Main Air Blower Wheel Replacement
PELLERIN MILNOR CORPORATION
3.
Remove the old blower wheel.
1. Refer to
Figure 1
. From inside the dryer housing, remove the cone (item 5) and spacer (item
7) by removing the eight bolts, flat washers, and lock washers (item 6). Retain the bolts and
washers. With these components removed, the blower can be removed through the air
passage in the dryer housing.
2. Find a location inside the dryer housing to place the 2x4 blocking. The blocking will help
with installation of the new blower wheel. You will use the 2x4 as a post to hold the new
blower wheel in place temporarily. Measure the needed length and cut the 2x4.
CAUTION 1 : Crush hazards
—In the following steps, you will handle the blower wheel
overhead, inside the dryer housing. Blower wheels range in weight from about 50 to 90
pounds (23 to 41 Kg). The blower wheel may fall as soon as the bearing lock nut is removed.
• Plan your work.
• Use two personnel who are physically suited to the task.
3. Refer to
Figure 2
. The blower wheel is held on the shaft by a bearing lock nut (item 1), a
bearing lock washer (item 2), a shaft key (item 3), and a tight fit on the shaft taper. Bend the
tab on the lock washer away from the groove in the lock nut. Loosen, but do not remove the
lock nut. Tap a groove on the lock nut with a hammer and cold chisel to loosen it.
4. Refer to
Figure 2
. Two threaded holes on the blower wheel hub (item 4) will accept the 3/8"
jack bolts. Insert both bolts until they stop against the top of the blower housing. With the
bearing lock nut still attached, alternately tighten the jack bolts to push the wheel off of the
shaft taper.
Tip:
The blower wheel may be very tight on the taper, especially after lengthy use. Too much
torque on the jack bolts can break the bolts or damage the blower housing. If you cannot coax
the blower wheel loose with reasonable force, use shorter jack bolts and filler material
between the end of each bolt and the top of blower housing to reduce the distance the bolts
must span. For the filler material use steel plate over wood blocking.
5. When the blower wheel is held on the shaft by the lock nut alone, support the weight of the
blower wheel. While supporting the blower wheel, remove the lock nut and lock washer.
Carefully manauver the old blower wheel off of the shaft and out of the dryer housing. The
shaft key may fall out when the blower wheel is removed. Retain all attachment hardware.
Figure 2: Blower Wheel Attachment to Shaft
View of the Blower Wheel and the End of the Shaft
Legend
.
1.
Bearing lock nut
2.
Bearing lock washer
3.
Shaft key
4.
Threaded holes for jack
bolts
4.
Install the new blower wheel.
1. If the shaft key came off of the shaft, replace it. It should fit tightly in the groove on the shaft.
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