63-20 Main Rotor Gearbox Assembly (continued)
B. Installation
1. Refer to R66 Illustrated Parts Catalog (IPC) Figure 63-3. If installing new C653-3 (aft)
or A653-2 (forward) rubber mounts, lubricate mounts using water or A257-8 lubricant
and press into gearbox ears.
2. Refer to § 7-20. Hoist F006-1 main rotor gearbox (with hydraulic installation, G201-
1 [servo support] frame assembly, and mast fairing assembled) into helicopter, onto
F020-1 upper frame assembly.
3. Install F252-1 strut and F235-13 strut assemblies, and install hardware securing strut
assemblies to upper frame. Install gearbox mounting bolts and associated hardware,
and apply light coat A257-9 anti-seize to threads. Special torque mounting bolts per
§ 20-33, standard torque bolts securing struts to upper frame per § 20-32, and torque
stripe per Figure 5-1.
4. Remove hoisting equipment, and lifting fixture or nylon rope.
5. Install Tygon® tube on G254-1 (fuel) vent assembly and install D277-8 clamp. Verify
security.
6. Install hardware securing A936-3 (ground) wire assembly to F560-1 bulkhead assembly.
Connect F059-01 cabin harness assembly plug to F049-01 gearbox harness assembly
receptacle.
7. Remove caps and plugs and connect D205-19 and D205-20 hose assemblies to
gearbox and D500-3 oil pump. Using back-up wrench, special torque hose nuts per §
20-33, and torque stripe per Figure 5-1.
8. Attach (rotor brake) D126-2 cable assembly to (rotor brake assembly) B112-3 spring.
Verify 0.25 inch minimum clearance between cable assembly and vent assembly
Tygon® tube; adjust cable attachments as required.
9. Install 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.
Standard torque hardware per Section 20-32 and torque stripe per Figure 5-1.
10. Install hardware securing F908-1 and F910-1 yoke assemblies to plate assemblies,
as removed. Shim engine driveline per § 63-11, and tail rotor driveline per § 65-30.
Standard torque nuts and palnuts per § 20-32, and torque stripe per Figure 5-1.
11. Install tailcone cowling assembly per § 53-23.
12. Install main rotor blades per § 62-10.
CAUTION
Prior to operation of a new, overhauled, or repaired main rotor
gearbox, inject 5-6 ounces A257-22 oil into mast tube vent
hole. Service gearbox per § 12-11.
MAY 2015 Chapter 63 Main Rotor Drive System Page 63.7
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