Stuck ram pin
- Thread starter super4
- Start date
davidroberts30
Member
- Location
- pembrokeshire
pray, miracle
i dont envy you
i dont envy you
davidroberts30
Member
- Location
- pembrokeshire
if its seized to the outer parts you "may" get away with heating the pin red hot and letting it cool
if its seized in the center you will have to gas it out probably
if its seized in the center you will have to gas it out probably
Netherfield
Member
- Location
- West Yorkshire
What is it that locks it in place?
And if heat won't shift it line boring could be the answer.
And if heat won't shift it line boring could be the answer.
It's has a circlip on each pin end. Can only get one off as to tight the other end.
- Location
- DD9.
Local manitou dealer has a pecker attachment for mini digger with a forklift backplate they use to knock stubborn ones out. Very effective.
Batty
Member
Got one out of a Kramer by tack welding a rod on end with a depression in it then pecker on mini digger
When they have been clouted in carelessly with a hammer it can cause the end of the pin to burr. Once this has happened you have to get rid of the burr.
The only other way is enough mechanical pressure to coldform the burr as you press it through.
If you have a press ram or even just a fine pitch large diameter thread and nut welded or bolted to a chunky 40kg/m size metal frame around the boom you could apply enough force to move it. Press, whilst gently tapping with a hammer (shock load) it far enough out so you can wet and dry off the burr and the press back the other way pushing your clean end of the pin through the bush.
The only other way is enough mechanical pressure to coldform the burr as you press it through.
If you have a press ram or even just a fine pitch large diameter thread and nut welded or bolted to a chunky 40kg/m size metal frame around the boom you could apply enough force to move it. Press, whilst gently tapping with a hammer (shock load) it far enough out so you can wet and dry off the burr and the press back the other way pushing your clean end of the pin through the bush.
davidroberts30
Member
- Location
- pembrokeshire
Cant be tight if its a liquid
- Location
- America's dairyland
If you can't or don't want to set up to press it out, then you could drill the center of the pin and blow a little more out with a cutting torch, that will soften and reset the metal so it will shrink as it cools. If you were comfortable with an oxygen lance, you would have already done it, but that's a reasonable possibility also.
I'm assuming that's a closed section and no access to cut the pin.
I'm assuming that's a closed section and no access to cut the pin.
- Location
- Lorette Manitoba
I would heat it red hot and weld a tube to the outside to closely support a nearly like size rod so you can actually hit it square and not rivet it anymore. Before it’s completely cool get it oiled up well the capillary action of cooling will draw oil in. It that doesn’t work drill it out and tap it with an inch bolt and set it up to pull while your man Friday hits it from the rear. Heart felt sympathy on this one.
- Location
- North Scotland
Weld a large nut or something onto it so you can get a square hit on it
ACEngineering
Member
- Location
- Oxon
its just the rod end and when extended will be miles away from the cylinder, you couldnt damage this ram with heating that boss if you wanted too, but you will melt the boom hoses in the top corners of the box section if get hot enough.
ACEngineering
Member
- Location
- Oxon
Okay so when on site and faced with this problem i drill a hole up the pin, 16mm, get a m16 bolt thats shorter than the hole you just drilled and place in the hole. Then smack the whatsit out of it with sledge hammer. this gives you a direct hit to the pin with out swelling the end of the pin or risking anyone holding a bar up to it.
once it moves get a longer bolt and add a nut with the threads drilled out as a spacer, keep going with longer bolts and more nuts (dont go more than 3 or 4 nuts if really tight! bolt tends to break when you get longer) once moved enough you can then lodge a bit of bar in the hole anyway.
Heat most likely will not work, the pin could be siezed in either boss either side of the boom or even in the ram rod eye as well. you will not reach the rod eye with heat at all unless you cut a hole out the top of the boom.
If the above does not work then a pecker on a digger while supporting boom is the best option or a thermic lance which will just blow the whole pin right through one side to the other, which is quite exicting but you will need to strip the boom hoses back the the tilt and aux if doing that or you may melt them and then your going to loose another £800 or so replacing the pipes.
if the ram is split, scrap the cylinder and make a new one from scratch, do not weld it it will just crack again and again.
ACEngineering
Member
- Location
- Oxon
Have you tried the other cylinder end of the ram first? tbh the back end is normally the worse for siezing in!