PISTON AS 9T8442 - Caterpillar

Two Bearing Generator Flexible Coupling Removal
Start By:
Remove the terminal box. Refer to Systems Operation, Test and Adjust, Disassembly and Assembly, KENR5284, "Terminal Box - Remove" section.
Remove the generator. Refer to Systems Operation, Test and Adjust, Disassembly and Assembly, KENR5284, "Generator - Remove" section. 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).Remove the Rubber in Compression Type Coupling
Illustration 2 g01578343
Exploded View of the Coupling
(4) Cover plate
(5) Silicone blocks
(6) Inner hub
(7) Outer hub
Illustration 3 g01578539
(10) Coupling assembly
(11) Outer hub mounting bolts
(12) Engine flywheel
(13) Engine flywheel housing
The coupling should remain attached to the generator hub as the generator is removed. Remove the mounting bolts (11) that assemble the coupling to the engine flywheel (12). Note: If there is no need to service or to inspect the inner silicone blocks (5), then do not disassemble the coupling.
Remove the generator. Refer to the "Generator - Remove" section of this publication.
Install a link bracket (15) on the coupling. Use a suitable lifting device in order to support the coupling. Remove the inner element mounting bolts. Remove the complete coupling assembly. Refer to Illustration 4.
Illustration 4 g01596192
Set the coupling assembly with the flywheel flange down toward the floor if the following are needed:
The inner silicone blocks (5) are to be replaced
The inner silicone blocks are to be inspectedRemove the rear cover plate (4).
Pull out the silicone blocks or gently pry out the silicone blocks. Do not use any lubricant. Generator Drive Hub Removal
Care must be taken to avoid damage to the main rotor shaft of the generator.
Note: This 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 (18) for the SR5 generators. The following procedure applies to two bearing generators.
Illustration 5 g02174353
(18) Drive hub machined face
(19) Main rotor shaft The exact process and tooling for each application may vary. That is, the process