Bobcat Parts

[David R]

I did this job for the local bobcat dealer. Cut out the old bushings and install new ones supplied by bobcat.

It was really shot. I cut it apart saturday with the Arc air, but had no camera. So this morning I took some pics and finished the job. I guess the hardest part was getting them in square on 2 planes with out having the machine it attaches to.





After going at it with the arc air. 5/32 or 3/16 rod, 225 amps 80 psi air. When using the arc air, I try to sacrifice the old part, not what I have to weld the new one to.


Cleaned up and "receptive" to the new piece

[David R]

I welded the first bead with 3/32 Lincoln 7018 at 85 amps, then made the rest of the passes with 1/8" at 130 to 140 amps.

I used what I had to make them square. They have to be right or it won't go back on the machine.



On the left you can see the groove worn in the steel from it being so sloppy.


One finished. Nothing beautiful, but it aint goin no where.


This the whole part and my other "work positioner"


Total time about 5 hours including picking it up from the dealer.

Thanks for looking

David

[specter]

WOW!! It looks like they operated that BobCat under seawater for a couple of years.
I have worked on some in BAD shape but that one is the worse I have seen.
It looks like you only did one side of the unit?

Nice work evenn Scotty on the Enterprise would have had a hardtime being a miracle worker on something like that.

[David R]

I did both sides, but the camera operator was out to lunch

Thank you.

David

[specter]

AH ok.It would have be very stupid for the owner to do only one side.

I take it the other side was just as bad as the 1st.

[duaneb55]

Another awesome "real world welding" job.

What is it used for - loading road salt?

I take it the upper section isn't clear all the way across to allow lining up both new bushings with a pipe/bar.

[farmersamm]

Doesn't look like clearance inside crossmember to put in a full sized alignment bar. It's offset, and partially hidden by the flange.

David-- Would it have payed to make a jig, or would that have pushed the cost thru the ceiling?

[Burnit]

Nice stickin' Dave, that thing was rough!

[David R]

Originally Posted by farmersamm

Doesn't look like clearance inside crossmember to put in a full sized alignment bar. It's offset, and partially hidden by the flange.

David-- Would it have payed to make a jig, or would that have pushed the cost thru the ceiling?

The bushings have an end in them so a bar is out of the question.

If I get more to do I will make a jig. I only get less than one a year.

Here is a straight on shot of the inside bushing. Its egg shaped pretty good and has been welded on too.





Thanks to all.

David

[MoonRise]

Taking the old crappy ones out was bad enough.

Then you have to put the news ones in, that's not so bad. Getting BOTH to line up and be square to the machine AND be co-axial to each other, that's kind of tricky.

Because you can't just run an alignment bar/pin/rod through both at the same time, I think you'd pretty much have to make an alignment jig that spans from both outside edges and lets you run alignment pins/rods/bars in to both at the same time. Of course that would mean a big honking chunk of steel alignment jig sitting around most of the time until you actually need it.

[Nichvegas]

A good dose of grease about every 8 hours would have saved them a lot of money and down time.

[paweldor]

Good job. I've done many Pin Bushing replacements over the years on machines up to and including the largest CAT loaders made. Each job was a challenge. Alignment isn't too bad on large excavator buckets when I could put a long pin through both bushings. I used the same method to align the bushings that you did. Works good if one takes one's time. Largest excavator bucket I ever did was a 72" bucket.

I used a large OA torch to cut out the old bushings though. I bought a new ArcAir torch a couple of years ago, used it once, sold it on eBay.

Again, Great Looking Repair.

[welderShane]

Nice fix!!!

[David R]

Originally Posted by Nichvegas

A good dose of grease about every 8 hours would have saved them a lot of money and down time.

Is that what those holes in the bushings are for? Grease fittings? Huh?

David

[eyeball engineer]

you should do this while your at it

excuse the $hitty lookin welds, I used a 110v mig, and heated the critical weld areas first with the torch, this is the only welder I have at home

[denrep]

Shoot I missed a good one!
By the title, I thought this was a thread hunting for Bobcat welder parts.

Nice work David R.

Well?
After the welding, did the pins still fit?
Or was it "grind to fit?"

[David R]

Denrep, I don't know, but I ASSume they fit because I didn't get a call.

Ya mean Miller Bobcat?

From David R?

The only thing that is miller is my elite helmet.

Nuttin against em, but all I ever had is red with NO trouble in 20 some years. Why change?

David

[David R]

Eyeball engeneer,

I like your handle. I like the fix you have , I have welded quite a few of those that were cracked some in 2 places on both sides.

David

[dabar39]

Originally Posted by denrep

Shoot I missed a good one!
By the title, I thought this was a thread hunting for Bobcat welder parts.

Nice work David R.

Well?
After the welding, did the pins still fit?
Or was it "grind to fit?"

I'll have to admit it too.... I also misinterpreted the thread title as referring to Miller Bobcat parts.

Good job on the repairs.

[farmersamm]

Ducking many beer cans/bottles.

I just gotta figure there's gonna be some heavy reaming, or grinding on the other end, depending on the bushing/pin clearances.

It's a relatively long bushing, and the tolerance for out of alignment assembly aren't too big. Not like a short bushing with the pin protruding from the other end.

[eyeball engineer]

Originally Posted by David R

Eyeball engeneer,

I like your handle. I like the fix you have , I have welded quite a few of those that were cracked some in 2 places on both sides.

David

thanks, your work is well done, I've done a handful of those bushings myself, we have a fleet of about 20 753's, s130's, and a few smaller and bigger skid steers. looks like you only had the bobtach, I like tackin those bushings lightly in place and then putting the bobtach back on the lift arms, set the pins and tack them real good, then I take it back of the arms and weld it up, to assure alignment. older machines that are beaters, I don't worry about doing that, there so worn out and sloppy it doesn't matter. the one pictured was a side job I did at my house.

[eyeball engineer]

we have a extended reach 853 turbo, the bobtach pivots a little different on the arm. The arm got worn out so we had this guy come out with this special bore welder to repair, it bored the bore out clean, and then the welder went on it welded it up perfect and then the bore machine bored it back to standard here's the link to the machine
http://www.borerepair.addr.com/photos.htm
, the guy who told me about it wanted to buy one and have me run it for him, but I don't know how busy I would have been able to be here in so cal, so I passed the opportunity up. when the other guy he knew came to repair that arm at my work I seen how much work it was, it took him about 7 hours for two bores from start to finish it was about 1400 bucks so it can be a money making machine but, what happens if things don't work out?

[David R]

Originally Posted by farmersamm

Ducking many beer cans/bottles.

I just gotta figure there's gonna be some heavy reaming, or grinding on the other end, depending on the bushing/pin clearances.

It's a relatively long bushing, and the tolerance for out of alignment assembly aren't too big. Not like a short bushing with the pin protruding from the other end.

No need to throw anything. I just do the best job I can with what I have and keep my eye on the $s. I think they will be OK if the rest of the machine is in the same shape.

Side jobs? I do em 40 to 50 hours a week. Lotsa variety. I like that part.

David