Idears!!

[rcgaryrc]

Rite! i have a 3.3 that has just been a pain it keeps on shreading the spur gear, and my 2.5 killed its engine so i put the 3.3 engine in the 2.5 and i dont no what to do with my 3.3 now! do you recon that i should try a steel gear in the 3.3, I've took it all to bits and i can't find the problem it has been set up by an expert so it can't be a bad mesh?:\

 

[Lessen]

Upgrading the spur is a good move but I strongly recommend you also upgrade your CB to hardened steel. Traxxas CB's generally aren't strong enough to mesh with a steel spur.

 

[2revo1maxx]

Make sure the clutch bell and transmission input shaft bearing are all good, as well as the bushing and other slipper clutch parts. After that make sure the chassis isn't tweaked causing a mis-alignment of the two gears. The plastic should hold pretty good if all is done right. It is a t-maxx right?

 

[Metalhead Matt]

+1. If all the components involved are in good shape and the mesh is set correctly, the plastic should hold up just fine. Any slop or grit in the bearings means they need replaced.

 

[Jameswest21]

yea most def upgrade the spur gear....did it in mine and now its awesome

 

[olds97_lss]

What is happening to the spur? Teeth grinding off? Center melting out?

Common things that are missed are:
1) bent trans input shaft
2) bad trans input shaft bearings
3) bad cb bearings
4) cracked engine mount (easily overlooked)
5) stripped trans case mount bolt holes (allows for slop/movement when running)
6) bad mesh (I know you probably have that covered)
7) too tight of slipper
8) too high of expectations

Personally, I strip very very few spurs. The one on my savage had over 15 gallons run through it. It's all chipped up from rocks and whatnot, but I still have it somewhere.

Usually if I strip a spur, something is loose, bent, cracked or bearings are going bad.

 

[Metalhead Matt]

Exactly. Metal spurs mask problems. The problems they mask can lead to drag/bind in the driveline, causing more expensive, harder to fix problems.

 

[2revo1maxx]

My losi 454 is by far the most powerful mill in my collection, and that plastic spur running off it is the least of my worries. Same goes for my maxx with the picco 26, and my revo with the sirio 27. That 3.3 can't touch a properly aligned/meshed plastic spur.

 

[Metalhead Matt]

+1. Plastic spurs hold up just fine on my buddies Momba Maxx on 6s. With the slipper locked. His diffs are a different story. I don't think he's had a problem with diffs since he stuffed Robinson gears in em.