED REVERSE Position and with the Engine Running. (1) Transmission hydraulic control relief valve (2) Torque converter (3) Torque converter outlet relief valve (if equipped) (4) Transmission oil filter (5) Modulating valve for the Number 1 clutch (6) Modulating valve for the Number 4 clutch (7) Modulating valve for the Number 2 clutch (8) Modulating valve for the Number 5 clutch (9) Modulating valve for the Number 3 clutch (10) Modulating valve for the Number 6 clutch (11) Transmission oil pump (12) Torque converter inlet relief valve (13) Suction screen and magnet (14) Oil sump (15) Transmission lubrication (16) Oil cooler (A) Pump pressure tap at the transmission hydraulic control relief valve (B) P3 Torque converter inlet pressure tap (C) Torque converter outlet pressure tap (D) Pump pressure tap at the oil filter (G) Number 1 clutch pressure tap (H) Number 4 clutch pressure tap (J) Number 2 clutch pressure tap (K) Number 5 clutch pressure tap (L) Number 3 clutch pressure tap (M) Number 6 clutch pressure tap (N) Transmission lubrication pressure tap (AA) Pressure oil (BB) P3 Torque Converter inlet pressure (CC) Torque converter outlet pressure (DD) Lubrication pressure (EE) Return oil | |
The power train electronic control module (ECM) modulates the electrical current that is sent to the selected modulating valves. Modulating the current to the modulating valve controls the transmission clutch pressure.
When the transmission direction and speed control lever (if equipped) is moved to the FOURTH SPEED REVERSE position, both Number 1 clutch solenoid (5) and Number 3 clutch solenoid (9) are energized. When the transmission direction control switch (if equipped) and the transmission upshift switch is shifted to the FOURTH SPEED REVERSE position, both Number 1 clutch solenoid (5) and Number 3 clutch solenoid (9) are energized.
Number 1 clutch solenoid (5) is electronically modulated when the Number 1 clutch is filled. Number 3 clutch solenoid (9) is electronically modulated when the Number 3 clutch is filled. When the electrical current is modulated to the full current, the Number 3 clutch and the Number 1 clutch are at full oil pressure.
Modulating valves (6), (7), (8), and (10) are not energized. The leakage oil drains to oil sump (14) .
ReferenceFor additional information on the operation of the transmission hydraulic control, refer to the Service Manual module for Systems Operation, "Transmission Hydraulic Control" for the machine that is being serviced.
ReferenceFor additional information on the operation of the modulating valves, refer to the Service Manual module for Systems Operation, "Modulating Valves (Transmission Clutch)" for the machine that is being serviced.
ReferenceFor additional information on the power train electronic control module (ECM), refer to the Service Manual module for Systems Operation, "Electronic Control Module (Power Train)" for the machine that is being serviced.