HEAD 9T2678 - Caterpillar

Two Bearing Flexible Coupling Removal
Start By:
Remove the terminal box and generator if needed. Refer to Systems Operation Testing and Adjusting Disassembly and Assembly, SENR5359, "Generator - Remove" for a generic description to remove the terminal box and generator.Note: The coupling may be serviced without the complete removal of the generator if desired. The generator can be pushed rearward on the generator set base rail. After the generator is pushed away from the engine, there should be enough clearance to service the coupling if desired.Remove the Rubber in Shear Type of Coupling
Note: The flexible coupling does not require disassembly when removing the generator. The inner flexible element will slide out of the outer coupling ring as the generator is pushed away from the engine.
Illustration 1 g01578214
Rubber in Shear Type Coupling (1) Outer Ring (2) Rubber Flexible Element (3) Hardness Specification
Remove the outer ring mounting bolts for the coupling. If necessary, remove the outer ring of the coupling from the engine flywheel.Note: Care must be taken in the process of removing the ring. The ring may need to be pried off.
Remove the mounting bolts for the inner member of the coupling. Carefully pry the rubber flexible element flange of the coupling from the generator hub.Note: The coupling flexible element components weigh approximately 22.7 kg (50 lb). The outer ring weight is approximately 5 kg (11 lb).Generator Drive Hub Removal
Care must be taken to avoid damage to the main rotor shaft of the generator.
Note: The drive hub is a heavy shrink fit installation. If the hub cannot be removed by heating, then the destructive method may be used.The following procedure is written to provide information for the removal and installation of the drive hub (10) for the SR4 generators. The following procedure applies to two bearing generators.
Illustration 2 g03327768
(10) Drive hub machined face (11) Main rotor shaft
Always wear protective gloves when handling parts that have been heated.
The exact process and tooling for each application may vary. That is, the process that is documented in this publication was performed on a generator that was removed from the engine. If the generator is left on the generator base rails for servicing, the working distance will determine the puller assembly that can be used.Even if the generator is moved away from the engine as far as possible, but left on the generator base rails, the working distance may not provide enough working space for the puller that is written about in this publication.Important Safety Information
Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs.A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools in order to perform these functions properly.Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other