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82410 • 82710 • 82910 WSM, 12271
7 STEERING
Valve Assembly and Rack (Piston)
1. Remove the valve housing mounting hex. head screws.
2. Draw out the valve assembly and rack (piston) as a unit.
(When reassembling)
Valve housing mounting
39.2 to 49.0 N·m
Tightening torque
hex. head screw
4.0 to 5.0 kgf·m
28.9 to 36.2 ft-Ibs
12270870140
(1) Valve Housing
(2) Plug
12010F70100
(1) Valve Housing
(2) Relief Valve Poppet
(3) Relief Spring
SERVICING
3
(3) Worm Shaft
(4) O-ring
(5) Adjusting Screw
(6) Lock Nut
Valve Assembly
1. Remove the plug (2).
2. Pull out the worm shaft (3) with sleeve and stub shaft from valve
housing (1).
(When reassembling)
• When tighten the plug, use the PS plug wrench (Refer to G-40).
• Be sure to tighten the plug to specified torque and staking the
plug (2).
If the plug is tightened to excessive torque, it may cause damage
to the thrust races and thrust bearings.
8.8 to 10.8 N·m
Tightening torque
Plug
0.9 to 1.1 kgf·m
6.5 to 8.0 ft-Ibs
12271870040
Disassembling Valve Housing
•
IMPORTANT
• Do not disassemble the relief valve needlessly, since it has
been factory-adjusted.
• If the relief valve is disassembled, replace the adjusting
screw with new one, and after reassembly, be sure to adjust
the setting pressure, then stake the adjusting screw with a
punch.
Relief pressure adjusting
49.1 to 78.5 N·m
Tightening torque
5.0 to 8.0 kgf·m
screw lock nut
36.2 to 57.8 ft-Ibs
12270870220
2270P70120
Clearance between Steering Gear Box and Rack (Piston)
1. Measure the steering gear box cylinder 1.0. with a cylinder
gauge.
2. Measure the rack (piston) 0.0. with an outside micrometer, and
calculate this clearance.
3. If the clearance exceeds the allowable limit, replace the steering
gear box or rack (piston) assembly.
Factory spec.
0.030 to 0.079 mm
Clearance between
0.0012 to 0.0031 in.
steering gear box and
0.14 mm
rack (piston)
Allowable limit
0.0055 in.
12270870160
7-S11
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Troubleshooting
