I'm trying to replace the bearing on an RNS1078C. How do you remove the auger assembly to replace the bearing?
Manitowoc didn't write a step-by-step procedure for doing that. For that matter, such intensively detailed instructions aren't commonly provided by many manufacturers. Therefore, technicians must often rely on their own judgement and experience before proceeding into unfamiliar territory. Calling tech support isn't out of the question.
If I was the technician first encountering that task, I'd generally refer to a parts breakdown since the illustrated parts are often numbered in the order which they are removed or installed.
During the disassembly process, I would be inspecting parts I've removed for wear or damage. Most importantly, I'd perform a close visual inspection of the evaporator's inner wall to look for scratches caused by contact with either the auger or from the grit of lime scale. If such damage is evident, then the evaporator and the auger will need replaced too.
If you're extremely lucky, then that's NOT the case. Therefore, to rebuild the auger's installation, I recommend replacing every single part that has anything to do with keeping that auger tight, but turning freely and to keep water from leaking out. So...bearings, o-rings, seals, etc. Just take a look at the parts diagram, research the parts and you'll figure it out.
Hopefully the gearmotor assembly comes out of this unscathed.
Here are links to the manuals on that machine:
Manitowoc Ice RNS1078C Parts & Manuals - Nugget Ice Machine
FWIW: Lack of proper cleaning at prescribed intervals is the most common cause of ice machine failure. This ESPECIALLY true of nugget/flake machines due to their extremely close mechanical tolerances between moving parts within the evaporator assembly. UNFORTUNATELY, the often neglected "descaling" part of a proper cleaning can lead to some VERY expensive repairs.
Ectofix has provided some very good points on this. But first, I have to ask if you hold a EPA refrigeration license to work on this and own the required recover equipment, torches, vacuum pump, micron gauge, gauges, tubing equipment, silver braze, refrigerant, hand tools, and nitrogen for purging and brazing.. The reason I ask this is you will have to remove the evaporator to get to the lower drive coupling and seal from the machine before you can remove the auger. The coupling is almost always frozen to the shaft. And the allen screw a bit difficult.. There simply just isn't enough flex in the tubing to safely raise the evaporator off the mount without damage. You can not replace the lower seal without removal to be able to clean it.
Most times that a nugget machine get's to this point, The drive motor has had some water damage as well as the evaporator chamber and auger. Usually it means that the machine has reached it's lifespan and needs a new head.
Open the top and remove the top bearing. with a good light check the interior of the evaporator chamber for any scores or scratches. Also look at the auger for damage. If there is no damage, then you may want to consider a repair. But if there is, scrap it. Been down that road once before.
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