Sorry. I didn't have more time to respond to your last post. It sounds like your 4000 has the gear pump in the center housing. There should be a pressure port in the face of the pump. You can connect a test line to this pressure tap. Unfortunately you're going to need more than just a pressure gauge. You need a high pressure line to tap the pump. On the other side of the high pressure line you install a Tee and pressure gauge. You then exit the Tee with another high pressure line and run it to a high pressure valve. This is called a load valve and it enables you to restrict the flow of high pressure oil through your test line which places a load on the pump and registers pressure on the gauge. You run a low pressure line out the other side of the load valve back to the fill plug in the center housing so the oil circulates out of the pump and back into the hydraulic system.
This post was edited by Check Break at 21:29:37 05/27/13 2 times.
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