trash pump impeller removal ??

glennster · Mar 16, 2010

ok gotta rebuild one of my trash pumps. cant get the impeller off the engine crankshaft. has a screw with an o-ring in the center that i removed, but the impeller is stuck to the shaft. dont see how to get a puller on it. cant tell if the shaft is threaded or if it just has a keyway. about a 3 1/2 or 4 hp briggs motor. any body ever take one of these apart?? my bigger pump has an aluminum impeller that screws on the threaded crankshaft. heres a pic.

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Billy Shafer · Mar 16, 2010

If I find out I will let you know. I called the maker and they told me it screwed on. I am working on the same pump. Had mine soaking in rustbuster for a week. Still can't get it to move. Customer wants it off without breaking it.

Paulinkansas · Mar 16, 2010

Are you sure there isn't a small allen bolt in the impeller that thightens it down to a flat portion on the shaft?

buickanddeere · Mar 16, 2010

Looks like a tapered crank.Put the bolt back in about two turns from tight. Then whack the bolt head with a hammer.

BCnT · Mar 16, 2010

its hard to tell from pic but that center part looks tapered...if it is there should be a keyway and that flat spot tells me there is.
a small smack on the nose with that Harley fine adjusting tool mite jar it loose.

Billy Shafer · Mar 16, 2010

I tried the BFH tool didn't work. I have not found any key or lock down screw.

J-TEX · Mar 16, 2010

if that is a Pacer Pump which I believe its is, the impeller is a slip fit on the shaft. GENTLE prying with easy pressure on opposite sides of the impeller should break it loose. alot of time buildup of minerals or such can get on the back side of the impeller and cause it to stick. You will have to use some thin screwdrivers or flat bars to get in betewwn the imp and back plate.

Brad Gyde · Mar 16, 2010

I believe that last pump I worked on it did just slip on, and if I remember right, we heated it up to get it off.. Yea, I think it could have possibly damaged it, but ours was already pretty torn up and needed replaced (I don't know what was pumped with it, but it tore up the poor plastic impeller)

Brad

JML755 · Mar 16, 2010

glennster,
I worked on one just like that (hoping to put the pump on a better engine) for a month or so last summer and never did get it off. I was VERY afraid of damaging it as it was the part I wanted to save. Too much prying and I could see that the impeller plactic would probably give out before it broke loose. From what I could see, the best method would be to fab up a forked wedge kind of ball-joint tool to get behind the impeller and pop it off. That is, of course, if it's just pressed on. Anyway, glad you posted and hope to see a solution in a reply from someone.

Janicholson · Mar 16, 2010

Use a pipe tap on the outside of the center hub. then thread on a pipe coupling or flange fitting to pull on. Just thinking outloud Jim

26cows · Mar 16, 2010

is the shaft the same diamator or does it have a grove cut in? about 1/4" back for the end. try a power steering pump pulley remover tool. just a thought. david

Nedd · Mar 16, 2010

I've worked on several brands but I can't remember if was wacker or homelite that were reverse threaded onto the shaft. Might want to give that a try. I know there are some brands out there that are threaded on.

Bob · Mar 16, 2010

It's threaded on.

Turn it IN THE DIRECTION IT RUNS to unscrew it.

showcrop · Mar 16, 2010

I have been into a lot of pumps. The ones that had a screw into the shaft with an O-ring under the washer pretty much always push on pull off with the screw holding the preload on the seal. The O-ring is there because the fit on the shaft upon assembly is just loose enough that it would leak without the O-ring. So I will vote for the pry it to overcome rust approach.

flying belgian · Mar 16, 2010

Gosh if it has a o-ring on the cap screw then I think it must be slipped on, probly tapered as you should be able to see key way coming to end of shaft if it had a key. I would think threaded impeller would have o-ring behind impeller. Have a helper smack end of shaft with a brass punch while you are prying with 2 screw drivers. If it is tapered it should take only one good bang.

Bob · Mar 16, 2010

Or, NOT!

Thanks for posting back about how it came off!

trash pump impeller removal ??

glennster

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Billy Shafer

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Paulinkansas

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buickanddeere

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BCnT

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Billy Shafer

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J-TEX

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Brad Gyde

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JML755

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Janicholson

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26cows

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Nedd

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Bob

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showcrop

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flying belgian

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Bob

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