bolt removal from hydraulic pump

[G6 at Snook, TX]

Gentlemen,

I am trying to remove the right chamber on the pump I recently replaced to see what is wrong. Well, three of the bolts came out easily, but the fourth (top, rear) spins in place and does not come loose. I have tried a vice grip to get the bolt started, but to no avail. I have tried a chisel to get it moving, but again no go. It spins, but does not come out. It is still close to the chamber with no daylight. What else do you suggest I do? Thanks.

 

[Joe T (CO)]

I would grind the head off the bolt.

Was it installed into a heli-coil?

 

[ZANE]

It has pulled the threads out of the pump housing.

You can weld a big nut to the head of the bolt and use an impact tool to pull it out of the housing. Then you will have to either go with the next size larger bolt and retap the hole and drill out the hole in the pump chamber or use Helicoil insert.

 

[souNdguy]

Ditto the other 2 guys.. the bolt has pulled threads on a lower portion, and wiped the threads on the upper portion enough to spin. thus there is a chunk of bolt with a gob of threds stuck on it not making it out the hole..

if you can get the cg's on it and pull while turning you might get enough play to put a screwdriver or chissle under it.. might be able to drive a chissle unde rthe head and pry up while turning.

can always cut the head off to get at the shank too.

I've drille dout bolts like that too.. use the VG's to hole the shank or head an dthen drill them paper thin hollow and then crush them in on themselves... not a bad idea as you will be OS the hole anyway for a retap..

soundguy

 

[G6 in Snook, TX]

In retrospect, I am glad I purchased that other hydraulic pump from John Smith two weeks ago. It has worked well so far in the tractor this failed pump came out of.

We had it worked on about three years ago and they might have put a helicoil into the bolt hole in question. As you may recall from an earlier post that the gasket failed. It was right next to that bolt. I might try the impact wrench on it and see if I can spin it out quickly. If you were referring to another type of impact tool let me know.

I do have another question or two: Ultimately, do you think this pump is salvageable? Two, if I need to re-tap the bolt hole, what type of tool can I use to do this, or would I be better served by taking to a man who has a wide range tools to do this effectively?

Thanks for the help.