82410 • 82710 • 82910 WSM, 12271
7 STEERING
[2] POWER STEERING
CHECKING
• 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.
12010870040
Steering Wheel Play
1.
Refer to the backlash between sector gear shaft and rack
(piston)
on
page 7-S12.
Power steering wheel
play
Reference value
5.0 to 30.0
mm
0.2 to 1.2 in.
12270870200
Steering wheel
Less than 10 N
Factory spec. 1.2 kgf
operating force
2.21bs
2270P70060
Steering Wheel Operating Force
1.
Park the tractor
on
flat concrete place.
2.
Start the engine. After warming up, set the engine speed at
approx.
2600 rpm.
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 Approx. 2600
rpm
• Oil temperature .45 to
55°C
113 to
131°F
• Tractor by itself
(without any implement and weight)
12270870100
Condition
• Engine speed Approx. 2600
rpm
• Oil temperature .45 to
55°C
113 to
131°F
Relief Valve Setting Pressure
1.
Open the bonnet and disconnect the battery grounding cord.
2.
Remove the meter panel and panel under cover.
3.
Remove the plug of power steering body and then set the relief
valve pressure tester (use adaptor D).
4. Start the engine. After warming up, set the engine speed at
approx. 2600 rpm.
5.
Fully turn the steering wheel to the left end to read the relief
pressure. After reading, stop the engine.
6.
If the pressure
is
not factory specification, check the pump
delivery line and adjust the relief valve setting pressure (Refer to
7-S8).
Power steering relief
11.3 to 12.3 MPa
Factory spec.
115 to 125 kgf/cm
2
valve setting pressure
1636 to 1778 psi
12270870110
7-S7
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