Page 65.12 Chapter 65 Tail Rotor Drive System R66 Maintenance Manual SEP 2012
65-42 Input Shaft Seal Replacement
Refer to R66 Illustrated Parts Catalog (IPC) Figure 65-13.
1. Remove tail rotor gearbox per Section 65-40. Tail rotor assembly and pitch control
assembly removal are not required.
2. Remove and discard cotter pin securing tail rotor input yoke retaining nut. On a suitable
work bench, place a wood block between yoke and gearbox housing to prevent tail rotor
rotation; remove castellated nut, washer, and yoke.
3. Cut and discard safety wire securing C112-1 cap retaining hardware. Remove hardware
securing cap to gearbox and remove cap with A966-3 seal and C215-140 o-ring.
CAUTION
Do not remove C141-2 washer between cap and bearing.
4. 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.
5. Verify open face of seal points toward gearbox and press new seal into cap bore 0.25
inch from external surface. Lightly coat new o-ring with A257-22 oil and install in
cap.
6. Install cap, and hardware securing cap to gearbox; special torque bolts per Section 20-
33. Install 0.032-inch diameter lockwire through hardware and safety in pairs.
7. Install input yoke, washer, and castellated nut onto gear shaft. Place wood block
between yoke and gearbox housing to prevent tail rotor rotation, special torque nut per
Section 20-33, and install new MS24665-210 cotter pin.
8. Install tail rotor gearbox per Section 65-40.
To Next Page
Loading...