63-20 Main Rotor Gearbox Assembly
A. Removal
1. Remove main rotor blades per § 62-10.
2. Remove tailcone cowling assembly per § 53-23.
3. Disconnect (pitot system) 15-4-N-O union near G201-1 (servo support) frame assembly.
Cap fitting and plug line.
4. Refer to Figure 63-1. Remove hardware securing F908-1 and F910-1 yoke assemblies
to plate assemblies, leaving plates attached to shaft weldments. Note hardware
removed.
5. Refer to R66 Illustrated Parts Catalog (IPC) Figures 67-19 and 67-29. Remove
hardware securing F121-7 push-pull tube assembly to F339-1 jackshaft weldment,
and F121-5 push-pull tube assemblies to D212-5 servo assemblies.
6. Refer to R66 IPC Figure 63-9. Detach cable assembly from (rotor brake assembly)
B112-3 spring.
7. Refer to R66 IPC Figure 63-9. Using back-up wrench, disconnect D205-19 and D205-
20 hose assemblies from F006-1 main rotor gearbox and D500-3 oil pump. Cap and
plug fittings and hoses.
8. Disconnect F059-01 cabin harness assembly plug from F049-01 gearbox harness
assembly receptacle. Remove hardware securing A936-3 (ground) wire assembly to
F560-1 bulkhead assembly.
9. Remove D277-8 clamp or cut and discard safety wire securing Tygon® tube to G254-1
(fuel) vent assembly, and clear tubing from workspace.
10. Install hoisting equipment per § 7-20, Part A, steps 1 thru 4; remove hoist slack.
11. Refer to R66 IPC Figure 53-13. Remove hardware securing F252-1 strut to F020-1
upper frame assembly. Remove (mounting bolt) nuts and washers securing gearbox to
upper frame. Remove aft mounting bolts securing F235-13 strut assemblies to servo
support frame, hardware securing struts to upper frame, and struts.
12. Hoist gearbox (with hydraulic installation, servo support frame, and mast fairing
assembled) up and away from helicopter.
Page 63.6 Chapter 63 Main Rotor Drive System MAY 2015
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