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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

How do you test pressure on Hyd Pump?

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Bob up north

11-04-2007 18:07:35




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I purchased a small loader and think that the relief pressure setting is set to low, under specification, How does one test the hydrulic pump pressure? Its a Vickers Vane Type double pump model 25VQ-17GPM




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NC Wayne

11-04-2007 19:35:14




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 Re: How do you test pressure on Hyd Pump? in reply to Bob up north, 11-04-2007 18:07:35  
Find a function that the pump supplies pressure to. I say this because many machines have multiple pumps and each operates different functions and I don't know exactly how your machine is set up. In general though, first check for a pressure tap that's designed to be used for testing pump pressure. If you don't find one then you'll need to tee into a line somewhere. The best place to tee in is on the line going to a function, like a cyliner, where you can "deadhead" the pump flow. On a loader you can use pretty much any cylinder but a good spot is on the "raise" (bottom) port on the boom lift cylinder. It's usually close to the operator so you don't have to have a long guage line and you can raise the boom and deadhead the flow easily. Any port that's easily accesable is fine but for the sake of an example I'll use the boom cylinder. First lower the bucket to the ground and make sure there is no pressure remaining on the system. Next break the line and install a tee and then connect your guage. Now raise the bucket in the air til the boom cylinders reach the end of their stroke and "bottom out". Keep the control lever pulled for a second after the cylinder bottoms and let pressure rise then release the lever. Now watch your guage and pull the lever again. You should see the pressure rise and peak and then either stop at a set pressure or drop slightly. When this happens read the pressure on the guage. Providing the port relief is set higher than the main relief, and it usually is, the pressure holding on the guage should give you a fairely accurate reading on the relief pressure.

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