beautypg.com

Installation instructions, Removing propeller assembly from shaft – Aerovent IM-170 User Manual

Page 2

background image

Aerovent adjustable pitch propellers are furnished with

hubs that have a tapered bore. A split taper 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. The split

taper bushing is always mounted on the discharge or

cap side of the hub unless the propeller has been

ordered with a reverse bore.
A. Bushing barrel and bore of propeller hub are

tapered. This assures concentric mounting and a

true running propeller.

B. Capscrews, when tightened, lock bushing in propel-

ler. Use plated capscrews threaded full length (see

table below).

C. Bushing is split so that when the locking capscrews

force bushing into tapered bore, the bushing grips

the shaft with a positive clamping fit. This will with-

stand vibration and punishing loads without being

loosened.

D. Propeller and bushing assembly is keyed to shaft

and held in place by compression. This gives added

driving strength.

Installation Instructions

Put bushing loosely into propeller. Do not press or

drive. Start capscrews by hand, turning them just

enough to engage threads in tapped holes on propel-

ler. Do not use a wrench at this time. The bushing

should be loose enough in the propeller to move

slightly.

Be sure shaft and keyway are clean and smooth.

Check key size with both shaft and bushing keyways.

Slide propeller and bushing assembly onto shaft, mak-

ing allowance for end play of shaft to prevent rubbing.

Do not force propeller and bushing onto shaft. If it

does not go on easily, check shaft, bushing and key

sizes.

Tighten capscrews progressively with wrench. Do

this evenly as in mounting an automobile wheel. Take

a part turn on each capscrew successively until all are

tight.

These capscrews force the taper bushing into the

hub which in turn compresses the bushing onto the

shaft. This makes a positive clamping fit. The torque

must not exceed 24 ft. lbs. for Q bushings and for R

bushings.

WARNING: Do not attempt to pull bushings flange

flush with hub end. There should be

1

8

" to

1

4

" clear-

ance when tightened.

Removing Propeller Assembly From Shaft

Propeller is easily removed from shaft by inserting and

tightening two of the capscrews 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 from the shaft.
1. Remove all three capscrews from propeller and hub

assembly.

2. Start capscrews 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 some time, it may be necessary to

use a wheel puller to remove the bushing. Never

use a wheel puller on the propeller.

For propeller dimensions, see drawing R-9183.

Installation Instructions For Propellers Equipped With

Browning Malleable Iron Split Taper Bushings

B

D

C

A

DO NOT LUBRICATE

CAPSCREWS, BORE, OR

BUSHING BARREL.

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.

BUSH

CAPSCREW

TORQUE

NO.

SIZE

THREADS/IN

LENGTH

(FT/LBS)

Q2

3

8

"

16

2

1

2

"

24

R2

3

8

"

16

3"

24

2MWG12/11

www.aerovent.com

5959 trenton Lane n | minneapolis, mn 55442 | Phone: 763-551-7500 | Fax: 763-551-7501

®