21-20 Air Conditioning
21-21 Compressor Assembly
Refer to R66 Illustrated Parts Catalog (IPC) Figure 21-3.
A. Belt Replacement
1. Remove tailcone cowling per § 53-23.
2. Remove hardware securing F196-1 tail rotor drive fan shaft to C947-3 plate
assemblies, noting hardware removed.
3. Loosen hardware securing G777-1 compressor assembly to G781-1 arm weldment.
CAUTION
Do not use refrigerant hose assemblies or fittings to rotate
compressor. Do not rotate compressor further than necessary,
to avoid damaging system wiring and refrigerant hoses or
fittings.
4. Rotate compressor down and inboard as required to disengage B173-5 v-belt from
pulleys. Route belt around drive shaft flange and remove belt.
5. Route new B173-5 v-belt around drive shaft flange and fit belt onto G779-1 pulley
and compressor pulley.
6. Rotate compressor up and outboard to tension belt, then tighten hardware securing
compressor to weldment. Adjust belt until 4.5-5.5 lb of force applied mid-span
deflects belt 0.16-inch. Standard torque bolts per § 20-32 and torque stripe per
Figure 5-1.
7. Install hardware securing drive shaft to plate assemblies, as removed. Standard
torque bolts per § 20-32 and torque stripe per Figure 5-1.
8. Install tailcone cowling per § 53-23.
MAY 2015 Chapter 21 Environment Control Page 21.5
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