Hi yong2579, sorry to hear about the issues your having with your Abrams. The only way your going to be able to fix this problem is to replace the entire gearbox. Out of the 3 years that we sold VsTank’s, we have come across 5 tanks (07 MCU) that had issues that you are describing. Each time we replaced the gearbox for the customer and that solved the issue 100% of the time.

Each time this happened I personal took apart the gearbox to see what the issue may be. All 5 times there were no signs of damage that would cause this issue. One time I added some plastic lubricant to the plastic gears to help with friction and this helped, but this only helped once out of the 5 gearboxes tested. Another time there was a soldering issue to one of the motors. It looked like the wires were soldered on correctly, but looks can be deceiving. After re-soldering the connection, this solved the issue entirely. The other 3 gearboxes I couldn’t explain the cause of the issue.

With what was said above, VS has made many changes to their tanks over the past year. So this could be an entirely new issue that I haven’t come across like a voltage issue to the motors from the main board. Back in late 2010, we received a bad batch of Abrams with major MCU board issues. It’s just a good thing because in early 2010 we started tested ever tank that we received from VS or this would have been a very costly issue on our part.

I feel bad for your distributor because it sounds like he received a bad batch of Abrams with gearbox issues. Unfortunately I know how he must feel!

Please keep us posted on this issue