5.2.3 AIRLOCK (cont'd)
3. Checking Tip Clearance:
a. Checking the airlock can be done through
the inspection door.
b. Use a feeler gauge to check the clearance
between the tip and the case. Inspect
each tip over its entire width.
c. The clearance of the tips must be
maintained at 0.004 to 0.006* inches at all
times. Adjust or replace tips as required
to insure system sealing. (*614 units .007
to .009).
d. Replace any tips that are bent, chipped or
broken.
NOTE
Blades are reversible if not
excessively damaged.
Fig. 5-18 Tip Clearance
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
procedure:
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. Disconnect hydraulic hoses from the
tractor.
b. Remove the quick connect plugs from
hydraulic lines.
c. Lift the receiver tank off the airlock.
d. Remove the tips from the rotor and the
wiper 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. Install and secure the airlock.
n. Connect hydraulic lines and close access
door.
o. Pour 1/2 gallon Varsol in to the airlock.
Run the airlock at operating speed.
p. Clean thoroughly.
43
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