wsm M8540NARROW, Workshop Manual

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TRANSMISSION M8540Narrow, M9540Narrow, WSM
N3-M3
2. POWER TRAIN FOR TRAVELING GEAR
[1] BI-SPEED TURN SYSTEM
(1) 2WD-4WD-Bi-speed Turn
The Bi-speed turn clutch is controlled by the combination of the solenoid valve and the hydraulic flow.
When the 4WD / Bi-speed turn switch is pushed once, the front wheel drive (4WD) is engaged. When it is pushed
twice, the Bi-speed turn system works. When it is pushed once more, the 2-wheel drive is engaged. The power train
are available as follows.
2-wheel drive (4WD / Bi-speed turn switch is turned to "OFF")
• The hydraulic system pressure is fed to between the neutral cover (3) and 4WD piston (4) at 4WD switch is turned
to "OFF" and hydraulic pressure does not come from 4WD / Bi-speed turn solenoid valve to actuate the 4WD
piston (4). So, the hydraulic system pressure actuate the 4WD piston (4) to the neutral position and power is not
transmitted from 36T gear (2) to DT propeller shaft (1).
• When both brake pedals are depressed together while driving in 2WD mode, 2-brake switch operate the 4WD /
Bi-speed turn solenoid valve and activate to the 4WD mode. 4WD mode activate the 4WD braking system and
the 4WD indicator lights up.
4-wheel drive (4WD / Bi-speed turn switch is turned to "4WD")
• The 4WD / Bi-speed turn solenoid valve switches and supply the hydraulic pressure to actuate the 4WD piston
(4) to engage the clutch pack together with the spring (5) tension force.
The power is transmitted as follow.
36T Gear (2)
→ 31T Gear (14) → Clutch Body (6) → 4WD / Bi-speed Turn Shaft (9) → DT Propeller Shaft (1).
Engine stop
• The 4WD piston (4) engage to 4WD mode by spring (5) tension force.
Bi-speed turn drive (4WD / Bi-speed turn switch is turned to "Bi-speed turn")
• When front wheels reach approximately 0.56 rad (32 °) turning angle, its turning angle inspection switch is pushed
to "ON" position and solenoid valve is operated. As a result, the Bi-speed turn is hydraulically engaged and the
front wheel is revolved 1.6 times as many revolutions as the rear one.
• Bi-speed turn operates during the 0.1 to 7.2 km/h (0.063 to 4.4 m/h) traveling speed with 380/70R28 rear tire.
When the traveling speed is not within the specified speed, bi-speed turn does not operated.
36T Gear (2)
→ 31T Gear (14) → 20T Gear (13) → Bi-speed Turn Shaft (12) → 27T Gear (10) → 26T Gear (7)
→ Clutch Body (6) → 4WD / Bi-speed Turn Shaft (9) → DT Propeller Shaft (1).
9Y1210236TRM0003US0
(1) DT Propeller Shaft
(2) 36T Gear
(3) Neutral Cover
(4) 4WD Position
(5) Spring
(6) Clutch Body
(7) 26T Gear
(8) Return Spring
(9) 4WD / Bi-speed Turn Shaft
(10) 27T Gear
(11) Bi-speed Turn Piston
(12) Bi-speed Turn Shaft
(13) 20T Gear
(14) 31T Gear
A: 4WD
B: Bi-speed Turn
KiSC issued 07, 2013 A