Power Steering Bleeding: System Information, Service and Repair
Power Steering Bleeding: Service and Repair
After any power steering system component has been replaced, fluid line has been disconnected, or even in case of steering system noise, the air that
has-entered the system must be bled out before the vehicle is operated: This will ensure proper system operation, prevent pump damage and stop steering
system noise.
INSPECT
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Hoses for contact with any part of the vehicle which could cause steering system noise.
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Hoses to ensure all connections are tight. A loose connection may not leak but could allow air into the system.
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Multiple ribbed belt for tightness.
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Pulley for looseness or damage. The pulley should not wobble with the engine running.
BLEEDING PROCEDURE
1. Switch ignition OFF.
2. Turn steering wheel full left.
3. Fill fluid reservoir to FULL COLD level. Leave cap off.
4. Raise front wheels off ground.
5. With assistant checking fluid level and condition, turn steering wheel lock-to-lock at least 20 times. Engine remains OFF.
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On systems with long return lines or fluid coolers, turn steering wheel lock-to-lock at least 40 times.
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Trapped air may cause fluid to overflow. Thoroughly clean any spilled fluid to allow for leak check.
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Keep fluid level at FULL COLD.
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Be alert to periodic bubbles that could indicate a loose connection or leaky O-ring seal.
6. While turning wheel, check fluid constantly.
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No bubbles are allowed.
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For any sign of bubbles, recheck connections. Repeat Step
5.
7. Start engine. With engine idling, maintain fluid level. Reinstall cap.
8. Return wheels to center. Lower front wheels to ground.
9. Keep engine running for two minutes.
10. Turn steering wheel in both directions.
IMPORTANT:
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Verify smooth power assist.
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Verify noiseless operation.
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Verify proper fluid level.
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Verify no system leaks.
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Verify proper fluid condition.
11. If all proper conditions apply, procedure is complete.
12. If any problem remains, see Special Conditions.
SPECIAL CONDITIONS
1. Fluid must be completely free of bubbles and discoloration. If either condition is evident, switch ignition off. Wait two minutes. Recheck hose
connections. Repeat Steps 7-10. If condition still exists, replace O-ring seals and hose clamps. Fill system and repeat bleed procedure.
2. If pump whine or groan is noted, start engine and recheck hoses for possible contact with frame body or engine. If no contact is found, follow
either following method to cool down fluid and repressurize system. After either method of cooling, start engine and allow engine to come up to
operating temperature. If noise persists, remove and replace power steering pump. Repeat bleed procedure following pump replacement.
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Normal cool down.
A. Switch engine OFF.
B. Wait for system to cool.
C. Install reservoir cap.
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Partial fluid replacement.
A. Switch engine OFF.
B. Use a suction device to remove fluid from reservoir.
C. Refill with cool, clean fluid.
D. Install reservoir cap.