(d) Clean. Clean the old grease from the bearing cap (18) and fill the bearing cap grease cavity 113 to 1/2
full of new multi-purpose lithium grease, MILT-18709. Install new oil seal (7).
(e) Install. Install new bearing cap (18) and ball bearing (39) in accordance with step c. below.
Hub (23, Figure 5-1).
(a) Inspect and dean. Inspect the drive hub (23) while mounted on the main rotor assembly. Check the
hub for cracks or stripped drive disc screw mounting holes.
(b) Repair. Repair damaged or defective hub by replacement. Install replacement hub in accordance with
step c, below.
1 Match-mark the fan (55) and hub (23) for alignment to ensure proper balance after reassembly.
Mark the replacement hub (23) in the same place as the old hub relative to the keyway.
2 Remove the fan mounting hardware, hexagon head screws (53), and belleville washers (54) and
move the fan (55) back away from hub (23).
3 Install a suitable puller on the hub (23).
4 Remove the setscrew (56) in the hub (23) over the hub key (57).
Failure to exercise caution when heating components using a torch may result In
Injury to personnel.
5 Using a torch, rapidly heat the hub at the outer diameter while tightening the puller. This must be
done rapidly before the heat can expand the shaft. Remove the hub (23) using heat resistant gloves.
Fan (55, Figure 5-1).
Dry deaning solvent, PD680, Type 1II, or equivalent Is flammable and moderately
toxic to the sin, eyes, and respiratory tract. Assure adequate ventilation. Skin,
eye, and respiratory protection Is required to avoid Injury to personnel.
Compressed air used for cleaning or drying can create airborne particles that may
enter the eyes. Pressure shall not exceed 30 psi (207 kPa). Wearing of goggles Is
required to avoid Injury to personnel.
1 Check fan (55) for cracks or blades while installed on the rotor.
2 Clean the fan, using solvent PD-680, Type III, or equivalent Dry with compressed air.
(b) Repair. Replace damaged or defective fan (55). Install in accordance with step c, below.