WASHER-SPECIAL 2943032 - Caterpillar

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 torque 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 660 175 kPa (96 25 psi).Shifting the Transmission to the FIRST SPEED FORWARD position
Illustration 3 g01112737
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