790 hydraulic pressure boosted: John Deere Review  -- John Deere Tractors Discussion Forum and Review 790 hydraulic pressure boosted: John Deere Review -- John Deere Tractors Discussion Forum

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 04-05-2004, 18:27 Post: 82229
glalonde



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 790 hydraulic pressure boosted

A few months ago, there was some discussions about boosting the lifting capacity of the 790 (loader and 3pth) by about 20%, by adding shims to the main relief valve (from 2045 psi (default) to ~2400/2500 psi).
To those who did the modification, did you have any problems since then (i.e. defective pump, hose/couplers leaking, etc.) ?
I'm planning to do the same mod. but would like to hear your feedback first.
Thanks






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 04-06-2004, 04:34 Post: 82277
mainiak1



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 790 hydraulic pressure boosted


I haven't used my tractor much this winter but, no problems yet. I would do it again in a heart beat.

mainiak1






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 05-27-2004, 15:38 Post: 87034
jusbauer37



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 790 hydraulic pressure boosted

I just got my new 790 today, was wondering where i could get more info. on shiming the hydraulic pump?






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 05-28-2004, 17:13 Post: 87116
mainiak1



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 790 hydraulic pressure boosted

Under the seat the shims are under the largest cap. Take it off slowly there is a spring under the cap. You get the shims from the dealer. They come in varying sizes I put the pack in and pressure tested at 2500psi. Part number
AM875169 I personally would not go any higher than that.






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 05-28-2004, 19:48 Post: 87128
F350Lawman



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 790 hydraulic pressure boosted

No problems at all, after about 50hours on the modification. Lifted boulders, loads of wet muck, trees, heavy implements, front end of my manure cart, all without a problem.

The tractor works they way it should have to start. Now... if you don't use a counterweight, the added lift capacity could make it easier to tip, but I'll bet your smart enough to know that. It's a light tractor so keeping the pressure down and the lift at around 700lbs. made it more "idiot proof". With the modification it now lifts the front end of the tractor without having to curl the bucket and lift capacity must be nearer 1000lbs. The downside is for those dummies that no ammount of precautions will help. If the extra lift didn't get them something else would anyway Smile

I'll bet if we did research we could find applications were that same pump is used at 2500psi anyway. The factory hoses are rated at 3000psi and the relief valve still trips before anything breaks, so I don't think we're hurting anything.






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 05-28-2004, 21:14 Post: 87136
glalonde



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 790 hydraulic pressure boosted

F350Lawman

Did you use one pack of shims or did you use a pressure gauge to 'fine-tune' the pressure ?

Since I do not have a gauge and the proper couplers to do the connection, is one pack of shims safe (i.e. near 2500 psi) ?

Presently, the tractor will carry a full bucket (mushroom compost, mulch, clay, gravel ...) but has a bit of difficulty to get the material into the bucket when scooping from the bottom of a pile.






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 05-28-2004, 21:37 Post: 87137
F350Lawman



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 790 hydraulic pressure boosted

I just added a pack based on others experience, no reading taken. Others have gotten 2500psi with the same method. I did get betetr performance but if you scoop from the extreme bottom of a huge pile I imagine you can max out any loader. I have learned that and improved my technique.






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 05-29-2004, 21:59 Post: 87214
Chief



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 790 hydraulic pressure boosted

Hi Scott, if you haven't already; I would suggest putting a guage on the system just to verify the actual pressure being generated just for peace of mind and to be sure you know where you are operating at.






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 05-29-2004, 22:17 Post: 87219
F350Lawman



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 790 hydraulic pressure boosted

That would be a good idea Chief. All I know is several otheers have gotten right about 2400-2500 with one pack of shims. based on their ereadings, my % of increase in performance and the fact that the relief valve blows before my 3000psi hoses, and without killing the motor at idle, I am fairly confident I am OK.

Of course a real reading would be preferable, maybe next time I am at the store and see a guage I'll pick one up. They are pretty $cheap$ anyway.

P.S. I have used the FEL extensively and pretty hard since the modification so my human guinea pig test has probably proven it safe anyway Smile






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 05-29-2004, 22:25 Post: 87224
Chief



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 790 hydraulic pressure boosted

My guess would be that you are most likely in the ball park pressure you were after but the test pilot in me wants to know the pressure I suppose. ;o) I am a firm believer in what Ronald Reagan once said about the then Soviet Union and the missle disarmament treaty. "Trust but verify".






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