PTO pump stalling tractor .

[Swamp Rooster]

Hello every one . I was talking last week about getting a PTO pump to rum my log loader . I did and I went with this pump 16.6 gpm at 540 rpm . I have it all mounted , made a bracket for it . It seems to want to really work the motor on my Tractor to run the pump . The loader requires 9 to 11 GPM to rund . I was told that I could just idle my motor down and the pump would handle it well . Even at 2000 and 540 it really lugs down..
I was thinking that I was trying to move to much volume of oil ? Thought the pump might be to big .. Any thoughts .. I will try and post some pics .. Tractor is a TC33 Browser no longer supported Browser no longer supported 7.62 cu in 16.6 GPM 54 RPM Dynamic GP-PTO-A-7-6-S Hydraulic PTO Pump | Dynamic | Brands | www.surpluscenter.com

 

[CADplans]

In your case, typically,, 1GPM @ 1,000 PSI = > 1HP

so,, 16.6 GPM @ 2,000 PSI can easily equal > 33+ HP,, you have about 28 PTO HP,, so,, there should be an issue,,

reduce the pressure a little,, until the tractor is "happy",,,

 

[Sawyer Rob]

If you have a hydro TC33, you have just under 27hp at the pto, that pump would be a pretty good load when it's at max pressure...

Keep in mind, when you are moving/working, you have other things on that tractor robbing hp from your engine too, all at the same time...

Also, do you have a flow restriction some place? Like a bottle neck for the hydraulic oil??

SR

 

[Swamp Rooster]

In your case, typically,, 1GPM @ 1,000 PSI = > 1HP

so,, 16.6 GPM @ 2,000 PSI can easily equal > 33+ HP,, you have about 28 PTO HP,, so,, there should be an issue,,

reduce the pressure a little,, until the tractor is "happy",,,

How do I reduce presser ?

 

[Swamp Rooster]

My TC33 is gear driven ..

 

[Industrial Toys]

Do you have relief valves you could back off on? You should not need much hydraulic performance for a log loader. Not like a snow blower with hyd motor.

Actually I just thought about this. It is probably an open center system, so there should be oil flowing through your spool at little pressure with no function selected. When you select a function you will build pressure as your cylinder is operated and go into relief at end of stroke.

 

[Swamp Rooster]

Do you have relief valves you could back off on? You should not need much hydraulic performance for a log loader. Not like a snow blower with hyd motor.

Where would I look for that ? I am not sure .

 

[Industrial Toys]

I edited my post. I guess reliefs are either on the pump or valve spool. But no reason for them to be in relief when nothing is being operated.

 

[Swamp Rooster]

I edited my post. I guess reliefs are either on the pump or valve spool. But no reason for them to be in relief when nothing is being operated.

Could it be right on the pump ?

 

[ptsg]

Looks like you have a combination of various things creating all kinds of problems.

On the other thread, you mentioned it used a Honda engine with a pump to run the log loader. That pump is probably around 5-6 GPM and the whole hydraulic system of the loader was design around this GPM.

Now, you increased the size of the pump for one that over 2,5 times bigger than the stock one. The rest of the system, as in size of lines and GPM that the valve block can handle was not designed for a pump this big. This will create all kinds of problems. Most likely the stock lines are 3/8", that can't definitely handle this much GPM of the new pump, hence causing restriction even just with the system idling.

Even though you can reduce the system pressure, you're going most likely to still have problems with that pump.

The relief valve is usually on the control valve body.