The drive dogs are two different threads, so look at which way the dog is driving the wheel and uou will have to undo them in the same direction as they are driving otherwise you will be trying to tighten them up.
I have just uploaded parts list for the self Propelled side catcher models to the parts list and manuels area.
Regards,
Bruce
Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.