garyvanremortel(at)gmail.
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 Posted: Wed Mar 12, 2025 7:37 pm Post subject: Hartzell c/s prop info |
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Those of you who have this prop may be interested in knowing about Service Letter HC-SL-61-278. It supersedes older A-2421 (1.500" long) low pitch stop set screw and B-3359 shear locknut with 102472 (1.736" long) set screw and A-2043-1 full height locknut. They claim the older affair was reported as sometimes leaking oil, but leaks would result from worn B6747 Stat-O-Seal under the other non-locking basenut (not shown in Hartzell Manual Fig 4-1), not the length of the set screw..
My A-2421 set screw fractured upon undoing the shear locknut during refurbishing of my 27yr old HC-C2YK-1BF/F7666A-4 prop. It turns out that the fracture occurred in line with the bottom of the hex (Allen) driving recess, where the set screw is the weakest. It's possible that this was over torqued at one time. The new length set screw puts the bottom of the driving recess well clear of the locknut to basenut interface.
The change is an easy one. Just order the parts from Ottosen in AZ. Make a mark between the root of a prop blade and the hub before removing the old set screw. Remove both nuts and seal. Back out the old set screw and replace it with the new one. Then install the new seal, basenut and locknut. Adjust the set screw until your prop root to hub marks align, hold the hex wrench while you seat the basenut and torque the locknut to 17ft-lb. You may need to make minor adjustments to achieve the correct low pitch rpm for your installation.
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HC-SL-61-278.pdf |
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