Hydraulic pump to motor quandary - help needed.

[Plain ol Bill]

Hi folks, long time no visit here but need some help -- sooooo. I am trying to hook up a 10 HP elec motor w/ a 1-1/2" shaft to a hydraulic pump w/ a 1/2" shaft using a foot mount for the pump. I am not having any luck finding lovejoy type couplings for this hook up. Both shafts are keyed, Doe's anyone make a shaft enlarger for the 1/2", or reducer for the 1-1/2"??? How do I do this?

[Black Forest]

Hey Bill, I was thinking about you just the other day! Really. Have you made any interesting knives lately? As to your question, is there any reason you couldn't use an Oldham coupler instead of a Lovejoy coupler? You can easily make a Oldham coupler to suit both shaft sizes. How are you mounting the pump to the motor? Or does the pump have it's own mounting separate from the motor?

[Tundra Twin Track]

If no luck with Lovejoy coupling,a chain coupling would easy and lots of variable hub &sprocket sizes available.

[tom_d]

Hi folks, long time no visit here but need some help -- sooooo. I am trying to hook up a 10 HP elec motor w/ a 1-1/2" shaft to a hydraulic pump w/ a 1/2" shaft using a foot mount for the pump. I am not having any luck finding lovejoy type couplings for this hook up. Both shafts are keyed, Doe's anyone make a shaft enlarger for the 1/2", or reducer for the 1-1/2"??? How do I do this?

If no luck with Lovejoy coupling,a chain coupling would easy and lots of variable hub &sprocket sizes available.

Chain coupling will work well. Problem might be in getting ones that overlap with your shaft sizes. That's a big jump going from 1-1/2" down to 1/2". There's a bunch of affordable options using weld together hub-sprocket combinations at places like Surplus Center, but there still might be some light machining required on your part.

[LKeithR]

The question I'm asking is if your pump only has a 1/2" shaft why on earth do you need a 10 HP motor?
I can't imagine a pump with a 1/2" shaft that could use all that power. If you're stuck with that combination
you should be able to find a Browning style flexible coupling that would do the job...

[oxford]

The question I'm asking is if your pump only has a 1/2" shaft why on earth do you need a 10 HP motor?
I can't imagine a pump with a 1/2" shaft that could use all that power....

I was thinking the same thing.

FWIW, It wouldn’t be hard to make up a sleeve for the 1/2” shaft and an OD to work with the Lovejoy. You could even weld it into the Lovejoy if you wanted.

[Doozer]

Maybe just maybe if the 1/2" shaft was splined.
But something is aiming to twist off. Heat treated
hardened steel only gets you so far.....


--Doozer

[Plain ol Bill]

My primary problem is that all of my machining stuff has gone to live somewhere else anymore. Keep the ideas coming folks - I need all the help I can get with this old brain anymore.

[wierdscience]

Are you sure the motor shaft is 1-1/2? More common would be 1-3/8" which if it is a Lovejoy L-100 would join the two.

[welderskelter]

My 14 hp. kohler only has a 1-1/8 shaft and northern hydraulics had both lovejoys.

[Bented]

Many types of drive couplings may be purchased with small unfinished bores, bore and key to size.

[oxford]

My primary problem is that all of my machining stuff has gone to live somewhere else anymore. Keep the ideas coming folks - I need all the help I can get with this old brain anymore.

They aren’t very cheap but McMaster has step up and step down shaft adapters listed. The ones they have will make you have a little extra distance between the pump and motor though.

Part numbers 3256K21 and 9783T17

[3illmesmart]

Easy, bore to motor shaft for the 1/2" pump.