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| Illustration 1 | g00873827 |
Transmission Hydraulic Control in the NEUTRAL position and with the Engine Stopped. (1) Transmission hydraulic control relief valve (2) Torque converter inlet relief valve (3) Torque converter (4) Torque converter outlet relief valve (5) Transmission oil filter (6) Clutch solenoid modulating valve for the Number 1 clutch (7) Clutch solenoid modulating valve for the Number 4 clutch (8) Clutch solenoid modulating valve for the Number 2 clutch (9) Clutch solenoid modulating valve for the Number 5 clutch (10) Clutch solenoid modulating valve for the Number 3 clutch (11) Clutch solenoid modulating valve for the Number 6 clutch (12) Transmission oil pump (13) Suction screen and magnet (14) Oil sump (15) Transmission lubrication (16) Oil cooler (A) P3 Torque converter inlet pressure tap (B) Torque converter outlet pressure tap (C) Pump pressure tap at the oil filter (D) Pressure tap for the Number 1 clutch (E) Pressure tap for the Number 4 clutch (F) Pressure tap for the Number 2 clutch (G) Pressure tap for the Number 5 clutch (H) Sampling valve for the transmission oil (J) Pressure tap for the Number 3 clutch (K) Pressure tap for the Number 6 clutch (L) Transmission lubrication pressure tap | |
Starting the Engine with the Transmission in the NEUTRAL position
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| Illustration 2 | g00874685 |
The Transmission Hydraulic Control in the NEUTRAL position and the Engine is Running. (1) Transmission hydraulic control relief valve (2) Torque converter inlet relief valve (3) Torque converter (4) Torque converter outlet relief valve (5) Transmission oil filter (6) Clutch solenoid modulating valve for the Number 1 clutch (7) Clutch solenoid modulating valve for the Number 4 clutch (8) Clutch solenoid modulating valve for the Number 2 clutch (9) Clutch solenoid modulating valve for the Number 5 clutch (10) Clutch solenoid modulating valve for the Number 3 clutch (11) Clutch solenoid modulating valve for the Number 6 clutch (12) Transmission oil pump (13) Suction screen and magnet (14) Oil sump (15) Transmission lubrication (16) Oil cooler (A) P3 Torque converter inlet pressure tap (B) Torque converter outlet pressure tap (C) Pump pressure tap at the oil filter (D) Pressure tap for the Number 1 clutch (E) Pressure tap for the Number 4 clutch (F) Pressure tap for the Number 2 clutch (G) Pressure tap for the Number 5 clutch (H) Sampling valve for the transmission oil (J) Pressure tap for the Number 3 clutch (K) Pressure tap for the Number 6 clutch (L) Transmission lubrication pressure tap (L) Transmission lubrication pressure tap (AA) Return oil (BB) Pressure oil (CC) P3 Torque converter inlet pressure (DD) Torque converter outlet pressure (EE) Lubrication pressure | |
When the engine is started, the transmission oil pump (12) pulls oil from oil sump (14). The oil flows through the suction screen and magnet (13). Transmission oil pump (12) sends pressurized oil through transmission oil filter (5). Pressurized transmission oil flows from the transmission oil filter to the oil inlet in the transmission case. The pressurized oil flows through internal tubes in order to supply transmission hydraulic control relief valve (1) with oil. The pressurized oil also flows through internal passages in the transmission hydraulic control manifold. The pressurized oil flows out of the internal passages in the transmission hydraulic control manifold into clutch solenoid modulating valves (6-11). Number 3 clutch solenoid (10) is energized because the transmission is in neutral. None of the remaining clutch solenoid modulating valves (6), (7), (8), (9) and (11) 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 (3). 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 (2) limits P3 torque converter inlet oil pressure to a maximum of 1060 ± 100 kPa (154 ± 15 psi).
