Checking, Disassembling And Servicing; Checking And Adjusting; Bi-Speed Solenoid Valve - Kubota WSM STa-30 Workshop Manual

STα-30 · STα-35, WSM

4. CHECKING, DISASSEMBLING AND SERVICING

[1] CHECKING AND ADJUSTING

(1) Bi-speed Solenoid Valve

Bi-speed Solenoid Valve Relief Pressure
1. Jack up the rear wheels and shift the front wheel drive lever to
OFF position.
2. Remove the plug (1) then install the hydraulic test adaptor D (PT
1/8) and set a pressure tester.
3. Start the engine after warm up, measure the unload valve
operating pressure.
4. If the measurement is not within the factory specification, check
the operation of unload valve.
5. Set the bi-speed operating mode as follow.
- Range shift lever : 1
- Turn on the bi-speed : switch
- Turn the front wheel right or left to 0.61 rad. (35 °) and more
- Cruise control lever : 1 (Rotate the rear wheels)
6. Measure the bi-speed solenoid valve relief pressure.
measurement is not within the factory specification, adjsut the
relief pressure with adjusting screw (2).
CAUTION
• Be sure to disengage the front wheel drive, when checking
the bi-speed solenoid valve relief valve.
Unload valve operating
Factory spec.
pressure
Relief valve setting
Factory spec.
pressure
Condition
• Engine speed : Maximum
• Oil temperature : 45 to 55 °C
113 to 131 °F
(1) Plug
7-S5
BI-SPEED TURN
0.2 to 0.49 MPa
2
2.0 to 5.0 kgf/cm
28.45 to 71.11 psi
1.77 to 1.86 MPa
18.0 to 19.0 kgf/cm
256.01 to 270.24 psi
(2) Adjusting Screw
W1014483
KiSC issued 11, 2006 A
If the
2