DEFINITION: The hiss is a high frequency noise that often occurs at a standstill.

1

Check the relief valve in the hydraulic pump.

Is the relief valve noisy?

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Go to Step 2

Go to Step 3

The noise may not affect the performance of the steering. A hiss occurs when the steering wheel is at the end of travel. A hiss also occurs when the steering wheel is slowly turning at a standstill.

Is the hiss extremely objectionable?

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Go to Step 3

System OK

Replace the relief valve.

Does the hiss persist?

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System OK