2.4 Hydraulic clutch
Fwd clutch see Fig 2.4, reverse clutch see Fig.2.5.
There is a hydraulic clutch fixed on transmission, the drive gear on the side of
clutch is engaged with the corresponding driven gear, the drive gear on the side of
reverse clutch is engaged with the opposite gear.
The clutch is consists of 6 clutch disks and 7 steel plates. They are installed
alternately and assembled with piston.
The piston is provided with sliding type oil seal on its inner and outer
circumferences to insure oil sealing during operation. When out the action, the
dish-shaped return spring comes away the hydraulic clutch, the surface of clutch is
lubricated by the oil from oil condenser, to prevent conglutination and abrasion on clutch
surface.
When pressure oil acts to piston, the clutch and steel plate which fitted together are
pressed, so the clutch transfer the power to drive gear from torque converter.
The transfer flow of power from torque to transmission is as follows:
Turbine wheel-input shaft-clutch drum-steel plate-clutch disk-forward or reverse
gear-output shaft.
2.5 Control valve and inching valve
The control valve see Fig.2.6.
The control valve is installed on the top of transmission housing, reverse valve and
inching valve are installed in it.
Hydraulic clutch relief valve adjusts the oil pressure of clutch in transmission, the
torque converter relief valve adjusts the pressure of oil feed into torque converter.
The inching valve pole is connected with inching pedal, when press inching pedal,
the inching pedal press in , the oil pressure of clutch depress for a while, the clutch
loosen.
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