Hoshizaki dcm-75ibah service manual 5b. Lower Housing

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16)Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge.

17)Install the new auger assembly with the upper part of the mechanical seal attached. Secure the auger assembly using new allen head cap screws.

18)Replace the evaporator bracket and reconnect the water hoses.

19)Replace spout A, spout B, and the storage bin cover in their correct positions.

20)Move the power switch to the "ON" position, then replace the panels in their correct positions.

21)Turn on the power supply, then move the control switch to the "ICE" position to start the automatic icemaking process.

5. Removal and Replacement of Mechanical Seal and Lower Housing

5a. Mechanical Seal

1)Move the control switch to the "DRAIN" position and drain all of the water from the evaporator.

2)After the water has stopped draining, move the control switch to the "OFF" position, then turn off the power supply. Remove the front and top panels, then move the power switch to the "OFF" position.

3)Remove storage bin cover. Remove spout B, then remove spout A. See Fig. 14.

4)Remove the apron panel, then remove the left side panel.

5)Remove the extruding head heater and the allen head cap screws securing the extruding head and discard the allen head cap screws.

6)Using the cutter, lift out the auger assembly, then remove the evaporator bracket.

7)The mechanical seal consists of two parts. One moves along with the auger, and the other is fixed on the lower housing. NOTICE! If the contact surfaces of these two parts are worn, cracked, or scratched, the mechanical seal may cause water leaks and should be replaced.

8)Remove the allen head cap screws securing the evaporator to the lower housing.

9)Raise the evaporator up to access the lower housing.

10)Remove the mechanical seal from the housing. If only replacing the mechanical seal, proceed to step 13. NOTICE! To help prevent water leaks, be careful not to damage the surfaces of the Oring or mechanical seal.

5b. Lower Housing

11)Remove the O-ring and the bolts securing the housing to the gear motor and remove the housing from the gear motor. If inspection of the upper bearing inside the extruding head (see "IV.C.1. Upper Bearing Wear Check") indicates that it is out of tolerance, replace both it and the bearing inside the lower housing.

Note: Replacing the bearing requires a bearing press adaptor. If one is not available, replace the whole extruding head and housing.

12)Install the O-ring and mount the lower housing on the gear motor.

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Contents DCM-751BAH-OS DCM-751BWH-OS Hoshizaki AMERICA, INC Contents Page Important Safety Information Page DCM-751BAH-OS Construction and Water/Refrigeration Circuit DiagramsDCM-751BWH-OS Ice Making Unit Water/Refrigeration Circuit Diagrams Spout Inlet Water Valve Water Supply Float Diagnosis Control Board Sequence Flow Chart DCM-751BH-OSChart OperationIce Production Check Service DiagnosisDiagnostic Procedure Page Page Page Page Control Board Check 5VDC CB K9 Connector Component Pin # Wire Color 5VDC CB K9 Connector See FigHigh-Pressure Switch HPS Bin Control BC 5VDC CB K8 Connector See Fig5VDC CB K8 Connector Component Pin # Wire Color Gear Motor Protect Relay Gmpr5VDC 0VDC Portion Signal #5 R Red K4 pin closest 5VDC Power Supply #3 W/BK Connector Pin # Wire Color Neutral LBU Open Closed 24VAC CB K2 ConnectorBin Control Check Float Switch Cleaning Float Switch Check and CleaningFloat Switch Check Page No Ice Production Possible Cause Startup Diagnostic TablesNo Ice Production Shutdown No Ice Production Possible CauseWater Dispense-Push Button Ice/Water DispensingIce Dispense-Push Button Ice Dispense-Opti-ServeIII. Controls and Adjustments DCM-751BH Control Board LayoutDCM-751BH-OS K2 Connector Drain Valve #10 W/BUEnergized Components Min Max LED Lights and Audible Alarm SafetiesNo. of Beeps Type of Alarm Reset Options Every 5 sec Icemaking Sequence Sequence StepDrain Frequency Control S1 dip switch Settings and AdjustmentsDefault Dip Switch Settings Infrared Sensor Shutdown Delay S1 dip switch 1, 2Factory Use S1 Dip Switch 9 Continuous Dispensing Timer S1 dip switch 5Bin Control Selector S1 dip switch Bin Control Shutdown Delay S1 dip switchDrain Power Switch, Control Switch, and Dispense Mode SwitchICE OFFPortion Dispense Mode SwitchContinuous Service for Refrigerant Lines IV. Removal and Replacement of ComponentsEvacuation and Recharge R-404A Refrigerant RecoveryBrazing Evaporator Assembly Components. See Fig Important Notes for Component ReplacementEvaporator Assembly Upper Bearing Wear Check Icemaking UnitRemoval and Replacement of Auger Removal and Replacement of Extruding HeadRemoval and Replacement of Evaporator 5b. Lower Housing Removal and Replacement of Gear Motor Dispense and Agitating Motors Dispense ComponentsDispense Auger and Agitator Frequency Area Task MaintenanceMaintenance Schedule VI. Preparing the Appliance for Periods of Non-Use Page VII. Disposal DCM-751BAH VIII. Technical Information Specification SheetsDesign without prior Potable Water WATER-COOLED Condenser DCM-751BWH779 758 Reference without *marks 738 719 ICE Production Performance Data800 363 Wiring Diagrams DCM-751BH-OS