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D6B sprocket removal questions

D6B sprocket removal questions

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robclay
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Hi.  I'd like to replace the sprockets on my D6B.  It's become unusable from slipping and I almost threw a track the other day driving down at an angle into a creek.

The service manual has a giant spanner wrench that I can buy for $325-$400.  Which I might consider that, or I might build something.  The hydraulic puller though looks maybe out of my price range.

1. What do you all do for changing sprockets?  Do I get it all broke down and try to find a guy that will drive to my house and pop the sprocket off?  I'm also contemplating fabricating a puller from a 50ton porta power cylinder.

2. Also the book has options on sprocket part numbers.  Could anybody help me on what sprockets I should purchase?

Thanks
Robert
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Wed, May 17, 2023 8:23 AM
KingLuxor
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Hello,

I am just wrapping up rebuilding a final drive on my D6 8U. Long story but I had to swap the final drive cover from my 9U parts machine to the 8U since it was not useable due to the pinion bearing location being a half inch oversize. Thankfully we have the tools and materials we need to do this type of work. Never worked on a cat before.

Here are a few photos that show the puller, pusher, and wrench (on the ground by the sprocket) we made.
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Wed, May 17, 2023 9:02 AM
robclay
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Reply to KingLuxor:
Hello,

I am just wrapping up rebuilding a final drive on my D6 8U. Long story but I had to swap the final drive cover from my 9U parts machine to the 8U since it was not useable due to the pinion bearing location being a half inch oversize. Thankfully we have the tools and materials we need to do this type of work. Never worked on a cat before.

Here are a few photos that show the puller, pusher, and wrench (on the ground by the sprocket) we made.
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Very nice. I thought about the bottle jack, but I wasn't sure the whole assembly would come off. Thanks
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Wed, May 17, 2023 9:16 AM
Wombat
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Reply to robclay:
Very nice. I thought about the bottle jack, but I wasn't sure the whole assembly would come off. Thanks
You do not have to pull the sprockets to re rim them, buy new rings, cut out a section so that they will slip over the hub end whilst track fram still in place, cut off old rim and weld on new rim. Neil Packu has just done this on I think a traxcavator.

Wombat
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Wed, May 17, 2023 3:24 PM
seiscat
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Robert, Wombat is correct. Don't remove the sprocket to replace the drive rim. Also while shop built pullers can pull apart sprockets, most of them have no accurate way of displaying how much force is used during installation. Sprockets installed too loose or too tight can cause bad problems.
Craig
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Wed, May 17, 2023 8:08 PM
juiceman
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Reply to seiscat:
Robert, Wombat is correct. Don't remove the sprocket to replace the drive rim. Also while shop built pullers can pull apart sprockets, most of them have no accurate way of displaying how much force is used during installation. Sprockets installed too loose or too tight can cause bad problems.
Craig
If you decide to replace the entire sprocket, have someone with the proper tools do it. Safety first. As far as re-rimming one, that works too, just be sure to properly weld the spokes and keep things aligned, etc.
Best wishes on getting your project wrapped up. JM
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Wed, May 17, 2023 8:16 PM
neil
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Reply to Wombat:
You do not have to pull the sprockets to re rim them, buy new rings, cut out a section so that they will slip over the hub end whilst track fram still in place, cut off old rim and weld on new rim. Neil Packu has just done this on I think a traxcavator.

Wombat
Hi, yes, we just replaced both sprocket rims on a D4 7U Traxcavator without removing the sprocket. What we did is cut a 60 degree segment (anything less that about 135 degrees means that aligning the two pieces to reweld is easy) out of the new sprocket rim, cut off the old sprocket rim, and weld the new one in. You wouldn't know it if it weren't for the spoke to rim welds - sits perfectly and avoided a ton of extra labor and tools. Took the welder about 4-6 hours each rim. Second one went faster as he had it figured out. Probably could have been done faster but the guy was a perfectionist, and it shows.
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Wed, May 17, 2023 10:13 PM
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