TM 9-6115-604-34NAVFAC P-8-633-34b.Disassemble and Service. Unless a complete overhaul is required, disassemble main rotor assembly only to theextent required to dean, repair, or replace a dirty, damaged or defective component. Do not disassemble rotor ifcoil rewinding is required. Rewinding is performed by depot or the manufacturer. Remove, inspect and dean; orrepair main rotor assembly components and auxiliaries in accordance with the procedures below. Installcomponents in accordance with step c, below. Disassemble main rotor assembly as follows:WARNINGDry deaning solvent. PD-680, Type III, or equivalent, Is flammable and moderatelytoxic to the skin, eyes, and respiratory tract. Assure adequate ventilation. Skin,eye, and respiratory protection Is required to avoid injury to personnel.WARNINGCompressed air used for cleaning or drying can create airborne particles that mayenter the eyes. Pressure shall not exceed 30 psi (207 kPa). Wearing of goggles Isrequired to avoid Injury to personnel.(1)Coupling drive discs and spacer (22 and 24, Figure 5-1).(a) Remove. Remove coupling drive discs (22) and spacer (24) in accordance with step a, above.(b) Inspect and dean.1Inspect coupling drive discs (22) and spacers (24) for distorted or bent edges and other damage. Check for worn mounting holes. Inspect drive disc hexagonal head screws (20) for damaged threads.2Clean coupling drive discs (22) and spacers (24) with solvent PD-680, Type 111, or equivalent. Dry thoroughly with compressed air.(c) Repair. Repair by replacement of damaged components. Replace all defective discs as necessary. Replace spacers, if damaged. Replace screws if damaged.(d) Install. Install drive discs in accordance with paragraph 5-9.(2)Machining Adapter.(a) Remove. Remove the machining adapter (25, Figure 5-1) in accordance with step a, above.(b) Inspect and Clean.1Inspect the machining adapter for cracks, burred or rough mating and other damaged surfaces. Inspect the hexagon head screws (26) for stripped threads. Replace if defective.2Clean the machining adapter (25), hexagon head screws (26), and screen assembly (3) in solvent PD-680, Type III, or equivalent, to remove all dust, dirt, and grease. Dry the parts thoroughly with compressed air.(c) Repair. Repair by replacement. Replace the machining adapter (25) if damaged. Replace the hexagon head screws (26) as needed.(d) Install. Install machining adapter (25) in accordance with paragraph 5-9, step b.(3)Ball Bearing and Bearing Cap (39 and 18, Figure 5-1).(a) Inspect and Clean. inspect the ball bearing (39) for damage or wear while bearing (39) is installed on the rotor assembly (15, Figure 5-1). Inspect bearing cap for worn threads in the screw mounting holes.(b) Repair. Repair by replacement. Replace bearing cap if threads are wom.(c) Remove.NOTEIf the ball bearing is removed for any reason, always install a new ball bearing.1Remove retainer ring (38), then remove the ball bearing (39) with a general purpose puller with 20 ton (9072 kg) capacity.2Slide off bearing cap (18) from the main rotor shaft. Remove and discard oil seal (7) if bearing cap is to be removed.5-16
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