Hoshizaki F-500BAJ Service Manual page 45

6. Removal and Replacement of Mechanical Seal and Lower Housing
6a. Mechanical Seal
1) Drain the water from the evaporator.
a) Remove the front panel, then move the power switch to the "OFF" position.
b) Move the control switch to the "DRAIN" position.
c) Move the power switch to the "ON" position and allow the water to drain from the
evaporator.
d) Move the power switch to the "OFF" position, then unplug the appliance from the
electrical outlet (F-300BAJ) or turn off the power supply (F-500BAJ).
2) Remove the top and side panels.
3) Remove the strap connecting the spout to the chute assembly, then remove the spout.
4) Remove the extruding head seal bolts. Using the cutter, lift out the auger assembly.
5) The mechanical seal consists of two parts. One moves along with the auger, and the
other is fixed on the lower housing. If the contact surfaces of these two parts are worn,
cracked, or scratched, the mechanical seal may cause water leaks and should be
replaced.
6) Remove the socket head cap screws and split lock washers securing the evaporator to
the lower bearing housing.
7) Raise the evaporator up to access the lower housing.
8) Remove the O-ring and mechanical seal from the housing. If only replacing the
mechanical seal, proceed to step 11.
To help prevent water leaks, be careful not to damage the surfaces of the O-ring or
mechanical seal.
6b. Lower Housing
9) Remove the hex bolts w/washers securing the lower housing to the gear motor and
remove the lower housing from the gear motor. If inspection of the upper bearing inside
the extruding head (see "IV.B.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 lower housing.
10) Mount the lower housing on the gear motor.
11) Install the O-ring and lower part of the mechanical seal on the lower housing.
12) Make sure the lower mechanical seal is in place, then place the evaporator in position.
Secure the evaporator to the lower housing using the socket head cap screws and split
lock washers.
13) Install the auger assembly with the upper part of the mechanical seal attached.
14) Replace the removed parts in the reverse order of which they were removed.
Note: Be sure to use new seal bolts. See "Seal Bolt Removal and Installation
Instructions" earlier in this section.
NOTICE
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