Help I have a 1960 Adams Road Grader, the power assist unit has quit working. I had a shop do repair work in the valve and piston with new seals and repaired some damage inside the valve unit. It will steer a bit when backing up, nothing when going forward. In reading the shop manual, says that the unit must be plugged with debris at different points of the system. The manual says there is a filter that needs checked but cannot find the filter, is it inside the supply canister perhaps ? Then it talks about more debris inside some regulators but hesitant to take apart until i get some advice. Anyone got some ideas or experiences ? jd
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