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Here is an instruction show you guide on how to perform steering gear box service for Kubota L3301/L3901 tractor. 

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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.

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.

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.

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.
 

NOTE
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.

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