Propeller Owner’s Manual
139
INSTALLATION AND REMOVAL
61-00-39
Page 3-44
Rev. 17 Apr/20
G. Installing HC-( )3( )( )-7( ) Propeller on the Allison Engine
CAUTION:
INSTRUCTIONS AND PROCEDURES IN
THIS SECTION MAY INVOLVE CRITICAL
PARTS. REFER TO THE INTRODUCTION
CHAPTER OF THIS MANUAL FOR
INFORMATION ABOUT PROPELLER
CRITICAL PARTS. REFER TO THE
ILLUSTRATED PARTS LIST CHAPTER
OF THE APPLICABLE OVERHAUL
MANUAL(S) FOR THE IDENTIFICATION
OF SPECIFIC PROPELLER CRITICAL
PARTS.
This propeller incorporates a beta valve assembly
(Figures 3-12 and 3-13), which is installed inside of the
propeller shaft and extends from the rear of the engine to the
front of the propeller piston. This assembly is installed in the
engine shaft before the propeller is installed.
(1) Make sure that the shaft adaptor (Refer to Figure 3-13)
is installed in the engine shaft.
(2) Install the C-3317-116 O-rings in the two grooves
(Refer to Figure 3-13) of the shaft adaptor.
(3) Remove the cover plate from the rear of engine case.
Refer to Figures 3-12 and 3-13.
(4) Prepare the beta valve.
NOTE: The beta valve should be preassembled as
shown in Figure 3-12 less the pitch change
rod, engine shaft adaptor, engine supplied
o-rings and cover plate when new or from
overhaul.
Refer to Figures 3-12 and 3-13.
(a) If the beta valve is supplied preassembled, remove
the self locking nut, spacer, rod end cap, rod end
fitting, bushing and check nut.
