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Lift question....

yeah....seen the whole assembly with the motor selling between 499-600 bucks...

thing is, it's not very old and doesn't see a whole lotta use... maybe 5 years old and I have used it maybe twenty times.. I might check some local hydraulic supply shops and see if I can buy just the parts I need..

gonna tear it apart this weekend...see what I can find..
 
My main concern is that the bypass valve setting might change if it has an adjustable one in the block that the pump bolts up to.

Taking it apart will disturb the setting. And there is no way to read line pressure to reset it. hopefully the problem will present itself as something obvious when I pull the pump apart.

I'm hoping someone who works with hydraulic systems will post up a few tips for me on setting up the bypass and bench testing the unit.

The major thing is, I have the pump unit with me up in Dallas....and the lift itself is in Houston. My hope was to take the unit to a shop here in Dallas and get it fixed before my next trip to Houston..
 
Unless you already have the tools/parts it would be cheaper to take it to a pump shop and have them test it. But if you have them:
Plumbed tank-pump-psi gauge-flow meter-adjustable restriction valve-tank. If there is a external return from the relief bypass make sure it has a clear path back to tank (these are often internal).
Power for the electric motor.
Fire up the pump with the restriction valve completely open, flow meter should read what the pump is rated for at max flow (guessing around 1.5gpm). less than 100psi.
Turn off the pump, partially close the restriction valve, turn pump on again. PSI should go up but maintain flow.
Turn off pump, close restriction valve, turn pump on again (don't run this test for long, only need a few seconds). Flow will end up reading nothing but pressure will be maxed which depending on the pump model is probably around 2500psi.

If the flow with no restriction matches the rated GPM then the pump is working. If the PSI doesn't reach the rated pressure then most likely the problem is in the relief valve. Usually caused by dirt in the fluid. A failed seal inside the pump can cause reduced flow or the pump to not reach rated pressure.

Bypass valve setting does not change quite that easily, usually requires loosening the lock nut and turning the valve (often allen head screw).
 
That's what I was looking for!

my thought is that I can take it apart and look for the obvious problem, and hopefully not have to disturb the relief valve setting.
but since it could be the problem, ( trash in it) I will loose the adjustment and then won't be able to set it properly again.

I guess if I don't see anything clearly broken or with trash in it, I will end up taking it to a shop for an estimate..
 
Relief valve might not even be adjustable (both styles are common). Main things you will find in the pump if it's damaged are dirt and orings that were nicked/cut/rolled/etc.

Wear gloves, hydraulic oil softens the skin fast and you will get cut absurdly easy without realizing it.

Wouldn't hurt to call one of those hydraulic pump shops and ask their charge just to test the pump. Little pump like that shouldn't take them any more than 1/2 an hour.
 
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