Hydraulic pump with through shaft

[Hugo Habicht]

Hello,

are there hydraulic pumps available where the shaft being driven comes out the other side? Could be female spline as well.

I looked for "hydraulic pump dual shaft" or "hydraulic pump through shaft" but very little came up. Found a few PTO pumps but their speed was too slow. So what are those pumps being called?

Or can it be successful drilling a hole in the rear lid, adding a seal and bringing the shaft through?

Or I thought of buing a dual pump and removing the second pump section assuming there is a seal between the two hydraulic sections.

Kind regards,
Hugo

 

[TheOldHokie]

Hello,

are there hydraulic pumps available where the shaft being driven comes out the other side? Could be female spline as well.

I looked for "hydraulic pump dual shaft" or "hydraulic pump through shaft" but very little came up. Found a few PTO pumps but their speed was too slow. So what are those pumps being called?

Or can it be successful drilling a hole in the rear lid, adding a seal and bringing the shaft through?

Or I thought of buing a dual pump and removing the second pump section assuming there is a seal between the two hydraulic sections.

Kind regards,
Hugo

Unless you are an accomplished machinist I dont think you are have oing to modify a basic gear pump. Whats the application?

Dan

 

[MOOTS]

Hello,

are there hydraulic pumps available where the shaft being driven comes out the other side? Could be female spline as well.

I looked for "hydraulic pump dual shaft" or "hydraulic pump through shaft" but very little came up. Found a few PTO pumps but their speed was too slow. So what are those pumps being called?

Or can it be successful drilling a hole in the rear lid, adding a seal and bringing the shaft through?

Or I thought of buing a dual pump and removing the second pump section assuming there is a seal between the two hydraulic sections.

Kind regards,
Hugo

Some zero turn mowers had a stacked setup on the pumps. Toro we had at work was like that. There was no seal between the pumps, they were sealed independently. Only a short “jumper” hose connecting the two.
Front pump with pulley was male, backside female, second pump; only male.

Found a picture.

 

[Hugo Habicht]

Unless you are an accomplished machinist I dont think you are have oing to modify a basic gear pump.

The seals on the pump shafts look fairly simple. I always thought there would be fairly pressure on it, but the leakage from the gears must be low enough. I would prefer to buy one ready made but would not hesitate to modify one.

Whats the application?

Hydraulic pump for my tractor. It has an auxiliary pump for lifting the deck and three point hitch but flow and more importantly pressure is too low.

I thought of adding a pump at the input shaft of the hydrostatic drive. I could also add it at the front of the engine at the flywheel but the routing of the hydraulic lines would be better if the pump is towards the centre or back of the tractor.

The engine drive shaft is routed through the hydrostatic drive and the auxiliary pump but the rear PTO gearbox is connected to that.

 

[Fedup]

Not to be nosy here, but it seems to me if you mentioned what tractor you have and maybe some photos of what you have now along with your description of what you hope to find you might get better results.

 

[North Idaho Wolfman]

Not to be nosy here, but it seems to me if you mentioned what tractor you have and maybe some photos of what you have now along with your description of what you hope to find you might get better results.

His profile tells you he has a G1900.

 

[North Idaho Wolfman]

The seals on the pump shafts look fairly simple. I always thought there would be fairly pressure on it, but the leakage from the gears must be low enough. I would prefer to buy one ready made but would not hesitate to modify one.



Hydraulic pump for my tractor. It has an auxiliary pump for lifting the deck and three point hitch but flow and more importantly pressure is too low.

I thought of adding a pump at the input shaft of the hydrostatic drive. I could also add it at the front of the engine at the flywheel but the routing of the hydraulic lines would be better if the pump is towards the centre or back of the tractor.

The engine drive shaft is routed through the hydrostatic drive and the auxiliary pump but the rear PTO gearbox is connected to that.

Let's clear up one detail, you technically do not have a hydraulic pump at all, you have and HST and they are using that for the hydraulics.

A Hydraulic pump with in and out will be costly, and honestly a fool's errand to try and put that in line with the HST.
Mounting it would be a real pain in the backside.

I need a better picture of this area right here.
You MIGHT be able to mount a pump there, the Fuel cam has the provision to run a pump.

 

[Hugo Habicht]

Let's clear up one detail, you technically do not have a hydraulic pump at all, you have and HST and they are using that for the hydraulics.

