Mrgoodwrench35
RCTalk Addict
I've had this weird problem with my Xmaxx for a while now and can't seem to figure out the cause. Been ongoing for months and it's starting to drive me a little nutty. I'm a master technician by trade and have a pretty good understanding of all things mechanical (or so I thought) but this is kicking my butt.
My problem is that when I set the gear mesh by adjusting motor position on my M2C mount, the mesh changes as I roll the motor. Gets tighter and looser with rotation.
I first noticed this after I jumped about 10 ft in the air (pretty tame in comparison to some of the jumps it's lived through) and landed in what I thought was a soft grassy field. Turns out, covered up by the grass was a very large rock which I landed perfectly on top of. The impact damaged the rear bulkhead, more specifically, the section that houses the center diff.
After the impact, I drive off, everything seems fine other than an odd sound. Turns out the sound was a piece of the damaged bulkhead rubbing on the center diff teeth where the bulkhead was pushed into it on impact.
I replaced the rear bulkhead with a new Traxxas part, reassemble, and find this gear mesh issue I described above. I assume something else bent on impact, tear back down to inspect and see nothing wrong.
I've since replaced the spur assembly, kush drive shaft and all, rear diff, center diff, and last night tried a different motor to no avail. Mesh still changes with rotation. Judging by the frequency of change with rotation, the problem seems to be in the center diff area as the rate of change matches up to center diff rotation.
Forgot to mention I've also replaced center drive shaft assembly with M2C 2 piece shaft. There is a good amount of flex room in this center drive shaft setup so I'm certain that the issue isn't coming from the front diff.
I'm running out of ideas. Anyone have any input? I can provide pics or video although I'm not sure that would help.
My problem is that when I set the gear mesh by adjusting motor position on my M2C mount, the mesh changes as I roll the motor. Gets tighter and looser with rotation.
I first noticed this after I jumped about 10 ft in the air (pretty tame in comparison to some of the jumps it's lived through) and landed in what I thought was a soft grassy field. Turns out, covered up by the grass was a very large rock which I landed perfectly on top of. The impact damaged the rear bulkhead, more specifically, the section that houses the center diff.
After the impact, I drive off, everything seems fine other than an odd sound. Turns out the sound was a piece of the damaged bulkhead rubbing on the center diff teeth where the bulkhead was pushed into it on impact.
I replaced the rear bulkhead with a new Traxxas part, reassemble, and find this gear mesh issue I described above. I assume something else bent on impact, tear back down to inspect and see nothing wrong.
I've since replaced the spur assembly, kush drive shaft and all, rear diff, center diff, and last night tried a different motor to no avail. Mesh still changes with rotation. Judging by the frequency of change with rotation, the problem seems to be in the center diff area as the rate of change matches up to center diff rotation.
Forgot to mention I've also replaced center drive shaft assembly with M2C 2 piece shaft. There is a good amount of flex room in this center drive shaft setup so I'm certain that the issue isn't coming from the front diff.
I'm running out of ideas. Anyone have any input? I can provide pics or video although I'm not sure that would help.