PIN AS 2663943 - Caterpillar

Illustration 1 g03582636
(1) Transmission ECM
(2) Transmission
(3) Operator controls
(4) Solenoid valve
(5) Drive shaft
(6) Differential
(7) Final drives
(8) Tandems
(9) Wheels
(10) Drive pumps
(11) Control valve
(12) Drive motors
(13) Final drives
(14) Wheels The transmission electronic control module (ECM) (1) is located on the rear of the transmission (2). The ECM receives signals from the operator controls (3) as well as speed sensors and pressure sensors on the transmission. The operator may manually shift the transmission or allow the transmission to shift automatically.The transmission ECM regulates the shifting of gears. The ECM shifts gears by modulating the appropriate solenoid valve (4) to engage the corresponding clutch inside the transmission. When the transmission is in manual mode, the ECM will not upshift or downshift automatically unless there is an engine overspeed or underspeed condition.When the ECM performs an upshift or downshift, the ECM moves shift solenoids in the clutch control valves. The valves regulate oil flow directly down the clutches inside the transmission.The transmission has eight speeds forward and six speeds reverse. Transmission (2) is controlled by an electrical system and a hydraulic system. The selection of reverse, neutral, and forward is done manually. The transmission is an eight speed semiautomatic transmission.The flow of power is from the engine to transmission (2). Power then goes from transmission (2) through drive shaft (5) to differential (6). Finally, the power goes through final drives (7), tandems (8) to wheels (9).If equipped with the All Wheel Drive (AWD) system, power flows as follows. The drive pumps (10) push oil to the control valve (11) at the front of the machine. The control valve diverts oil to the drive motors (12) which drive the final drives (13) and wheels (14).