Joe Tosh Posted October 10, 2012 Share Posted October 10, 2012 (edited) I got this happening last time I went out on the beach with the Traxxas Summit. The pin connecting the half shafts to the front axles pops out. Put everything back together but it happened again on the next run after 5 min. Why is this happening? Never happened before in 2 years time. Can anyone help? Edited October 10, 2012 by Joe Tosh Quote Link to comment Share on other sites More sharing options...
suicideneil Posted October 11, 2012 Share Posted October 11, 2012 Can anyone help? Too much torque and too soft plastic = it stretches a little and the pin pops out. You could replace the shaft / that end of it ( if you can find the separate parts in the UK ), or maybe swap to the erevo shafts & tweak the lengths ( one is shorter at each end of the truck ). I doubt a ziptie would work to hold anything in place- do you drive with the diffs locked when this happens?.. Quote Link to comment Share on other sites More sharing options...
Joe Tosh Posted October 12, 2012 Author Share Posted October 12, 2012 Too much torque and too soft plastic = it stretches a little and the pin pops out. You could replace the shaft / that end of it ( if you can find the separate parts in the UK ), or maybe swap to the erevo shafts & tweak the lengths ( one is shorter at each end of the truck ). I doubt a ziptie would work to hold anything in place- do you drive with the diffs locked when this happens?.. Hmm, good question. I was indeed driving it full speed (BL on 4S) with the front diff locked, although I didn't know that. I must have pushed the switch accidentally and not notice. Do you think that might have caused it? I usually only lock diffs when I'm crawling, not in high gear. The next ride (after I put it back together) was even shorter. Diffs were not locked and the pin popped out after a few minutes of bashing. I must say that, when putting it back together, it was kind of loose, no snug fit really. It got me wondering how on earth that pin would stay in when driving... So I guess the half shafts are just worn now? Do they have CVD's for the Summit? Thanks for your help! Quote Link to comment Share on other sites More sharing options...
Sharkfat78 Posted October 12, 2012 Share Posted October 12, 2012 Wont these fit? http://www.modelsport.co.uk/index.php?product_id=28040 Cheaper on the bay though Quote Link to comment Share on other sites More sharing options...
suicideneil Posted October 12, 2012 Share Posted October 12, 2012 Hmm, good question. I was indeed driving it full speed (BL on 4S) with the front diff locked, although I didn't know that. I must have pushed the switch accidentally and not notice. Do you think that might have caused it? I usually only lock diffs when I'm crawling, not in high gear. The next ride (after I put it back together) was even shorter. Diffs were not locked and the pin popped out after a few minutes of bashing. I must say that, when putting it back together, it was kind of loose, no snug fit really. It got me wondering how on earth that pin would stay in when driving... So I guess the half shafts are just worn now? Do they have CVD's for the Summit? Thanks for your help! Ah, another guy who runs BL in the Summit; buy an erevo for BL, keep the summit for slow driving! But yeah, sounds exactly like the joint / hole got stretched and now the pin will just keep popping out. Traxxas doesn't sell cvds for the 4 corners, just the centre shafts ( that thought crossed my mind- they would need to make/sell 2 different lengths vs a single length that fits all 4 corners so not worth the hassle for traxxas ), however MIP do sell cvds for all for corners ( universal style slider shafts ): http://www.ebay.co.uk/itm/NEW-MIP-CVD-Spline-Kit-Traxxas-Summit-9168-NIB-/390461232478?pt=Radio_Control_Parts_Accessories&hash=item5ae94d955e several sellers if you do a quick search for 'traxxas summit cvds'. Might be worth a go, if not replace with another stock shaft... 1 Quote Link to comment Share on other sites More sharing options...
suicideneil Posted October 12, 2012 Share Posted October 12, 2012 Wont these fit? http://www.modelspor...roduct_id=28040 Cheaper on the bay though No, because the summit uses 2 different length drive shafts at each end of the truck, due to the diff being wider on one side for the locking mechanism = shorter drive shaft on one side. The revo cvds will only fit one side, and are very likely to keep popping out of the drive cup due to the extreme articulation/ suspension travel of the summit too. 1 Quote Link to comment Share on other sites More sharing options...
