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Old 11-02-2008, 06:09 PM   #1
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Default SLOW XXX-T!!!!!!

I have a xxx-t the problem is the last two times the track the truck seems kind of slow. I was using a Komodo 19t and now a Novak 10.5 but the speed is no different. Last time I raced it seemed slow and the diff was loose. But after it was tightened still seemed slow.
Today I used a Novak 10.5 and it still seemed slower than it use to and the truck seems louder inthe trans area. I even tried a 5400 lipo and geared it down and still was not a whole lot faster. Does it seem it is time to rebuild the trans and diff or should I check something else.
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Old 11-02-2008, 06:56 PM   #2
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Yes. It sounds like you melted your diff gaer. I would take a look at it and the rest of the tranny gears. Hope this helps.
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Old 11-02-2008, 07:09 PM   #3
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You never want to run a loose diff as the center will melt from the heat from slipping .
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Old 11-02-2008, 07:12 PM   #4
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sounds like your diff melted down. i hate the diffs on xxx-t i had one always burned up on me.
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Old 11-02-2008, 09:33 PM   #5
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Certainly sounds like a diff problem, just ensue your slipper is adjusted properly as well. Get back to us on how you go.
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Old 11-03-2008, 06:44 AM   #6
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Quote:
Originally Posted by bigsquidracer View Post
sounds like your diff melted down. i hate the diffs on xxx-t i had one always burned up on me.
Did you maintain the diff and check it once and a while ? Seems like a lot of people on RC Tech have problems with Losi diffs
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Old 11-03-2008, 07:37 AM   #7
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check the pins in the rear hubs too, had that happen to my XXX4. if the pin falls out you can tighten the wheel up just enough to get drive, but if you get on it, it will slip.
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Old 11-03-2008, 07:56 AM   #8
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Quote:
Originally Posted by way2fast4u View Post
check the pins in the rear hubs too, had that happen to my XXX4. if the pin falls out you can tighten the wheel up just enough to get drive, but if you get on it, it will slip.
You can also snip part of a thick body clip for a emergency pin as well in a pinch...
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Old 11-03-2008, 08:22 AM   #9
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yes, did that body pins work better than roll pins, you can cut them to the correct length to fit the wheel.
i meant to say if the pin falls out and you don't notice when you put the wheel on, mine snapped off inside the axle not fun in a race.
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Old 11-03-2008, 01:19 PM   #10
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Be sure to check and clean the bearings in the tranny and the rear hubs as well.
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Old 11-03-2008, 05:06 PM   #11
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Default diff

ok so here is what I found when opening the tranny and diff. Super dirty. The diff gear seemed fine but where the balls are was like enging sludge, the large bearings around the diff are all gritty and sloppy, bearings in general are awful dirty. The gears seemed fine though. I have never rebuilt the diff. MY BAD!!! Lesson learned. Also the diff screw gaskets are also crappy. What parts will I need and is there a article on how to do it.
Also is this what made the car seem so slow even or could it be something else. The diff did not spin freely for a second when I spun it.
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Old 11-05-2008, 08:38 AM   #12
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Drag from your trans bearings will definitely limit your top end and puts a lot of strain on the motor and speedo.

Here is the parts explosion for the XXX-T trans
http://www.losi.com/ProdInfo/Files/l...ansmission.pdf

Here's an incomplete but helpful set of Losi diff tips from Adam Drake
http://wwnh.net/content/view/34/2
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Old 11-05-2008, 08:45 AM   #13
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i would check the speedo control setting,sounds also like it could be reset and adjusted..
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