What if .......

[ponytug]

Well, I don't know if it helps, but I did fab up a PTO splined motor to fit a wood chipper designed to run on a 3-point PTO drive. It is pretty straightforward to do, just use a hydraulic motor calculator to work out what would be 540rpm near your max gpm, and make sure that the motor can take the pressure of your PT hydraulics. Do double check that the net horsepower is what you need.

You could certainly make a QA plate with a hydraulic PTO motor on it with a 3-point mount to be able to run many different powered 3-point hitch implements. One thing to consider is how much weight you are adding, second, how far out the implement is going to end up (I am thinking about center of gravity, turning, and maneuvering) by the time you have your FEL, the QA plate, and the three point system.

For me, a one off, with no 3-point hitch and a PTO motor permanently just to the wood chipper made good sense for me, as I knew that I wasn't going to need to power a bunch of three point attachments, and I could put the QA plate near the center of gravity for the chipper, and bring the chipper center of mass close to the PT. A real 3-point hitch would have put the weight of the chipper about four feet out from the QA plate, which wasn't going to work for me.

YMMV, of course.

All the best,

Peter

 

[Tchamp]

I've converted several tractor implements to hydraulic power. Mostly for the 1850. However, 3.4ci displacement in a motor will yield 540rpm at 8gpm flow. I feel like the losses to inefficiency gobble up too much power on the 25hp engine.

One exception I plan to convert this winter is a 3pt string trimmer for fences.

I do have a 3pt hitch added to my 425. Handy.

Keep in mind that you can get a solid 16-19hp compact tractor made to work tractor implements at the rear for 3k or less . My little Mitsubishi is great.

Heat is definitely the enemy. So your cooler thought is spot on.

If the 2422 is the one setup for the backhoe, be aware that the wheel motors are a limiting factor for things like mowing and travel intensive tasks. Ask Terry.

I was hoping for 6-700 in building a three point rig and hydraulic motor configuration and not have to buy another tractor. I acquired the implements with some other equipment and a dead ya mar tractor, which the block is bad in

 

[agjones]

I hear you...but I think you'll be disappointed w implements like a tiller or brush mower. I'm not trying to be a downer in your idea.

Ask and if I can help you, I will.

I use this calculator:
Hydraulic Calculations | Fluid Power | Advanced Fluid Systems

 

[agjones]

I see in your profile that you are OTR. if you are this way, you are welcome to stop by and see 3pt on my 425.

 

[Tchamp]

I see in your profile that you are OTR. if you are this way, you are welcome to stop by and see 3pt on my 425.

Do you have pics?
Where is Jess up mill? Tried to google it but didn’t come up.

 

[Gravy]

If I recall correctly, your 2422 was designed around running a backhoe rather than sustained heavy loads like brush hogging. I don't believe the oil cooler and and fan will be adequate for those circumstances, especially with a more powerful replacement engine adding extra heat to the equation. I would definitely consult with Terry before going any farther.

 

[MossRoad]

Someone correct me if I'm wrong.

As I recall on my PT425, the MAIN PTO PUMP is always running, as it's attached directly to the output shaft of the engine. The AUX PTO PUMP is piggybacked off the MAIN PTO PUMP, so it is always running as well.

I'm fairly certain the PT2422 is set up the same way.

It doesn't really matter if you're running an implement or not, the pump is always running and circulating fluid, and building up heat.

As I recall, the hydraulic cooler on my PT425 is plumbed into the return from the VARIABLE VOLUME PUMP or TRAM PUMP as some of us call it. I'm guessing that's because driving it around generates considerably more heat than the PTO pumps.

So yes, I'd definitely ask Terry at PowerTrac if you can run things like brush cutters, mowers, grinders, etc... on the PT422 if it doesn't have a cooler.

 

[ponytug]

I would be intrigued if there was a hydraulic cooler in the variable volume/ tram pump circuit. It would be under high pressure at least some of the time. The alternating high/low pressure seems to be...prone to failure, but what do I know?

Now, I am really curious.

I believe that on the 1445, the oil cooler is plumbed downstream of the PTO attachments. When not running attachments, the output of the PTO pump dumps straight back into the tank, so no cooling.

All the best,

Peter

 

[Tchamp]

I would be intrigued if there was a hydraulic cooler in the variable volume/ tram pump circuit. It would be under high pressure at least some of the time. The alternating high/low pressure seems to be...prone to failure, but what do I know?

Now, I am really curious.

I believe that on the 1445, the oil cooler is plumbed downstream of the PTO attachments. When not running attachments, the output of the PTO pump dumps straight back into the tank, so no cooling.

All the best,

Peter

I was just going to add additional cooling to the same hydraulic circuit in series with the original cooler to help drop temp of oil, I noticed the tank seems hotter than the oil cooler on the inlet and outlet, so I’m guessing that the tank has other returns that don’t get the benefit of the original cooler. I may even put the other cooler on on of the other returns to the tank, just plumb it in from the return going to the tank reservoir to the cooler then back into the tank reservoir.

 

[MossRoad]

I would be intrigued if there was a hydraulic cooler in the variable volume/ tram pump circuit. It would be under high pressure at least some of the time. The alternating high/low pressure seems to be...prone to failure, but what do I know?

Now, I am really curious.

I believe that on the 1445, the oil cooler is plumbed downstream of the PTO attachments. When not running attachments, the output of the PTO pump dumps straight back into the tank, so no cooling.

All the best,

Peter

Again, from what I've gathered over the years, and someone please correct me if I'm mistaken, because I want to understand my machine better...

The tram circuit is a closed loop that pushes fluid back and forth through the wheel motors depending on the direction of the swash plate as selected by the treadle. The only fluid it draws from the reservoir is the makeup for the internal charge pump, then it pushes that fluid back to the tank. I thought it was that line that had the oil cooler. I'll check my schematics when I get a chance.