'48 JD A Powertrol AA5724 valves

Shop I'm trying to buy the parts from say there are 2 different styles & confusion.

What I want to do is plumb the quik tach's out the side of the powertrol & simply rotate the 5724 valves to switch between the 3 point & hog lift.

Any help would be appreciated!!

Barry:

You might have a problem that I'm not sure how to solve. Around '48 or '49, maybe a bit later, Deere switched the design of the Powr-Trol box from the type that used a knurled ring to retain the hoses and plugs, to the style used on the later tractors like the very late "A"s and "B"'s and then the numbered series. In the photo you will see a color photo of a '70 Diesel Powr-Trol unit, which has a AA5724R selector valve in the upper hole. In the lower B&W illustration you will see the parts I speak of referencing a '48 era "A". We had a '48 (S/N 595751) and it had the knurled rings. Those contain a shear washer (see the c-clip?) and are different from the later style unit in the way they retain the plug, so yes, there are two different types.

As far as I know, the AA5724R will only fit in the later, lever type Powr-Trol box. The "A" parts book shows the AA5724R, but says it is for power trol units of PCV-67905 and later. That sounds pretty late in the run to me.

Unless you want to swap and install a later unit from a 50/60/70 or even a later yet "A" or "B", you might be able to install and use a AA5724R.

Frank

Looks like I have the old style. Does the C-clip style plug have the ability to operate either rockshaft or quik plugs (if I stick the quiks out the side)without disassembly?

The old plugs should be around here somewhere but I have not run across them yet.

Another question does the newer (# style bolt in compatible) powertrol have higher pressures and or oil capacity?

I have a dump wagon (single action cylinder)that when loaded the powertrol falls short of a full lift to dump contents usually wet clay, pushing the box up by hand gets it all the way up to dump.

Thanks

>>>Does the C-clip style plug have the ability to operate either rockshaft or quik plugs (if I stick the quiks out the side)without disassembly?

It should, but there will be a minor catch. If you install the open end plugs and you cycle the lift up, the hitch will raise, then the cylinder will raise. If you chain or otherwise block the hitch in the upward position, then the cylinder will continue to work without any hitch action.

>>>The old plugs should be around here somewhere but I have not run across them yet.

You'll need those to make it work correctly.

>>>Another question does the newer (# style bolt in compatible) powertrol have higher pressures and or oil capacity?

I thik the pressure relief valve was shimmed for matbe a 100 psi more, not much. You can add shims to increase the pressure of your unit, and a few might help your lifting problem, but if you go too far, you could blow a gasket or seal.

Frank

I'll get the c clip style & use as is.

I've seen the plugs go at auction for $50 pair. I know there is a set around here somewhere but they have 30 years of accumulation on top of them!

Here's a couple of examples:

Link

Link

Frank

4 th try