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Causes of air ingress in steering gear system

1. Defective gland of the ram cylinder: If the gland is not holding during the suction stroke of that  cylinder, air may ingress into the system.
2. Oil tank low level.

3. Improper charging of oil into the system.
4. Union nut is slack due to vibration.
5. Gassing up of hydraulic fluid due to local high temperature in the system.
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