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Message: <blockquote data-quote="Bswwood" data-source="post: 107558" data-attributes="member: 17639"><p>You can test the pump itself, ideally you would want a flow control valve to do this, however I understand not everybody has access to these tools. The method I'm about to describe can be dangerous if the pump is in good condition. You will not have a relief valve in line. You have already tested pressure at the auxiliary port and ruled out the main relief so it definitely sounds like your pump is bad. Pull the main pump hose off the valve body, using adapters make tee fitting to hook on to the main pump hose, a gauge in one side, a ball valve on the other side and a hose returning to tank. Just remove the cap off the hydraulic tank and drop the hose in it. With the ball valve open start the machine and slowly close the ball valve and see if you make more than the 1500 PSI you are getting at the auxiliary port. Again you have to be very careful because if you close the ball valve all the way something is going to give somewhere. If your pump is low-flow / low pressure then you could probably close the ball valve all the way without killing the engine. Again it's not recommended to do it this way but it is possible. Used hydraulic fittings and a steel ball valve not brass. However if you use brass I guess that could be the relief valve LOL.</p></blockquote><p></p>