Hoshizaki RELIABILITY IS A BEAUTIFUL THING DCM-270BAH-OS - Manual (Page 39)

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13) Disconnect the brazing-connections of the expansion valve and the copper tube - low
side from the evaporator, using brazing equipment.
14) Braze the new evaporator with nitrogen gas flowing at a pressure of 3-4 PSIG.
15) Replace the drier.
16) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
17) Evacuate the system and charge it with refrigerant. See the nameplate for the required
refrigerant charge.
18) Remove the four socket head cap screws at the bottom of the evaporator.
19) Disconnect the hose from the evaporator.
20) Lift off the evaporator.
Housing and Mechanical Seal
21) Remove the four hexagon bolts securing the housing to the gear motor.
22) Remove the mechanical seal fixed on the housing.
Note: The mechanical seal consists of two parts. One moves along with the auger, and
the other is fixed on the housing. If the contact surfaces of these two parts are worn
or scratched, the mechanical seal may cause water leaks and should be replaced.
23) Replace the bearing inside the housing using a fitting tool, if the bearing is worn or
scratched.
Note: Replacing the bearing requires a fitting tool. If one is not available, replace the
whole housing. Be sure to install the O-ring.
Gear Motor
24) Cut the gear motor leads at the wire connector.
25) Remove the three hexagon bolts securing the gear motor on the chassis.
26) Remove the gear motor.
27) Install the new gear motor.