We occasionally have Z-turns brought in to our service department at MT&T for “no movement” Lets take a few minutes and discuss the system and the probable issues.
The drive system of any basic residential or commercial zero turn lawn mower consists of 2 separate transmission systems and a single belt system that drives both of them. The rear wheels are bolted to these transmissions and control forward-reverse and stopping.
The 2 most common issues I see are ” It only goes in 1 direction” OR “it won’t move at all” The latter is the easier to diagnose of the two. In 30 years of professional repair experience I have never known both transmissions to go out in the same way and at the same time. So, that only leaves the belt and pulley system that propels both transmissions, The one common denominator. Look for a broken belt, a spring or a belt tension issue.
When a machine only goes in one direction, or is slower on one side, I look at the transmission system on the side that is slow or non-functional.
Over the years I have witnessed that the right hand transmission is usually the issue. Why?…The mower deck discharge is almost always on the right hand side. So we find ourselves almost always turning left to get close to trees, foundations etc.. To turn left the right transmission must work harder and faster.
The causes of transmission issues are so varied that I won’t even attempt to list them all here. Most commonly though, the problem is an internal fluid pump failure.
BUT, over the years I have diagnosed and repaired issues as simple as….
- Low tire air pressure on the slow side.
- A worn drive belt that is too loose on the trans. farthest from the tensioner.
So before you fear the worst, cover all the basics.
Hope this helps! Until next time. Thanks for reading.