ELBOW 0679954 - Caterpillar

Illustration 1 g03557828
(1) Pump (two-section) (2) Transmission Filter (3) Modulating Valve (Torque Converter) (Lock Up) (4) Modulating Valve (Reverse) (Clutch 1) (5) Modulating Valve (Forward) (Clutch 2) (6) Modulating Valve (Fourth Speed) (Clutch 3) (7) Modulating Valve (Third Speed) (Clutch 4) (8) Modulating Valve (Second Speed) (Clutch 5) (9) Modulating Valve (First Speed) (Clutch 6) (10) Main Relief Solenoid Valve (11) Torque Converter Inlet Relief (12) Torque Converter Outlet Valve (13) Transmission Cooler (14) Sump (15) Suction Screen (16) Torque Converter (inlet) (17) Transmission LubricationThe transmission hydraulic system consists of the following components: suction screen (15) and magnet , transmission oil pump (1) , transmission oil filter (2) , transmission hydraulic control relief valve (10) , clutch solenoid modulating valves , torque converter (16) , torque converter inlet relief valve (11) and oil cooler (13) .The bottom of the output transfer gear case contains the oil sump from which the transmission oil pump pulls oil from. Transmission oil pump is a two-section positive displacement gear pump. The transmission oil pump has one inlet and two outlet ports. The two outlet ports are the charging outlet and the lube outlet. As the pump rotates, oil from the charge outlet oil flows to the transmission oil filter. Oil from the transmission oil filter then flows to the clutch solenoid modulating valves. Oil from the lube outlet of the oil pump flows to the torque converter, torque converter inlet relief valve (11) , and relief solenoid valve (10) .Clutch solenoid modulating valves are mounted on the top of the transmission. There is one clutch solenoid modulating valve for each of the six transmission clutches. In order to move the machine, a direction clutch solenoid and a speed clutch solenoid must be energized. Clutch solenoid modulating valves are used to directly modulate the oil pressure that is sent to each individual clutch. The clutch oil leakage and the return oil flows to the bottom of the transmission to the sump. All oil from non-energized clutch solenoid modulating valves flows to the bottom of the transmission to the sump. The oil sump is the bottom of the output transfer gear case.Transmission hydraulic control relief valve controls the pressure of the oil that is supplied to clutch solenoid modulating valves. Oil flows into transmission hydraulic control relief valve (10) at a maximum pressure of 2800 140 kPa (406 20 psi) at high idle and with transmission in neutral. The oil pressure overcomes the spring force of transmission hydraulic control relief valve. The torque converter inlet oil flows to torque converter (16) at a pressure of 760 150 kPa (110 22 psi) at high idle and with transmission in neutral.The oil from torque converter flows to relief valve. Relief valve maintains the oil pressure that is inside