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Discussion Starter · #1 ·
Hi. I have finished taking apart my tractor for painting and the only real problem I have found is with my hydraulic pump coupling. It would seem that at some point the set screw that holds the coupling to the pump shaft fell out and the coupling shifted a little and I think it may have sheared the key.
Any suggestions on how to remove the coupling?

Thanks
Jonathan

86 Ingersoll 224 ser#14092893 Kohler 14 hp K321AS ser#1600628244

 

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Your needing a gear puller. They're cheap at Harbor freight and make sure and get a three jaw. Or since it's off and easy to take somewhere a shop should get it off pretty easy. Then it looks like you'll need a new coupler half.
 

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What you dont want to see is a chunk of the shaft missing from the key being sheared off. If that is the case then it looks like you will not only be buying a new love joy coupling but a new pump as well. These are pics of what you dont want to see



 

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I have a Parker pump here with about 30 seconds of use on it. The previous owner said something about another owner hooking the lines up backwards and then Boom. I tried getting a new shaft from Parker but they said that their small pumps are throw aways and its not worth it for me to just buy a shaft. I was going to assembly a spare and either hold on to it or sell it but now its sits in my shed as a paper weight.

YOu may also want to look at the seal since the seal on the pump that those parts I posted was toasted beyond repair.
 

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Jon

First one I've seen like that. If the puller starts to jamb , go easy you don't want to damage the pump.

You could cut it off if required

Stewart
 

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All he can hope for is that the key didnt roll over the keyway and take a chunk of material off the shaft.
 

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Stewart said:
That's True

Nobody wants to lose a chunk of there shaft. :trink:

Stewart
ya that would suck. :lol:

I am pretty sure the shaft on the pump is 9/16" The love joy I have in fron of me right now is from lovejoy-inc dot com and it has a part number of L-099. It is their L series units. The Love joy coupling in your pic has a crack init and I would replace it if I were you. Did your pump leak from the shaft seal at all prior to this?
 

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Jon and Brad

To me it looks like the key has worn into the coupling and it is Toast.

It will likely not pull off unless you can turn the coupling to line up with the keyway, it looks like the key is still sitting squarely in the shaft and that's a good thing.

Stewart
 

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Stewart said:
Jon and Brad

To me it looks like the key has worn into the coupling and it is Toast.

It will likely not pull off unless you can turn the coupling to line up with the keyway, it looks like the key is still sitting squarely in the shaft and that's a good thing.

Stewart
Hopefully the shaft can be salvaged but it may need to be removed from the pump in order to get the coupling off IF the coupling is jammed. Im not sure what type of tools or machinery you have access to Jon but if its limited then I suggest making an attempt to remove the coupling with a puller BUT do not go overboard on pulling it off. If you feel it is jammed on there then you may find yourself pulling the pump off and disassembling it in order to get to the rear of the shaft. If it were mine, I would try to secure the shaft in a collet (on a lathe or in a Bridgeport) and then try turning the coupling so the keyway lines back up with the key and then make another attempt at pulling it off. Im not sure how the stock pumps are assembled and I am basing my method off of my Parker pump

Or a machine shop will do it for you for a small fee I suppose
 

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Brad

That's an excellent thought.

Leave it to the experts to take care of the tough one's.

I can't tell you how many times I've F--- Up a perfectly good item.

The pros cost money but sometimes save more than they charge.

But hey we're Men and it's our Right :trink:

Stewart
 

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If you can't easily remove the lovejoy and/or the shaft is damaged I'd just weld the shaft to the lovejoy. A new lovejoy half is cheaper than a new pump.
 

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If you decide to take Bart's advice, then please heed my advice as well.

Put the grounding clamp of your welder onto the LoveJoy coupler half. Do not put it onto the pump body or you will wreck the pump.

Also, I don't believe that the shaft can be removed as a result of dismantling the pump. Most shafts are permanently fixed to the gear inside. The only way the shaft can be removed is with no coupler on the shaft and the shaft/gear combo being pulled out of the front pump-plate.
 

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Welding the coupling to the shaft won't do any good unless you can pull the coupling far enough that the shaft doesn't protrude through. With the shaft sticking that far through the spider won't engage. Also, some of the lovejoys seem to be made of steel and some are made of some type of cast material. It may also be steel but they are dark grey and don't rust. That looks like the type that you have. I believe that they are cast iron and if that is the case you will need some magic welding rods.
 

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Personally i would just cut it from each side and then try to spilt it with a chisel, if your carefull the the pump shaft should come out ok.
 

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Discussion Starter · #16 ·
Well after a days debate and reading the posts this evening (Thanks guys) I decided to go for it.









uhhhhh....:wtf:

I like Barts idea of welding the lovejoy to the shaft but I think Nuttcase446 is correct in that it has been cast.
Ebay, Salem Power or Cessna.......................................................
 

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My suggestion is this.

Clean up the shaft using a flat file to slowly remove the burrs and finish with Crocus Cloth to polish it smooth. Then try a brand new key in the cleaned up slot to see how much support it has on the shaft. I believe that Loc-tite has some products that can help you with this problem. Buy a new coupling half and put it all back together.

You may well get many years of use out of that pump yet so try to save it. To me, it's worth the shot.
 

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^ Loc-tite #271 "Stud and bearing mount" would be my suggestion. Must be heated for any future disassembly, does not give up easily.
 

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I looks from the photos like the keyway on the shaft is damaged. If that is the case, you can just have a new keyway cut in--not a big job if you have access to a mill and then it would be like new.
 
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