Flaked and Nugget Ice Machines - Technical Service Information
Contents
1. Scotsman Flaked and Nugget Ice Machines Uu Lo Ai COLETA A g q N ST R o E J AAA MU n E oO e Service Information Table of Contents Introduction we ee ee ee eee GEES a Page 2 Definitions o o camisa eo Be E Sd ee td Seed i Page 3 Suggested Tools La Gee eee eae eBeke Ge eee He Ge PRE KS Page 4 Tubular Discharge Spout 2 a a II ee Page 5 Auger Removal AFE325 2 2 Page 6 Center Point Breaker SI I I G GG Y a Page 7 MDT3 and MDTA Variation 0 00 00 eee Page 8 Auger Removal AFE400 or MDT3 MDT4 ahaaa a Page 9 Auger Removal MFE400 9 GI I y Page 10 Bearing and Evaporator Service all 2 inch brass amp 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 II I I GI GG I I G GG I I I Page 14 Auger Inspection Gn WE GR US EU O On O DW te eS a Page 15 Evaporator Inspection o Page 16 Bearing Service SI I I IG GG GG GI G GG I I I uy Page 17 Water Seal Installation SI II 048 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 signif2. cleaning NOOO fF WD gt Page 3 Suggested Tools Pullers e 2 or 3 jaw puller use for couplings amp bearings Slide hammer puller use to pull augers Adapters to fit augers e Small brass flakers 7 16 14 e Large brass flakers 7 20 e Nugget 5 8 18 e MDT2 7 16 14 Slide Hammer with tips Breaker removal AN SN e 1 8 wire chain cut to grab cap on small brass Ad A flakers Not applicable to AFE424 or updated amp Ka bearing units i Wrenches AN e gear drive ratchet Small Length of Chain for adapter amp freezer bolts Misc Snap ring pliers e Corbin clamp pliers 1 2 Gear Drive Wrench Corbin Hose Clamp Pliers Snap Ring Pliers Page 4 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 mach
3. the inside of the evaporator wall must be vertical Page ll Water Seal and Bottom Bearing Installation covers all 2 inch brass types 1 Remove old rotating half from the auger Clean the mounting area Sealant Here 2 Place a bead of food grade sealant Such as scotsman part number 19 0529 01 onto the shoulder of the auger where the rotating half of the water seal will be installed 3 Wash the new seal in water While wet slip it onto the bottom of the auger rubber side toward the auger Push up until seated against the sealant Do not allow any sealant to come into contact with the face of the seal 4 Wash the stationary half the water seal with water Slip it up into the bottom of the evaporator until the bottom of the seal is inside the evaporator about 1 4 9 Push the bottom bearing against the water seal until the bottom bearing is inside the evaporator about 1 16 6 Replace the evaporator on the adapter and re attach the stand using the original bolts 7 Attach the auger to the top bearing and breaker 8 Return the auger to the evaporator and slide it down until the splines touch the coupling Note Pre align the breaker holes with the evaporator holes to aid in installation 9 Rotate the auger until the coupling splines align with the auger 10 Push the auger down and rotate the breaker until the screw holes line up with the pilot holes in the evaporator 11 When the auger is c
4. 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 Switch the ice machine off Shut off the water to the evaporator Drain the reservoir and evaporator Mix 8 ounces of ice machine cleaner with 3 quarts of potable water Pour the cleaning solution into the reservoir until it is full Soak the machine with cleaner solution for 15 minutes 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
5. bearing and longer evaporator but it does not have the double flight auger Top Bearing Spout O go 9 Ice Outlet Area JN Double flight or two spiral auger MDT4 Evaporator Schematic Page 8 Auger Removal AFE400 or MDT3 MDT 4 1 Disconnect electrical power 2 Shut off water supply and drain reservoir and evaporator 3 Remove necessary panels to get access to the side of the evaporator opposite the spout 4 Remove two permagum plugs from evaporator side Remove Permagum 9 Remove the two phillips head screws located dan ms Ym under the the permagum 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 Note Bearing enclosure changed in 2007 and top bearing changed May 2010 Both have a plastic cap and the cap hook or chain method will not apply An inch and a half Tee can be attached and use for pulling Revised Design 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 o
