[Kevin Thorp]

Originally Posted by Drivencrazy

Just a word of caution: An input torque on the "output" shaft can cause a significant amount of stress in the gearbox casing leading to cracking.

For instance someone pushing you from the front or rear would create a reactionary torque in the wheel. Which would then get transmitted through the gears and into the worm gear shaft which would press against the plastic housing of the gearbox.

We sourced some of these from Torque Trans for the 2011 season and had a similar issue arise several times.

Yes, Team 342 had a couple Nordex gearbox failures using 12" wheels. This adds tremendous stress to the gearbox housing during pushing & abrupt stops.

Team 3489 has used them for 3 years, with no failures:
2014: Two worm gearboxes driving four wheels: two 6" Omnis and two 6" HiGrip
2015: Four worm gearboxes driving four 6" Mecanums
2016: Four worm gearboxes driving four 8" pneumatic wheels & six 4" Colsons.