Aerovent IM-111 User Manual

®

IM-111

January 2012

General Installation, Operation and Maintenance Instructions For Aerovent Products

BackSwept Propeller

Blade Angle Adjustment

Blades are set to the specified blade angle at the
factory. If adjustment in the field is required, use the
following method:

1. Lay the hub on a horizontal surface with the
concave (air leaving) surfaces of the blades facing
upwards.

2. Loosen the blade retaining bolts until they are
finger tight. At this point, the blades should rotate
in their sockets when grasped firmly and twisted,
but should not turn on their own.

3. Place an angle meter or protractor across the two
blade angle position marks on a blade. See Figure 1.

4. Twist the blade to the desired blade angle.

5. Repeat steps 3 and 4 for the remaining blades.

6. Re-tighten the blade retaining bolts to the torque
shown in Table 1, making certain that the blades
stay positioned at the desired angle. Work in a
star pattern, working your way up to the desired
torque in steps. Tightening one bolt to the full
torque before moving on to the next can crack
the hub.

Table 1

HUB SIZE

150mm (6") 5.5 ~ 8 (4 ~5.9) 10.7 (7.9)

225mm (9") 5.5 ~ 8 (4 ~5.9) 21.7 (16)

255mm (10") 30 (22) 21.7 (16)

350mm (14") 30 (22) 39.3 (29)

BLADE BOLTS

N/m (ft. lbs)

HUB BOLTS

N/m (ft. lbs)

Disconnect power before installation and
maintenance. Failure to do so can result in
severe injury or death.

Mounting the Propeller Assembly on the
Shaft

The BackSwept Propellers are furnished with hubs
that have a tapered bore. A split-tapered bushing
is used for mounting the propeller assembly to the
shaft. When properly assembled, the bushing grips
the hub and the shaft with a positive clamping action.
See Figure 2.

 The bushing barrel and the bore of the propeller

hub are tapered. This assures concentric mounting
and a true running propeller.

 The cap screws, when tightened, lock the bushing

in the propeller.

 The bushing is split so that when the locking cap

screws force the bushing into the tapered bore,
the bushing grips the shaft with a positive clamp­ing fit. This will withstand vibration and punishing
loads without loosening.

 The propeller and bushing assembly is keyed to

the shaft and held in place by compression. This
gives added driving strength.

Figure 2

WARNING

Figure 1

©2012 Aerovent

WARNING

Do not lubricate the cap screws, bolt, shaft
or bushing barrel.

Put the bushing loosely into the bore of the hub. Do
not press or drive. Start the cap screws by hand,
turning them just enough to engage the threads in
the nut, which are recessed into the hub on the
propeller. Do not use a wrench at this time. The
bushing should be loose enough in the propeller to
move slightly.
Be sure the shaft and keyway are clean and
smooth. Check the key size with both the shaft and
bushing keyways. Slide the propeller and bushing
assembly onto the shaft, making allowance for end
play in the shaft to prevent rubbing. Do not force
the propeller and bushing onto the shaft. If it does
not go on easily, check the shaft, bushing, and key
sizes.
Tighten the cap screws progressively with a
wrench. Do this evenly as in mounting an automobile
wheel. Take a part turn on each cap screw succes­sively until all are tightened to the torque shown in

Table 1.

These cap screws force the tapered bushing into
the hub, which in turn compresses the bushing on
to the shaft.

Removing the Propeller Assembly from
the Shaft

The propeller is easily removed from the shaft by
inserting and tightening two of the cap screws into
the tapped holes in the bushing flange. This forces
the bushing loose from the propeller and releases the
compression so that the entire assembly will slide off
the shaft.

1. Remove all the cap screws from the propeller and
hub assembly.

2. Start the cap screws into the threaded holes in
the bushing flange.

3. Tighten each bolt part of a turn successively to
force the propeller off the bushing.

4. Pull the bushing off the shaft. If the assembly has
been in place for some time, it may be neces­sary to use a wheel puller to remove the bushing.
Never use a wheel puller on the propeller.

WARNING: Do not attempt to pull the bushing flange
flush with the hub end. There should be 1/8" to 1/4"
clearance when tightened.

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