OK, if the wear plates are good then put it back together exactly as it came apart, i.e., the plates on the same side and the exact thickness of gasket(s) on the side covers. It should turn freely with the aid of a wrench but not by hand. Make sure the valve will push in and out it's full travel and has no obstructions. Reinstall to the manifold and if you can put a tee into the connection to a pressure gauge. It should make about 1000-1200 psi or so. If it does then the pump passes. Straighten the valve linkage so it operates freely. Do not use any teflon tape on the fittings as it comes off and screws things up.
St Paul Hydraulics became part of the old GarWood company. Unfortunately the only parts your likely to find will be at the bone yard. If the pump is hot then it must be replaced with a modern gear pump of about 12-15 GPM @1000 RPM size.
Last edited by 53moneypit; 03/28/2009 6:14 PM.
