7
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 Cover Screws (Several screws on
opposite side not shown in photograph.)
Bearing Cover
Maximum RPM
SQN-B
Size
Maximum RPM
SQN-HP
Size
Maximum RPM
Non
Reinforced
Wheel
Reinforced
Wheel
Non
Reinforced
Wheel
Reinforced
Wheel
60 3795 - 135 2622 -
70 4006 - 150 2929 -
80 3409 - 165 2635 -
100 3243 - 180 2169 -
120 2867 - 195 1955 -
135 2332 - 210 1781 -
150 2099 - 225 1500 1861
165 1833 2107 245 1185 1773
180 1610 1786 270 1025 1563
195 1429 1593 300 980 1204
210 1277 1399 330 830 1178
225 1152 1459 365 735 1038
245 1015 1434 402 630 970
270 876 1226
300 837 1024
330 716 962
365 624 786
402 539 683
Bearing Replacement
The fan bearings are pillow block ball bearings.
a. Loosen screws on bearing cover.
b. Push bearing cover toward the wheel. As the bearing
cover moves toward the wheel it will slide down to
reveal the bearings and shaft. Refer to Figure 6.
c. Remove the old bearing.
d. Remove any burrs from the shaft by sanding.
e. Slide new bearings onto the shaft to the desired loca-
tion and loosely mount bearings onto the bearing
support. 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 support.
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.
Wheel Replacement Components
Above - Drilled hole placement.
Right - Wheel puller.
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