Shop Manual

20-42
Gearbox Solenoid Valve
Function
 When operate the transmission
manipulator handle to conduct forward
and reverse each shift, the electric signal
is sent to the four solenoid valves
mounted on the gearbox control valve to
control the slid valve of each shift
according to the open and close solenoid
combination.
Operation
1. Solenoid Valve Switch Off
The oil from oil pump is blocked by the
solenoid valve, which make the shift slid
valve is moved to left side under the
action of spring force, consequently the
oil at the port E flows into the K3 clutch.
2. Solenoid Valve Switch On
When operate the transmission
manipulator handle, the solenoid valve
will block the drain port and switch on the
oil from oil pump to port A and B of shift
slid valve, the slid valve is moved to right
side due to the action of oil pressure
overcomes the spring force, consequently
the oil from oil pump is flowed to the K1
clutch.
Operation Chart of Solenoid Valve and
Clutch ● : Current
Action
Shifts
Solenoid Valve
M1 M2 M3 M4
Forward 1
st
Shift ● ● ●
Forward 2
nd
Shift ● ● ●
Forward 3
rd
Shift ● ●
Forward 4
th
Shift ● ●
Forward 5
th
Shift ●
Forward 6
th
Shift ●
Neutral
Reverse 1
st
Shift ● ● ● ●
Reverse 2
nd
Shift ● ● ●
Reverse 3
rd
Shift ● ●
From
Oil pump
K3 clutch
From
Oil pump
K1 clutch