4.
Wiper Blade:
A wiper blade is located at the top of the airlock
to clean the tips as the airlock turns.
To check the wiper blade, follow this proce-
dure:
a. Reach into the top of the airlock and feel
the condition of the wiper blade.
b. Replace it if it is damaged in any way.
5.
Blade Replacement:
a Lock out tag out master panel.
b. Lift the airlock inlet assembly off the airlock.
c. Remove the anchor bolts.
d. Remove the tips from the rotor and the wiper
Fig. 5.17 Airlock
blade from the housing.
e. File the ends of each replacement blade so
there is approximately 0.006 inches of
clearance between the ends and the housing.
f.
Mount the blades to their respective vane and
tighten bolts finger tight.
g. Rotate airlock rotor slightly to set the
clearance between the blade and the
case. Be sure to set it at 0.004 inches of
clearance. Use a feeler gauge.
h. Tighten the center bolt first. Then the others.
i.
Rotate the airlock and listen if it touches
the housing anywhere. A slight touch is
alright.
j.
Repeat mounting procedure with the other
blades.
k. Turn the rotor after each blade is installed to be
sure it does not contact the case.
l.
Mount the new wiper blade. Be sure the wiper
contacts each tip slightly as the airlock turns.
m. Clean thoroughly.
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