Scotsman Ice Machine AFE325 Service Manual
Flaked and Nugget
Ice Machines
Technical
Service Information
Table of Contents
Introduction .................................. Page 2
Definitions ................................... Page 3
Suggested Tools ................................ Page 4
Tubular Discharge Spout ........................... Page 5
Auger Removal - AFE325 ........................... Page 6
Center Point Breaker ............................. Page 7
MDT3 and MDT4 Variation .......................... Page 8
Auger Removal - AFE400, or MDT3, MDT4 ..................Page 9
Auger Removal - MFE400 ........................... Page 10
Bearing and Evaporator Service - all 2 inch brass & 1/10 HP .........Page 11
Water Seal and Bottom Bearing Installation - covers all 2 inch brass types . . Page 12
Extruded Ice Type - Nugget or Flaked Ice ...................Page 13
Auger Removal ................................ Page 14
Auger Inspection ................................ Page 15
Evaporator Inspection ............................. Page 16
Bearing Service ................................ Page 17
Water Seal Installation ............................ Page 18
Addendum - New Bearing Design May 2010 .................Page 19
Introduction
Scotsman has been manufacturing flaked ice machines since the early 1950s and
nugget ice machines since the early 1980s. Although there have been significant
changes in drive systems, bearings, materials and refrigeration, the basic flaker remains
a vertical refrigerated cylinder containing water and a slowly rotating auger. As the
auger rotates it pushes soft, water laden crystalline ice to the outlet, where it is either
extruded or compressed into nugget or flaked ice.
This booklet contains the technical information to service all current and recent flaked or
nugget ice machines. Older, long obsolete models are not included.
Current Flaker System Designs
Model Type
AFE325 Brass 2 inch 1/10 Cap tube
AFE400 or
AFE424
Prodigy
Flaker or
Nugget Ice
Machine,
NME or FME
The booklet's procedures are divided by platform type:
• AFE325 and prior
• MFE400, MDT3, MDT4, AFE400, AFE424 and prior. AFE424 new in 2010. MDT3
and MDT4 received updated bearings in May 2010.
• Prodigy Flakers, Prodigy Nugget Ice Machines, NME, FME, NSE, MDT5, MDT6
and prior
Evaporator Wall
Material
Brass 2 inch 1/10 TXV
Stainless steel 3 inch 1/4 TXV
Evaporator
Nominal
Diameter
Auger MotorHPMetering
device
Breaker
Flat bearing
retainer, ice
discharge tube
Center point
breaker/bearing
retainer
Extrusion - 16
holes or 6 slots
Page 2
Definitions
Breaker: The top bearing retainer that causes the soft ice to be compressed.
Auger: Stainless steel shaft with one or two spiral flights on it. Forces the flaked ice up
the walls of the evaporator.
Double-Flight Auger: Has two spirals to lift ice, 180 degrees from each other.
Rifling: grooves machined into the inside walls of the evaporator. Helps to guide the ice
vertically.
Water seal: A two piece seal, one rotating one stationary. The rotating part moves with
the auger.
Evaporator: Refrigerated tube of either stainless steel or brass, surrounded by a
continuous copper tube that contains the refrigerant. Also known as worm tube or
freezer.
Direct drive: Refers to the gear reducer with the motor rotor directly engaging gears.
Bearing retainer: Contains the bearing used to support the auger.
General Flaked or Nugget Ice Machine Cleaning Instructions see specific model's manual for complete instructions
Mineral scale on the auger and evaporator walls will reduce ice making efficiency and
add extra load to the auger drive system. Regular cleaning with ice machine cleaner will
reduce that load and improve ice output.
1. Switch the ice machine off.
2. Shut off the water to the evaporator.
3. Drain the reservoir and evaporator.
4. Mix 8 ounces of ice machine cleaner with 3 quarts of potable water.
5. Pour the cleaning solution into the reservoir until it is full.
6. Soak the machine with cleaner solution for 15 minutes.
7. Switch the ice machine on and pour the remainder of the cleaning solution into the
reservoir until it is all used.
8. Open the water valve and let fresh water into the ice machine.
9. Discard any ice that was made during cleaning.
Page 3
Suggested Tools
Pullers:
• 2 or 3 jaw puller – use for couplings & bearings
• Slide hammer puller – use to pull augers
Adapters to fit augers:
• Small brass flakers – 7/16 -14
• Large brass flakers –½-20
• Nugget - 5/8 – 18
• MDT2 - 7/16 -14
Breaker removal
• 1/8" wire chain cut to grab cap on small brass
flakers. Not applicable to AFE424 or updated
bearing units.
Slide Hammer with tips
Wrenches:
• ½” gear drive ratchet
for adapter & freezer
bolts
Misc:
• Snap ring pliers
• Corbin clamp pliers
Small Length of Chain
1/2" Gear Drive Wrench
3-jaw puller
Corbin Hose Clamp Pliers
Page 4
Snap Ring Pliers
Tubular Discharge Spout
Models Covered: AFE325
The main characteristic of the AF or prior MF system is the tubular discharge spout and
mushroom-topped auger. Ice is made in the normal way, but at the top of the
evaporator, the soft ice forced into a small area formed between the mushroom top and
the evaporator wall which compresses it into a dryer form. Then, as the auger turns, the
compressed ice is collected by the spout casting that is attached to the side of the
evaporator. The collected ice flows through a movable tube to the bin. A spout safety
switch is attached to the side of the tube, so if the tube becomes restricted with ice, the
tube is pushed away from the auger, tripping the switch and shutting the machine off.
Mushroom
Top Bearing
Ice Outlet
Area
Auger
Refrigeration
Tubing
Water Seal
Bottom
Bearing
Water Inlet
Tube
AFE325 Evaporator Schematic
Page 5
Auger Removal - AFE325
1. Disconnect electrical power.
2. Shut off water supply and drain reservoir and
evaporator.
3. Pull up on black rubber cap and remove it.
4. Remove two allen head screws holding spout
assembly to evaporator and disconnect spout from
evaporator.
5. Remove one screw holding top bearing retainer to
evaporator. It is holding the spout mounting plate to
the evaporator.
6. Pull up on cap hook to remove auger. If more
force is required, use a 12 inch length of 1/8" chain,
with each end cut into a hook. Remove the cap hook
and insert the chain into the holes. Insert a wrench
or hammer through the chain and pull up to pull out
the auger.
Allen
Head
Screw
Retaining
Screw
Spout Removal
Cap Hook
Spout
Top View, Spout Removal
Another method is to use a slide hammer puller. To
use, use a snap ring pliers to remove the cap hook
and the cap.
Remove the bolt at the top of the auger.
Thread the slide hammer into the auger, and use the
slide to remove the auger.
Using Chain
Using Slide Hammer
Page 6
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