12-12 Filter Replacement
Refer to R66 Illustrated Parts Catalog (IPC) Figure 63-13.
NOTE
Replace main rotor gearbox oil every 600 hours. When
replacing a filter after new or overhauled main rotor gearbox
has accumulated 100 hours, replacing oil is not required.
1. Drain main rotor gearbox oil per Section 12-11, if required.
2. Cut and discard safety wire securing bowl & indicator assembly to head assembly.
Unscrew bowl and remove and discard element. Remove o-ring and back-up ring from
head assembly.
3. Clean and dry bowl assembly; install new F651-3 seals kit and F651-2 element.
4. Hand-tighten bowl assembly until tight against head assembly. Install 0.032-inch
diameter lockwire and safety bowl to head.
5. Service main rotor gearbox per Section 12-11.
12-13 Chip Detector and Sight Gage
A. Removal
1. Refer to Figure 12-1. Disconnect chip detector wiring, as required. Remove chip
detector from housing.
NOTE
Remove chip detector housing and inspect for obvious damage
if housing leaks.
2. Drain main rotor gearbox oil per Section 12-11, if removing chip detector housing or
sight gage. Remove housing and/or gage as required.
B. Cleaning Chip Detector (and Housing)
1. Scrub chip detector (and housing, if applicable) with a toothbrush and approved
solvent per Section 20-70. To remove debris, use compressed air or masking tape;
do not use a magnet. Dry chip detector with compressed air or a lint-free cloth.
2. Refer to Figure 12-1. Connect chip detector electrical wiring and special torque
terminal nut per Section 20-33. Turn BATTERY switch ON and ground detector’s
central magnetic probe to airframe. Verify appropriate CHIP warning segment
illuminates. Turn BATTERY switch OFF.
SEP 2012 R66 Maintenance Manual Chapter 12 Servicing Page 12.3
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