Forums
New posts
Search forums
What's new
New posts
New media
New media comments
New profile posts
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Visit our tractor and agricultural equipment communities:
Ingersoll Forum
Case IH Forum
Combine Forum
Hay Forum
JCB Forum
John Deere Forum
Kubota Forum
Mahindra Forum
Massey Ferguson Talk
New Holland Forum
Valtra Forum
Yanmar Forum
Zetor Forum
Farming Forum
Forums
Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
743 Chaincase Rebuild and Swap
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support SkidSteer Forum:
Message
<blockquote data-quote="thetool" data-source="post: 19071" data-attributes="member: 1534"><p>Well, I've rebuilt a few chaincases, but it's been a while. I am stiff and sore. And that's a good tip about standing it on end, never thought of that. Didn't have much in the way of lifting on this job, but I'll remember that if I'm ever crazy enough to do this again any time soon...=).</p><p>The reason I went for this chaincase is because it had be worked before, the gaskets looked relatively new, it was bone dry on the outside, and when I opened it, the chains looked pretty new and the oil was clean.</p><p><img src="http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743chaicase002.jpg?t=1225319346" alt="743chaicase002.jpg picture by tooleeo" class="fr-fic fr-dii fr-draggable " style="width: 320px; height: 212px" /></p><p>I figured drain the oil and clean it out, change out the axle seals and gearbox seals and cover gasket, fill 'er up and call it good.</p><p><a href="https://www.skidsteerforum.com/skid2/javascript:void(0);" target="_blank"><img src="http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743chaicase009.jpg?t=1225319759" alt="743chaicase009.jpg picture by tooleeo" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p>We started in the back, but here we are breaking loose the sprocket bolt with a bar through the studs, box-end wrench on the bolt.</p><p>After we got all the guts out except for the front chains, we ladled and suction all the old oil out, tipped it front down and let it set overnight, then finished wipe-up the next day before reassembly.</p><p>One of my rear outside bearings came apart on removal, I decided to replace all four rear cone bearings. Axles were already sleeved.</p><p><img src="http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743chaicase007.jpg?t=1225320149" alt="743chaicase007.jpg picture by tooleeo" class="fr-fic fr-dii fr-draggable " style="width: 320px; height: 212px" /></p><p>Remove the axle/hub with a porta-power.</p><p><img src="http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743005.jpg?t=1225320296" alt="743005.jpg picture by tooleeo" class="fr-fic fr-dii fr-draggable " style="width: 320px; height: 212px" /></p><p>This is looking back into the rear axles, so the left side here is actually the right side of the machine, already finished. All chains are set on the sprocket, the axle is pushed in just enough to grab the bearing. I put some sticky grease on the cone to help keep it in place, it likes to slide out and fall to the bottom of the chaincase when you're trying to catch splines. Makes me cuss.</p><p><img src="http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743002.jpg?t=1225320534" alt="743002.jpg picture by tooleeo" class="fr-fic fr-dii fr-draggable " style="width: 320px; height: 212px" /></p><p>Seal installer in place, permatex around the outside of the seal, a little grease on the bearing to help it along until it gets washed in oil. I like to get it as straight as I can with a jack under the hub to help me catch splines squarely inside.</p><p><img src="http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743chaicase005.jpg?t=1225320687" alt="743chaicase005.jpg picture by tooleeo" class="fr-fic fr-dii fr-draggable " style="width: 320px; height: 212px" /></p><p>When you catch splines, very light taps with a hammer on the hub will drive the axle into the sprocket. You can feel it movving in with a finger in the hole where the bolt goes. Don't get crazy with the hammer, or you'll have it apart again filing burrs on the splines. When you can start the bolt, do so. Put a wrench on it and turn the hub until your seal comes up against the axle tube. Make sure it starts squarely into the tube, THEN have at it with the hammer. I had access to the special installers, but Tazza's idea with the split cone race and hose clamp is outstanding. Oh yeah, when you start wailing on it with the hammer, your wrench falls off. Put it back on and finish snugging up the bolt to bottom out the bearings. I also failed to mention that on my broken bearing, the inner race was cracked, so I use it as an installer for the outer bearings, driven on after the seal is installed. Shoulda took a pic of that....=).</p><p>Anyway, that was the axle seals. I also drained and cleaned the gearboxes, and changes those seals. I'll post more later.</p></blockquote><p></p>
