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Got some new spur gears... Don't wanna strip these too

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Austin2048

Austin2048

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I was using the same spur gear for my t maxx for almost 5 years till I finally stripped it. I got a new one and put it on my truck. I started it up and it was running fine. I put my truck in reverse and it kinda stripped my brand new gear. It still worked fine if I just went forward but last time I fired my engine up it revved very high and started taking off but I grabbed my truck and stopped the wheels and it stripped my new gear completely. I ordered 2 new spur gears online and before they come in I wanna know how to put it on the right way so I don't strip these new gears. Anyone know how to put a spur gear in a t maxx 2.5? Old style tranny
 
Take the old one off and replace it with the new one. Correct mesh is most likely your problem. You want as little slop as possible between the spur and the pinion, with no binding. All spurs are a little out of round. Just don't set it at one spot on the spur. Rotate it, making sure it doesn't get too loose or too tight. I like to barely snug the mounting screws down; just enough that you can't slide the engine by hand. Then adjust it by placing a rubber handled screw driver on the mount and tap it ever so easy with a small hammer. Once you like the mesh, you'll be able to turn the truck up on it's side and tighten the screws properly without loosing your setting. Remember to use blue locktite. You might want to pick up some new pegs, too.
 
Loosen the engine mounts, install the new spur gear, then put a strip of paper between the spur and the CB. Keeping the engine squared, press it tightly against the spur and lock it down. When you pull the strip of paper out it should look like an accordion.
Doing it this way guarantees the tightest fit with only the minimum slack needed for a proper mesh.
 
Well my friction pegs are only a few drives old so they are like brand new and I don't wanna buy more cuz I'm broke
 
+1 for paper method. IT SEEMS LOOSE but its actually correct.

I had a spur last forever..... but I switched to a smaller one for torque.... ruined it in a few tanks of gas. Put the old one back on..... ruined it in a few tanks of gas..... BOUGHT A METAL ONE!!! RUINED the bell gear!!!!

Repalced bell gear LEARNED PAPER METHOD..... no more problems. It SEEMS LOOSE but its right.
 
Any idea what caused your spur to fry in the first place? I've had spurs last many many gallons without issue. Heck, I still have one I ran in my savage for 10+ gallons laying around here somewhere.

The reason I mention it is because you could have cracked your engine mount causing it to not mesh properly or hold mesh properly. Also, how are your CB bearings? If they are worn they will cause mesh to get out of whack too.
 
My thoughts exactly. I never had a problem with spurs. Even running hot motors years ago before traxxas vehicles came with slippers. Can't say the same for the idler gears in those trannys! I have trx spurs layin' around that are 15 years old or better. When it comes to mesh, the paper method sounds best. I've never tried it. With mesh, it's either right or wrong. Do what works best for you.
 
I'd never deny that it sounds like fun. You know I'm gonna try it... My 2.5 has a hard enough time pulling itself around right now! Shotsky...
 
I'm just a noob, but I have been playing with the spur gear clearances and found the best advice online was as follows:-

Rolling a piece of printer paper through the gears should leave an accordion shape on the paper with rips (tears) at the peaks. Using a store receipt (thinner paper) will leave a neat accordion with no tears.

I now barely snug my engine mount with a store receipt between the clutch and spur. I pull on the receipt and snug the engine bolts when it's just right.


Seems to work great!
 

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