GLASS 1156806 - Caterpillar

Illustration 1 g06040833
(1) Gear Pump (two-section)
(1A) Controls Flow (High Pressure)
(1B) Converter Charging Flow (Low Pressure)
(1C) Pump purge Orifice
(2) Oil Filter (Transmission)
(2A) Pump Pressure (Machine Test Location)
(3) Control Group (Transmission Hydraulics)
(3A) Valve Group (Control)
(3B) Solenoid for Clutch 1
(3C) Solenoid for Clutch 2
(3D) Total Clutch Leakage (Max)
(3E) Valve Group (Control)
(3F) Solenoid for Clutch 3
(3G) Solenoid for Clutch 4
(3H) Valve Group (Control)
(3J) Solenoid for Clutch 5
(3K) Solenoid for Clutch 6
(4) Valve Group (Control)
(4A) Electronic Main Relief Valve
(4B) Pump Pressure
(4C) Transmission Oil Temperature
(4D) Solenoid for Lock-up Clutch
(4E) Torque Converter Inlet Pressure
(5) Lube (Pump Dive)
(6) Torque Converter
(6A) Torque Converter (Leakage)
(6B) Torque Converter Outlet Pressure
(6C) Torque Converter Temperature
(6D) Valve - Relief (Torque Converter Inlet)
(7) Cooler Group (Transmission)
(8) Transmission
(8A) Lube Pressure
(8B) Transmission Lube
(8C) Screen Assembly Tube Assembly -MagneticThe bottom of the output transfer gear case contains the oil sump from which the transmission oil pump pulls oil. 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 not used by the clutch solenoids flows through the electronic main relief valve. The charge outlet oil flow converges with oil flow from the lube outlet of the oil pump. All the oil from the oil pump flows to the torque converter, torque converter inlet relief valve (6).Clutch solenoid modulating valves are mounted on the transmission. There is one clutch solenoid modulating valve for each of the six transmission clutches and torque converter lock-up clutch. 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.The electronic main relief valve controls the pressure of the oil that is supplied to clutch solenoid modulating valves. The electronic main relief valve is an electronically controlled proportional solenoid valve. The electronic main relief valve adjust the flow from the pressure side of the transmission to the transmission lube circuit. The flow allows the clutch pressure to increases or decrease utilizing a signal from the transmission ECM.The oil from the torque converter flows to the transmission oil cooler which is located under the engine, attached to the fuel tank. 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