Hi Kempe, I have spoken to a Scott Bonnar repair expert this morning about removal of the nylon ring gear. This is his advice:
Once the plastic ring gear has cracked it is cactus and cannot be repaired or re-used. A steel drum ring gear for Models 430 and 590 Diplomat Scott Bonnar cylinder mower rear roller replacing the
nylon and alloy ring gears, should be purchased. The cost is $132.
To remove the stubborn existing gear, you carefully break it by any method you choose....drilling holes and breaking it in segments would suffice...just remove as much of the nylon as possible. The centre portion is on a key-way and his advice is to use heat, (oxy works fine) and pull it towards the camera in your pic.
Re: the bearings, after removal, just take them to any bearing supply company or perhaps purchase from the firm that will supply the replacement ring gear...they have them in stock.
Please let us know how you get on.
