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General Bobcat Skidsteer Forum
Bucket Cylinder Pin Repair
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<blockquote data-quote="SkidRoe" data-source="post: 61541" data-attributes="member: 3290"><p>Continued the repair yesterday. After seeing how oblong the hole in the cylinder rod was and how much slop there was in the bobtach pivot pins, I picked up a new set of pins and bought some oilite bronze bushings. As I stated earlier, Bobcat did not see the 440b worthy of putting in bushings on any of the bucket pivots from the factory, so I made my own.</p><p>The bobtach came off without too much drama, other that the head of one of the pin bolts had rusted round (thanks to many years of a bovine fecal marinade), so I drilled it out. Cylinder was removed too.</p><p><img src="http://i851.photobucket.com/albums/ab73/SkidRoe/1fd200a61343cba6e6cf47be574c06a7.jpg?t=1356107489" alt="" class="fr-fic fr-dii fr-draggable " style="width: 620px; height: 465px" /></p><p>The pivot holes were worn about 1/16"evenly, so rather than boring them, they were reamed with a 1-1/8" reamer. It was easier to do them in the lathe, clamping the bobtach to the tool post and supporting the opposite end with a 1" drill in the tailstock.</p><p><img src="http://i851.photobucket.com/albums/ab73/SkidRoe/a4253cb0441388a4bbbc70bb33e23661.jpg?t=1356107487" alt="" class="fr-fic fr-dii fr-draggable " style="width: 620px; height: 465px" /></p><p><img src="http://i851.photobucket.com/albums/ab73/SkidRoe/e847383300370a673489a2c20ff278e1.jpg?t=1356107493" alt="" class="fr-fic fr-dii fr-draggable " style="width: 620px; height: 465px" /></p><p>Here is an action shot:</p><p><a href="http://s851.photobucket.com/albums/ab73/SkidRoe/?action=view&current=e4ad3cf0860fa4b9399d16c54cbc6920.mp4" target="_blank">http://s851.photobucket.com/albums/ab73/SkidRoe/?action=view&current=e4ad3cf0860fa4b9399d16c54cbc6920.mp4</a></p><p>I did the cylinder with the same reamer, but set it up in the mill.</p><p><img src="http://i851.photobucket.com/albums/ab73/SkidRoe/4e7719e96c13387370e741dc4b1f7700.jpg?t=1356107490" alt="" class="fr-fic fr-dii fr-draggable " style="width: 620px; height: 826px" /></p><p>The bushings I bought were 1-1/4" OD, so they were turned to provide a 2 thou interference fit to the reamed bores. The installed bushings were then reamed to provide 3 thou of clearance to the pins for grease.</p><p>While the bobtach was off, I replaced the slider blocks for the locking pins. This design of bobtach is unique to the 453 and older 4xx and 3xx machines, and has square pins that engage horizontally.</p><p>I painted the bobtach while it was off, as it was pretty rusty. Re-assembled it this morning, every thing is snug and tight, just like it should be. Hopefully good for another 20 years.</p></blockquote><p></p>
[QUOTE="SkidRoe, post: 61541, member: 3290"] Continued the repair yesterday. After seeing how oblong the hole in the cylinder rod was and how much slop there was in the bobtach pivot pins, I picked up a new set of pins and bought some oilite bronze bushings. As I stated earlier, Bobcat did not see the 440b worthy of putting in bushings on any of the bucket pivots from the factory, so I made my own. The bobtach came off without too much drama, other that the head of one of the pin bolts had rusted round (thanks to many years of a bovine fecal marinade), so I drilled it out. Cylinder was removed too. [IMG width="620px" height="465px"]http://i851.photobucket.com/albums/ab73/SkidRoe/1fd200a61343cba6e6cf47be574c06a7.jpg?t=1356107489[/IMG] The pivot holes were worn about 1/16“evenly, so rather than boring them, they were reamed with a 1-1/8“ reamer. It was easier to do them in the lathe, clamping the bobtach to the tool post and supporting the opposite end with a 1“ drill in the tailstock. [IMG width="620px" height="465px"]http://i851.photobucket.com/albums/ab73/SkidRoe/a4253cb0441388a4bbbc70bb33e23661.jpg?t=1356107487[/IMG] [IMG width="620px" height="465px"]http://i851.photobucket.com/albums/ab73/SkidRoe/e847383300370a673489a2c20ff278e1.jpg?t=1356107493[/IMG] Here is an action shot: [URL]http://s851.photobucket.com/albums/ab73/SkidRoe/?action=view¤t=e4ad3cf0860fa4b9399d16c54cbc6920.mp4[/URL] I did the cylinder with the same reamer, but set it up in the mill. [IMG width="620px" height="826px"]http://i851.photobucket.com/albums/ab73/SkidRoe/4e7719e96c13387370e741dc4b1f7700.jpg?t=1356107490[/IMG] The bushings I bought were 1-1/4” OD, so they were turned to provide a 2 thou interference fit to the reamed bores. The installed bushings were then reamed to provide 3 thou of clearance to the pins for grease. While the bobtach was off, I replaced the slider blocks for the locking pins. This design of bobtach is unique to the 453 and older 4xx and 3xx machines, and has square pins that engage horizontally. I painted the bobtach while it was off, as it was pretty rusty. Re-assembled it this morning, every thing is snug and tight, just like it should be. Hopefully good for another 20 years. [/QUOTE]
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