Options instead of PRINCE PTO pump

  
  • Thread Starter
#11  
OP
dourobob

dourobob

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Thank Aarons - that worked

A 20 GPM pump @ 2200 psi. needs 30 HP to run it at max. Theoretically, you would need a 20 gal tank for the pump at min.

Now J_J - again it is my serious lack of hydraulic knowledge that prompts the next questions.

If I have the pump as shown in the link above and a 20 to 25 gal reservoir
1 - how to I get 2000 rpm to the pump in order to get 2200 PSI? (on the Prince or Chiet PTO pumps they fit on the PTO and operate at 540 RPM)
2 - am I right that this pressure then has to be used to power a motor that will generate 25 to 30 HP in order to make my snow blower work

I really appreciate the patience of the experts in helping those of us who don't know.

Bob
 
   #12  

J_J

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You connect the pump and clutch up to your fan belts, if this is the pump you want. You could also connect up a pulley set up to run off the PTO. Use a 4 to 1 ratio. 540 rpm will turn he small pulley at 2160 rpm . Make sure the pump is turning in the right direction.

Mechanical efficiency from engine to pump is about 95 %, and pump to motor efficiency is about 85 %. So if the pump takes about 25 HP to run t, then the motor will develop about 21.25 HP.
 
   #13  

kenstrac

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First it would help if we knew what model tractor you have,the pump that was mentioned above to work would need a 21" pulley to drive it. Taking that into consideration plus the size of the pump you will need a considerable amount of room in the PTO area, I still think coming off the front of the engine crankshaft is a better alternative.
 
   #14  

JoelD

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Here was my set up.

The pump was 5-6 GPM, at around 1000 rpm.

Don't forget rpm, you'll be spinning at 540 or 1000 not sure your pto speed on your tractor, my kubota had three, 540, 1000 and 1500.

The last time I looked at surplus something like this was under $100.

Your problem is definately going to be the speed at which you can spin the pump, I'm sure that is probably one of the keys to a PTO pump, the much have gearing inside that spins the pump up to somewhere around 2000 rpm.

I only needed 3-5 GPM so I ran a 10 GPM pump at half it's rated speed.

As far as pressure that is regulated by the bypass valve in your valve body.
As long as you've got the HP to generate the pressure.

You'd need to go up from there.

Joel
 

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   #15  

J_J

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dourobob,

How many PTO speeds do you have? if you have only have 540, you could use an 8 cu in pump to provide the 20 GPM's. If you had higher PTO rpm's, the pump displacement would be smaller. With a direct hook up to the PTO shaft, the pump will have to turn counter clockwise.

Gear ratio are just that, 4 to 1 could be any number of pulley sizes. 3 in on pump would require a 12 in pulley on PTO shaft, etc.

first option---driving a pump off the fan belts
second option----large pump driven directly off the PTO shaft, or pulleys.
third-------------a prince PTO pump matched to your PTO rpm.

Need tank, hoses, and a motor spool valve for variable control.

You might be able to connect the pump directly to the hyd motor, and when you activate the PTO, the pump and hyd motor start turning. You can regulate the hyd motor speed by the rpm on your tractor.
 

Orebonder

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Hi Folks

I have been reading voraciously over the past few weeks and recently came across a post where a person used a hydraulic pump on the PTO of their tractor that they claimed was much less expensive than a comparable Prince PTO Hydraulic Pump.

In my project I am wanting to convert a rear PTO snowblower to a FEL mounted blower and I have had some great advice for many folks here in this thread Front-End Loader - How do I make a 3PH Blower work on a FEL.

It seems I need a pump with 20+GPM at 540 RPM with 2200 PSI

The advice in the discussion noted above also included the following suggestion for an appropriate pump, motor and tank combination:
______________________
Here's a pump and motor combo that is in the right neighborhood for your tractor PTO HP (35).

PTO pump https://www.surpluscenter.com/item.a...name=hydraulic

PTO spline shaft motor (allows you to use standard PTO drive shaft). https://www.surpluscenter.com/item.a...name=hydraulic

Recommended reservoir size is 1 gal per 1 gpm. Running at around 21 gpm this 25 gal reservoir might be a good choice.
https://www.surpluscenter.com/item.a...name=hydraulic

Total cost so far for pump, motor and tank is $965. You'll need hoses and fittings and steel to fabricate brackets to hook it all up. You're probably looking at something around $1200 to $1500.
______________________________________________

My challenge is to find a hydraulic pump and motor combination that will work just as well for less money.

Any ideas, suggestions, recommendations.

Thanks
Bob
Hello...I just converted a rear mounted PTO operated snowblower to a FEL mounted, hydraulic operated unit. Where would be the best section here, to post it in.
 

agjones

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Orebonder

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Hello... I just completed converting my rear mounted, PTO driven snow blower to a FEL mounted, with skid steer, quick attach plate, Hydraulic Driven unit....and it works great...so far as my testing indicates .

i tached everything at different RPMS to make sure that the snowblower is performing just as it did when mounted on the rear, using the PTO shaft.

I wanted to make my own tank because I don’t like the look of the big square tanks hanging off the Back....and just because I needed a fabrication project!... lol

I used the tractor existing hydraulics to operate the chute rotation and angle deflector .....just had to add longer hoses.
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