hydraulic pin removal

[Village Idiot]

Hi all,

I'm trying to take the hydraulic piston off of an excavator dipper stick. I can drive the pin out easily (the pin that fits through the end of the hydraulic piston "T"). I thought the piston would then drop free, but it seems to be stuck in there. I think that the bushings that fit in the end of the piston have gotten jammed against the inside of the dipper stick collar. I tried drifting the bushings back toward the center, but I can't get a good enough purchase on them to apply much force. I tried retracting and jerking on the dipper cylinder itself, but the thing won't break free. Is this a common problem with a solution I just can't figure out? Am I supposed to use some type of bearing puller to separate the bushing from the outer collar? My only other thought was to put a piece of wood against the end of the piston and hit it with a maul trying to force the "T" onto the bushing.

This is for an old Drott Cruz Air 40 so the piston size is pretty big (5"+ dia) and even the pin seems like 2.5"+ dia and at least a foot long.

Thanks for any help

 

[Dirthog]

That is what happened the bushing has moved in the cylinder about the only way to get it apart is to cut the bushing out with a torch you will never move the bushing any other way.

 

[638]

Sawzall down each side.

 

[Village Idiot]

Crap. I was hoping there would be an easy fix. I just got the machine at an auction, and it is about 12'6" tall. I can't find anyway to get it home without taking the dipper stick off so I can lower the boom a little more.

Thanks guys.

 

[Leejohn]

Might try hooking up the other end and put some power to it, might bend enough to get it to pull the cyl out.