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Tool Talk Discussion Forum

Bench test a hydraulic pump?

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markiz41

07-24-2007 06:24:54




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I'm deep into fixin' the hydraulics on my IH. Had to pull the radiator out and found out the spline drive for the hyd. pump had gotten pretty loose. I can fix that, but before I do all this work I would like to test the pump to see if it's still strong. The local JD dealer said "no go" - once the pump is off the tractor they cannot test it. Who would have the right equipment for this? Appreciate any info on this.

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Rudy2

07-24-2007 16:17:51




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 Re: Bench test a hydraulic pump? in reply to markiz41, 07-24-2007 06:24:54  
What Goldie says is correct. Any sizeable city should have several hydraulic rebuild shops and a pump test bench is a common tool in that business. Biggest stumbling block will be if they have the necessary drive to turn your particular spline etc. I would guess that an IH pump would be fairly common so would not expect problems. If it were European you might have less of a chance. I think I checked on this for my tractor several years ago and minimum charge for the test wasn't real cheap.

Randy

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markiz41

07-24-2007 20:41:23




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 it's a Cross pump in reply to Rudy2, 07-24-2007 16:17:51  
And I'll bet the farm it's not OEM. Doesn't really matter. I tore into some more tonight - separated the spline driveshaft from the pump and off the crank. The splines on the pump input shaft are toast. Whoever worked on this before me attached the driveshaft flange to the crank pulley with a weird combo of bushings, spacers, washers and rubber grommets! Pretty hack job, the whole thing loosened and was banging around in there for who knows how long. I think I'll start from scratch here, doubt that anything could be salvaged.

Thanks very much for all the advice.

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Goldie

07-24-2007 13:33:50




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 Re: Bench test a hydraulic pump? in reply to markiz41, 07-24-2007 06:24:54  
I worked at a hydraulic shop and we could test any configuration of pumps. If a shop has a $20k test stand they will have the hardware to test your pump. I would probly just rebuild it if it was mine.



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Jerry/MT

07-24-2007 10:44:00




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 Re: Bench test a hydraulic pump? in reply to markiz41, 07-24-2007 06:24:54  
Testing a pump for max pressure is a realitvely easy, but to check it for flow AND pressure is not that easy unless you are willing to buy a valve to throttle the system, build and calibrate a large tank with a return pump or spend some bucks for a flowmeter. If you were having problems, rebuild it or replace it with a rebuilt pump as long as you have it out.
If it was my unit, I'd probably rebuild it since i'd all ready done the hardest part;getting it out.

Just my opinion.

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markiz41

07-24-2007 10:41:38




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 Just FYI, you guys in reply to markiz41, 07-24-2007 06:24:54  
Got on the phone with a hydraulic shop - they have the equipment but won't test an old pump. Reason: if the pump is trashed or contaminated, there goes their system too. Think I'll try to score a new pump at this point..



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Jerry/MT

07-24-2007 17:43:37




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 Re: Just FYI, you guys in reply to markiz41, 07-24-2007 10:41:38  
What a bunch of BS! Haven't they ever heard of filters! What do they test, new and rebuilt pumps only? Find another shop.



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dej(Jed)

07-24-2007 09:42:48




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 Re: Bench test a hydraulic pump? in reply to markiz41, 07-24-2007 06:24:54  
Midwest Rednick offers the best advice. Build your own setup to measure flow, pressure and gpm. I really doubt you will find anyone set up to test hydraulic pumps. There would be way to many different ones avaiable to make it worth the trouble to set up to do.



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midwest redneck

07-24-2007 09:19:30




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 Re: Bench test a hydraulic pump? in reply to markiz41, 07-24-2007 06:24:54  
You may be able to make (or get) a bracket to mount the pump up to a test stand that will rotate the pump and check flow and pressure.



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old

07-24-2007 08:48:12




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 Re: Bench test a hydraulic pump? in reply to markiz41, 07-24-2007 06:24:54  
A good hyds shop maybe able to help you on that. I would think they would have a way to test stuff but I can not be 100% sure. I know if its stil hooked up to the tractor its easy to test but once off not so easy. If it can still be turned by the tractor engine it would only take 2 minutes of run time to know if it was still putting out what it should be by putting a pressure guage in the high pressure side of the system

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larry in tn

07-24-2007 07:00:08




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 Re: Bench test a hydraulic pump? in reply to markiz41, 07-24-2007 06:24:54  
No mechanical advice here.If getting to the pump is a major job and you've gotten this close, rebuild or repace the pump.



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