65-41 Output Shaft Seal Replacement
Refer to R66 Illustrated Parts Catalog (IPC) Figure 65-13.
1. Remove tail rotor assembly per Section 64-10.
2. Remove hardware securing push-pull tube assembly to bellcrank assembly.
3. 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.
4. Cut and discard safety wire securing C112-2 cap retaining hardware. Remove hardware
securing cap to gearbox and remove cap with C966-2 seal and C215-133 o-ring.
CAUTION
Do not remove shims between cap and gearbox assembly.
Shims control output shaft drag.
5. Using hydraulic press, press old seal from cap. Remove and discard o-ring. Clean and
dry cap, especially seal seating surface and o-ring groove.
6. Verify open face of seal points toward gearbox and press new seal into cap bore 0.160
inches from external surface. Lightly coat new o-ring with A257-22 oil and install in
cap.
7. Lightly coat output shaft seal seating area with A257-22 lubricant and slide cap onto
shaft. Install hardware securing cap to gearbox and special torque bolts per Section 20-
33. Install 0.032-inch diameter lockwire through hardware and safety in pairs.
8. Slide (assembled) bellcrank assembly, pitch control assembly, and pitch links onto
gearbox output shaft. Shim pitch control per Section 67-62, as required.
9. Install hardware securing push-pull tube assembly to bellcrank. Standard torque fastener
per Section 20-32 and torque stripe per Figure 5-1.
10. Install tail rotor assembly per Section 64-10.
SEP 2012 R66 Maintenance Manual Chapter 65 Tail Rotor Drive System Page 65.11
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