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Old 09-20-2004, 06:47 AM   #1
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Default HPI Nitro MT keeps losing dogbones... Help!

Hey all,

I am a relative newbie and I have worked through several problems with my truck (built from a kit), but this one has me stumped.

Recently I have started losing the left front dogbone. It comes out of the 'cup' and gets wedged in the wheel assembly and brings the truck to a screeching left turn halt. This has happened three times. The last time I lost the right front dogbone completely after the left one came out. I looked at the cup to see if it was deformed in anyway, but it seemed ok. Is there some adjustment where I can make them tighter?

All help appreciated.

Kram
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Old 09-20-2004, 07:06 AM   #2
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Thats the one problem with dogbones.....they have a tendency to fall out. See if you can get a small spring to fit inside the outdrive half in the wheel and the transmission. Then install the dogbone back in. The spring will kind of force the shaft in the center.
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Old 09-20-2004, 12:05 PM   #3
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If you can't find a spring for it, you can use two pieces of fuel tubing. These will wedge on either side of the dogbone and help keep the dogbone in place. Another thing you need to do is make sure your ride height is correct so that at rest, all 4 dogbones are level with the ground. This will help you out quite a bit more.
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Old 09-20-2004, 12:58 PM   #4
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This should solve your problem:

http://www2.towerhobbies.com/cgi-bin...?&I=LXVJ90&P=7

HTH, Jim.
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Old 09-21-2004, 03:50 PM   #5
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I have a HPI MT and used to have the exact same problem.

The best solution I have found are these:



http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXN166

Stick one or 2 (depending on how much play there is) in the differential cup. Should solve ALL you problems. I like them much better than the spring idea because they are kinda "slippery" and absorb a lot of vibration.


A funny thing is this quote from tower's site.
"These are the replacement outdrives for the Rush
Located inside the front differential"
Last time I checked the Rush didn't have a front diff.
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Old 09-22-2004, 05:21 AM   #6
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Default Thanks!

Hey all,

Thanks for the replies. Like a dork, I did not wait to see the replies before hitting tower hobbies and buying stuff. All of the ideas here were cheaper than the one I came up with. I bought a 'shiny CVD kit" instead

http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXAW78

Hopefully this is still a solution to the problem albeit an expensive one ($32). But I love buying new parts at tower hobbies so if it works I will still be happy

Thanks again!

Kram
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Old 09-22-2004, 08:16 PM   #7
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ebay's cheaper, but since you already bought them it doesn't matter.
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Old 09-22-2004, 09:47 PM   #8
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the CVDs will reduce some slop and overall will be much more manageable. not a bad upgrade to get at all, even if it was just to solve a problem
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