Cub Crafters CC18-180 Maintenance Manual page 306

(g) BE SURE the aft bulkhead is positioned properly on the flange bushings before
you torque the bolts.
(h) Apply torque in several increments, working diagonally across the bolt circle until
reaching 720–780 in/lbs (60-65 ft/lbs) torque.
(i) Check to make sure the propeller track is within 1/8-inch.
(j) Install 0.040-inch diameter stainless steel safety wire in the propeller bolt heads
locking bolt heads together in a tightening moment. It is recommended that bolts
be wired in pairs, twisting the wire between the bolt heads.
3. WOOD PROPELLER
A. TROUBLESHOOTING
Check propeller balance whenever there is evidence of roughness on operation. For new
propeller installations, rotating the propeller 180 degrees and reinstalling will often help.
B. MAINTENANCE PRACTICES
(1) PROPELLER MAINTENANCE (BOLT TORQUE)
The main factor that leads to the loss of propeller bolt torque is the variation of the wood
hub thickness. The hub thickness will vary with wood moisture content changes and
temperature changes. Even though your propeller has been sealed and/ or painted,
changes in wood moisture content can occur and can significantly change the thickness
of the hub. A one percent (1%) change in the moisture content of a propeller (increase /
decrease) will cause a 0.010" change in hub thickness. As the required compression for
a typical 65 HP wood propeller is 0.021", almost half of the required hub compression
would be lost with such a change. Moisture content changes are not immediate and can
span several weeks or months, depending on many factors such as temperature,
humidity, and operating schedules. Operating temperature changes have similar effects
but are not as severe. For these reasons, it is important to follow the maintenance
schedule below:
60-00
Page: 4
CUB CRAFTERS, INC.
CC18-180 MAINTENANCE MANUAL
Manual number TC10000AMM
Date: 07/18/12