Pinion Gear Slipping
#1
Pinion Gear Slipping
My pinion gear keeps coming loose and I would like some ideas on how to keep it set. I've tried blue and even red locker on the grub screw but it will still move forward after a bit. Any suggestions? Let me know if any further info is needed. Thanks in advance.
#2
Is the flat spot on the motor shaft rounded out?
Have you tried to make it tighter with a quality hex tool, not the L shape tool that comes with most RTR kits?
Is there any unnormal vibration in the motor/trans area that could be loosening the grub screw?
Have you tried to make it tighter with a quality hex tool, not the L shape tool that comes with most RTR kits?
Is there any unnormal vibration in the motor/trans area that could be loosening the grub screw?
#3
I've read of people putting locker on the motor shaft and the pinion itself to help hold it. Is that a good idea?
#5
The bottom of the grub screw almost looks a bit rounded. I think I'll try to flatten it a bit and then go from there.
#6
I'm willing to bet if you get in there with a good hex tool and torque it down your problem will go away.
#7
Tech Fanatic
iTrader: (9)
OP, I had the same exact issues with Blitz when I installed a Tekin system in it. Couldn't finish more than a few laps in a race because the pinion would never hold on.
I was using L-wrenches since 2002. They always worked well enough on nitro for me so I didn't think anything else of it. As it turns out, quality hex tools are finished to much better tolerances that you need in order to get just the right amount of torque on the pinion. Another racer saw my issue, lended me his hex tool, and the problem went away.
..I bought a whole set of hex tools the very next day.
Mine aren't a very high quality, but they get the job done. I bought a set of Dynamite tools. I'm not sure how I got by without this type of tool before. I hardly ever touch L-wrenches anymore.
#8
I'm going to pick up a good set of hex tools in the next couple days. In the meantime, I thought about how the grub screw is rounded on the bottom and decided to keep it that way and mill a divot into the motor shaft. This motor is dedicated to this truck so I felt ok doing it. I used my milling bits and my benchtop drill and put a nice little divot in there. The grub screw sits down in there nice and I put on some red locker. I'll see what happens once that's dried.