25 OCT 2010 R66 Maintenance Manual Chapter 62 Main Rotor Page 62.7
62-20 Main Rotor Hub
Refer to R66 Illustrated Parts Catalog (IPC) Figure 62-3.
A. Removal
1. Remove main rotor blades per Section 62-10.
2. Refer to Figure 62-2. Mark rotor hub using a grease pencil or soft marker as follows:
a. Indicate nut side of teeter bolt.
b. Indicate chord arm side of drive shaft.
3. Remove cotter pin, nut, thrust washers, C117 shims, C106 journals, and bolt. Rotate
hub as required and remove hub. Do not drop C152 thrust washers or C106 journals.
4. Reinstall bolt, thrust washers, shims, journals, and nut in rotor hub exactly as removed.
CAUTION
Main rotor chordwise balance is adjusted using C106 journals
and C117 shims. If assembly stackup is altered, an out-of-
balance condition can occur.
B. Installation
1. Clean and dry teeter hinge hardware using approved solvent per Section 20-70. Inspect
journals and thrust washers for chipping of chrome plating, corrosion, and/or wear
grooves extending through chrome plating (0.0006 inch maximum wear). Replace
journal or thrust washer if any of these conditions exist.
2. Line up mark on hub with chord arm on rotor shaft.
3. Refer to Figure 62-2. Reinstall teeter hinge bolt, thrust washers, shims, and journals
exactly as removed. If previously installed information is unavailable, perform teeter
hinge journal and shim calculation per Section 62-31. Ensure journals are clear of droop
stops and fully contact drive shaft.
4. Coat nut face and bolt threads with A257-9 anti-seize compound, install and tighten
nut, then loosen nut until both thrust washers can be freely rotated.
WARNING
Do not allow anti-seize compound to contaminate drive shaft,
journals, shims, or thrust washer inner faces. Contamination
prevents proper joint clamp-up and may cause failure.
5. Position MT122-6 main rotor bolt stretch tool on teeter bolt per Figure 62-4. Zero and
lock dial indicator. Remove tool.
To Next Page
Loading...