Hello RFS and all

This is an XC - and as Gadge suggested, there may be a difference between
the XC 5244 and the XC 52144. It would be a minor difference, I think.
The Model 53 is the Auto Drive; the Model 52 is the Gearbox Drive.
Both have steering wheels. Tiller steering stopped with the Model 51.

We have a Parts Manual and an Operator Manual for the XC.
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/7306/Rover_Ride_On_Information.html#Post7306
[This is a subscription page)

The secondary chain is adjusted by moving the whole sub-frame forward or rearwards.
The easiest way to do this is via rear wheel removal.

Hope this helps.
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Jack