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Lt.Doomsday

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i took out the Maximum ST today and was running it around in the field by my house

all the sudden i hit a hidden bump in the field and the car stopped dead.the motor is running but i hit the throttle and it's not going.

i run over to it and pop the body.their is a tooth missing from the Spur Gear.

stupid plastic gears.i don't know what to do now,i want to get a metal one but i don't know if it's a 1 or 2 speed.how could i tell?

the LHS isn't opened on monday and who knows how long it would take to get it.guess it will be sitting downstairs for awhile
 
if it is a 2 speed it will have two spurs(one a little bigger than they other).That is all i can tell ya
 
Pic
Spur.JPG
 
I am sure that someone out ther makes a steel spur gear. If it wasn't plastic than you would be stripping clutch bells right and left. Count your blessings it didn't get into something worse. Seems to me that the spur grea has done it's job. Probably had a rock get inbetween the clutch bell and spur.
 
so,it's a 2 speed then?

on tower hobby i found the parts number for the metal spur gear.it's acutally an upgrade for the ST,but comes on the MT model stock.i wouldn't be suprised if a rock got lodged in there.instead of putting down salt when it snowed up here,they put gravel on the road.

i'll call the LHS and see if they have it in stock,along with a rechargeable glow starter with a meter.
 
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No that is a one speed for sure. Yeah you may want to look into a hardened clutch bell if you are going to get a metal spur though. Again you will be ripping up your clutch bells. It is also going to be more important than ever to get the gear mesh right.
 
Yes when you put the engine up to the spur gear. Ya know when you match up the clutch bell to the spur gear. Seems like you have had it right thus far but ya never know when it will be wrong. A lot of guys use a plastic parts bag that will come with parts from the LHS to get it right. Or running a thin piece of paper to make sure it's right.
 
i'm learning stuff everyday about this R/C car yet get stumped by what you meant. :LoL:

my dad thought he could get it running with a tooth missing."it'll run,but skip".

he tightens the screws more and puts it back down on all 4 wheels.then i rolled it across the worktable and it stopped dead,then he said "ok,guess that's not an option"

the list of parts so far:
52T Metal Spur Gear
15T Heavy-Duty Clutch Bell
Rechargeable Glow Starter w/ Meter
 
When you run metal on metal, both better be hardened. I learned this the hard way. Look for a thread called "realistic RPMs on a picco 26". Essentially I put an HPI 18t CB on my picco 26, then dropped that in a lightning buggy. Within 3 tanks the CB was toast. the HPI CB's are designed to be meshed with the composite spurs, not hardened metal ones. The spur ate the CB real fast. I got pic in that thread of the carnage.

The mesh is real important whether you're running metal on metal, or metal on plastic. I usually mesh mine by feel. I get the mount bolts snug, then back off a hair so I can gently slide the engine back and forth. Then I check the mesh by holding the spur and clicking the CB back and forth. I like to have a hair of lash (free space between the teeth), but not too much (excessive lash). If the mesh is too tigh, you'll know it. Don't try to get it so there's no lash, and no bind, that's bad too. A very small ammount of lash is ok. I also use the mounting slots in the chassis to get the engine in line with the spur (parrallel axis), then once the mesh has been set, carefully snug the bolts. when they're snug, check the lash. If it hasn't changed, snug the bolts some more and check it again. Once this is done, fully tighten the bolts and you're done. Check the mesh one more time on the bench. Roll the truck back and forth and listen for anything other than smooth gear sounds.

I just don't like the paper trick, but that's just me. the important thing is get the mesh right, or you're CB and spur will suffer.
 
I typically do mine by feel as well. Hasn't failed me yet. I would always suggest for a newbie to get a piece of paper until they get comfortable with doing it though.
 
Here is how I set my mesh:
"From another SkyMaxx post"

Setting gear mesh is very important to the longevity of both gears and the components driving and being driven by the gears.

Here's how to do the mesh check.
1. Loosen the screws that hold the motor mounts to the chassis plate (don't take them all the way out).

2. Make sure you have both spur gear and clutch gear on properly (since you've mounted the spur and the clutch is attached to the motor, you probably have little to worry about here).

3. Take the plastic bag that the spur gear came in (a ziploc bag will work just as well) and place one thickness of the plastic between the two gears.

4. Push the motor back into place so that the two gear compress on the plastic.

5. Tighten the motor mount screws (making sure that the motor mounts are as square to the chassis as possible...you want the gears to have as even a surface to surface contact as possible).

6. Pull the bag out. The gears should rotate freely and mesh together just right.

Hope this helps...
Click to expand...

You can substitute a sheet of paper for the plastic bag, but I find that the plastic works much better and provides a more reliable mesh. Just my method.
 
i got the parts and with help from my dad,got it running now.the new rechargeable glow starter i got the car started after 2 pulls.
 
Originally posted by newnitrofan
No that is a one speed for sure. Yeah you may want to look into a hardened clutch bell if you are going to get a metal spur though. Again you will be ripping up your clutch bells. It is also going to be more important than ever to get the gear mesh right.
Click to expand...

Robinson Racing (RR) makes a combo of steel spur gear and hardened clutch bell....I use the combo on my RC10GT.
 
well,i took it out today for a longer run today and sheared half the teeth off the new spur gear and f-ed the clutch bell good.

i did the bag thing and their was no problems.i let it idle and then ran it in my driveway and up to the end of my fence and it was all chewed up.

now,i gotta another clutch bell and Spur gears{maybe 2} in case this happens again.
 
Perhaps you have your slipper mechanism too tight. After setting the mesh, try loosening the slipper mechanism a little. Allow it to slip some and the strain on the spur might be relieved.
 

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