Joe Tosh Posted October 13, 2012 Author Share Posted October 13, 2012 Ah, another guy who runs BL in the Summit; buy an erevo for BL, keep the summit for slow driving! But yeah, sounds exactly like the joint / hole got stretched and now the pin will just keep popping out. Traxxas doesn't sell cvds for the 4 corners, just the centre shafts ( that thought crossed my mind- they would need to make/sell 2 different lengths vs a single length that fits all 4 corners so not worth the hassle for traxxas ), however MIP do sell cvds for all for corners ( universal style slider shafts ): http://www.ebay.co.u...=item5ae94d955e several sellers if you do a quick search for 'traxxas summit cvds'. Might be worth a go, if not replace with another stock shaft... I know, but the Summit is just awesome on BL It then just becomes the ultimate fun truck! And I've never liked the looks of the erevo, looks too squashed. I've got to say, I'm not a brainless basher, apart from 2 front bumpers, this is the first breakage in 2 years time. Gonna try the MIP CVD's then, thanks for help! Quote Link to comment Share on other sites More sharing options...
suicideneil Posted October 13, 2012 Share Posted October 13, 2012 I know, but the Summit is just awesome on BL It then just becomes the ultimate fun truck! And I've never liked the looks of the erevo, looks too squashed. I've got to say, I'm not a brainless basher, apart from 2 front bumpers, this is the first breakage in 2 years time. Gonna try the MIP CVD's then, thanks for help! Fair-dos. Most guys ( traxxas forum... ) stick the MMM or similar BL systems into the Summit and then drive it like an erevo, so it's little wonder so many of those kinda guys strip diffs and driveshafts constantly, no points for guessing what the common bit of 'advice' is that they receive 2 years with no real breakage is impressive driving & care for sure Quote Link to comment Share on other sites More sharing options...
Joe Tosh Posted October 13, 2012 Author Share Posted October 13, 2012 (edited) Fair-dos. Most guys ( traxxas forum... ) stick the MMM or similar BL systems into the Summit and then drive it like an erevo, so it's little wonder so many of those kinda guys strip diffs and driveshafts constantly, no points for guessing what the common bit of 'advice' is that they receive 2 years with no real breakage is impressive driving & care for sure Know what you mean. I'm pretty cautious with it. I won't drive it on 6S either, I want to keep it alive I do jump it however, and it's easier to control mid air on BL. Edited October 13, 2012 by Joe Tosh Quote Link to comment Share on other sites More sharing options...
richarddenton1982 Posted October 13, 2012 Share Posted October 13, 2012 When the pin gets loose remove the half shaft, rotate 90 degrees and drill new holes. Problem solved for a while. Provided you use the right sized drill bit! Quote Link to comment Share on other sites More sharing options...
Joe Tosh Posted October 13, 2012 Author Share Posted October 13, 2012 When the pin gets loose remove the half shaft, rotate 90 degrees and drill new holes. Problem solved for a while. Provided you use the right sized drill bit! Not a bad idea, I'm gonna try it. Do you know the drill size? Quote Link to comment Share on other sites More sharing options...
richarddenton1982 Posted October 13, 2012 Share Posted October 13, 2012 Think its only 2mm. Check first just to be sure! I did this with my Summit when i first got it. I was donutting and broke the pin out of the shaft. Drilling works just fine, but the holes need to be diametrically opposite. If they're not then they'll shake to bits pretty quickly. Quote Link to comment Share on other sites More sharing options...
suicideneil Posted October 13, 2012 Share Posted October 13, 2012 I forgot about that trick, nice catch... Quote Link to comment Share on other sites More sharing options...
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