6. eal when replacing either part Ball bearing type The top bearing can be removed by a press if the bearing is intact If the inner race slips out of the bearing the entire bearing retainer breaker with a new bearing must be installed Note The bearing cannot be greased in the field Overfilling with grease will cause bearing failure Roller bearing type The bearing can be replaced See page 19 Coupling Removal The coupling that connects the auger splines to the output shaft of the gear reducer usually stays on the gear reducer when the auger is removed The splines are pre lubricated at the factory and can also be lubricated in the field using the grease fitting on the side Occasionally the coupling will stick to the output shaft and resist removal In those cases use of a two or three jaw puller is recommended to remove the coupling Evaporator Inspection The brass evaporator shouldn t need to be replaced unless the auger has come into contact with the inside wall The inside wall contains vertical grooves or rifling that can be used as a guide to determine if the evaporator can be salvaged Shallow marks from the auger can be honed and sanded out However if the auger has gouged the evaporator wall as deep as the vertical groove the evaporator should be replaced Evaporator Service The brass evaporator can be honed using an automotive cylinder hone followed by vertical sanding to remove the honing marks All marks on
7. f the auger Thread the slide hammer into the auger and use the slide to remove the auger j E i dy i j e Attach Slide Hammer Page 9 Auger Removal MFE400 1 Disconnect electrical power Foam Cap 2 Shut off water supply and drain reservoir and evaporator 3 Remove necessary panels to get access to the side of the evaporator opposite the spout 4 Remove styrofoam cap 5 Remove two screws from the side of 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 Back View of MFE400 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 Remove Two Screws Pull Auger Up and Out Page 10 Bearing and Evaporator Service all 2 inch brass amp 1 10 HP After the auger has been removed the bottom half of the water seal and the bottom bearing will still be in the bottom of the evaporator To remove them 1 Remove the evaporator from the adapter stand 2 Push or tap down on the water seal to remove both parts Note Always replace BOTH bearings AND the water s
8. icant 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 Evaporator Model Type Evaporator Wall Niwa taal Auger Motor Metering Breaker Material HP device Diameter Flat bearing AFE325 Brass 2 inch 1 10 Cap tube retainer ice discharge tube Center point AFE400 or AFF424 Brass 2 inch 1 10 TXV breaker bearing retainer Prodigy HO Extrusion 16 Nugget Ice Stainless steel 3 inch 1 4 TXV holes or 6 slots Machine NME or FME The booklet s procedures are divided by platform type e AFE325 and prior e MFE400 MDT3 MDT4 AFE400 AFE424 and prior AFE424 new in 2010 MDT3 and MDT4 received updated bearings in May 2010 e Prodigy Flakers Prodigy Nugget Ice Machines NME FME NSE MDT5 MDT6 and prior 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
9. ine off Mushroom Top Bearing Auger Ice Outlet Area 9 Refrigeration Tubing Q Jr FU Water Inlet a lt Tube Fo x s e di Sp dl at Water Seal Jo Bottom Bearing Us E AFE325 Evaporator Schematic Page 5 Auger Removal AFE325 1 Disconnect electrical power 2 Shut off water supply and drain reservoir and evaporator Allen 3 Pull up on black rubber cap and remove it Head E Screw ps aa Retaining Screw a Pi i 4 Remove two allen head screws holding spout assembly to evaporator and disconnect spout from evaporator Spout Removal 9 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 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
10. ll or drive out the lower half of the water seal To Replace the Water Seal 1 Lubricate the water seal with water and push the water seal into the bottom of the evaporator slightly past the groove for the snap ring 2 Replace the snap ring and pull the water seal down against it 3 The part of the water seal that rotates with the auger must also be replaced Remove the old part from the auger and clean the mounting area 4 Place a small bead of food grade silastic sealant such as 732 RTV or Scotsman part number 19 0529 01 on the area of the auger where the water seal is to be mounted 5 Carefully push the water seal rubber side against the auger shoulder and the silastic Do not get any sealant onto the face of the seal 6 Allow the auger and seal to air dry until the silastic is dry on the surface 7 If the original water seal was leaking it would be a good idea to inspect the interior of the gearmotor 8 Assemble auger to breaker carefully insert auger into evaporator Rotate to engage gear reducer shaft Page 18 Addendum New Bearing Design May 2010 Applies to MDT3 MDT4 and AFE424 The replacement top bearing breaker and auger for the AFE400 424 MDT3 and MDT4 have been changed They are significantly different from the prior parts Two kits have been developed The AFE400 424 bearing and auger kit is 02 4578 01 The MDT3 amp MDT4 bearing and auger kit is 02 4578 02 It also fits MFE400 Each kit is c
