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so far as i had beeb reading here in this forum it has continious flow abd presaure should build up only when there is demand for that. do i miss something?

Hello. Sorry to pick up old topic but i am working on same tractor what has same proble. Hydrolic system just refuse to build up pressure. I changed all O rings on valves and inside pump and still nothing. Problem started when pump started catching air in. Reason was simmer on main shaft and...