I have a 175b loader with a new hydraulic pump but no hydraulic pressure. I didn't know if there is a relief valve that need to be checked. Any comments would be helpful. Originally the hydraulics were working fine and then all of a sudden quick working.
Are you sure the pump is being driven?
yes, We took off the pressure hose and are getting lots for flow when we start the engine. I think its the main pressure relief valve but don't know what to look for if we take it apart.
Does it have a quick attach bracket?
just a regular bucket not a quick attach.
Are all functions weak? I was hoping for a quick attach bracket. Sometimes guys bump the switch and lose working hydraulics. Can you boom down strong? You may have lost servo pressure by itself. If that's the case, you'll need a service manual. There's a valve in the lower frame which limits pump flow to servo oil. Should be like 450-500 if I remember correctly. The other side is for brake charging. Also do your levers feel dead or do you feel oil under the plungers. Do you have steering and brakes?
Follow the discharge hose to the main valve. It probably a husco valve above the front axle like my 275b. In that valve will be the relief valve on it. Ahould be one with a smaller allen bolted cover. Do you have your serial number? A place called sycamore enterprises sells service manual for Clarks and Michigan's also minnpar has parts books on their website that you might get an idea or two from. If the loader is moving like your transmission is functioning it's not the fiber gear on your flywheel. But sounds like your just dumping fluid back to tank. The steering system also has a relief valve
There is also a Facebook group for the Clark loaders Michigan/Clark equipment co