11. moothly i 4 fo If the bearing only needs grease inject grease into the bearing using Scotsman grease needle pn 02 3559 01 and Scotsman bearing grease cartridge pn A36808 001 Be sure to inject grease evenly and thoroughly Bearing Replacement Adding Grease Using Needle The bearing can be replaced if it can be pressed out of the bearing retainer An arbor press is required to remove the bearing Whenever the bearing is replaced the two lip seals under the bearing must also be replaced Lip Seal Replacement PVC Press out the old bearing and pry out the old Coupling lip seals Place the first new lip seal in the bearing retainer the U faces up Use a 2 PVC coupling and place it in the U of the seal Press the seal into place with the coupling Repeat for the second seal After the lip seals have been replaced the EN new bearing can be pressed into the bearing Inserting Lip Seal Using PVC Coupling retainer The breaker generally does not wear out and need to be replaced unless there has been severe bearing failure Page 17 Water Seal Installation To Remove the Water Seal Assuming all steps to remove the auger have been performed 1 The gearmotor evaporator assembly will have to be exposed 2 Remove the 4 hex head cap screws holding the evaporator to the gearmotor assembly Lift the evaporator up and off of the gearmotor 3 Remove the wire retainer from the groove under the water seal 4 Pu
12. o the outside of the breaker during final assembly Roller Section with Installation Tool Retaining Ring Thrust Section a Insert retaining ring when used into groove inside breaker b Add about 1 oz of grease to thrust bearing and place on top of roller bearing housing Note Grease is Mobilith SCHPM460 Scotsman part number 19 0662 02 c Place thrust washer onto top of thrust Roller Section Installed bearing d Install onto auger e Install and tighten bolt f Attach cap be sure it is on tight 11 Install auger into evaporator Note New bottom bearing and water seal recommended Grease and Thrust Bearing Added Page 20 SCOTSMAN 775 Corporate Woods Parkway Vernon Hills IL 60061 800 533 6006 www scotsman ice com 291 830
13. omplete with new auger top and bottom bearings and water seal Removal of the auger is the same as on page 9 The top bearing can be replaced 1 Get access to the top of the evaporator 2 Remove cap from top of breaker Top Bearing Construction 3 Loosen but do not remove bolt holding auger to bearing 4 Remove two phillips head screws from side of breaker 5 Attach a T like on page 9 to the top of the breaker 6 Pull auger up and out of the unit 7 Remove bolt holding auger to bearing pull bearing from auger 8 Remove retaining ring from inside of breaker just above roller section Early 2010 parts did not have a retaining ring 9 Invert breaker and drive old bearing out of breaker 10 Assemble new bearing Bearing will be installed in two sections first the roller section and then the thrust section Page 19 The roller section must be held together during installation Suggested method a Assemble a 1 75 5 16 18 bolt 2 flat washers and a 1 2 long piece of 3 4 PVC tubing The tubing must be cut square b Install parts onto new bearing as shown c Drive the bearing into the breaker cavity by lightly tapping on the bolt the PCV helps to avoid damaging the bearing surface Remove bolt spacer and washers when done Note Remove the outside o ring and put the breaker into the evaporator tube to support the breaker while driving in the bearing Be sure to put the o ring back ont
