Unfortunately, the P.O. is deceased and dead men tell no tales! The saw was donated to our trail club by his widow.Once you have, come back here with a full back story on it mate. Where you got it, why you got it, when the troubles started, what the previous owner said etc.
On deck next round before I remove it from the saw.From there - start pressure testing it, both metering side and pump side.
How do you check this and come up with numbers? The only test that I have ever seen is with a piece of hose and blow/suck on the "H" circuit and listen for the check valve to click each way. Since these are FRP I wouldn't expect them to seal completely when closed whereas some of the old rubber discs might.Test the main nozzle check valve holds or drops no quicker than 7 psi over 5 seconds.
Done and verified.Confirm lever height is set and the seals for the needles if present are in good order.
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