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John Deere Tractors Discussion Forum
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Hydraulic Pressure

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Joel Sanderson

09-19-2019 08:12:51




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Anyone know how much pressure the number series has in its hydraulics? (60, 70, 80, 620, 720, etc.) I'll be putting an hydraulic pump on my D, under the mag, and I'm wondering how its pressure will compare to other tractors. I don't suppose it'd be the same basic pump, now would it? I should take a picture of it, but I've gotta go turn some hay. I can tonight if it'd help.

Is there any reason I can't use modern hydraulic oil (whatever that is) with it? My '44 A says 30 w oil, but I want the D to be compatible with the farm's implements that're run by the other tractors.

joel

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John Deere D

09-19-2019 21:31:49




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 Re: Hydraulic Pressure in reply to Joel Sanderson, 09-19-2019 08:12:51  
Joel......
I ran a John Deere "D" styled with extensions on steel to pull a model "Krause 10' and later a Model Alteen" disc....10' (used at old machinery days later 1970's).....they are heavy. Our JD 730 Diesel pulled it with a 10'section of 160 railroad iron...160 lbs /yard...dragging behind as a leveler.

My JD "R" pulled the same disc in 2 nd gear... the smoke rolled from the exhaust pipe (in the high 30's F at night) fire was evident from the stack, with no railroad iron behind it.

The hydraulics ...given they were probably on the low end of their factory maximum out put,(PSI) required the use of a 4" diameter ram when using the JD "D" ...I NEVER did check the Pump PSI:

The 3" diam Ram was not large enough, given the pump out put (psi) when using the JD "D"

Today my Case 830 with hydraulics <2000 psi require the usage of the 4" diam. Ram (on the above disc) once the oil is up to operating Temperature:

Keep it simple:


Force= Psi X Piston / Area

Psi @ 650 .....Ram Diam @ 4".........(2X2) X 3.142= 12.568 X 650 psi =8169.2 / 2000 = 4+ Tons...does your disc weigh 4 Tons??

Psi @ 650......Ram Diam @ 3".........(1.5 X 1.5) X 3.142 = 7.069 X 650 psi = 4595.1 / 2000 = 2.29 Tons...does you disc weigh 2 1/4 Tons???

Psi@ 600......Ram Diam @ 4"........(2X2) X 3.142 = 12.568 x 600 psi =7540.8 / 2000 = 3.77 Tons...does your disc weigh 3 7/4 Tons ?????

Hope the Math is correct...it's late out here in Alberta.....


Bob.....

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Joel Sanderson

09-21-2019 04:01:51




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 Re: Hydraulic Pressure in reply to John Deere D, 09-19-2019 21:31:49  
That's really helpful, Bob. Thank you very much. I'll check the seeder's book to see what it weighs and what size ram the D'll need.

It sounds like the D pulled the disc that the R blew smoke and fire out its top to pull. Did I read that right? Are you saying they're about the same drawbar horsepower? I've never been around an R, but my grandfather's best friend had one, and I've heard a lot of stories about how tough it was--back when it was the biggest tractor in the area. It was the inspiration for my dad to get his 80.

I sure like your picture of the pressure gauge. I need to get one of those.

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KJohnson92

09-19-2019 18:29:34




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 Re: Hydraulic Pressure in reply to Joel Sanderson, 09-19-2019 08:12:51  
You can use hygard either way, most everyone does even in original pumps. Works great and flows better in the cold. Plus the whole not mixing ND oil into your other stuff thing is wise I think.



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buickanddeere

09-19-2019 14:12:48




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 Re: Hydraulic Pressure in reply to Joel Sanderson, 09-19-2019 08:12:51  
If it won't lift, use a hydraulic cylinder of larger diameter.



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Pete in MD

09-19-2019 08:23:54




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 Re: Hydraulic Pressure in reply to Joel Sanderson, 09-19-2019 08:12:51  
With the pump you're going to use behind the mag, the working pressure will be around 610 PSI and max relief pressure will be 750-790 PSI.
Yes you can use HyGard or other modern hyd. oil.



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Mike M

09-19-2019 08:19:53




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 Re: Hydraulic Pressure in reply to Joel Sanderson, 09-19-2019 08:12:51  
Those old ones don't have very much pressure. I'd have to look in the books for sure so I'm just guessing now. The A,D ? 1000psi. The 50,60,80 might be like 1200 psi ? and then the later 620,720 were higher around 1500 psi ? What are you planning to run with the D ? I know many guys can't even run new style hay rakes anymore with old tractors.



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Joel Sanderson

09-19-2019 11:15:27




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 Re: Hydraulic Pressure in reply to Mike M, 09-19-2019 08:19:53  
I'll be lifting an 8 foot disc and a plow, but I also hope that it'll be able to lift the ten foot Brillion seeder we plant hay with. It's got two packer rolls but two cylinders. We generally use the 80, but it doesn't make the corners well, especially when we plant back and forth. I also think it's too heavy, even with duals, because a field I planted last year looked nice and smooth after I'd fitted it, but after I seeded it--which I had to go over twice in order to plant the timothy--it had wheel tracks. I think the D will be about right, with duals--if it can lift the seeder.

Personally, I don't much like that seeder. It only has one seed box, no fertilizer, and the metering is ridiculously crude and inaccurate. My little 9 hole, horse drawn Superior drill does a much better job, but it's too small for anything but tiny fields. But that's rather off topic.

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Mike M

09-19-2019 11:44:59




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 Re: Hydraulic Pressure in reply to Joel Sanderson, 09-19-2019 11:15:27  
Might be better off with the 620 ?



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Joel Sanderson

09-19-2019 18:26:39




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 Re: Hydraulic Pressure in reply to Mike M, 09-19-2019 11:44:59  
Oh probably. But I think the D'll ride better but have only half as many jobs it can do. Some day I'll have a 620. That's just not today. :)



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Mike M

09-20-2019 04:57:48




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 Re: Hydraulic Pressure in reply to Joel Sanderson, 09-19-2019 18:26:39  
Oh, I thought you had one of each of the listed tractors ?



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Joel Sanderson

09-20-2019 16:15:11




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 Re: Hydraulic Pressure in reply to Mike M, 09-20-2019 04:57:48  
You're teasing, I'm thinkin. :) Between my dad and myself, our two-bangers are an 80, 730, A and now this D (which makes him grumble).



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