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Discussion Forum
Show Parts for Model:

656 international hydraulic pumps

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Walter Allen

10-03-2002 07:56:23

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I have a 656 tractor I know that up until serial number 13,000 the tractor had a 12 gpm pump, after that serial number a 17 gpm pump was standard. My question is there a higher aftermarket gpm pump out there. I am running a secondary system plus an extra 2 valve setup so my hydraulics seem weak unless I rev up the engine.

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10-03-2002 10:04:44

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 Re: 656 international hydraulic pumps in reply to Walter Allen, 10-03-2002 07:56:23  
How can you get 2000PSI out of a 656 if it never had a 2000PSI relief valve 1600 PSI is what most came out with. If you have a 12 gallon pump and a 7 gallon which is 19 is 23 going to do that much more.

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10-03-2002 08:06:31

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 Re: 656 international hydraulic pumps in reply to Walter Allen, 10-03-2002 07:56:23  
If you have a fast or 3 point hitch that gives you 2 pumps so with the 12 gallon you should have had 17 and with the 17 gallon you should have 23 gallons so I would check out the system first sound like problem some place.

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10-03-2002 08:37:41

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 Re: Re: 656 international hydraulic pumps in reply to AceS, 10-03-2002 08:06:31  
12 GPM should be fine for almost anything. Are you running something like a hyd brush cutter that need a higher GPM.

I would first change the hyd filter and make sure that the cover plate dose not let air into the system. I would also listen for signs of air in the system or diverter valve associated with the power steering.

I would also pressure check the hyd couplings - I believe you should get close to 3,000 psi.

If you can't get into the 2,000 range I'd look at the pressure relief valve or diverter valve.

If all of this is ok it might be time for a new pump. The pump will first start to loose it's ability to put out the state volume at the higher pressures then loose its ability to get to the higher pressure with any volume.

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Walter Allen

10-03-2002 08:28:48

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 Re: Re: 656 international hydraulic pumps in reply to AceS, 10-03-2002 08:06:31  
I know that the front end loader and the steering are run off of a 17gpm pump and the rear hydraulics are run off a 7 gpm pump. The two pumps are segregated. I'm sure that the pumps are worn since this is a 1971 tractor. My problem is that a new 17 gpm pump might not be much better than the old one in there now. It would definitely be a $430 gamble. If someone makes a 20-24gpm aftermarket pump the gamble would be minimal.

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