Pin Won't Budge

[Mike in Dewey]

I know that this is an often asked question, but would like to know if anyone has come up with a new solution. In taking apart my backhoe, all but one of the pins on the swingframe assembly came out easily enough, but one is refusing all attempts. The five and ten pound hammers did squat; a twenty pound hydraulic hammer just annoyed the face of the pin, and the bottle jack chained to the assembly tightens up fine but that's about it. I did have a problem removing the retaining bolt, but a slide hammer finally persuaded it to come out; however, not until all of the bolt threads had been wiped off. Over a couple of days I have soaked everything in JB Blaster plus WD-40's similar product (Rust Release Penetrant Spray). Still, nothing. I guess the next effort will be to remove the hydraulic hoses and try some heat, unless someone has a better idea. I am almost resigned to damaging the swingframe assembly to the point that it will need to be replaced, so intelligent drilling alongside the pin might be an option, but I do not have the intelligence to know where I should drill.

 

[Billrog]

I was in the same predicament years ago heat, 20 ton jack , big hammers nothing would move the pin finally I took my cutting torch and burned it out. If you can get at it drill down the center of the pin then you can get a can of freeze it to shrink the pin and knock it out.

 

[CalG]

Is the pin rusted in? If so, oil and vibration with an air hammer can loosen the corrosion. Or heat and bees wax. Wax expands when it cools and pushes things apart.

If it's not rust, how big a lever did you put on that 20T jack? put on enough hydraulic oompf to but a seal in the jack if you need too.
You might need to buy a piece of 1/2 in plate for the jack base and redo those chains. Loose wraps like that are unpredictable.

 

[stuckmotor]

I've seen a jaw puller work where a jack and chain failed.
If a ridge has been worn into the pin, taking the pin out of the other end of the cylinder might give it some wiggle room.

 

[whis]

make sure jack is full of oil when its on its side

 

[Tractor Seabee]

The chain in the picture hides the pin and how it fits/works. New picture w/o the chain by trigger some more ideas. Heat usually works. Heat the outside surfaces then use hammer and punch. Punch needs to be close to the pin size for best force. Be careful banging with a hammer and punch; you may mushroom the end and make it worse. Final solution is to drill it out using increasing size bits till only a shell is left then collapse it. Try forcing

Ron

 

[whis]

also turn jack so pump handle is down or lowest point

 

[Raised on a Deere]

A sharp blow at the right point while jack is exerting maximum force, on opposite end of pin or the housing or such.

 

[joecdeere]

I'd either saw the pin on either side of the cylinder end if there's room for the blade (had to do that to my Ford earlier this year) or drill the pin, no way do you want to buy that swing post!
Another thought, how about going ahead and laying the hoe over on some cribbing so you can hammer straight down on it?

 

[dragoneggs]

I was in the same predicament years ago heat, 20 ton jack , big hammers nothing would move the pin finally I took my cutting torch and burned it out. If you can get at it drill down the center of the pin then you can get a can of freeze it to shrink the pin and knock it out.

I assume you have moved the swing arm around its range and tried at different positions? Otherwise freezing the pin might help as Billrog suggested.