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Losi Baja Rey 1/10th 4WD RTR desert truck

TheLetterJ said:
Maybe a silly question, but... did you have any problems with the stock ones?
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Yeah the plastic around the rods ends stretched from quite an extreme tumble and the ball came lose and would fall out so they were replaced with aluminium trailing arms from rc4wd and they snapped at the thread end of the rod end so now Iv replaced them with the HR trailing arms which I'm very happy with and are a solid construction [emoji106]


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Like the Yeti that breaks Revo type ends easily, you need captive ends like the VP trailing arms which don't break. This style seems to last forever. Not sure why Losi didn't just make a VP style version.
 
mewalsh100 said:
Anyone else having trouble with the Losi Aluminum lower trailing arms? Specifically, the plastic rod ends? Seems like every 3rd time I take the truck out I break one off. Thinking about just going back to the stock plastic units at this point:(
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Yup. Same thing happened to me on the first run w the aluminum. Switched to some Traxxas rod ends that are stronger (allegedly) and I have yet to break another one. So might look there. TRX 5347 is the part number.
 
Last edited:
Ya those are revo rod ends, much stronger. If you break those, rpm makes an identical replacement rod end that are beefier and stronger.
 
Ugggh. Just got everything back together and one pack in more grinding noises. Get hard on the gas and the noise escalates with very little forward movement. I love this truck when it's running, but I have to say it's been a bit of a maintenance nightmare. :(
 
So, I have been through the front diff, center diff and can't see any obvious culprit. I also checked all the bearings, none were grenaded and they all felt smooth. I then checked the ring and pinion in the Currie rear end and it also looked great. I have no clue at this point. Anyone have any suggestions? :cry:
 
mewalsh100 said:
Ugggh. Just got everything back together and one pack in more grinding noises. Get hard on the gas and the noise escalates with very little forward movement. I love this truck when it's running, but I have to say it's been a bit of a maintenance nightmare. :(
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Pack your bearings, a few post back is a picture for example. When breaking down to do maintenance you need to look over every single bearing you are running across. Make sure you roll the bearings in your hand and listen for grinding noises or interrupted movements. Remove race/ clean/ pack with grease/ and reinstall. You will thank me later! Truck is a beast!! Just need to figure out the quirks of it. Takes time.
 
mewalsh100 said:
So, I have been through the front diff, center diff and can't see any obvious culprit. I also checked all the bearings, none were grenaded and they all felt smooth. I then checked the ring and pinion in the Currie rear end and it also looked great. I have no clue at this point. Anyone have any suggestions? :cry:
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Spin the drivetrain by hand, spin the rear driveshaft paying close attention to the feel and sounds it makes. Spin the rear tires, spin each front. On a stand of coarse, than run the truck on a stand still and see if you can make out what it is.
 
mewalsh100 said:
Ugggh. Just got everything back together and one pack in more grinding noises. Get hard on the gas and the noise escalates with very little forward movement. I love this truck when it's running, but I have to say it's been a bit of a maintenance nightmare. :(
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Iv heard of the front housing deforming under load from its poor design this may account for the grinding noises when under acceleration but when taken apart nothing is visible !


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Ok - So I've done all the above. Thanks for the suggestions. In an effort to narrow down or isolate the problem, I disengaged Front Drive by just dropping the center drive shaft out. As I mentioned before, everything spins freely by hand, inspection of gears and bearings show no issues. Now, upon attempting to run with front drive disengaged, the motor spools up and it makes kind of a shrill noise but goes virtually nowhere, which is what was happening before. I checked the pinion on the motor and it is locked down and fully engaging, so it's not pinion spinning on motor. The bearings, pinion and spur in the Currie rear also looked great. I'm assuming it has to be something in the center diff, but again, I don't see any bugaboos when I visually inspect it. With the motor out, I did notice that I can very easily spin the center diff by rotating the rear drive shaft and keeping my finger on the Spur gear that the motor pinion engages. When I say easy, I mean easy. (I've been running grease versus diff fluid in it). This has worked great and I've done it since I got the truck early this year. I'm wondering though if it's causing some issues now? My only other thought was to temporarily put a locker in the center diff and see what happens. Any other ideas?
 
Have you tried powering the motor up in the hand and listening to it on its own ?

I have seen the washers that cover the "o" ring at either end of the diff deform which could cause slippage ,

I think trying the locker may help again isolate where the noise is coming from a cheap is locker is blue tack if you don't have an actual locker

fbd6fcc29702201a18d80d018493e05b.jpg


You can clearly see that the one washers has become concaved ,

Also look at the rear drive shaft , the plastic splines can also wear away over time

When applying power what's is exactly moving and what isn't ?

Check the transmission case , Iv also heard of the plastic wearing away directly behind where the spur gear engages into a housing ,



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If you pull the front driveshaft doesn't the centre diff just diff out if you try to move it with the motor? A diff always sends drive to the side with least resistance unfortunately.

You'd need the locker to send power to the rear to test it in that configuration.
 
CoolRunning said:
If you pull the front driveshaft doesn't the centre diff just diff out if you try to move it with the motor? A diff always sends drive to the side with least resistance unfortunately.

You'd need the locker to send power to the rear to test it in that configuration.
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I think it is diff'ing out without the driveshaft. I'm going to try the locker and see what it does. Just trying to isolate that god awful noise. I've literally had everything torn apart, visually inspected it all, checked all the bearings, etc. Feel like I'm chasing my own tail. I'll post when I eventually find the problem. Sucks 'cause my backyard track is completely dialed right now! :x
 
willyg1981 said:
Have you tried powering the motor up in the hand and listening to it on its own ?

I have seen the washers that cover the "o" ring at either end of the diff deform which could cause slippage ,

I think trying the locker may help again isolate where the noise is coming from a cheap is locker is blue tack if you don't have an actual locker

fbd6fcc29702201a18d80d018493e05b.jpg


You can clearly see that the one washers has become concaved ,

Also look at the rear drive shaft , the plastic splines can also wear away over time

When applying power what's is exactly moving and what isn't ?

Check the transmission case , Iv also heard of the plastic wearing away directly behind where the spur gear engages into a housing ,



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Click to expand...

Ok, so I definitely have the concaved washer going on in the front diff. Center diff everything looks great. I'll replace the front diff parts and see what that gets me. Thanks to everyone for all the feedback!"thumbsup"
 
willyg1981 said:
Don't forget to upgrade the washers with these
6f22e74623b9af927991bdcdc132e4b1.jpg

[emoji106]


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Click to expand...

Awesome - I'll order some up. I ordered all new parts for front and center diff. I'll get those washers on the way as well."thumbsup" I did have some laying around in my parts bin, and was able to use one of those to get everything back together. I then filled center diff with 30k diff fluid. She's "alive" again!

Appreciate the insights and info from everyone!:)
 
mewalsh100 said:
Awesome - I'll order some up. I ordered all new parts for front and center diff. I'll get those washers on the way as well."thumbsup" I did have some laying around in my parts bin, and was able to use one of those to get everything back together. I then filled center diff with 30k diff fluid. She's "alive" again!



Appreciate the insights and info from everyone!:)
Click to expand...



Glad it's back on the dirt or at least soon to be mate [emoji106]


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