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Message: <blockquote data-quote="onyxtour" data-source="post: 5083" data-attributes="member: 740"><p>I see yours is valve operated. My motor is just like the pumps, all driven by 9 pistons each. I like seeing though that they use vaseline on the gaskets and o-rings. Question: If you go to the NH web site you can go to service and parts and search for parts by model number. There in figure 104 it shows a pressure switch that controls the flow to my servos. Remember now I swapped out the servo before (calling them hydrostatic pumps), left for right and right for left, and the left side (where I'm having the wheel problem) worked properly on the right side. However, if the pressure switch is bad my swapping established nothing. Am I correct? Or, in the full scheme of things, as long as the control arm is moved to adjust the swash plates flow does this pressure plate make a bit of difference? Question: I have two relief valves at the top of each piston pump where the fluid comes into the pumps from the filter. Can these relief valves be malfunctioning to the point that this is the problem; and can I just swap them out i.e. take the ones out of the rear pump, that I'm having the problems (if it is the pump) and put them in the forward pump just to see if their the culprit?</p></blockquote><p></p>