STEERING
L3301, L3901, L4701, WSM
7-S21
(2) Steering Gear Box
Backlash between Sector Gear and Ball Nut
1. Set a dial indicator with its finger on the pitman arm.
2. Move the pitman arm lightly, and measure the pitman arm
deflection.
3. If the measurement is not within the factory specifications,
adjust the backlash with the adjusting screw.
9Y1211012STS0031US0
Clearance between Valve Housing and Sleeve
1. Measure the sleeve O.D. with an outside micrometer.
2. Measure the valve housing I.D. with a caliper gauge.
3. If the clearance exceeds the allowable limit, replace the steering
gear box assembly.
9Y1211012STS0032US0
Clearance between Gear Box and Ball Nut
1. Measure the gear box cylinder I.D. with a cylinder gauge.
2. Measure the ball nut O.D. with an outside micrometer.
3. If the clearance exceeds the factory specifications, replace the
steering gear box assembly.
9Y1211012STS0033US0
Axial Play of Ball Nut Assembly
1. Set a dial indicator with its finger on the worm shaft of the ball
nut assembly.
2. Move the worm shaft axially and measure the play.
3. If the play exceeds the allowable limit, replace the steering gear
box assembly.
• Check ball nut assembly for smooth rotation by holding the
ball nut horizontally, and slowly rotating the worm shaft. If
rotation is not smooth, replace the steering gear box
assembly.
9Y1211012STS0034US0
Backlash between sector
gear and ball nut
Factory specification
0.3 mm
0.01 in.
Clearance between
valve housing and spool
Factory specification
0.17 to 0.28 mm
0.0067 to 0.011 in.
Allowable limit
0.4 mm
0.02 in.
Clearance between gear
box and ball nut
Factory specification
0.035 to 0.080 mm
0.0014 to 0.0031 in.
Allowable limit
0.15 mm
0.0059 in.
Axial play of ball nut
assembly
Factory specification
0.02 mm
0.0008 in.
Allowable limit
0.04 mm
0.001 in.
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