Aerovent IM-173 - Manual (Page 2)

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
" clearance when
tightened.
Removing Propeller Assembly From Shaft
1. Remove all three capscrews and self-locking nuts 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-8709.
Installation Instructions For Propellers Equipped With
Browning Malleable Iron Split Taper Bushings
B D C
E A
DO NOT LUBRICATE
CAPSCREWS, BORE, OR
BUSHING BARREL.
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 propeller. Use
plated capscrews threaded full length (see table below).
BUSH CAPSCREW TORQUE
NO. SIZE THREADS/IN LENGTH (FT./LBS.)
Q2 3 ⁄
8
" 16 4 1 ⁄
2
" 24
R2 3 ⁄
8
" 16 6" 24
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 withstand 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.
Insert the capscrews through the untapped holes in the bush-
ing and through the hub. Start the self-locking nuts on the
bolts but do not tighten.
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, making allowance for end play
of shaft to prevent rubbing. Do not force propeller and bush-
ing onto shaft. If it does not go on easily, check shaft, bushing
and key sizes.
Tighten capscrews progressively with wrench while hold-
ing self-locking nuts securely with wrench. Do this evenly as
in mounting an automobile wheel. Take a part turn on each
capscrew successively until all are tight.
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