3-M16
L3130 · L3430 · L3830 · L4630 · L5030, WSM
TRANSMISSION
1. Oil is supplied from the power steering hydraulic pump (2) while running the engine.
2. The oil entering the regulating valve assembly (1) flows through the pressure reducing valve (5) to the GST circuit.
This oil pressure is maintained at a fixed level by the pressure reducing valve (5).
3. When the GST lever is operated, the desired shift solenoids (8), (9), (10), (11), (14) or (16) are excited according
to the output voltage from the GST lever sensor.
4. When the solenoid valve is operated, oil is supplied to corresponded shift pistons (12), (13), (15) or (17), and the
shift piston is moved. The shift arm that is moved by the shift piston moves shifter of synchromesh to shift the gear.
At this time, GST clutch (27) has been disengaging until gear shifting is completed.
The GST clutch (27) is engaging except where the condition is neutral, is gear shifting and is engine stopping.
5. Pressure in the pilot circuit rises because the shift check valves (18), (21) and (19) or (20) are shut by the
movements of shift pistons at the same time as completing gear shifting.
6. By means of pressure rising of the circuit, the clutch valve (24) is actuated. And, oil flows through the low-pass
valve (25) and the proportional reducing valve (26) to the GST clutch (27). This oil flows until becoming the
compound pressure which is both of setting pressure for closing of low-pass valve, and controlled indication
pressure of the proportional reducing valve.
(Reference)
• Setting pressure for closing of low-pass valve : 0.24 MPa (2.5 kgf/cm
2
, 34.1 psi)
7. Because pressure in the GST clutch (27) is gradually pressurized by function of proportional reducing valve (26),
clutch is able to engage without shock and smoothly.
8. When the pressure in the circuit rises to the system pressure, pressure is maintained. And the GST clutch is
maintained at engaging condition until the next gear shifting.
State of energizing of solenoid
(Forward)
(Reverse)
W1019092
N 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th
Solenoid 1(10) ON ON ON
Solenoid 2 (16) ON ON ON
Solenoid 3 (9) ON ON ON
Solenoid 4 (14) ON ON ON
Solenoid 5 (11) ON ON ON ON
Solenoid 6 (8) (ON) ON ON ON ON ON ON
N 1st 2nd 3rd 4th 5th 6th 7th 8th
Solenoid 1 (10) ON ON
Solenoid 2 (16) ON ON
Solenoid 3 (9) ON ON
Solenoid 4 (14) ON ON
Solenoid 6 (8) (ON) ON ON ON ON
No. Solenoid Color of wiring
(10) Solenoid 1 Black
(16) Solenoid 2 White
(9) Solenoid 3 Red
(14) Solenoid 4 Green
(11)
Solenoid 5, Sub-range
Lo-Hi
Blue
(8)
Solenoid 6,Main range
L-H
Yellow
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