65-40 Tail Rotor Gearbox Assembly
Refer to R66 Illustrated Parts Catalog (IPC) Figure 65-9.
A. Removal
NOTE
Drain tail rotor gearbox oil per § 12-21 prior to gearbox removal,
or keep gearbox vertical after removal to avoid oil escape thru
filler-vent plug.
1. Remove hardware securing push-pull tube assembly to bellcrank assembly.
2. As required, remove tail rotor assembly per § 64-10. As required, remove hardware
securing bellcrank to tail rotor gearbox assembly output cartridge. Slide (assembled)
bellcrank, pitch control assembly, and pitch links off of gearbox output shaft.
3. Remove hardware securing A558-2 cover to tailcone and remove cover.
4. Support aft end of D224 drive shaft assembly, and remove hardware securing gearbox
input yoke to aft C947-3 plate assembly, noting hardware removed.
5. Cut and discard ty-raps as required and disconnect chip detector wiring at plastic
connector.
6. Remove hardware securing gearbox to tailcone casting and remove gearbox.
B. Installation
1. Position tail rotor gearbox assembly on tailcone casting and install mounting hardware.
Special torque screws per § 20-33 and torque stripe per Figure 5-1.
2. Connect chip detector wiring at plastic connector and install ty-raps, as required.
Cinch ty-raps until snug without over-tightening, and trim tips flush with heads.
3. Install hardware securing gearbox input yoke to aft C947-3 plate assembly, and remove
support. Shim tail rotor driveline per § 65-30. Standard torque bolts per § 20-32 and
torque stripe per Figure 5-1. Install A558-2 cover.
4. If removed, slide (assembled) bellcrank assembly, pitch control assembly, and pitch
links onto gearbox output shaft. Install hardware securing bellcrank to gearbox output
cartridge. Standard torque bolts per § 20-32 and torque stripe per Figure 5-1. Shim
pitch control per § 67-62, as required.
5. Install hardware securing push-pull tube assembly to bellcrank. Standard torque
fastener per § 20-32 and torque stripe per Figure 5-1.
6. If removed, install tail rotor assembly per § 64-10.
7. Service tail rotor gearbox per § 12-21, as required.
Page 65.10 Chapter 65 Tail Rotor Drive System MAY 2015
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