Arty,

these are a fairly simple mower so before you dismantle anything take a number of photos so you can go back to if you forget how the part was before dismantling.

For instance when working on the chain system it is easy to forget which side the tensioner mounts etc so lots of photos and you should not have any problems, for instance to remove the engine on the light you can take the two bolts from the engine mounts, or you can take off a nut from one end of the two rods that run across the mower and pull the rods out, when doing this there are a number of lengths of pipe and washers which will fall off as the rod comes out, again photos, photos.

Beech.