Hi Ian,
I haven't had a look at one of these Rovers but it was a similar setup to Greenfield.
There were adjustments in the last manuals I posted starting with https ,but this section Events - Past & Present
is the wrong part to post on so links won't work and images can't be posted here.
The right place is Forums Repairs and Maintenance Questions On Ride On Mowers Questions on Rover Ride On Mower
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/120994/rover-rancher-28166-auto-drive.html#Post120994
In this part of the forum to get the links to work you need to high light the whole link then right click on the link and select open
in new tab. , or just copy the link and paste it into the address bar.
Neutral:
When the foot pedal is in neutral, the friction drive disc is not in contact with either of the two pulleys on the drive axle. The drive belt from the engine is still spinning the friction drive disc, but no power is being transferred to the wheels.
Forward:
When you press the toe of the foot pedal:
The pedal system moves the friction drive disc into direct contact with one of the two pulleys on the drive axle.
This pulley is set up to spin the drive axle in the forward direction when driven by the friction disc.
The further you press the pedal, the harder the friction disc is pressed against the pulley, increasing the engagement and thus the speed (and torque) in the forward direction.
Reverse:
When you press the heel of the foot pedal:
The pedal system moves the friction drive disc away from the forward pulley and into contact with the other pulley on the drive axle.
This "reverse" pulley is designed such that when the friction disc engages it, it causes the drive axle to spin in the opposite direction
In the manual there is an Auto belt tension adjustment so I can't see why a tight belt would stop reverse working when
it needs the belt tension for forward and reverse.
Cheers
Max.