The gear drive machine will have its break point or weak point outside the machine in the flex head. This means if you hit a bolt in the ground or worse the flex head will break if the impact is bad enough to break it. This puts the break outside of the machine and leaves you with a 20 minute repair to the flex head. In fact we have never lost a gear drive machine to hitting an object in the floor.
Our current range of gear machines models have never had an internal gear break down in NZ, ever!! for the five years that we have been distributing them.
There have been belt machines that lost a belt right at the World of Concrete show after only a few hours of light use on a demo slab. Belts will break at some point from 100-300 hours, not maybe, but will break.
We have never lost a steel gear in any machine we have sold, ever...
Sometimes after a few years a machine will need some ball bearings replaced (this is true of belt drive machines too) but again we have some models that have never had a rebuild either, ever!!
The proof is really in the warranty offered with the machine, the belt machines warranty does not cover the belts (Called a wear item) so the warranty is really only on the frame, trim and electrical system. Our all gear drive machines have a 100% bumper to bumper warranty with 5 years warranty on the gearbox alone!!
Would you put up with a belt in your gearbox of your truck?, just like a car the break point should be were the rubber meets the road, not an internal break point.