14. ompletely seated reinstall the breaker screws and the bearing cap 12 Replace permagum and foam top Page 12 Extruded Ice Type Nugget or Flaked Ice Models Covered FM FME ND NDE NM NME NS NSE MDT5 MDT6 In these models the ice is made in the usual way but at the top of the evaporator it is extruded through vertical holes or slots The bearing retainer bolted to the top of the evaporator has either holes for nugget ice or slots for flaked ice machined into it As the soft ice is pushed through the holes or slots it is compressed into either nugget or flaked ice After the ice is extruded it is forced to the out side causing the extruded ice to break off into usable lengths Top Bearing Breaker Bearing ONY Retainer E Ice Extrusion H Holes Ice Outlet Area ON i Refrigerant L Tubing Double flight U auger PS sd i Water Seal NME Type Evaporator Schematic Page 13 Auger Removal 1 Disconnect electrical power 2 Shut off water supply and drain reservoir and evaporator 3 Remove necessary panels 4 Remove ice chute cover 5 Unscrew ice sweep 6 The auger and breaker bearing may now be remo
15. s an auger will appear clean when wet but after it is dry it will be seen to be stained Scrub the auger with ice machine cleaner and hot water Caution Ice machine cleaner is an acid Handle it with extreme care keep out of the reach of children 2 The water seal area Because the auger has been removed the water seal will have to be replaced Remove the water seal top half from the auger and remove any sealant or debris from the shoulder of the auger where the water seal was Page 15 rs Example of a Clean Auger Evaporator Inspection The evaporator s inner wall has 12 shallow vertical grooves machined into the stainless steel surface These grooves provide direction for the ice as it is pushed up the evaporator by the auger If the grooves are damaged or there are radial marks on the inside of the evaporator it should be replaced The stainless steel evaporator cannot be honed as honing leaves radial marks that cannot be sanded out Most scale will be removed by ice machine cleaner during the de scale process Stubborn scale deposits on the evaporator surface can be sanded but the sanding motion must be vertical Page 16 ur i Sanding the Evaporator Bearing Service Inspect the bearing There should be plenty of grease in sight If grease is needed the lt Needle bearing and breaker should be removed to check the action of the bearing It should rotate s
16. the slide to remove the auger Using Slide Hammer Page 6 Center Point Breaker Models Covered AFE400 MDT3 MDT4 MFE400 and many prior In this type of flaker ice is made in the usual way but at the top of the evaporator there is a brass bearing retainer This bearing retainer is shaped with a tapered base facing the auger that slopes upward to the ice discharge spout The tapered base has two slopes with a point in between so two streams of ice are formed as ice is forced against it As ice is made it is pushed up the evaporator by the auger At the top of the auger the ice is compressed against the tapered base of the bearing retainer This squeezes much of the water out of the ice and forces the compressed ice into the ice discharge spout Center Point Breaker Top Bearing Ice Breaker Bearing Retainer Ice Outlet Area Auger ssa Coupling os AFE400 Evaporator Schematic Page 7 MDT3 and MDT4 Variation The MDT3 and MDT4 evaporators are very similar to the AFE400 but there are differences They include Double flight auger use began June 2005 Two row ball top bearing Longer evaporator and auger e Capillary tube metering device The MFE400 also has the two row top
17. ved as an assembly a Unscrew 4 allen head cap screws holding breaker to evaporator b Lift up on breaker and remove auger from evaporator Note If the auger is stuck the breaker must be removed from the auger The breaker may be removed from the auger and evaporator without disturbing the auger a Unscrew breaker cover from breaker left hand threads b Unscrew auger stud from top of auger Remove allen head cap screws c Unscrew 4 allen head cap screws holding breaker to evaporator d Lift up amp remove breaker from evaporator e Lift up and remove auger from evaporator Note If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded hole The size of that hole is 5 8 18 Attach Slide Hammer Page 14 Auger Inspection The auger must be carefully inspected for wear and scale There are also wear areas like the top bearing surface and the edges of the flights The edges of the auger have horizontal serrations and highly machined areas in between If the auger has contacted the evaporator wall it will have very rough flight edges and should be replaced Scale forms on the auger during normal ice making If scale is still on the auger after cleaning in the ice machine the scale can be removed using ice machine cleaner and a nylon scrub pad Inspect the auger the critical areas of the auger are 1 The auger body It should be clean and shining Sometime
Download Pdf Manuals
Related Search