Shaft speed

[Sawmill]

I need some help. I am going to use my tractor to run a hyd pump. My pto runs at 540 rpms so I am going to use a jackshaft and connect the pump to this shaft using a lovejoy coupler. This shaft will have 2 bearings on it and then using a sprocket and chain connected to a second jack shaft which will be hook by a pto shaft to the tractor. I need to know what size sprockets that I will need to increase the pto speed to 2000 rpms it can be a little over but I don't want to ga any slower. Thanks Ivan

 

[wkpoor]

Did you know there is already a pump designed for PTO? Prince makes them. They come in several GPM ratings and slide right on the PTO shaft. Also Charlyn used to make a pump system combo that did the same. I had one. The only time I've seen that done was for non standard PTOs like on the Farmall Cub.
If your still into the jackshaft idea the drivin pulley will need to be 4xs smaller than the driving one to get 2000rpm at 540. But remember this you may not want to run your engine that fast all the time. I would design it so your engine is just off idle if you have the power. There are hydraulic equations for figuring the power needed to turn a pump with certain flow and pressure specs.

 

[Butch(OH)]

540 to 2000 is basicaly a 1-4 ratio so for every tooth on your pump gear you need four on the PTO gear, 8-32, 10-40, etc At 540 your pump will be running 2160 Like WKpoor suggested mine is geared so I can run the tractor just above idle. The only problem is that if some turk runs the tractor wide open it will trash the pump, I solved that by not loneing out my splitter.

 

[dingeryote]

Sawmill,

I'm kinda cornfused here.

You are running a PTO pump for the splitter Hydro? What's the jack shaft and gearing to 2000 rpm for?

Or.... I am assuming here. You are running a NON PTO pump, and want to power it from the PTO?
If that is the case, for the cost of the jack shaft, gearing, chain,PTO Shaft and headaches, you can buy a proper sized PTO pump and Hydro lines.

LOL!!!
I have this rube Goldfbergian image going!!

Dingeryote

 

[Sawmill]

I have everything that I need to make it the way that I described. I cannot see going out and spending 400 to 500 hundred dollars on something that I already have on hand and can make work. I realize the PTO pump would be easier I want to use what I have on hand.

 

[wkpoor]

I know a guy who has a Farmall Cub made into a backhoe (very functional machine) and did the jackshaft to power his pump. It was done very professional. Only other issue is it totally ties up the tractor. If you use your tractor for other jobs the jackshaft idea will be a tough one to make easily detachable like a PTO pump.

 

[Lloyd H]

pto speed

Something to consider, a 2000 RPM chain drive will be a high maintenance item unless in an enclosed oil bath container. A well designed belt drive would be a lot more trouble free, maybe a flat multi vee serpentine type for a 4 to 1 ratio

 

[John D]

I dont know what it costs,but this may direct bolt to your pump 3.75 ratio is close.Should be trouble free for yrs of use. http://www.bareco.com.au/files/pto2002/pto100.htm

Also if you look up pto gearboxes,they have small ones for 1800RPM generators i think they run a 3.33 to 1 540RPM in 1800RPM out.You hsould be able to find one,I found one a while back for 200 i think.

 

[Khtsr44]

What tractor?

Can you mount your pump to the front end of the engine crankshaft?

 

[jgoodhart]

4 to 1 ratio would get you the correct speed. I would use V-belts instead of roller chain for maintenance issues. You didn't post the hp of your tractor but somthing over 12hp I would gear it to run A fast idle on the tractor.

 

[Butch(OH)]

High maintenance? What do you guys consider high maintenance? If you look closely at this pic right behind my son's hind end and below the hydraulic tank is the 4-1 (approx) chain drive in operation that I built to do the exact same thing almost 35 years ago and today still running the original chain, sprockets and bearings. The entire splitter has been rebuilt twice except the drive and pump never touched. I think the chain is a #60, can find out if need be. Sorry for bad pic, wasnt supposed to be a pic of the drive, LOL

<IMG SRC=http://i29.tinypic.com/31619uf.jpg>

 

[Sawmill]

What I have is a 37 HP diesal tractor that is real easy on fuel that I am going to use. I am going to take the PTO shaft off my brush hog and use it to run the pump when I cut wood. It has the same splines on both ends so it can be changed around easy. I am building a wood processor that has a Stanley Hydraulic saw on it and I have a table with a feed chain to move the logs forward. I have to build the splitter yet but it will have 4 X 24 inch stroke with a 2 inch cyl dia. The saw has a 24 inch bar with a 3/8 chain on it.I used this processor to cut slab wood off my sawmill and it will bury you in wood and I was using the Hyd off the skidsteer. By using a tractor on it I will keep the skidsteer free to load wood. On the infeed side I have a table that that is 7 foot long so I can stack it full of wood to be cut. At a later time I will add hydraulics to it so I don't have to roll the logs down by hand. I have a 20 gal per min pump that I am going to use to run this. I am not really looking for speed but just an easier way to cut firewood. I also have a elevator the I have to add a Hyd motor yet also.

 

[Mike Van]

Sawmill, it sounds like Butch has it figured right - Maybe he'll give you the sprocket sizes he used? On thing I'd do, is rather than run the chain sprocket right on the pump, I'd have it on a shaft on pillow blocks and the pump Lovejoy'd to the end of that shaft. Just a thought, as not all pumps take side loads or rollerchain vibrations well.

 

[Sawmill]

Sawmill, it sounds like Butch has it figured right - Maybe he'll give you the sprocket sizes he used? On thing I'd do, is rather than run the chain sprocket right on the pump, I'd have it on a shaft on pillow blocks and the pump Lovejoy'd to the end of that shaft. Just a thought, as not all pumps take side loads or rollerchain vibrations well.

Thats what I have planned on doing. Thanks for the info Ivan