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Blade Angle Adjustment

Blades are set to the specified blade angle at the factory. If

adjustment in the field is required, use one of the following

two methods:

Preferred Method (more accurate)

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 not turn on their own.

3. Place an angle meter 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. 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.

Alternate Method

1. 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 not turn on their own.

2. Angle setting marks on the blade line up with an indicating

arrow on the hub. There are two long marks on the blade,

one for 12° blade angle and another for 32°. Shorter indi-

Type ‘E’ Adjustable Pitch Propeller

General Installation, Operation and Maintenance Instructions For Aerovent Products

Table 1.

TORQUE (ft. lbs.)

FAN HUB

BUSHING BLADE BUSHING

SIZE DIA.

BOLT BOLT

14 - 24 6" H 17 7.5

30 - 36 9" P 30 13

42 - 48 12" P 75 13

42 - 48 12" Q 75 24

Figure 1.

cating marks at 5° increments are in between the two longer

marks. See Figure 2 below.

3. Twist each blade to the desired blade angle.

4. Re-tighten the blade retaining bolts to the torque shown in

Table 1. 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.

Mounting the Propeller Assembly

on the Shaft

Type ‘E’ propellers are furnished with hubs that have a tapered

bore. A split-tapered bushing is used for mounting the propel-

ler assembly to the shaft. When properly assembled, the bush-

ing grips the hub and the shaft with a positive clamping action.

See Figure 3 below.

A. The bushing barrel and the bore of the propeller hub are

tapered. This assures concentric mounting and a true run-

ning propeller.

B. The cap screws, when tightened, lock the bushing in the

propeller.

C. 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.

D. The propeller and bushing assembly is keyed to the shaft

Figure 3.

Figure 2.

IM-176

June 2004

1 2

Blade Angle Adjustment 1
AEROVENT 2

Résumé du contenu

Page 1 - Blade Angle Adjustment

Blade Angle AdjustmentBlades are set to the specified blade angle at the factory. If adjustment in the field is required, use one of the following t

Page 2 - AEROVENT

and held in place by compression. This gives added driving strength.Put the bushing loosely into the propeller. Do not press or drive. Start the cap s

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Aerovent IM-176 Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Ventilateurs Aerovent IM-176. Aerovent IM-176 User Manual Manuel d'utilisatio

Résumé du contenu

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