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Old 04-24-2015, 08:55 AM   #29
Ski in NC
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City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
You mentioned a variable displacement pump- If so it is likely a tilting swashplate machine with some sort of hydraulic control that move the swashplate. Since it also runs the stabilizers that use very little flow, and that the pump runs all the time, it probably spends 99% of the time with very little tilt to the plate. Maybe something is a bit worn there and it hangs up transitioning to full flow.

You mentioned that pressure read low when acting up, that observation supports the above.

Belts not slipping, that's off the list.

Something does the "two speed" thing, that would be a suspect, but you noted you still get two speeds but both are weak, that plus seeing lower pressure points to the two speed thing working ok.

Filters not likely as a clog would not resolve itself, usually.

I would be looking at the pump.

Schematics would be REALLY helpful. Could be full of little hyd gadgets that could do the same thing.
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