got a j d 850 question

ericlb · Jul 17, 2015

i bought the 850 john deere i posted about a week or so ago, it pretty much works as it should, but has been run hard and put up wet, some cosmetic damage which isnt a big deal, some day i may fix that, several minor hydraulic leaks, most on the loader cylinders, but one curious thing is it seems to take a lot of rpm to run the loader and backhoe, by a lot i mean mid range on the tach, is this normal? it has a adjustment under the seat which im assuming is hydraulic flow, i have it wide open now, most of these little tractors ive run [ kubota, and ih 284] seem to have very quick hydraulics, im ordering manuals for this one, but need to use the tractor now, any advice or help, or is this normal operation for the tractor, hour meter shoes 24oo hours so it shouldn't be worn out

rbhuntn · Jul 17, 2015

(quoted from post at 06:19:53 07/17/15) i bought the 850 john deere i posted about a week or so ago, it pretty much works as it should, but has been run hard and put up wet, some cosmetic damage which isnt a big deal, some day i may fix that, several minor hydraulic leaks, most on the loader cylinders, but one curious thing is it seems to take a lot of rpm to run the loader and backhoe, by a lot i mean mid range on the tach, is this normal? it has a adjustment under the seat which im assuming is hydraulic flow, i have it wide open now, most of these little tractors ive run [ kubota, and ih 284] seem to have very quick hydraulics, im ordering manuals for this one, but need to use the tractor now, any advice or help, or is this normal operation for the tractor, hour meter shoes 24oo hours so it shouldn't be worn out

I have been using a friends Ford 2110 with FEL a lot the last couple of years and his 2014 Kubota with FEL some lately. Both want the RPMS up about 1800 to 2100 for the loaders and work with any speed. Have noticed this on other tractors too.

At lower RPM's they will work but very fast or lift a lot.

Also depends on what you mean by mid-range RPMS.

Sounds pretty normal to me.

Blackhole49 · Jul 17, 2015

normal

Mike M · Jul 17, 2015

Changing the hyd. filter if equipped and/or cleaning the sump suction screen would be a good idea. Changing the oil may help too if it had something thinner in it than it is to have. Could make it worse though if someone put thicker in it to compensate for wear.

JD Seller · Jul 17, 2015

eroclb: PLEASE get a manual before you operate this very much!!!! The knob your twisting on under the seat HAS NOTHING to do with the hydraulic pressure. It is the rate of drop valve for the three point lift. IF you have tightened it in then you may have damaged the valve. If you have it wide open then nothing is damaged but it sure will let things on the three point drop fast!! LOL This knob is to allow you to safely lower things on the three point that weight different amounts. The lighter the implement the more you can open it. For heavy stuff you will need it turned in most of the way.

I am assuming the knob your twisting is #15A or 15B.

Now you have always had to have a JD utility tractor revved up for the loader or backhoe to work with much speed. They have a small displacement hydraulic pump. They are rated at 2100 PSI and 5 gallon per minute flow. Most farm tractors are double to triple that and my JD 410G backhoe is around 40 GPM. Compact utility tractor hydraulics are slower than larger tractors. Just the way it is.
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Mark - IN. · Jul 17, 2015

The hydraulics on the Deere 850, 950, and 1050 (Yanmar) require that you turn the steering wheel to the right to get the pump to work properly. Left will work, but right (fully) works the best. You'll find it in the owners manual. Also, as someone else said, change the hydraulic filter which is located below the left floor board.

That's where I would start.

Good luck.

Mark

got a j d 850 question

ericlb

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rbhuntn

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Blackhole49

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Mike M

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JD Seller

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Mark - IN.

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