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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
743 chain replacement, axle, bearing, and other questions.
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<blockquote data-quote="Fe Fanatic" data-source="post: 90546" data-attributes="member: 12765"><p>This is a learning curve for me. I am getting good advice from my local Bobcat parts guy and right now am waiting on parts to come in. So far what I have learned is the machine is rear heavy and I almost got hurt finding it out. I removed the bucket and raised the lift arm up and blocked it. I put the unit on jack stands and started the tear down. I removed the front panel with the control arms and put them aside. I removed the front top plate to the chain case but the back plate was pretty tight under the pump frame mount. I removed that mount and that allowed me to lift the rear plate up enough to clear the parking brake assembly. With that pump mount out I had plenty of room to access the chain and gears in the rear of the chain case. It will be a pain to reach but doable. It saves the process of removing the engine. Since the chain was broken and I had the unit up on stands I faced a dilemma of getting the axle bolt loose. I put a 1 1/8" box end wrench on the bolt and used a floor jack to turn the tire to loosen the bolt. I placed the jack under one of the tires lugs and jacked it up. The tire turned and the bolt came loose easily that way. The chain was wedged under the left rear chain and sprocket and it took some coaxing to get it out. That chain shows some mashed end links and I won't make a decision on its replacement until I remove it and check for stiffness or excess play. I plan to use the hydraulics to get the rest of the axle bolts out. The unit still runs and I didn't have to disconnect any hydraulics so I plan to start the motor and wedge the wrench on the bolts and use the drive motors to turn the gears and loosen the bolts. I do not plan to do this without someone there to help out in case of emergency. When I talk about the unit being rear heavy I had a incident while working on the motor. I removed the four tires and wheels and left the arm up in the raised position. Since I am waiting on parts I decided to change the engine oil. I had the back engine cover open and was fighting the drain hose coming from the bottom of the block (rusted and would not come loose). I pushed a little hard down on a wrench and the whole machine tilted backwards. I was running for my life at that point. The only thing that kept the machine from falling off the jack stands and landing on the concrete was the rear door. The machine came back and the door hit the concrete floor and stopped all movement. It took a floor jack to jack the machine back onto the front stands. Once the machine was stable again I placed jackstands under the rear pan to stop any future tipping. I seriously believe if that door had not stopped the movement I would have been pinned under the machine. Lesson well learned. I didn't think of taking any pictures but I will for future reference. I could not save the top plate gaskets so I ordered new gaskets also. I think that my biggest problem in reassembly will be reinstalling the axle seals. I cut a bearing race in half to try to drive them in but something tells me that it won't be that simple. That's why I made my first post hoping someone has already been here and done this. FWIW, on a side note I think I need to learn HTML to be able to format these posts into paragraphs.</p></blockquote><p></p>
[QUOTE="Fe Fanatic, post: 90546, member: 12765"] This is a learning curve for me. I am getting good advice from my local Bobcat parts guy and right now am waiting on parts to come in. So far what I have learned is the machine is rear heavy and I almost got hurt finding it out. I removed the bucket and raised the lift arm up and blocked it. I put the unit on jack stands and started the tear down. I removed the front panel with the control arms and put them aside. I removed the front top plate to the chain case but the back plate was pretty tight under the pump frame mount. I removed that mount and that allowed me to lift the rear plate up enough to clear the parking brake assembly. With that pump mount out I had plenty of room to access the chain and gears in the rear of the chain case. It will be a pain to reach but doable. It saves the process of removing the engine. Since the chain was broken and I had the unit up on stands I faced a dilemma of getting the axle bolt loose. I put a 1 1/8" box end wrench on the bolt and used a floor jack to turn the tire to loosen the bolt. I placed the jack under one of the tires lugs and jacked it up. The tire turned and the bolt came loose easily that way. The chain was wedged under the left rear chain and sprocket and it took some coaxing to get it out. That chain shows some mashed end links and I won't make a decision on its replacement until I remove it and check for stiffness or excess play. I plan to use the hydraulics to get the rest of the axle bolts out. The unit still runs and I didn't have to disconnect any hydraulics so I plan to start the motor and wedge the wrench on the bolts and use the drive motors to turn the gears and loosen the bolts. I do not plan to do this without someone there to help out in case of emergency. When I talk about the unit being rear heavy I had a incident while working on the motor. I removed the four tires and wheels and left the arm up in the raised position. Since I am waiting on parts I decided to change the engine oil. I had the back engine cover open and was fighting the drain hose coming from the bottom of the block (rusted and would not come loose). I pushed a little hard down on a wrench and the whole machine tilted backwards. I was running for my life at that point. The only thing that kept the machine from falling off the jack stands and landing on the concrete was the rear door. The machine came back and the door hit the concrete floor and stopped all movement. It took a floor jack to jack the machine back onto the front stands. Once the machine was stable again I placed jackstands under the rear pan to stop any future tipping. I seriously believe if that door had not stopped the movement I would have been pinned under the machine. Lesson well learned. I didn't think of taking any pictures but I will for future reference. I could not save the top plate gaskets so I ordered new gaskets also. I think that my biggest problem in reassembly will be reinstalling the axle seals. I cut a bearing race in half to try to drive them in but something tells me that it won't be that simple. That's why I made my first post hoping someone has already been here and done this. FWIW, on a side note I think I need to learn HTML to be able to format these posts into paragraphs. [/QUOTE]
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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
743 chain replacement, axle, bearing, and other questions.
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