62-32 Adjusting Hinge Friction
A. Teeter Hinge Adjustment
NOTE
Teeter hinge friction must be checked and adjusted with main
rotor blades removed from main rotor hub. If required, remove
main rotor blades per Section 62-10.
Teeter hinge friction is adjusted by changing C117 shim stack in small increments.
NOTE
If shim stack is changed per following instructions, a new bolt and
nut must be installed per Section 62-10 Part B, steps 3 thru 5.
1. Refer to Figure 62-7. Install MT354 teeter moment tool into main rotor hub coning
hinge bearings. Using a spring scale, measure force required to teeter main rotor
hub; use sliding force reading, not breakaway reading. Force required to teeter main
rotor hub must be:
Minimum: No axial play
Maximum: 19 pounds
2. Refer to Figure 62-2. Remove cotter pin and teeter hinge nut. Remove thrust
washer and C117 shims under nut.
3. Refer to Table 62-1. Measure thickness of C117 shims under teeter hinge nut.
Change shims as necessary to adjust friction. Reducing shim stack-up by 0.003 -
0.005 inch will increase teeter friction. Increasing shim stack-up will reduce teeter
friction.
4. Reassemble teeter shims, thrust washer, and nut. Repeat step 1. Torque teeter
hinge bolt per Section 62-20 Part B steps 4 thru 6 and check teeter friction often
while stretching bolt. Do not exceed maximum teeter hinge friction. If required,
increase shim stack-up per preceding step so proper bolt stretch is reached prior to
maximum friction.
5. Cotter pin holes in nut and bolt will not align. Remove teeter hinge bolt by pressing
it out with an old bolt. Install a new bolt and nut per Section 62-10 Part B, steps
4 thru 6. Drill new bolt and nut per Section 62-33; coat new cotter pin with epoxy
primer and install wet.
6. If required, install main rotor blades per Section 62-10.
25 OCT 2010 R66 Maintenance Manual Chapter 62 Main Rotor Page 62.15
To Next Page
Loading...