As Jonathan has said, worth keeping the 'Zebedee' factor at bay when removing it !.
Struggling to locate any info on the Canadian Kohler Serial number. U.S serial numbers appear to start with a Letter, then 6 digits ?.
The Spec nbr is listed as supplied to Howard Rotovators, so maybe S1g (Gareth) can shed some light on it when he's back on here?.
In the meantime, here's an exploded view of the constituent parts to check for any you maybe missing-