Help me!
 

I have recently installed a novak havoc bruchless system into my car, but there has been a few problems. Once installed after about ten minutes of steady running it, the plastic spur gear attached to the motor has worn down. The gear had no wearings before so must be the motor. This is unbelievable. Is there a metal hop up as i dont want to be changing the gear every ten minutes! help please write back asaphttp://forum.racing-cars.com/smileys/smiley1.gif

no motor will kill a spur only 2-3 things will do that, bad meshing between spur and pinion most likely case to loose,and or dirt getting into ether of them

Have you checked the bearings that support the slipper shaft, you could have one missing or one that has failed.

What model is it?

James.

What do you mean attached to the motor?

The model is a havoc, novak 8.5 t motor

I dont think the bearing will be a problem considering that it is brand new and i have never used it before until now.

and i mean the spur gear the one which is directly touching the spur gear on the motor

Just because it is brand new doesn't mean you can't get a dodgy bearing in the kit, it does happen. Have you checked that the mesh between the spur gear and the pinion isn't too tight? Also have you used the correct pitch pinion for the spur gear?

Like Bigred said aswell, is there any dirt getting into the gears?

its a schumacher cat sx 2 pro
and ok fair enough
also it should have been fine as i took it to a shop so that i could get it done properly and i had a losi motor and that was dosgy so he got the credit back for that and fitted me this one. He is a dealer so i persume that he will know what he is doing

just because he is a dealer doesn't mean he knows your car or how best to fit things.

what surface are you running on? is it a heavy dirt environment where something could have got in between the gears?
What motor wear you running before?

I was running a losi brushless system ( the cheep one £130 ) he fitted also. Last night when I did it it was road only so I dont see that any much could have affected it

this is what it looked like this is what its like now (look at attachments) also this is my car

hard to say really but pinion is off centre, and on the spur every other tooth is missing so looks to me like there has been a stone and something that has got in to the pinion,

and just noticed on pic two that the spur gear is off centre you can see more of the slipper pad on one side than the other

What do I need to do with it then?

replace spur gear and mesh them together properly, and make sure pinion as no foreign objects in between the teeth, and check for play in gearbox/ lay shaft bearings,

"check for play in gearbox/ lay shaft bearings, what do you mean sorry i am a obviously new to this

grab hold of the lay shaft with your fingers and see if you can move it up down side to side, there should be no sings of movement or play at all,get hold of someone at your local club that has run one for a while and ask them to show you

if you mean the pin comming out of the motor there is no movment it is solid appart from obviously it can spin .

you need to look through the manual, the motor has nothing to do with the gearbox, the layshaft is what the big black cog is on

oh my bad i know what you mean, that i had a few problems whith when i built it. it wabbles a little but not too much.

I think its a combo of the slipper pads not being "keyed" into both sides of the spur properly and it being set to loose... A loose slipper will over heat the plastic and and allow teeth to come off.


I have never had the need for alloy or steel spur gears for any of my race cars/trucks in my 23years in the hobby.

May just be an oversight, but shouldn't the slipper spring be at the other end of the layshaft (refer to the first image upload). I always have the spring in the dust cover at the other end, and just a washer and a nut on the the slipper pad end.

Are you sure that the centre of the spur hasn't melted?

I have seen it before where the slipper is not tight enough and it melts the centre of the spur and allows it to move around on the output shaft, which strips the teeth.

Check the play in the layshaft bearings! If you have a little play in the bearings then when your car/chassis flexes it moves the meshing slightly and sometimes is just enough to pull a tooth off, then that results in the spur itself stripping. Plus looking at picture 1, your meshing does look loose!

Also just a tip, those shocks are wound WAY too high....

Look at my shock collars compared to yours...

I will change the shocks thanks for the advice, and yes it has not melted everything apart from the spikes are still in tack

Well it's either your meshing that wasn't correct to begin with then or your motor has moved.

may be the meshing i did not check it before i ran it as i trusted it would be fine , but i will tighten up all of the screws arround the motor just incase when i fit the new part

Personally, looking at your photos....

The first pic of the losi motor looks fine, and the pinion looks to be a 48dp pitch (tooth size etc.)....

..the second pic, the pinion on your novak looks to be a more coarse pitch possibly a tamiya style .4 pitch. Which would explain why it has done it and why it seems to have actually removed every other tooth rather than just stripping/melting like we do at races.

Get a new 'spur' ( the large gear) and get a new pinion (the small one) and make sure they give a 48dp pinion (around a 23tooth). then all should be fine.

I agree the pinion looks a little large. I found the schumacher hardened alloy pinions are real good for the price.

Will 20 t be ok for small cog

what size spur gear is it ?

83t I think

with an 83 tooth spur gear I run a 48dp 23 tooth pinion and never had any problems, providing you mesh it up correctly you shouldn't either :)

How long should each turn buckle be and should the wheels be tilted in or our?

as stated earlier, the slipper adjusting nut/spring is on the wrong side! it should be on the side furthest from the spur, not next to it. This could be causing the spur to move around too much.

The slipper adjusting nut is NOT on the wrong side!

The reason the nut is on this side is because he has the upgraded layshaft and pinion! This is more reliable than it being on the other side and running the old layshaft!