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Bobcat  > General Repairs  > 743 lift arm pins and bushing replacement  
 
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 Author Thread: 743 lift arm pins and bushing replacement
Centurion is not online. Last active: 7/3/2012 10:02:34 AM Centurion
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743 lift arm pins and bushing replacement
Posted: 03/23/2011 11:30 AM

Hello everyone. I have come to the conclusion that I need to replace the upper pins and bushings in the lift arms. They are worn bad, and allow the arms to shift from side to side, and spread at the pivot pins. It got so bad, it cracked the cross member in the front, that was previously welded when I bought the machine. I have done a search to see if there was any advice in this area, but I could not find anything. Basically I am looking for advice on how to proceed with this repair, and if i have the pins and bushings made, what kind of material should i use? anything would be helpful.I have an idea how to proceed, but figured why re-invent the wheel.

 

Fred


Bobcat 743 (1988)
Kermode is not online. Last active: 9/30/2012 7:02:24 AM Kermode
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Re: 743 lift arm pins and bushing replacement
Posted: 03/23/2011 04:38 PM
You should be able to buy pins and bushings from your local Bobcat dealer for less than you can have them made. After that, you need to support the boom with some kind of hoist and knock the pins and bushings out. Be prepared, there may be more damage to the boom and mounting points. You may have to build up holes and line bore the boom. Might be very expensive.
Tazza is not online. Last active: 11/20/2014 1:48:51 PM Tazza
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Re: 743 lift arm pins and bushing replacement
Posted: 03/23/2011 04:39 PM

Hi Fred

What pins are you talking about? the ones for the tilt ram or the main pivot ones on the top rear of the machine?

I mad new pins and bushings of 4140 and got them heat treated, they will not wear out in my life time! they are that hard.

Give a few more details and hopefully i'll be able to give you some advise.


Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
Centurion is not online. Last active: 7/3/2012 10:02:34 AM Centurion
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Re: 743 lift arm pins and bushing replacement
Posted: 03/24/2011 01:46 AM
THe main pivot pins on the top rear of the machine. There is a lot of play at that point.

Bobcat 743 (1988)
Tazza is not online. Last active: 11/20/2014 1:48:51 PM Tazza
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Re: 743 lift arm pins and bushing replacement
Posted: 03/24/2011 07:23 PM

The way i did it was to cut the old bosses out of the arms, as stated you need to support them, there is a lot of weight here. I machined a new pin and boss, slid the boss into the arm, lowered the arm into position, put the new pin in and welded the boss in. The pin acts like a locator so you can weld the inside. Lift the arms and weld around the boss like it was before you removed it.

I did this about 5+ years ago now, there is still no wear in this machine.


Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
Centurion is not online. Last active: 7/3/2012 10:02:34 AM Centurion
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Re: 743 lift arm pins and bushing replacement
Posted: 03/27/2011 06:43 AM

Did you have to remove the hydraulic lines completely from the arms, or just drop them form the clips? The process you described is what I had in mind, so I guess I am heading in the right direction. Once I get the parts, I will begin the task, and let you know how I make out.

 

Fred


Bobcat 743 (1988)
Tazza is not online. Last active: 11/20/2014 1:48:51 PM Tazza
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Re: 743 lift arm pins and bushing replacement
Posted: 03/27/2011 02:09 PM
When i repaired the cracks in the arms i removed the lines, just twist the metal clips down. To do the bosses you could leave the lines attached. If you have a lathe, you can make all new bosses with replaceable bushings if you are that motivated. I have pictures of mine somewhere.

Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
Centurion is not online. Last active: 7/3/2012 10:02:34 AM Centurion
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Re: 743 lift arm pins and bushing replacement
Posted: 05/06/2011 12:10 PM

Well, got all the bushings for replacement, ended up removing the arms completely from the machine. The bushings are the most difficult to remove that I have run into, has taken evry night after work this week to remove the arm bushings and so far 2 of the frame bushings, one more to go tonight. Plan is weld in the bushings in the frame, then slide arms in place, tack inside and then weld the outside, as tazza suggests. I think if I had not removed the arms, I would have had a more difficult time, also, did not want to use cutting torch near engine and fuel. Once these are done, next step is to replace lower tilt cylinder bushings in bobtach. Will let you know how i progress

 


Bobcat 743 (1988)
Tazza is not online. Last active: 11/20/2014 1:48:51 PM Tazza
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Re: 743 lift arm pins and bushing replacement
Posted: 05/08/2011 03:03 PM

Good to hear you are making progress.

The bobtach bushes are fun...... I have had to replace the bosses on a few machines because the wear was so bad. I used a plasma cutter to gouge it all out, took some time, but worked well.


Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
Centurion is not online. Last active: 7/3/2012 10:02:34 AM Centurion
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Re: 743 lift arm pins and bushing replacement
Posted: 05/15/2011 05:10 AM

Well finally am up and running again, was not able to change out the bob tach bushings, wrong parts from dealer again, I guess i am going to have to find material, and make my own for that part of the project. Since I changed all the pins and bushings in the arms, everything lines up great, and I am not cracking the cross member anymore. Had to remove arms completely to complete the job. One thing that helped was for one week prior to project start, I sprayed PB blaster on all the hydraulic connections, they were much easier to loosen with that being done. Previously I had tried loosening them and was twisting metal hyd. lines.

 

Fred


Bobcat 743 (1988)
Tazza is not online. Last active: 11/20/2014 1:48:51 PM Tazza
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Re: 743 lift arm pins and bushing replacement
Posted: 05/15/2011 03:06 PM

Good to hear you had success with the job. Some of the hydraulic fittings sure can be tight!


Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
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