Lawnmower Solution: Converting to a solid rear axle

Lawnmower Solution: Converting to a solid rear axle

Jan 14, 2022

Marc Tobel

The racing and parade Mower James and I have been working on for the past couple months has had some issues during testing.  Due to our design goal of it to be quick in the turns and be able to tow a substantial amount, we decided to work with the hydrostatic transmission that came with the mower.  This turned out to be one of the key faults in our design as it started to show signs of failure very early on during our tests.


The hydrostatic transmission was not able to take the power and rpm we were giving it through our longer gear ratio and new V-twin engine.  Because of this we were not even able to move much faster than our original mower configuration, and we could audibly hear the stress the transaxle was going through.  At this point it was not safe to operate the mower due to an increased chance of the transmission failing spectacularly under our backsides.  James and I decided to retire the mower temporarily and do research for a solid axle conversion with a peerless transmission.  This would allow us to have a more reliable drivetrain as well as smoother power delivery from the engine to the rear wheels. 


Converting to a solid rear axle will also allow us to choose more suitable rear wheels and tires for cornering, as the standard lawn mower wheels and tires might not be able to take the increased lateral load at higher speeds where we intend to be running this machine for most of the time.  We are also able to install a hydraulic brake system easily due to hubs that are available for mounting the rear rotor onto the axle.  This will allow for reliable stopping power and will make fabrication of the caliper mounts much easier.  


The major components we are using to do this conversion can be found below:






Axle component kit:


Rear wheel hubs:


Rear tires:


We have a couple spare rear sprockets in the workshop we are going to use but here's one that is similar to the one we are using: