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  1. #1

    Join Date
    May 2004
    Posts
    5
    Location
    Southern CT
    Tractor
    Kubota B21

    Default Stuck backhoe pins

    Hi all, I definitely could use some help.

    I've been pounding on the pins that hold the pivot arms to my stick and backhoe linkage all day without budging them. (kubota B21 with BT751 backhoe). I've tried heat without success, penetrating oil also. This is my first attempt at pin removal. Am I doing something wrong, or are these pins just that hard to get out?

    Appreciate any and all help!

  2. #2
    Super Member JerryG's Avatar
    Join Date
    Apr 2000
    Posts
    7,198
    Location
    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: Stuck backhoe pins

    I don't know where it is at, but somewhere here, there is a thread about this problem. Best that I can remember, they cut the pins with a thin saw. Some had replaced the pins with non-hardened pins, which caused the problem.

  3. #3
    Elite Member
    Join Date
    Sep 2003
    Posts
    4,144
    Location
    New Brunswick, Canada
    Tractor
    Kubota L5030 HSTC, MF 5455

    Default Re: Stuck backhoe pins

    If the pins wear you end up with what looks like 3 offset cylinders stacked up.
    See attachment

    When trying to drive the pin out, the part supported by the middle will move into the worn area and prevent the pin from coming out.
    Attached Images Attached Images

  4. #4
    Platinum Member Lazy's Avatar
    Join Date
    Dec 2003
    Posts
    512
    Location
    Missouri
    Tractor
    ford 1920 w/fel and bh, case 470, allis chalmers B 1937, JD 450 track loader, Case vac, 3 cub cadets ford lgt 125, Kubota 2230/60 inch mower.1948 farmall cub 1953 farmall cub

    Default Re: Stuck backhoe pins

    Hi
    I just removed and replaced the pin on the dipperstick for a 758B backhoe.
    We used a torch and heated the boom and using a pipe wrench ( 36 inch with a cheater bar to rotate the pin) and a large sledge to pound the pin. we were lucky the pin had moved out about 2 inches enabling us to get the wrench onto it. It took us about 3 hours to remove the pin. We had thoughts of renting a magnetic base drill and drilling it out. I think we were lucky the pin had move out about 2 inches before freezing up
    It looked like the person we bought it from failed to grease the pin it was dry and rusted no grease past the grease fitting.
    It was tight enough it sheared both the keeper pins that keep the pin in place.
    To rotate the pin with the pipe wrench and cheater bar we would place the end of the bar on the ground and use the hoe hydraulics to lower the boom for leverage.
    we used enough force we ended up bending the pipe wrench handle about 20 degrees.
    You need at least on person to help you, my son n law helped me and there were times another pair of hands would have been helpful
    I now wish I had made some pics along the way.

    Charlie.

  5. #5
    Veteran Member
    Join Date
    Dec 2002
    Posts
    1,534
    Location
    Blair, Ne.
    Tractor
    L3130

    Default Re: Stuck backhoe pins

    A little late now but letting a some PB blaster, etc.. soaking on the pin may have helped quite a bit. Might have saved the pipe wrench, don't know just a thought.

  6. #6
    Platinum Member Lazy's Avatar
    Join Date
    Dec 2003
    Posts
    512
    Location
    Missouri
    Tractor
    ford 1920 w/fel and bh, case 470, allis chalmers B 1937, JD 450 track loader, Case vac, 3 cub cadets ford lgt 125, Kubota 2230/60 inch mower.1948 farmall cub 1953 farmall cub

    Default Re: Stuck backhoe pins

    Hi
    I need to buy some PB blaster I keep hearing how good it is I did use liqued wrench on it for about a week but I don't think it did any good the pin was totally dry when we got it out. I think the heat done the job. The wrench lives on for another tough job it was made in the USA. back when tools were made to last from good steel and before Harbor Freight.

    Charlie

  7. #7
    Elite Member
    Join Date
    Sep 2003
    Posts
    4,144
    Location
    New Brunswick, Canada
    Tractor
    Kubota L5030 HSTC, MF 5455

    Default Re: Stuck backhoe pins

    Sorry, yeah, regular old rust can hold a pin in too!

  8. #8

    Join Date
    Aug 2002
    Posts
    7,386
    Location
    North East CT
    Tractor
    2003 Kubota BX-22

    Default Re: Stuck backhoe pins

    I have been using PB Blaster for a few years now, and while it works well, it isn't the end to all problems. There are some things that it just can't break loose. I had a problem with a rusted shaft in a snow blower auger and put it into a press to break it loose. At 50 ton, we gave up and said it will never come apart. A couple of seconds after that, there was a loud sound that sounded like the crack of lightning. It was the shaft finally giving in. After that, it moved slowly, but it did come out. Used PB Blaster on that unit, but it was the press that finally made it move. Sometimes, it just takes some more persuasion than that which comes in a can. [img]/forums/images/graemlins/grin.gif[/img] [img]/forums/images/graemlins/grin.gif[/img]

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