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General Bobcat Skidsteer Forum
853 gear reduction mayhem
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<blockquote data-quote="Old_853" data-source="post: 134550" data-attributes="member: 24634"><p>Got both rebuilt and back in. I had to pull the drive gear on the left side to get it back in there. I don't remember how I got it out, but it's pretty tight even with the gear removed. Both left and right sides had gnarfed gears, as well as the craigslist find. Must be why bobcat got away from the design and parts are unobtanium. I cobbled together the least borked sets out of three, and might try to weld and recut the spare set if/when the current ones grenade. I tried ordering the primary shaft from a 743. Close, but no cigar. Everything is the same except the drive motor input. It may be possible to swap drive guts with a 743 motor into an 853, but the shaft is much smaller. The large secondary gear is the same part number between the two. The 743 takes 80 series chain, and the 853 takes 100HS chain, so you can't swap the entire gear box easily. Eh. I think the easiest thing would be to delete the entire gear box and fit a more modern drive unit, although you would lose brakes without some hillbilly engineering. Also did axle bearings and seals, and rebuilt the drive motors while I was in there. Next is bushings all around for the bobtach/rams. The neverending project. </p><p>[ATTACH=full]6510[/ATTACH][ATTACH=full]6511[/ATTACH]</p></blockquote><p></p>
[QUOTE="Old_853, post: 134550, member: 24634"] Got both rebuilt and back in. I had to pull the drive gear on the left side to get it back in there. I don't remember how I got it out, but it's pretty tight even with the gear removed. Both left and right sides had gnarfed gears, as well as the craigslist find. Must be why bobcat got away from the design and parts are unobtanium. I cobbled together the least borked sets out of three, and might try to weld and recut the spare set if/when the current ones grenade. I tried ordering the primary shaft from a 743. Close, but no cigar. Everything is the same except the drive motor input. It may be possible to swap drive guts with a 743 motor into an 853, but the shaft is much smaller. The large secondary gear is the same part number between the two. The 743 takes 80 series chain, and the 853 takes 100HS chain, so you can't swap the entire gear box easily. Eh. I think the easiest thing would be to delete the entire gear box and fit a more modern drive unit, although you would lose brakes without some hillbilly engineering. Also did axle bearings and seals, and rebuilt the drive motors while I was in there. Next is bushings all around for the bobtach/rams. The neverending project. [ATTACH type="full"]6510[/ATTACH][ATTACH type="full"]6511[/ATTACH] [/QUOTE]
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853 gear reduction mayhem
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