3020 standard

ripbob · Mar 17, 2009

Looking at a 1964 3020 std that lifts the 148 loader very slowly. No chatter, no jumping, just slow and steady. Hydraulics plumbed power beyond to mid mount with a joy stick. I can pressure check, what is specs for pressure. Or is it gpm flow problem? How big is the pump? Owner saids it lifts well, just slow. Has been that way ever since he has owned it. (couple years)

Anonymous-0 · Mar 17, 2009

The pump is fairly large. How fat are the loader lift cylinders? I run a flow restrictor valve on the hydraulic feed to my early 4020 with a MF-236 loader to keep it controllable.

Is there a flow restriction like a valve or a disk with a small hole in a pressure fitting feeding the loader valve?

Its a flow problem, a pressure problem shows up if it won't lift a heavy load. I think the pump is something more than 15 gpm and that should be enough to flip the loader too fast.

One thing about it being slow, its easy to keep under control.

Gerald J.

tim s · Mar 18, 2009

You said it was hooked to a "mid-mount" power beyond,some of those tractors had a mid-mount SCV that actualy ran through the SCV operating valve, if this is the case that would slow it down, check to see if one of the SCV's need to be latched to get loader pressure..to make it work as good as it can the pressure should come from the fitting in front of the brake pedals and return through the trans. filter bowel.

Gary Streff · Mar 18, 2009

I had a 3020 from about that year with the same problem. The loader hydraulics had been plumbed into the tractor at the wrong point. They pulled pressure from the line coming from the pump up under the hood and put the return line into the xmission the wrong point. Can't remember exactly where. This setup cracked a pressure plate somewhere in the xmission deep under the seat area. Very expensive and take apart to fix and not easy to find.
Tim S.. do you have pictures by any chance of where you are talking about to plumb in. I have been looking for that info. [email protected].
Thanks

Tx Jim · Mar 18, 2009

ripbob,
Factory stand-by psi is 2250 but one can set it to 2400 psi with no ill effects. This can speed up loader operation.

44 Diesel Tech · Mar 18, 2009

You could try setting steering pressure control valve (or priority valve as it's called sometimes) a little bit lower. Around 1600 lbs. And the main pump at 2400. This has worked for me in the past. Another thing that could make it work better ( inaddition to above ) is shiming up crankcase valve spring in the main pump a little more. This will also give you quicker responce. You might be able to do this without removing pump. You should be able to see a difference if you do a before and after flow test. Good pump should pump about 20 to 23 gpm depending where you are hooked into with your flow meter.
Howard

Bob · Mar 18, 2009

Before messing with ANYTHING, get a flowrater on it and see what the MAIN PUMP'S output is.

If the main pump has problems, no "band-aid" fix is gonna cut it.

tim s · Mar 18, 2009

A good 3020 'might' do 15 GPM. 10 or so is probably closer,unless the pump has been re-placed,,mid 60's was a long time ago..

ripbob · Mar 18, 2009

Thanks for the info. Have a friend that is a JD tech. Believe I will drag him along after work sometime this week and check flow and pressure. I really believe it has a flow restriction, but we will find out for sure before trying to trade. The old girl is really nice almost original 3020 with a later model 148 loader.

3020 standard

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Gary Streff

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