17
Model 490 Operating Procedures
Step 4
Remove the draw valve from the freezer door.
Remove the two o-rings from the draw valve.
Note: To remove o-rings, use a single service towel
to grasp the o-ring. Apply pressure in an upward
direction until the o-ring pops out of its groove. Wit h
the other hand, push the top of the o-ring forward,
and it will roll out of the groove and can be easily
removed. If there is more than one o-ring to be
removed, always remove the rear o-ringfirst. This
will allow the o-ring to slide over the forward o-rings
without falling into the open grooves.
Step 5
Thoroughly brush clean all disassembled parts in the
cleaning solution, making sure all lubricant and mix
film is removed. Take particular care to brush c lean
the draw valve core in the freezer door. Place all the
cleaned parts on a clean dry surface to air dry
overnight.
Step 6
Return to the freezer with a small amount of
cleaning solution. With the black bristle brush, brus h
clean the rear shell bearing at the back of the
freezing cylinder.
Figure 22
Step 7
Using single service towels, wipe clean all exterior
surfaces of the freezer.