Jump to content
Sign in to follow this  

Version 2 gear box building problems

Recommended Posts

So I started to build my own gearbox.

But some problems were founded.


After I assemble all the parts, I attached the gearbox with a 7.4v battery and mosfet.

When I pulled the trigger, I felt the motor vibrated a bit and the mosfet gave a "beep" sound to me.

But the piston didn't move.

I thought that maybe the motor is not strong enough. (It is a stock Kings arm motor)

So the mosfet active braking stopped to give power to the motor.


Then, I used a 11.1v lipo battery and tried again.

But once I pull the trigger, there was no "beep" sound for me.

Instead, the gear spun like crazy and immediately wore out the piston. (plastic piston)

And now the piston is locked.


It is the first time I build a gearbox. And most of the parts are stock/ made in China.

I shimmed the gear and they rotate quite well. It has a spring guide with ball bearings.


Is it because the spring is too strong for the motor?

Or is the spring too long so the piston cannot travel all the way back?


Thanks in advance for answering


Share this post

Link to post
Share on other sites

Take everything out excepr gears and piston. Close it up and see if the piston rolls easily on the gear. Sometimes pistons will have different spec than the gear teeth and will chew each other. Gnp and the white pistons did that to me once.

Edited by Automobilie

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Create New...