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Bombi and / or BR100 Track adjustment; How tight, and Side to side
Topic Started: Mar 28 2018, 05:37 AM (489 Views)
JVMunson
Advanced Operator
[ *  *  * ]
We have a debate in our club on how tight to tighten the tracks on our Bombi and our BR100. Both have winter tracks on them and have a mixture of original Bombi Tires, foam filled implement tires, and Urethane tires.

One thought is you tighten the track until an air filled tire starts to dent BUT that doesn't hold up when you use Foam or Urethane Tires. What then?

Secondly, is the side to side adjustment. We never paid much attention to this until this year - trying to make sure the dimensions from the center of the second to last wheel to the rear turn wheels centers are the same. BUT when we do that, one track is looser than the other. Then we are back to the first item I mentioned We could use some answers...

Recently, the BR100, which, had a red urethane sprocket. sheared off a tooth. Sprocket had less than 50 hours on it and the machine was just running down the trail. Looking at it, showed a bunch of small cracks at the base of the remaining teeth. Thoughts/theories on what caused this failure?

Thanks in advance.
Joel
Edited by JVMunson, Mar 28 2018, 05:39 AM.
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Red130
Member
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Was that sprocket new or had it been in storage for many years? If fairly new I would speak with the molder. They don't crack that easily when new. For track tightness on your particular machines maybe post here : Forum Snowcats
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selnoil
Advanced Operator
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JV,

Our club recently sold our 3rd Bombi. Track tension is tough because I don't think it's the same for every machine. case and point with the 2 we still have. One machine has to be run pretty tight or it pops a track while the other runs better a bit looser. One key is that the tension wheels in the back have to be relatively the same distance back. I like to measure from the center of the front sprocket just because that is a fixed point on both sides. The wheels have rubber torsioners so can be in a little different spot on each side. If one side is lets say an inch off that will cause the track on one side to want to come off. If they are back nearly the same then that should prevent any type of angle of the wheel to cause it to blow a track. Now with that said the rear wheel on the Bombi take a ton of stress from the drag weight with the turning so it's not difficult to bend a spindle which we have done. If your spindles are straight then the distance back from the sprocket is pretty important. Back to tension, generally if you can easily pick the track up in the center if the machine 6-8" you should be good. Once I have it where I think it's good I will run them forward and back a few times then have someone watch as I put a load on the sprocket. the track will rotate around the cog and want to roll around it a little. You don't want the track to bunch up to much between the cog and front wheel if the track is to loose. They shouldn't be super super tight or it will bend things when snow builds up, but to loose is not good either. Another indicator that the track is to loose is when your going down hill the track will jump the cog teeth, not good!!

Regarding the cog chewing up, that could be several things but a track to tight will not help that situation any. Believe it or not the tracks will build up some snow or ice which does tighten them a little. We only had trouble with the rubber cogs but never with the hard ones. I would say that the track is way to tight, the cog has lost it's integrity if old, or did the cleats or rubber get changed?? To have a tooth break off hints to an integrity problem is my first guess.

We run a mix of foam filled and hard rubber from Alpine on ours. Foam filled in the rear because we found the hard rubber from Alpine in the rear caused a lot of serious issues.

Hope some of this helps??

Mike
Windham, ME

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JVMunson
Advanced Operator
[ *  *  * ]
selnoil
May 20 2018, 02:33 PM
JV,

Our club recently sold our 3rd Bombi. Track tension is tough because I don't think it's the same for every machine. case and point with the 2 we still have. One machine has to be run pretty tight or it pops a track while the other runs better a bit looser. One key is that the tension wheels in the back have to be relatively the same distance back. I like to measure from the center of the front sprocket just because that is a fixed point on both sides. The wheels have rubber torsioners so can be in a little different spot on each side. If one side is lets say an inch off that will cause the track on one side to want to come off. If they are back nearly the same then that should prevent any type of angle of the wheel to cause it to blow a track. Now with that said the rear wheel on the Bombi take a ton of stress from the drag weight with the turning so it's not difficult to bend a spindle which we have done. If your spindles are straight then the distance back from the sprocket is pretty important. Back to tension, generally if you can easily pick the track up in the center if the machine 6-8" you should be good. Once I have it where I think it's good I will run them forward and back a few times then have someone watch as I put a load on the sprocket. the track will rotate around the cog and want to roll around it a little. You don't want the track to bunch up to much between the cog and front wheel if the track is to loose. They shouldn't be super super tight or it will bend things when snow builds up, but to loose is not good either. Another indicator that the track is to loose is when your going down hill the track will jump the cog teeth, not good!!

Regarding the cog chewing up, that could be several things but a track to tight will not help that situation any. Believe it or not the tracks will build up some snow or ice which does tighten them a little. We only had trouble with the rubber cogs but never with the hard ones. I would say that the track is way to tight, the cog has lost it's integrity if old, or did the cleats or rubber get changed?? To have a tooth break off hints to an integrity problem is my first guess.

We run a mix of foam filled and hard rubber from Alpine on ours. Foam filled in the rear because we found the hard rubber from Alpine in the rear caused a lot of serious issues.

Hope some of this helps??

Mike
Windham, ME

Many thanks for taking the time to write up your experiences!
You gave me several possibilities to look at and I appreciate your time.
Summer is in full swing but I will look for the items you mentioned in the fall when we start getting the equipment ready.
Thank you!
Joel
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JVMunson
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Red130
Apr 8 2018, 10:43 AM
Was that sprocket new or had it been in storage for many years? If fairly new I would speak with the molder. They don't crack that easily when new. For track tightness on your particular machines maybe post here : Forum Snowcats
It was only a couple of years old. I ordered it when we put new groussers on the machine.
Joel
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