If the fluid level is OK air is probably entering the system and causing the relief valve to chatter.
First to check is the ÔOÕ ring. Refer how to section for details on this easy fix. Even when there is no visible fluid leak air can be entering at this point.
Next check all fluid lines and connections for leaks. From there on you are into deeper water.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit!
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