ORIGINAL: Rev Devo
Haven't messed with RCs in a while and wow how things have changed. Anyways, i got this sweet new Caldera 10e and i'm still feeling it out but it seems to me there is a lot of play in the driveline. Can anyone tell me if this is normal for a brand new Caldera: I can hold all four tires stationary on the ground and rotate the spur gear about 6 teeth from one direction to the other. Seems like this is just asking for something to break every time i change direction/brake. There is a tiny bit of play in every joint but it seems most of it is in the diffs. Any thoughts? Do you think i should add some shims inside the diffs?
It can't hurt to shim the diffs for durability - but they're the same diffs used in Redcat 1/8th and 1/6th models, so they're pretty tough and understressed in 1/10th cars. I don't think it's anything to be concerned about. Also, most of the play probably isn't in the diff-pinion/diff-spur connection... on mine it's the dogbone/drive-cup connections. Each dogbone has 2 pins on the end, and they fit a bit loose in the drive cups... from the center spur to each wheel there's 3 drivecups that have to take up the slack of the pins spinning in them for the wheels to move - that's where all the play is.
Because the pins wear away at the the slots in the drive cups that play will get worse over time... but in reality your pinion can be spinning along at 30000+ RPM... so you won't notice how long it takes 6 teeth on your spur gear to fly by