Shifting the Transmission to the FIRST SPEED FORWARD position
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| Illustration 3 | g00874710 |
The Transmission Hydraulic Control in the FIRST SPEED FORWARD position and the Engine is Running. (1) Transmission hydraulic control relief valve (2) Torque converter inlet relief valve (3) Torque converter (4) Torque converter outlet relief valve (5) Transmission oil filter (6) Clutch solenoid modulating valve for the Number 1 clutch (7) Clutch solenoid modulating valve for the Number 4 clutch (8) Clutch solenoid modulating valve for the Number 2 clutch (9) Clutch solenoid modulating valve for the Number 5 clutch (10) Clutch solenoid modulating valve for the Number 3 clutch (11) Clutch solenoid modulating valve for the Number 6 clutch (12) Transmission oil pump (13) Suction screen and magnet (14) Oil sump (15) Transmission lubrication (16) Oil cooler (A) P3 Torque converter inlet pressure tap (B) Torque converter outlet pressure tap (C) Pump pressure tap at the oil filter (D) Pressure tap for the Number 1 clutch (E) Pressure tap for the Number 4 clutch (F) Pressure tap for the Number 2 clutch (G) Pressure tap for the Number 5 clutch (H) Sampling valve for the transmission oil (J) Pressure tap for the Number 3 clutch (K) Pressure tap for the Number 6 clutch (L) Transmission lubrication pressure tap (L) Transmission lubrication pressure tap (AA) Return oil (BB) Pressure oil (CC) P3 Torque converter inlet pressure (DD) Torque converter outlet pressure (EE) Lubrication pressure | |
The power train electronic control module (ECM) modulates the electrical current that is sent to the selected clutch solenoid modulating valve. Modulating the current to the clutch solenoid modulating valve controls the transmission clutch pressure.
When the transmission direction control switch and the transmission upshift switch are shifted to the FIRST SPEED FORWARD position, both Number 2 clutch solenoid (8) and Number 6 clutch solenoid (11) are energized.
Number 2 clutch solenoid (8) is electronically modulated when the Number 2 clutch is filled. Number 6 clutch solenoid (11) 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.
Clutch solenoid modulating valves (6), (7), (9), and (10) are not energized. The leakage oil drains to oil sump (14) .
Reference: For 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.
Reference: Refer to the Service Manual module Systems Operation, "Modulating Valves (Transmission Clutch)" for additional information on the clutch solenoid modulating valve on the machine that is being serviced.
Reference: For 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 | g00874723 |
The Transmission Hydraulic Control in the FOURTH SPEED REVERSE position and the Engine is Running. (1) Transmission hydraulic control relief valve (2) Torque converter inlet relief valve (3) Torque converter (4) Torque converter outlet relief valve (5) Transmission oil filter (6) Clutch solenoid modulating valve for the Number 1 clutch (7) Clutch solenoid modulating valve for the Number 4 clutch (8) Clutch solenoid modulating valve for the Number 2 clutch (9) Clutch solenoid modulating valve for the Number 5 clutch (10) Clutch solenoid modulating valve for the Number 3 clutch (11) Clutch solenoid modulating valve for the Number 6 clutch (12) Transmission oil pump (13) Suction screen and magnet (14) Oil sump (15) Transmission lubrication (16) Oil cooler (A) P3 Torque converter inlet pressure tap (B) Torque converter outlet pressure tap (C) Pump pressure tap at the oil filter (D) Pressure tap for the Number 1 clutch (E) Pressure tap for the Number 4 clutch (F) Pressure tap for the Number 2 clutch (G) Pressure tap for the Number 5 clutch (H) Sampling valve for the transmission oil (J) Pressure tap for the Number 3 clutch (K) Pressure tap for the Number 6 clutch (L) Transmission lubrication pressure tap (L) Transmission lubrication pressure tap (AA) Return oil (BB) Pressure oil (CC) P3 Torque converter inlet pressure (DD) Torque converter outlet pressure (EE) Lubrication pressure | |
The power train electronic control module (ECM) modulates the electrical current that is sent to the selected clutch solenoid modulating valves. Modulating the current to the clutch solenoid modulating valve controls the transmission clutch pressure.
When the transmission direction control switch and the transmission upshift switch is shifted to the FOURTH SPEED REVERSE position, both Number 1 clutch solenoid (6) and Number 3 clutch solenoid (10) are energized.
Number 1 clutch solenoid (6) is electronically modulated when the Number 1 clutch is filled. Number 3 clutch solenoid (10) 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.
Clutch solenoid modulating valves (7), (8), (9), and (11) are not energized. The leakage oil drains to oil sump (14) .
Reference: For 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.
Reference: For additional information on the operation of the clutch solenoid modulating valves, refer to the Service Manual module for Systems Operation, "Modulating Valves (Transmission Clutch)" for the machine that is being serviced.
Reference: For 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.