MAY 2015 Chapter 63 Main Rotor Drive System Page 63.9
63-21 Yoke and Seal Replacement (continued)
C. (Engine-Driven) F910-1 Yoke Assembly and Seal Removal
1. Remove tailcone cowling assembly per § 53-23. Remove engine cowling assembly
per § 53-21.
2. Refer to Figure 63-1. Remove hardware securing A947-2 (forward) plate assembly
to F910-1 yoke assembly, and A947-2 (aft) plate assembly to F642-1 shaft
weldment, noting hardware removed. Support weldment to allow clearance for
yoke removal.
3. Place a wood block between firewall and yoke flange (to prevent yoke from rotating)
or engage rotor brake. Remove nut and washer securing yoke to pinion, then
remove yoke.
4. Remove rotor brake per § 63-30.
5. Remove F255-1 cover with C966-8 seal, but do not remove shims under pinion
bearing. Remove F266-2 spacer.
6. Using hydraulic press, press old seal from cover.
D. (Engine-Driven) F910-1 Yoke Assembly and Seal Installation
CAUTION
Do not remove shims under pinion bearing. Shims control
bearing preload and gear backlash.
1. Refer to Figure 63-1. Replace A215-025 o-ring, as required.
2. Clean and dry F255-1 cover; verify open face of seal points toward gearbox and
press in new seal until completely seated.
3. Replace A215-152 o-ring, as required. Install cover assembly over pinion shaft.
Install F266-2 spacer.
4. Install rotor brake per § 63-30.
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