COOK SQI - Manual (Page 5)

5
Changing Fan Speed
All belt driven fans with motors up to and including 5 HP
are equipped with variable pitch pulleys.
a. Loosen setscrew on motor pulley.
b. Open or close the groove facing to change the pitch
diameter.
Speed Reduction - Open the pulley in order that the
belt rests deeper in the groove.
Speed Increase - Close the pulley in order that the
belt rests higher in the groove. Ensure RPM limits
of the fan and the horsepower limits of the motor
are maintained.
c. Retighten pulley setscrew on one of the flat areas of
the motor shaft.
d. After the adjustment is made, check for proper belt
tension. See the Belt and Pulley Installation section.
Pulley and Belt Replacement
a. Remove pulleys from their respective shafts.
b. Clean the motor and fan shafts.
c. Clean bores of pulleys and coat the bores with heavy
oil.
d. Remove grease, rust, or burrs from the pulleys and
shafts.
e. Remove burrs from shaft by sanding.
f. Place fan pulley on fan shaft and motor pulley on its
shaft.
NOTICE! Do not hammer the pulleys onto the shafts
because this may damage the bearings.
g. Tighten in place.
h. Install belts on pulleys and align as described in the
Belt and Pulley Installation section.
Bearing Replacement
The SQI-B fan bearings are pillow block ball bearings.
a. Remove outer access door.
b. Remove bolts/screws to inner housing access doors.
Open and remove the inner access door to reveal
bearings.
c. Remove the old bearing.
d. Remove any burrs from the shaft by sanding.
Maximum RPM
SQI-B
Size
Maximum RPM
SQI-HP
Size
Maximum RPM
90 3341 135 2624
120 2966 150 2692
135 2460 165 2687
150 2209 180 1958
165 2158 195 1901
180 1814 210 1702
195 1590 225 1797
210 1417 245 1775
225 1490 270 1525
245 1485 300 1271
270 1244 330 1208
300 1041 365 1000
330 992 402 995
365 833
402 714
e. Slide new bearings onto the shaft to the desired loca-
tion and loosely mount bearings onto the bearing sup-
port. Bearing bolts and setscrews should be loose
enough to allow shaft positioning.
f. Correctly position the wheel and tighten the bearing
bolts securely to the bearing plate.
g. Align setscrews bearing to bearing and secure tightly
to the shaft.
NOTICE! Never tighten both pairs of setscrews
before securing bearing mounting bolts. This may
damage the shaft.
h. Inspect the wheel position again. If necessary, read-
just by loosening the bearing bolts and setscrews and
repeat from step e.
Wheel Replacement
a. Drill two 1/4” diameter holes, 180
 apart centered
approximately between the shaft and the outside
diameter of the hub, 3/8” to 1/2” in depth.
b. Tap 1/4” holes to 5/16” thread with a 5/16” hole tap.
Do not drill or tap greater than recommended.
c. Screw the puller arms to the full depth of the threads
into the tapped holes. Align center of the puller with
the center of the shaft. Ensure all setscrews in the
hub, normally two, are fully removed.
d. Slowly remove wheel from the shaft.
Recommended Puller
Lisle No. 45000 Sterling Wheel Puller. This puller is avail-
able at most automotive parts retail outlets.
Above - Drilled hole placement.
Right - Wheel puller.