Owner's manual

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Assembly Procedures

1. Lay hub on a horizontal surface with openings of

shank sockets (Fig. 3) facing up. This is normally

the discharge side of the assembly.

2. Lay blade shank in socket with discharge side of

the blade up. The discharge side of the blade is the

side with the angle setting mark. Line up the index

mark on the blade with the proper angle mark on

the end of the shank socket (Figs. 2 and 4) on the

underside of assembly.

3. Place cap over blade shank with beveled end

toward center. Install U-bolts and elastic nut stops.

Before tightening lock nuts, pull the blade outward

to set the key against the keyway and check angle

setting (Fig. 3).

4. Tighten elastic stop nuts evenly and torque to the

following foot-pounds:

5. Check angle setting to be sure it has not changed

during assembly. If so, loosen lock nuts and reset

angle. Tighten nuts again to proper torque. Do not

over-tighten. Be sure to tighten U-bolts evenly.

Setting Angle With Protractor (optional)

Under most conditions, the preceding assembly proce-

dure using the index marks is of sufficient accuracy.

When greater accuracy is desired, use a level bubble

protractor. Before the final tightening of the nuts, set

the protractor on the angle setting mark. (The hub and

blade assembly must be level for accurate setting.)

Adjust the angle by tapping the shank end with a

mallet. Tighten lock nuts to proper torque. Again check

the angle setting. Rotate propeller to check angle on

each blade in the same location.

Propellers may be assembled so the cap side of the

hub is the inlet side (reverse bore). If blades do not

have the index mark on the discharge side, it is then

necessary to adjust the blade angle with a protractor.

The hub and blades are balanced separately. The

weight distribution throughout the length of the blade

varies slightly. Therefore, the balance is to a constant

moment and blades may be assembled at random

even though the weights are slightly different. Blades

are marked for size and rotation (Fig. 4). “54 R” means

a 54" diameter fan with right-hand rotation.

Adjustable Pitch Propeller Taper-Lock Hub

Cap and U-Bolt Side Lock Nut Side

Fig. 1

Angle setting index on shank socket. Marked from 10° through 50°. Each

mark is 2°. When hub is viewed as shown above, scale on left side

should be used for right-hand propeller and scale on right side should

be used for left-handed propellers.

Fig. 2

Fig. 4

Blade Size

and Rotation

Trailing

Edge

Angle

Setting

Mark

Index

Mark

Inlet Side Discharge Side

PROPELLER HUB U-BOLT TORQUE (FT/LBS)

DIA. DIA. SIZE ALUMINUM FIBERGLASS

54" – 72" 14" 1/2" 20 30

81" – 144 18" 3/4" 45 50

General Installation, Operation and Maintenance Instructions For Aerovent Products

U-Bolts

Cap

Blade

Elastic Stop Nuts

Blade

Shank

Hub

Index Marks

Key

Keyway

Fig. 3

IM-170

June 1997

Summary of content (2 pages)

PAGE 1
IM-170 June 1997 General Installation, Operation and Maintenance Instructions For Aerovent Products Adjustable Pitch Propeller Taper-Lock Hub Assembly Procedures 1. Lay hub on a horizontal surface with openings of shank sockets (Fig. 3) facing up. This is normally the discharge side of the assembly. 2. Lay blade shank in socket with discharge side of the blade up. The discharge side of the blade is the side with the angle setting mark.
PAGE 2
Right-hand or left-hand rotation of propellers is determined as follows: When facing into the discharge of the fan, clockwise rotation is right-hand; counterclockwise rotation is left-hand. The thicker rounded edge of the blade or edge opposite the pointed tip is the leading edge. Installation Instructions For Propellers Equipped With Browning Malleable Iron Split Taper Bushings Aerovent adjustable pitch propellers are furnished with hubs that have a tapered bore.