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Models 8751/8754Operating Procedures
Air/Mix Pump Assembly
The purpose of the air/mix pump is to meter a specific
amount of air and mix, and to transfer this combination
to the freezing c ylinder.
Refer to the illustration on page 8 for identification of
parts during assembly.
Step 1
Assemble the piston. Slide the o-ring into the groove
on the piston. DO NOT lubricate this o -ring.
Figure 19
Step 2
Assemble the liquid valve body. Slide the three check
bands and three o-rings into the grooves on the liquid
valve body. DO NOT lubricate the check bands or
o-rings.
Figure 20
Note: Check bands have two smooth surfaces. A
concave shape indicates an incorrect assembly. Tur n
the check band inside out to correctly expose the flat
surface.
Figure 21
Step 3
Put a small amount of lubricant on the inside diameter
of the piston. Insert t he narrow end of the liquid valve
body into the open end of the piston.
Figure 22