Kubota WSM STa-30, Workshop Manual

Page: 270 / 359

8-S5
ST
α
-30 · ST
α
-35, WSM STEERING
Pump Test
NOTE
■
• Before pump testing, perform the flowmeter connecting and
test preparation.
1. Open the loading valve completely.
2. Start the engine and set at approx. 2800 rpm.
3. Read and note the pump delivery at no pressure.
4. Slowly close the loading valve to increase pressure approx. 13.2
MPa (135 kgf/cm
2
, 1920 psi).
5. Read and note the pump flow at rated pressure.
6. Open the loading valve and stop the engine.
(Reference)
Condition
• Engine speed .......... Approx. 2800 rpm
• Rated pressure ....... 13.2 MPa
135 kgf/cm
2
1920 psi
• Oil temperature ....... 50 °C
122 °F
W1012184
(2) Power Steering
IMPORTANT
■
• Use only the transmission fluid (See page G-8), in no case use mixture of oils of different brands.
• Do not disassemble the hydraulic pump and power steering needlessly.
• After installing or reassembling the power steering hydraulic components, be sure to bleed air.
(Bleeding)
• Start the engine, then turn the steering wheel slowly in both directions all the way alternately several times, and
stop the engine.
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. If the measurement exceeds the factory specification, check the
suction line, delivery line, and the performance of hydraulic
pump.
And then, check the power steering assembly.
Condition
• Engine speed ....... Maximum
• Oil temperature .... 45 to 55 °C
113 to 131 °F
• Tractor by itself (without any implement and weight)
W1012719
Hydraulic pump delivery
at no pressure
Factory spec.
14.0 L/min.
3.7 U.S.gal/min.
3.08 Imp.gal/min.
Hydraulic pump delivery
at rated pressure
Factory spec.
12.1 L/min.
3.19 U.S.gal/min.
2.66 Imp.gal/min.
Steering wheel
operating force
Factory spec.
2.5 to 3.5 N
0.25 to 0.35 kgf
0.55 to 0.77 lbs
KiSC issued 11, 2006 A