
      Manitowoc SN12/SN20 Model Nugget Ice Machines 
              Cutter Head Replacement Instructions 
1. Disconnect water supply. 
2. Remove front panel. 
3. Move toggle switch to CLEAN position after the 5 minute delay expires. The evaporator and float 
chamber will drain. 
4. Disconnect power at electrical disconnect. 
 WARNING 
Disconnect power to the ice machine at the electrical disconnect, moving 
the toggle switch to the off position will not disconnect line voltage. 
5. Remove top, left and right side panels. 
6. Remove ice chute assembly. 
NOTE; if the ice wiper can not be hand removed; place the handle end of a screwdriver against the ice 
wiper, then tap the screwdriver (counterclockwise) with a hammer to loosen the ice wiper from the 
auger. 
REMOVE COVER 
REMOVE ICE DAMPER 
REMOVE STRAINER 
REMOVE ICE WIPER 
REMOVE ICE CHUTE 
LOOSEN HOSE CLAMP AND 
Manitowoc Foodservice 
2110 South 26 
Telephone 920-682-0161, Fax - Sales: 920-683-7589, Service/Parts: 920-683-7585, Other: 920-683-7879        Sheet 1 of 2  
Web Site - www.manitowocice.com
th
 Street, P.O. Box 1720, Manitowoc, WI 54221-1720 USA              000004021 
      08/25/08 

7. Peel evaporator insulation down to expose 3 bolts securing top cutter head - remove 3 bolts. 
7. Use puller to remove cutter head from auger shaft. NOTE: If the bearing is destroyed or the auger heavily damaged 
from bearing wear contact the Manitowoc service department @ 1-800-545-5720.
8. Install new cutter head and secure with three bolts removed in step 7. Use removable loctite on bolt 
threads. 
9. Reassemble chute assembly and test run ice machine. 
Manitowoc Foodservice 
2110 South 26 
Telephone 920-682-0161, Fax - Sales: 920-683-7589, Service/Parts: 920-683-7585, Other: 920-683-7879        Sheet 2 of 2  
Web Site - www.manitowocice.com
       Sheet 2 of 2  
th
 Street, P.O. Box 1720, Manitowoc, WI 54221-1720 USA              000004021 
      08/25/08