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I Need to Test My Tractor Steering System

We want to help you test your tractor steering system.

If you do not feel that you understand these steps, or can perform them safely, consult your tractor dealer or local mechanic. Also always consult your tractor owner’s manual for model-specific information.

To complete this task you will need to purchase a torque wrench and plugs (hydraulic lines).

Time to get started.

Why do we test the steering system? It is to check three things (internal leakage, steering cylinder operation, and the PST valve assembly).


For the steering hydraulics to operate normally:

- The oil pressure must be within the specifications.

- The hydraulic oil must flow normally from the pumps.

  • Before testing the steering components, make sure that there are no defective pumps.

  • Make sure that the hydraulic pump assembly is operating normally.


1. Start and run the engine until the hydraulic oil is at operating temperature.

2. Fully rotate the steering wheel in the clockwise direction.

3. Using a torque wrench (A, Fig. 1) rotate the steering wheel by the retaining nut (B Fig. 1) fully counterclockwise or counterclockwise.

- Apply the torque per the service manual.

A - Torque wrench

B - Retaining nut (5/8-18 UNF)

4. Do the preceding procedure for the full turn position.

5. Shut down the engine.

Results Interpretation/Remedies

  • If the steering wheel rpm (in either direction) exceeds 5, the steering system has an internal leak.

  • Proceed to the next procedure to determine whether the leak is located in either the steering cylinder and PST valve assembly.