lower pin for hydraulic cylinder on bucket arm nearest cab - won't extract

Tinkerer · Mar 28, 2020

There is a very slim chance the pin has some taper and you are beating it the wrong way. The machine looks to new for a pin to be seized that badly in the mounting ears.
The problem with pounding on the keeper pin end is that the pin will swell badly. Then you will have to maybe saw the pin off on both sides.

cjdgeorge · Mar 29, 2020

I will get the vernier out this AM . Crude estimation with a rule indicates it is the same. It travels such that receptor hole for lock bolt goes inwards, i. e. As you are in cab l to r. I can then be put back in place. Looked up in google what FBH stood for and had a big “larf” and can confirm it was very F big - a sledge So heat next.

Tinkerer · Mar 29, 2020

I think there is a slim to no chance the pin is tapered. But, there are situations anything is possible.
Be careful to NOT set yourself up for a financial rape from the owner of the machine when they see the burnt paint and beat up pin.

cjdgeorge · Mar 29, 2020

36 mm both ends give or take a burr or two

Left side from inside cab

Right side
The side I have been whalloping so a bit burred
the most movement I can get is about 0.5 or 1.0 mm

The industrial blowlamp is a bit like throwing a banana down Royal Avenue as they say in Belfast
Chris

Nige · Mar 29, 2020

I wonder if the pin could be made out of, shall we say, "less than optimum quality material", and has now adopted a similar shape to the aforementioned banana..?
That'd make it stick and assuming that is the case only a gas axe or an exothermic lance is going to get it out. Either way the pin will not survive.

Tinkerer · Mar 29, 2020

Perfect; a straight pin. Looks like the pin is starting to mushroom from the pounding on it.
I don't know what an industrial blow torch is in the UK.
In the US we use an oxygen/ acetylene powered torch with a rosebud tip.
I guarantee it would heat both of those ears.

Below this is what I would have a helper hold against the pin to prevent further mushrooming it.
Safety glasses are an absolute must have. I had an eye punctured once in a situation similar to what you have.
Hit hard and hit it squarely!

Ronsii · Mar 29, 2020

For what it's worth... never hit the pin directly!!!! always use a drift, punch, smaller pin, pipe,etc.... once you start mushrooming the ends you're in for a time of it!!!

Bls repair · Mar 29, 2020

Do you have access to something like this to try and press it out?

Bls repair · Mar 29, 2020

Is the pin locking bolt hole clear? Grind the mushroomed part of the pin off.

cjdgeorge · Mar 30, 2020

Done or tried all those helpful suggestions... Rang a Bobcat agent who WAS open... Nearest was Peterborough REally helpful. Answers: the only way to fix the bent threaded tube is to go to an hydraulic specialist with the whole ram and they fix it in a workshop. The only way to get the pin out is to ply pin ping pong There and back till it loosens. If push comes to shove they take the whole arm off and put it in a press. We have tried all the above options but are not considering welding up a frame and using a car bottle jack More later!

Vetech63 · Mar 30, 2020

(popcorn eating emote here....again)

Delmer · Mar 30, 2020

Vetech63 said:
(popcorn eating emote here....again)

Pretty good rental, huh? " a one week hire, a one week hire" (sung to the tune of "three hour tour")

Tinkerer · Mar 30, 2020

Please keep posting your progress.
You have a situation we've seen on HEF many times, and on our own machines.

Nige · Mar 30, 2020

My only worry is that the pin is slightly bent and that although at this moment it will move a little to & fro that’s the most your going to get out of it and it won’t come out without surgery.

cjdgeorge · Mar 30, 2020

Took advice on the car bottle jack as I thought this was hopeful. Apparently it does work if the jack can lift 80 tons! My super engineer mate came up with the idea of welding on a nut and bashing that to get it going in more and to avoid burring end. In the what has got it shifted to 50 mm± was a electric H breaker with a socket on the end. Cant post a video on this forum but will try to send a link.
Upshot is that the Peterborough firm RTC who were brilliant recommended Dave Whitby who does serious hydraulics and a chat with him was most illuminating. Apparently he has to fix hundreds of these Bobcat fixings as they are so weak. His solution is to cut out the original and weld a proper steel fixing in place - once done they never come back.... More to the point he has a delivery due next Wed about 5 miles from me and can pick it up and turn it around in 24 hours. AND he can supply a new pin with it as it is likely that this one will have to be cut out. More later..

cjdgeorge · Mar 30, 2020

Welder Dave · Mar 30, 2020

Fantastic idea on the breaker!

If it would have been me it would have happened when the machine is in the deepest mud hole surrounded by tree's that you couldn't get to it easily.

cjdgeorge · Mar 30, 2020

It WAS the two pipes were joined as a bypass to get the effing thing out to the lawn!

Welder Dave · Mar 30, 2020

Good you could get it moved to an open area.

Nige · Mar 30, 2020

Now the pin has moved in one direction can you get some lubricant on the exposed end and drive it back in the other direction..? Repeat back and forth as required until it finally moves far enough to get the cylinder out. You don't have to get the pin all the way out, although it might pay you to, then assault it with a decent angle grinder (the one lying on the floor by the welder will do the trick) and take a few thou off the pin so that it goes back in easier than it came out ..........

Breakers are severely underrated. Nice job whoever thought of that.

lower pin for hydraulic cylinder on bucket arm nearest cab - won't extract

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