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Pallet Jack Repair

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  • Pallet Jack Repair

    The arms on one side of my customer's pallet jack broke. To remove the arms it was necessary to press out the shaft that the arms pivot about. The shaft is retained by a blind roll pin loaded in double shear. The blind roll pin was flush with the surface so I had to build the roll pin up with weld so that I could remove it with a slide hammer. My customer had cut out a portion of the bushing that retained the shaft in an attempt to free the pin.. Unfortunately the pin was also engaged on the other side, which was more than adequate to resist the hammer blows attempting to remove the shaft. I welded up the bushing. Last but not least I noticed that the bearings were shot.

    Don
    Attached Files
    Miller Thunderbolt
    Smith Oxyacetylene Torch
    Miller Dynasty 200DX
    Lincoln SP-250 MIG Welder
    Lincoln LE 31 MP
    Lincoln 210 MP
    Clausing/Colchester 15" Lathe
    16" DuAll Saw
    15" Drill Press
    7" x 9" Swivel Head Horizontal Band Saw
    20 Ton Arbor Press
    Bridgeport

  • #2
    Here are the rest of the pictures:
    Attached Files
    Miller Thunderbolt
    Smith Oxyacetylene Torch
    Miller Dynasty 200DX
    Lincoln SP-250 MIG Welder
    Lincoln LE 31 MP
    Lincoln 210 MP
    Clausing/Colchester 15" Lathe
    16" DuAll Saw
    15" Drill Press
    7" x 9" Swivel Head Horizontal Band Saw
    20 Ton Arbor Press
    Bridgeport

    Comment


    • #3
      They all get abused like that...this one seems to have steel wheels and they are about 1/2 inch too small on diameter . Explaining why the arms wear by dragging on the floor.

      Nice pin puller

      Comment


      • #4
        Originally posted by snowbird View Post
        They all get abused like that...this one seems to have steel wheels and they are about 1/2 inch too small on diameter . Explaining why the arms wear by dragging on the floor.

        Nice pin puller
        Do you think that it is possible that the steel wheels have worn enough to allow the arms to wear?
        Miller Thunderbolt
        Smith Oxyacetylene Torch
        Miller Dynasty 200DX
        Lincoln SP-250 MIG Welder
        Lincoln LE 31 MP
        Lincoln 210 MP
        Clausing/Colchester 15" Lathe
        16" DuAll Saw
        15" Drill Press
        7" x 9" Swivel Head Horizontal Band Saw
        20 Ton Arbor Press
        Bridgeport

        Comment


        • #5
          Originally posted by Don52 View Post
          Do you think that it is possible that the steel wheels have worn enough to allow the arms to wear?
          I don't think so, they probably were made from stock material available at the time of modification, was it because the nylon/urethane originals were too soft or to big, who knows or it is the remaining core of a wheel that lost it's "tire" ?

          It looks like a lift rite, and all the parts are available for rebuild/repair

          Lots of info here: http://www.liftrite.com/ReplacementParts.aspx

          Comment


          • #6
            Your post got me thinking.
            I believe that the reason that the arms are dragging is because of wear on the bushings on the arms. If the bushings wear .020" then the roller looses .200" of lift. If my customer had turned the adjusting screw on the connecting rod to make up the wear or replaced the worn bushings, then the arms wouldn't wear and the link wouldn't have broke. Do you agree?

            Thanks for the link for replacement parts.

            Don
            Miller Thunderbolt
            Smith Oxyacetylene Torch
            Miller Dynasty 200DX
            Lincoln SP-250 MIG Welder
            Lincoln LE 31 MP
            Lincoln 210 MP
            Clausing/Colchester 15" Lathe
            16" DuAll Saw
            15" Drill Press
            7" x 9" Swivel Head Horizontal Band Saw
            20 Ton Arbor Press
            Bridgeport

            Comment


            • #7
              the rollers (wheels?) are too small, it's made , for the roller link to rest on the stoppers when completely lowered, there is also a busching right next to your repair that is bigger and act as a roller too. Worn shafts and buschings are not helping but are not the major cause of the problem. I'm 90% sure it's rolling on the rims as it is.

