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JD 820 replacing Bosch Hydraulic Pump (leaks)

H

hedgeless_horseman

Member
The hydraulic pump on my 820 (3 cyl) with manual steering has been leaking more and more. Apparently, the OEM Bosch that is on mine is no longer available, nor are the seals to rebuild it, so I ordered a new one from Legacy Hydraulics.

The Service Manual says I need to remove two of the rivets in the drive-shaft-flex-coupling-thingy before using a commercial-type extractor to get the old pump removed. However, my very smart Irish friend says that I should be able to use a chisel or air hammer to pop the taper free without removing the rivets.

I have attached photos of the old part attached to coupling and shaft, and the new pump showing the taper.

Anyone have experience doing this type of job, with opinions on exactly where to place the chisel? just under the nut? Under the coupling closer to the pump?

Can I really do this without removing and therefore replacing the two rivets?

Thanks,

h_h
mvphoto83385.jpg


mvphoto83386.jpg
 
As a possible suggestion that might work if you are not concerned about damaging the original pump would be to use a pickle fork as used for
automotive tie rod ends and wedge it between pump and coupler. Fork would hopefully push on center shoulder of drive hub and not apply pressure
to drive ears as you will break ears off if it does. Wedge it in tight then give hub a crack with a hammer and punch on hub between the fork
teeth. Should pop off. DW
 
I am trying to avoid damaging the original pump, just so that I can attempt to rebuild it for giggles, and to have a spare in these uncertain times.

Not certain that hammering a cold forged chisel into the works will achieve that.

It seems like many people are trading in their slide hammer extractors for the twisty kind that use a cordless drill. Interesting idea.
 
Well, new hydraulic pump is installed and it works perfectly. No leaks!

I had to get two longer hex head bolts to mount it, as the through holes are much longer in the new pump. Otherwise, the threading and fit is the same.

mvphoto83562.jpg
 
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