Grinding noise in the bottom end of Hoshizaki ice maker model DCM-270BAH
Ouch, that does not sound good. You have to determine if it is coming from the extruder or the gear reduction. Take a long screw driver and place it on the gear case with your ear on the end. Do the same on the lower halve of the extruder. One will be obviously louder and the source. If it has gone this far as to make noise, It will require a teardown. If the lower seal failed, you will have gotten water in the reduction gear case. That with time causes rust and bearing damage.. If the extruder bearings were not inspected annually with a .02 inch wire gauge, You may have auger interference with the evaporator. Damaging both.
This repair has to be done by a licensed refrigeration tech. From past experience, parts will be between $1500 and $2000. You may want to consider replacing it.
Fixbear is right, the noise may mean its too late for the gearbox. The gearbox sits in a plastic tray. Have you notices any oil or an oil film in the tray? This may indicate that the auger seal failed. That allows water to enter the gearbox and displace the oil inside. These gearboxes are never full to the top with oil. So, if you are seeing an oil film in the tray or on the bottom of your motor, its probably too late. Find a Hosizaki service rep and have him look at your unit.
On another note, and this is rare, if you have hard water and haven't descaled the unit regularly, it will sometimes cause a similar noise as the scale grinds between the bearings and the auger. Even with this you may need to replace the bearing(s) and seal. If you haven't seen any oil weeping around the gearbox or motor, try descaling it and see what happens.
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