62-21 Bearing Replacement (continued)
6. Ensure new bearing mating surfaces are clean and smooth. Coat hub bearing bore
and hub bearing mating surfaces with epoxy primer (see Section 20-70). Do not allow
primer to contaminate Teflon portion of bearing.
7.
Refer to Figure 62-6. If seam of bearing Teflon liner is visible, orient bearing so seam
is toward top of hub (as installed on helicopter). While primer is still wet, press in new
bearing using MT329-6 plug and MT643-1 support (support is not used when pressing
in teeter hinge bearings) until bearing flange contacts hub.
CAUTION
Use MT643-1 support when installing coning hinge bearings.
Never install coning hinge bearings into unsupported hub.
8. Seal between bearing flange and hub with epoxy primer. Similarly seal between
inboard edge of bearing and hub. Do not allow primer to contaminate Teflon portion of
bearing.
9. Measure hub width across teeter and coning hinge bearing faces. Compare widths with
measurements from step 3. Any hub width increase requires calculating new stack-up
for affected hinge per Section 62-31.
10. If reinstalling hub on same helicopter, install hardware as removed in step 2, subject to
preceding step. Reinstall hub per Section 62-20.
Page 62.10 Chapter 62 Main Rotor R66 Maintenance Manual 25 OCT 2010
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