Pump stuck on shaft help !!!!

Afternoon lads

Common problem I guess, but I've had bars and all kinds of tools trying to push the pump (ws201) off of the 25 mm shaft on the engine with absolutely no luck at at all. The pump has a RS 500 reduction box on it which isn't helping ?

Any hints or tips to help me get this off please?

Thanks

Davycrocket said:

Afternoon lads

Common problem I guess, but I've had bars and all kinds of tools trying to push the pump (ws201) off of the 25 mm shaft on the engine with absolutely no luck at at all. The pump has a RS 500 reduction box on it which isn't helping ?

Any hints or tips to help me get this off please?

Thanks

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I did a pump exchange a few years ago and used a few cans of poundland air duster held upside with the straw and sprayed the shaft which froze it and reduced it's size by 2 thou, used a plate splitter to separate them.

Using bars or large screwdrivers puts undue stress on input shafts and bearing seals and seats

Thanks for the tip will give it a go tomorrow mate.

We couldn't get the gearbox off the shaft, the casing split, tried the freeze spray method to no avail. New gearbox coming today.

Davycrocket said:

We couldn't get the gearbox off the shaft, the casing split, tried the freeze spray method to no avail. New gearbox coming today.

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Sugar. Any clues as to why it wouldn't budge?

ched999uk said:

Sugar. Any clues as to why it wouldn't budge?

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Absolutely none mate, bearing and small gear still stuck on the shaft. Will need ground off if engine to be reused.

Davycrocket said:

Absolutely none mate, bearing and small gear still stuck on the shaft. Will need ground off if engine to be reused.

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I wonder if the woodruff key sheered and the shaft welded itself to the gearbox! Hope you manage to sort it.

ched999uk said:

I wonder if the woodruff key sheered and the shaft welded itself to the gearbox! Hope you manage to sort it.

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It's possible mate can't think of any other cause. 

Davycrocket said:

We couldn't get the gearbox off the shaft, the casing split, tried the freeze spray method to no avail. New gearbox coming today.

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My guess is either dissimilar metals corroding or the Woodruff key and keyway have been chewed up

Apw1210 said:

My guess is either dissimilar metals corroding or the Woodruff key and keyway have been chewed up

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Or a bit of both possibly ? Either way new box has arrived.?

Davycrocket said:

Or a bit of both possibly ? Either way new box has arrived.?

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How do you intend on removing it mate? Angle grinder and cut the shroud casing

Apw1210 said:

How do you intend on removing it mate? Angle grinder and cut the shroud casing

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Looks like that's the only way its coming off mate yeah.

Davycrocket said:

Looks like that's the only way its coming off mate yeah.

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Try applying some heat to the outer and gently tapping it with a hammer this will normally help separate things like this .   

Pjj said:

Try applying some heat to the outer and gently tapping it with a hammer this will normally help separate things like this .   

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Think it's past that stage mate seems like it's fused together !

Davycrocket said:

Looks like that's the only way its coming off mate yeah.

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If you can remove as much of the pump housing to expose the shaft and input structure you could possibly remove it using a puller providing all the force is equal and inline to avoid stressing the gearbox or engine crank

Apw1210 said:

If you can remove as much of the pump housing to expose the shaft and input structure you could possibly remove it using a puller providing all the force is equal and inline to avoid stressing the gearbox or engine crank

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I'll have too see if my mate has a puller it's not something I own ?

Apw1210 said:

If you can remove as much of the pump housing to expose the shaft and input structure you could possibly remove it using a puller providing all the force is equal and inline to avoid stressing the gearbox or engine crank

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It it’s of any help post some photos and ill give you some help if needed

Davycrocket said:

I'll have too see if my mate has a puller it's not something I own ?

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Ideally for that job a 2 jaw or 3 leg generic bearing puller is best suited

Apw1210 said:

It it’s of any help post some photos and ill give you some help if needed

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Cheers Austin I'll have a go tomorrow

Davycrocket said:

Think it's past that stage mate seems like it's fused together !

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You will be surprised what a bit of heat will do we used to do it all the time when I worked in the garage worked 9 times out of 10 , but you do need to get it very hot . We used an oxy acettelyne torch  

Pjj said:

You will be surprised what a bit of heat will do we used to do it all the time when I worked in the garage worked 9 times out of 10 , but you do need to get it very hot . We used an oxy acettelyne torch  

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Not something I posses unfortunately mate

Davycrocket said:

Not something I posses unfortunately mate

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Have you got a plumbers blow torch ?? This will also work but takes longer to heat it up