Testing a hydraulic pump

[bobcube]

Hi, is there any way of testing a hydraulic pump off the tractor?
I recently ran low on hydraulic fluid in my International 434. After I refilled, the hydraulics gradually gave up after a couple of sessions.
I've checked the usual things, filters etc.. Now, having removed the hydraulic gear pump, I'm wondering how to tell if it's OK. Everything seems good - no missing teeth on the gears etc.
When I manually turn it over, should I expect any suction if I block the supply holes?

Cheers

Bob

 

[mrmikey]

Only proper way to tell is put as pressure/flow test on it. Think of it this way, with absolutely no backpressure, i.e. oil being pumped into a bucket, you could have 10 gpm flow. Put a bit of back pressure on it, 2-600 psi and the flow could drop to almost zero as there'd be leakage past the gears, end caps etc.
Best way is get a flowmeter when the pump is on the tractor or, take it to a shop that has one and can run it on a bench..............Mike

 

[jenkinsph]

I agree with the above ^^^^

The gears and parts may look good but that does not mean much. Testing under pressure and flow on a bench is the way to go.

 

[Xfaxman]

Two questions.

1. What type hydraulic fluid or motor oil does International specify for it?

2. What type hydraulic fluid or motor oil did you put in it?

 

[wdchyd]

Hi, is there any way of testing a hydraulic pump off the tractor?

Yep........(click on pix)

 

[wdchyd]

http://vid1116.photobucket.com/albums/k571/e-fishin-c/2011 Videos/Flow Test Fail_zpsmeslsr0y.mp4

http://vid1116.photobucket.com/albums/k571/e-fishin-c/2011 Videos/Flow test Pass_zpsbr7x4qpt.mp4

sorry trying to get linky to worky

 

[Alesandro]

wdchyd;

How much does a test like that usually run? I'm really new to tractors and hydraulics. I got a Mitsubishi MT 372 D/Satoh 370 Beaver tractor to move dirt. It seems to run fine after startup but not fully warm. After I move dirt around for a while or just drive around, I lose hydraulic power to lift the bucket. Yesterday, I swapped lines from the bucket tilt and bucket lift to verify it wasn't my valve and I still lost power after a little bit of working. I bought a used hydraulic pump and the seller guarantee's the pump works. I want to take the pump when I receive it to some place to get it tested before I put it in my tractor and verify it meets some standards before I install it.

 

[Alesandro]

wdchyd;

How much does a test like that usually run? I'm really new to tractors and hydraulics. I got a Mitsubishi MT 372 D/Satoh 370 Beaver tractor to move dirt. It seems to run fine after startup but not fully warm. After I move dirt around for a while or just drive around, I lose hydraulic power to lift the bucket. Yesterday, I swapped lines from the bucket tilt and bucket lift to verify it wasn't my valve and I still lost power after a little bit of working. I bought a used hydraulic pump and the seller guarantee's the pump works. I want to take the pump when I receive it to some place to get it tested before I put it in my tractor and verify it meets some standards before I install it.

 

[jenkinsph]

Why not test the pump before you buy it? Make the necessary arrangements with the seller who "guarantee's the pump works" to have this pump tested. I would rather gamble on the testing fee than the pump cost and the testing fee. Trust but verify comes to mind.

 

[Alesandro]

I talked with the guy who is selling the pump, he's from Pa. and I'm from Id. I didn't know something like this existed so I'll test it before I install it. If it doesn't test out, I'll either record it or have something from the testing facility stating so. If he's stand up then it'll just get shipped back. He's on e-bay and I paid with a CC so getting a refund shouldn't be to hard.