[QUOTE="thetool, post: 19071, member: 1534"] Well, I've rebuilt a few chaincases, but it's been a while. I am stiff and sore. And that's a good tip about standing it on end, never thought of that. Didn't have much in the way of lifting on this job, but I'll remember that if I'm ever crazy enough to do this again any time soon...=). The reason I went for this chaincase is because it had be worked before, the gaskets looked relatively new, it was bone dry on the outside, and when I opened it, the chains looked pretty new and the oil was clean. [IMG width="320px" height="212px" alt="743chaicase002.jpg picture by tooleeo"]http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743chaicase002.jpg?t=1225319346[/IMG] I figured drain the oil and clean it out, change out the axle seals and gearbox seals and cover gasket, fill 'er up and call it good. [URL='https://www.skidsteerforum.com/skid2/javascript:void(0);'][IMG alt="743chaicase009.jpg picture by tooleeo"]http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743chaicase009.jpg?t=1225319759[/IMG][/URL] We started in the back, but here we are breaking loose the sprocket bolt with a bar through the studs, box-end wrench on the bolt. After we got all the guts out except for the front chains, we ladled and suction all the old oil out, tipped it front down and let it set overnight, then finished wipe-up the next day before reassembly. One of my rear outside bearings came apart on removal, I decided to replace all four rear cone bearings. Axles were already sleeved. [IMG width="320px" height="212px" alt="743chaicase007.jpg picture by tooleeo"]http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743chaicase007.jpg?t=1225320149[/IMG] Remove the axle/hub with a porta-power. [IMG width="320px" height="212px" alt="743005.jpg picture by tooleeo"]http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743005.jpg?t=1225320296[/IMG] This is looking back into the rear axles, so the left side here is actually the right side of the machine, already finished. All chains are set on the sprocket, the axle is pushed in just enough to grab the bearing. I put some sticky grease on the cone to help keep it in place, it likes to slide out and fall to the bottom of the chaincase when you're trying to catch splines. Makes me cuss. [IMG width="320px" height="212px" alt="743002.jpg picture by tooleeo"]http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743002.jpg?t=1225320534[/IMG] Seal installer in place, permatex around the outside of the seal, a little grease on the bearing to help it along until it gets washed in oil. I like to get it as straight as I can with a jack under the hub to help me catch splines squarely inside. [IMG width="320px" height="212px" alt="743chaicase005.jpg picture by tooleeo"]http://i295.photobucket.com/albums/mm136/tooleeo/chaincase/743chaicase005.jpg?t=1225320687[/IMG] When you catch splines, very light taps with a hammer on the hub will drive the axle into the sprocket. You can feel it movving in with a finger in the hole where the bolt goes. Don't get crazy with the hammer, or you'll have it apart again filing burrs on the splines. When you can start the bolt, do so. Put a wrench on it and turn the hub until your seal comes up against the axle tube. Make sure it starts squarely into the tube, THEN have at it with the hammer. I had access to the special installers, but Tazza's idea with the split cone race and hose clamp is outstanding. Oh yeah, when you start wailing on it with the hammer, your wrench falls off. Put it back on and finish snugging up the bolt to bottom out the bearings. I also failed to mention that on my broken bearing, the inner race was cracked, so I use it as an installer for the outer bearings, driven on after the seal is installed. Shoulda took a pic of that....=). Anyway, that was the axle seals. I also drained and cleaned the gearboxes, and changes those seals. I'll post more later. [/QUOTE]
Verification
Post reply
Forums
Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
743 Chaincase Rebuild and Swap
Top
