JD model 70 hydraulic output

Paul Hearsey · May 4, 2016

I had a look in the archived articles and couldn't find this question. I have an almost restored 1955 Model 70 gas tractor, and I'd like to use it to run a few implements, like a rock picker. Unfortunately I do not have a rockshaft-equipped tractor (when I bought it I didn't notice. Duh!) but I can still pull things and use the hydraulics.

Question: what is the output of the pump in gpm or lpm at full engine speed? I'd like to run, say, a Riteway rock picker which requires 12-15gpm or 45-57lpm at 1200-1500psi. I know these old tractors can't do anything like this, but I'm hoping I can still get some work done. My wife keeps asking why we bought it.

Any comments, too, about what readers can or can not run with their old John Deeres? I saw one post in which an owner ran a log splitter successfully.

Mike M · May 4, 2016

No rockshaft but you have hydraulics ? That is an odd combination for sure. I doubt it has the flow or pressure to handle it right.

Joe Way · May 4, 2016

Does it have a PTO? If so, you could fit a PTO-driven pump to suit your needs.

buickanddeere · May 4, 2016

Duane Larson's collection of factory service bulletins contain the specs . Iirc 8-9gpm at 1350psi break out when redlined
Given the age and wear of the pump. The rock picker maybe a bit low on rpms .
Can't do any harm giving it a try.

coonie minnie · May 4, 2016

To use your 70 there successfully, some type of PTO hydraulic pump and resevoir might be better than the Power Trol. Our 70 is currently running the corn starter fertilizer wagon (with hydraulic auger), and
it will run that orbit motor.

However in that situation, it runs for a few minutes, and then can cool off. The hydraulic system on the 70 was more advanced than the competition's in the day, but really wasn't designed to run orbit motors
continuously. There is no filtration system, no cooler, and a small resevoir.

A few years back in Green Magazine, someone had hung a good sized backhoe on a 70. He mentioned how the narrow front made it able to get in tight spaces, etc. But he had made up a different hydraulic system
with a PTO pump.

Good luck.

Paul Hearsey · May 5, 2016

Thanks, guys, for some great ideas. Yes, this tractor does NOT have a rockshaft/three point hitch. Too bad for me. It does have the Power-Trol pump, and a control lever to the right of the driver's seat. It has the two outputs with dummy plugs. At one time it was used to drive some sort of hydraulic cylinder on who-knows-what. I found this tractor working in a gravel pit.

I think I just might try using the hydraulics to run a rock picker. Just to satisfy my curiosity. Then I'll probably take the better route: set up a PTO pump and reservoir. That makes so much more sense. Don't know why I didn't think of that myself; I have a backhoe on a 1986 30hp Kubota with that very setup!

Thanks again, guys!

Mike M · May 5, 2016

Orbit motors will also burn out the pump idler gear bushing as it really does not lube very well. This is on the gas engine models a diesel hyd. pump is on the bottom and does not use the same set up.

Paul Hearsey · May 5, 2016

Good point, Mike M. As a matter of fact, I had to replace that idler gear and its shaft because of excessive wear. The gear wobbled badly. I found a like-new set from Miller Tractor's parts yard. The replacement had obviously come from a tractor which had never used its hydraulics. So the PTO pump is really the way to go.

LarrySTN · May 6, 2016

Mike is right, constant load on the 70 gas hydraulic pump WILL trash the pump drive idler gear as it is poorly lubed. I did pressurize one for a friend several years back, to run his fertilizer auger.

JD model 70 hydraulic output

Paul Hearsey

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Mike M

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Joe Way

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buickanddeere

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coonie minnie

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Paul Hearsey

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Mike M

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Paul Hearsey

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LarrySTN

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