Tapping into existing hydraulic pump to run a PTO motor

[r8f1k]

I have a Mahindra 4510 that has 9.6GPM from the pump and 4.3GPM for the power steering. I was wondering if I could tap into the pressure line that feeds the 3 rear remotes, add a 'T' fitting and a hydraulic solenoid that I can turn on and off to power a front mount PTO motor.

1) Do I have enough flow to do this?
2) What size PTO motor should I get to run a 7ft finish mower?
3) What type/size solenoid should I buy?
4) If this isn't the thing to do, could I add a pump that is driven right off the crank? (18 spline, 1" output shaft on end of crank)

 

[Rich B1]

Start with how much horsepower the mower requires and work backwards. My gut feeling says no.

Your idea of a solenoid means you divert all flow, none of your other hydraulic functions will work. You also need to be very certain there is a relief valve between the pump and solenoid. You must have relief protection when switching.

For what you want to do, a rear driven pump off the PTO is likely more practical, but will require some work to have a decent system

 

[CADplans]

Your tractor hydraulics function just like a garden hose,,
put a "T" at the end of a garden hose,,put a nozzle on one opening,,

the nozzle has no pressure, all the water will go out the other port,
the fluid takes the path of least resistance.

If you put a "T" in the tractor hydraulics,, what you will find is both sides of the "T" will not work,
unless BOTH sides of the "T" are doing work at the same time..

Basically, do not add a "T" to a hydraulic pressure supply line,,,

 

[ericm979]

You can't tee into a pressure line on an open center system. It's valves are serial, not parallel. You're not going to have enough flow to run a 7' mower. The crank nose is not made to run something that takes that much power, and you'd have to construct another PTO clutch. You should use a PTO driven 3pt mounted hydraulic power pack. Many companies make them, or you can build one.

 

[jaydee325]

This TBN thread pretty much indicates you don't have enough hydraulic flow to run a 7' finish mower with a hydraulic motor.

https://www.tractorbynet.com/forums/hydraulics/191194-hydro-power-finishing-mower.html

 

[r8f1k]

Kinda figured that was not going to work, but I thought I would ask.

OK, so my options, at least to me, are as follows:

1) The best option is to get a PTO gearbox driven off of the crank like the ones made by Zuidberg. They are however VERY expensive. Anyone know of a universal version of Zuidberg's PTO gearboxes?
2) Add a hydraulic pump to the engine, belt driven with an electric clutch that will feed the PTO motor independently.
3) Use a PTO gearbox that runs a shaft all the way to the front from the back.

The problem that I also have, is that I want to be able to have the rear PTO and lift arms available to run an airblast sprayer for my orchard. The mower that is on the front is a swing arm mower that has a disc that 'swings' out of the way when it encounters a tree. Having that in front of the operator is FAR superior to having to look behind you or use a mirror. Smaller trees are more sensitive and I would like to be able to adjust on the fly accordingly

 

[ruffdog]

Don't forget the issue of HEAT and how you plan to cool that oil.

 

[r8f1k]

Any recommendations for accomplishing this?

 

[ruffdog]

Any recommendations for accomplishing this?

Depending on your demands, a knowledgeable person may recommend a cooler in the system.

Mobile Hydraulic Oil Cooler DC12V-12 w/ 12V Fan & Shroud Replaces Cool-Line D1 / D16

 

[r8f1k]

Does anyone know of a PTO gearbox that is crank driven with a clutch?

 

[CADplans]

Any recommendations for accomplishing this?

Why would you want a mower on the front of a tractor,, ??
with it up there,, both you and the tractor will be breathing LOTS of dust,,

You will see some serious engine overheating.
Go look at what they do to a combine to keep the engine at a reasonable temp,, with all that dust.

Recommendations? I recommend this,,,

 

[r8f1k]

I want it up front to negotiate around trees in my orchard. My mower has a special swing arm that 'bumps' the trees and swings out of the way. This gets between the trees and really close to the trunks to prevent weeds and grass. I am not a fan of Roundup which is much easier solution.

 

[CADplans]

Yea, up front is nice,, especially when the manufacturer did all the leg work,,

This is my weedeater,,

 

[ericm979]

How much power does the sprayer need? If it needs much power, you may not have enough to run it and the mower and drive the tractor.

If it does not need much power, you could convert it to hydraulic using a motor that will spin at 540 rpm at the flow your system produces. Then run the sprayer off your tractor's hydraulics. 9 gpm @ 2100 psi is ~11 hp. Then you can run a PTO shaft from the rear to the front to run the mower, or use the PTO to run a pump and use that to run the mower.

 

[r8f1k]

The sprayer and the mower will never be run at the same time.

 

[ericm979]

Then why go to all the trouble to make the mower not run off the existing PTO?

 

[r8f1k]

I want the mower in the front, not the rear. I have no front PTO

 

[shovelmike]

Yea, up front is nice,, especially when the manufacturer did all the leg work,,

This is my weedeater,,

NICE weedeater, that's the way to do it.

 

[ericm979]

I want the mower in the front, not the rear. I have no front PTO

I understand that. But you rejected the idea of a 3pt mounted hydraulic power pack to drive the mower because the sprayer is on the back. Yet you say you won't use the mower and the sprayer at the same time. Something's missing here.

 

[r8f1k]

I understand that. But you rejected the idea of a 3pt mounted hydraulic power pack to drive the mower because the sprayer is on the back. Yet you say you won't use the mower and the sprayer at the same time. Something's missing here.

Must have missed that, what is a power pack?