ENGINE AR-COMPLETE 3856991 - Caterpillar

Illustration 1 g01904433
View of transmission lubrication valve (1)
( 2) Temperature sensor
(3) Pressure tap
(4) Pressure sensor Transmission lubrication valve (1) is located on the left side of the transmission.
Illustration 2 g02022475
View of transmission lubrication valve (1)
( 2) Temperature sensor for transmission lubrication
(5) Port to front module for the transmission
(6) Transmission lubrication relief valve
(7) Lube relief valve to drain port
(8) Orifice plug
(9) Lubrication pressure tap for clutch six and seven
(10) Port to clutch four and five, port to gear trains four, five, and six
(11) Supply port for the lubrication from pump Oil from the transmission lubrication pump section of the gear pump flows to transmission lubrication valve (1) through supply port (11). Some of the oil flows to the front transmission planetary group through the outlet hose, and the remaining lube oil enters the rear transmission planetary group.
Illustration 3 g01905293
Transmission lubrication relief valve
(12) Spring
(13) Inlet port
(14) Outlet ports Transmission lubrication relief valve (6) is located inside transmission lubrication valve (1). Oil flows into transmission lubrication relief valve (6) through inlet port (13) and presses against spring (12). Spring (12) controls the maximum pressure in the lubrication circuit. When enough pressure exists in the lubrication circuit to overcome spring (12), the oil is diverted through outlet ports (14) and drain port (7) to the transmission sump.Pressure sensor (4) for transmission lubrication oil and temperature sensor (2) for transmission lubrication oil are located on transmission lubrication valve (1). These sensors provide input signals to the Transmission ECM. Transmission lubrication pressure can be measured at pressure tap (3).Normally, the transmission lubrication pressure that is measured will be less than the relief valve setting. Transmission lubrication pressure is equal to the back pressure that is caused by the transmission components that are being lubricated.