              Comment


              • #8
                Originally posted by snowbird View Post
                the rollers (wheels?) are too small, it's made , for the roller link to rest on the stoppers when completely lowered, there is also a busching right next to your repair that is bigger and act as a roller too. Worn shafts and buschings are not helping but are not the major cause of the problem. I'm 90% sure it's rolling on the rims as it is.
                I looked and the arms stop on the underside of the forks as shown in the attached picture. I agree with you that the wheel or rollers play a crucial role in the wear of the arms. Thanks for helping me to understand the root cause of the problem.

                Don
                Attached Files
                Miller Thunderbolt
                Smith Oxyacetylene Torch
                Miller Dynasty 200DX
                Lincoln SP-250 MIG Welder
                Lincoln LE 31 MP
                Lincoln 210 MP
                Clausing/Colchester 15" Lathe
                16" DuAll Saw
                15" Drill Press
                7" x 9" Swivel Head Horizontal Band Saw
                20 Ton Arbor Press
                Bridgeport

                Comment


                • #9
                  Originally posted by snowbird View Post
                  It looks like a lift rite, and all the parts are available for rebuild/repair

                  Lots of info here: http://www.liftrite.com/ReplacementParts.aspx
                  I sent them an email and they were very helpful.
                  They were able to identify the model number from my pictures of the hardware even though the model tag was illegible.
                  Their prices were very reasonable so I ordered the arm kits as well as the wheel assemblies. They confirmed that the steel wheel actually do wear out. Thanks for your help.
                  Miller Thunderbolt
                  Smith Oxyacetylene Torch
                  Miller Dynasty 200DX
                  Lincoln SP-250 MIG Welder
                  Lincoln LE 31 MP
                  Lincoln 210 MP
                  Clausing/Colchester 15" Lathe
                  16" DuAll Saw
                  15" Drill Press
                  7" x 9" Swivel Head Horizontal Band Saw
                  20 Ton Arbor Press
                  Bridgeport

                  Comment


                  • #10
                    You 're welcome, the user will be so happy, he'll probably try to abuse it right away.

                    Comment


                    • #11
                      A member on a forum made the comment; "If you build it idiot proof, they'll just make a better idiot." Elsewhere the line; "These people could break cannon balls."

                      I work often in a plant where breakage seems to exceed the outer limits of human stupidity. IE; driving a forklift into a box semi, and trying to stack pallets two high, hanging heavy duct by tying with wire to 1/2" EMT carrying 480Volt three phase. Forgetting to grease a motor bearing for a long time, so making up for lost time, and putting in a whole tube, or, most frequently, driving a fully extended forklift through an overhead door that is partly open. Making your own cartridge fuses out of plumbing pipe and being proud. The maintenance man, a long term employee, who is well informed about the electrical system, called to ask if it was OK for him to hook up a 240 volt three phase motor in the maintenance shop, (this facility has NO 240 three phase anywhere on 40 acres!)
                      Dynasty 280DX
                      Bobcat 250
                      MM252
                      Spool gun
                      Twentieth Century 295
                      Twentieth Century 295 AC
                      Marquette spot welder
                      Smith torches

                      Comment


                      • #12
                        Pallet Jack Repair

                        Yeper WillieB those are good clients !! They have a way to keep a welder busy. Can always count on them for work in the slow times.

                        Comment


                        • #13
                          The arms and rollers arrived in a few days. I was able to install them without difficulty. Notice the wear on the flattened bushing.
                          Attached Files
                          Miller Thunderbolt
                          Smith Oxyacetylene Torch
                          Miller Dynasty 200DX
                          Lincoln SP-250 MIG Welder
                          Lincoln LE 31 MP
                          Lincoln 210 MP
                          Clausing/Colchester 15" Lathe
                          16" DuAll Saw
                          15" Drill Press
                          7" x 9" Swivel Head Horizontal Band Saw
                          20 Ton Arbor Press
                          Bridgeport

                          Comment

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