Well, yes, there is a feeder pump for the HST called auxiliary pump which they use for the (limited) hydraulics. And yes, we agree, it is not suitable to run anything else from it.

A Hydraulic pump with in and out will be costly, and honestly a fool's errand to try and put that in line with the HST.
Mounting it would be a real pain in the backside.

Thank you for your advice, I am sure everything you say is correct, as always, and I know that myself. I never said it will be easy.

You MIGHT be able to mount a pump there, the Fuel cam has the provision to run a pump.

Thank you very much for the hint, did not know that and will look into it.

My original question does not aim at how and where to install such a pump but to find a suitable pump the first place. There are plenty generic hydraulic pumps around but I just cannot find one with the shaft going through, apart from PTO pumps which are not suitable.

So how do you call those pumps? What search words do I have to use to find them on the internet?

 

[Tim Horton]

Here is one ..old school.. source of pto (540rpm) pumps.. This source from back in the day when people were fabricating there own wood splitters and such..

It sounds like you are wanting to run a pto shaft through the pump to run something else ...behind... the pump ??

BE SURE to post pictures of your set up when you get it running..

PTO Pumps | Hydraulic Pumps | Hydraulics | www.surpluscenter.com

PTO Pumps,Hydraulic Pumps,Hydraulics, PTO DRIVE HYDRAULIC GEAR PUMP Brand new PRINCE model HC-PTO-2A hydraulic PTO gear pump. Ideal for adding

www.surpluscenter.com

 

[Hugo Habicht]

It sounds like you are wanting to run a pto shaft through the pump to run something else ...behind... the pump ??

Yes, that's right. But PTO pumps are not suitable. I want to place the pump at the drive shaft from the engine to the HST gear box. So it has to be suitable for 3200rpm.

Best potentially suitable pump I came across so far are dual hydraulic pumps. The shaft of the first pump is definitely going though. Concerns are regarding the internal seals, if any. Also I cannot really find the right displacement. I found 16ccm/rev but I would like around 30ccm/rev.

Maybe I made a fundamental mistake in my calculations, but the numbers double checked through hydraulic power match up.

 

[GreensvilleJay]

curious as to what you want to power with the 'pump' ?
A possible location would be the 'fan belt system'. Several guys added a car power steering pump to old tractors to make loader lifts. Today you can buy small hydraulic pumps with lots of flow and pressure, Will need a fair amount of bodging to add tank(2 x GPM ) valving, hoses but an interesting project !

 

[Mikeymotorbikey]

I've got an Eaton brand pump stack on my modified Case 446. The first pump is a variable displacement piston pump used for the tractor drive. The second pump is a gear pump for the hydraulic PTOs front and rear. The third pump is a smaller gear pump that powers the steering, mid and rear implement lifts, and FEL. The first 2 pumps have through drives to power the following pump.

The piston pump is an Eaton model 70144, this has a 2 bolt SAE A flange to drive the first gear pump. This could be used as you propose but it is quite large and I don't think there is a shaft seal at the rear of this pump.

The first gear pump is an Eaton series 26 with a tandem back plate. This allows a 2 bolt SAE AA flange to drive the third pump. This type of pump could be used as you propose by removing the third pump, or finding one without the rear pump and using the drive as a through drive to drive your HST. The limiting factor would be the max allowed torque of 261lb/in [29.5Nm].

Finding one will be the issue as I believe Eaton is no longer in the hydraulics business.

I guess my point would be to look for a tandem gear pump that would allow you to remove the rear pump and use that drive to drive your HST.

But as the Wolfman stated above this will be costly and a pain to mount.

 

[Tim Horton]

Yes, that's right. But PTO pumps are not suitable. I want to place the pump at the drive shaft from the engine to the HST gear box. So it has to be suitable for 3200rpm.

Best potentially suitable pump I came across so far are dual hydraulic pumps. The shaft of the first pump is definitely going though. Concerns are regarding the internal seals, if any. Also I cannot really find the right displacement. I found 16ccm/rev but I would like around 30ccm/rev.

Maybe I made a fundamental mistake in my calculations, but the numbers double checked through hydraulic power match up.

==
A thought..... At one time I was kinda, sorta engineering in my head an 1100rpm capable pump to mount on the belly of my compact tractor to run off the mid mount pto shaft there.. Leaving my rear 540rpm pto open for other uses... Never got it fabricated, so don't know if I would have had enough horse power and all to make it work.. Good luck..