Walinga Central-Vac Operator And Parts Manual page 43

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. Open the access door on receiver tank.
b. Reach into the top of the airlock and feel
the condition of the wiper blade.
c. Replace it if it is damaged in any way.
5. Blade Replacement:
a. Lock out tag out master panel.
b. Remove chain drive guard.
c. Lift the collector cyclone off the airlock.
d. Remove collector cyclone anchor bolts.
e. Remove the tips from the rotor and the
wiper blade from the housing.
f. File the ends of each replacement blade
so there is approximately 0.006 inches of
clearance between the ends and the
housing.
g. Mount the blades to their respective vane
and tighten bolts finger tight.
h. Loosen and remove drive chain.
i. 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.
j. Tighten the center bolt first. Then the
others.
k. Rotate the airlock and listen if it touches
the housing anywhere. A slight touch is
alright.
l. Repeat mounting procedure with the other
blades.
m. Turn the rotor after each blade is installed
to be sure it does not contact the case.
WARNING
Lock out tag out master panel before
inspecting or maintaining airlock.
CHAIN GUARD
Fig. 5-19 AIRLOCK CHAIN GUARD
n. Mount the new wiper blade. Be sure the
wiper contacts each tip slightly as the
airlock turns.
o. Install and set chain drive tension.
p. Install and secure chain drive guard.
q. Clean thoroughly.
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