Yesterday’s aggravation

Bri963

Bri963

Well-known member
So the reasoning, we have a Portapower and various rams for different jobs. The OEM ones are usually made by third parties and are way Oversized for this job, and as Mick said need to be hung off a crane or forklift. Hence what I knocked up. A ram will only exert so much force and the threaded bar is Sized so that any two will take more than the ram can put out. Four bits of threaded bar, two plates, a bit of drilling, under £300, OEM tool, over £8,000 for the basic kit. Tooling extra.

Mick, best day’s work I did was getting the portapower for our set up. I’ve made a few jigs so I can use it for one-off jobs.
 
Mick-the-fitter

Mick-the-fitter

It’s what I do!
Bri963 said:
So the reasoning, we have a Portapower and various rams for different jobs. The OEM ones are usually made by third parties and are way Oversized for this job, and as Mick said need to be hung off a crane or forklift. Hence what I knocked up. A ram will only exert so much force and the threaded bar is Sized so that any two will take more than the ram can put out. Four bits of threaded bar, two plates, a bit of drilling, under £300, OEM tool, over £8,000 for the basic kit. Tooling extra.

Mick, best day’s work I did was getting the portapower for our set up. I’ve made a few jigs so I can use it for one-off jobs.
Click to expand...
Yeh exactly that, exactly where I am, ok next question, can you show me everything you did, find prices for me and add your bit on, say half a crown🤣 the reason! I am getting old now (*3) this year to be knocking pins and bushes out of dipper ends with a hammer! P.M if you wish👍
 
Bri963

Bri963

Well-known member
Which machines are you working on, Mick? A lot of the pins on the Cat machines have a threaded bore, metric coarse, and I tackle these with a hollow ram. If you’ve got access to a bit of metalworking equipment, you can make everything else up. I’ve made a spacer by welding a plate across a piece of heavy pipe, and put a hole in the plate. Length of threaded bar, 10.9 grade, screwed into pin to be removed, pipe and plate over the top, hollow ram, a very thick washer and a couple of nuts. When you put the pressure on, the pin pulls into the pipe. Personally I’ve never had an issue with boom, stick or bucket pins once they get moving, though on occasions they’ve needed a. tap to start them.

What I have struggled with is axle pins on backhoes, as these are a dry pin. I’ve had 40 tonnes plus gas to get one of these out before now.

My method for bushes is blast the grease out, and several runs of stick weld and a long punch. Never needed a different method, even on JCB bushes. Even though they are only slightly ferrous, trying to weld them pulls them loose from the bore and they’ll move easily. Refitting them I use the hollow ram from the opposite side, and either a turned top hat on big bushes, or a thick washer on smaller ones.

Don’t know whether this is any help, or y already do this, but hopefully someone on here will benefit. When I get back into work I’ll get a picture or two of some of the bits we’ve made.
 
Bri963

Bri963

Well-known member
IMG_0231.jpeg

Does this help a bit?
 
Mick-the-fitter

Mick-the-fitter

It’s what I do!
Lots of different machines, I want to come up with a pin press to push mainly but I saw your clamp and ram set up and could start with that and a pedal power pack, the adaptors I would build as required for different apps.
 
D

DaveDCB

Well-known member
Bri963 said:
What I have struggled with is axle pins on backhoes, as these are a dry pin. I’ve had 40 tonnes plus gas to get one of these out before now.
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is that the front pivot axle?
I had to have one replaced once… cost about£800 horrible things!!
, since that day I always greased them twice daily and never had a problem since!
 
K

kato512

Well-known member
You used to be able to pick up enerpac equipment on ebay at reasonable prices. Not so much now. Search for hollow cylinders and keep an eye out. Just watch for the stroke length when buying 100mm is obviously better than 50mm. This seems a bit steep to me

 
Bri963

Bri963

Well-known member
DaveDCB said:
is that the front pivot axle?
I had to have one replaced once… cost about£800 horrible things!!
, since that day I always greased them twice daily and never had a problem since!
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They aren’t all greasable. I’ve twice on different machines had the retaining bolts shear and the pin migrate forwards into the batteries, but if I’ve ever wanted to remove front axles it’s been a battle to get the pins moving.
 
Bri963

Bri963

Well-known member
kato512 said:
You used to be able to pick up enerpac equipment on ebay at reasonable prices. Not so much now. Search for hollow cylinders and keep an eye out. Just watch for the stroke length when buying 100mm is obviously better than 50mm. This seems a bit steep to me

Click to expand...
Enerpac quality has gone off. I bought a 30 tonne solid ram and the connector didn’t even sit square in the ram, first time I used it it leaked like anything. Regarding stroke length the longer the stroke the lower the force as there’s only so much oil in the pump. Next ram I buy will probably be HyForce.
 
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Mick-the-fitter

Mick-the-fitter

It’s what I do!
Bri963 said:
No mate, the hollow ram does the work. The threaded bar runs through the middle. I’ve done small machines just pulling the bushes in with threaded bar and washers.
Click to expand...
Example: end of dipper bushes are pushed in on some machines from both sides to a fixed spacer, so they have to be pulled out from both sides, so the pulling piece needs to go through the bush first!
 
Bri963

Bri963

Well-known member
Mick-the-fitter said:
Example: end of dipper bushes are pushed in on some machines from both sides to a fixed spacer, so they have to be pulled out from both sides, so the pulling piece needs to go through the bush first!
Click to expand...
You can get expanding pullers but they’re generally nowhere near man enough to pull these types of bush. Your stick welder is your best friend for loosening these. Once you‘ve welded on them and quenched them, they don’t need a lot of backache to knock out, but you need to be generous with the welding, and don’t do like one of my mates did and weld the bush in place! Thinking about it, I suppose an expanding puller would do it after you’ve put a bit of weld in there.

312 electrodes will take to most of these bushes, but mostly I just use rutile.
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
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