STV32 · STV36 · STV40, WSM STEERING
7-S4
4. CHECKING, DISASSEMBLING AND SERVICING
[1] CHECKING AND ADJUSTING
Steering Wheel Operating Force
1. Park the tractor on flat concrete place.
2. Start the engine. After warming up, set the engine speed at
maximum speed.
3. Set a spring balance to the steering wheel to measure the
operating force.
4. Calculate the operating torque.
5. If the torque exceeds the factory specification, check the
suction line, delivery line, and the performance of hydraulic
pump.
And then, check the steering controller.
Condition
A Engine speed ........ Maximum
A Oil temperature ..... 40 to 60 (104 to 140 )
A Tractor by itself (without any implement and weight)
[2] DISASSEMBLING AND ASSEMBLING
(1) Steering Controller
Disassembling Procedure
See page 3-S17, 18.
A Refer to the "8. HYDRAULIC SYSTEM" for hydraulic pump and steering controller.
A Use only the transmission fluid (see page G-8), in no case mixture of oils of different brands.
A Do not disassemble the hydraulic pump and steering controller needlessly.
A After installing or reassembling the power steering hydraulic components, be sure to bleed air.
(Bleeding)
A Start the engine, then turn the steering wheel slowly in both directions all the way alternately several times, and
stop the engine.
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Steering wheel
operating torque
Factory spec.
1.0 to 2.0
0.10 to 0.20
0.72 to 1.45 ft-lbs
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A Refer to the "8. HYDRAULIC SYSTEM" for hydraulic pump.
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