SHAFT 5S6978 - Caterpillar

A coupling assembly with serviceable silicone blocks is used to transmit power from the engine to the generator.
Illustration 1 g06335419
Typical silicone compression flexible coupling
(1) Coupling assembly
(2) Cover plate
(3) Silicone blocks
(4) Inner member
(5) Outer memberA coupling with serviceable silicone blocks is used to transmit power from the engine to the generator.
Remove the coupling cover plate (2)
Inspect the outer visible silicone blocks (3) for excessive wear and deterioration. If the silicone blocks show excessive wear, replace the silicone blocks. If blocks require replacement, replace all blocks as a complete set. If any of the blocks are removed during inspection, the blocks must be returned to the original sequence and location within the coupling. If the blocks are not returned to the original location and sequence, shorter coupling life may occur due to uneven loading of the blocks.Some visible wear and discoloration of the blocks is normal. The power is transmitted through the leading blocks. The leading blocks are constantly under compression while the engine and the generator are running. The trailing blocks are not under compression and may rotate during engine operation. The two types of blocks will wear differently and this wear is normal. Silicone block discoloration from blue to gray or black is normal. The discoloration does not indicate that the blocks have been overloaded or that the blocks have suffered excessive wear.When reassembling the coupling, clean the silicone blocks before installation with 5N-5561 Silicone Lubricant. Clean the cavities in the coupling with 5N-5561 Silicone Lubricant. The silicone lubricant can be used in small quantities to aid in the assembly of the coupling. Do not use a petroleum-based agent. After the inspection is complete, assemble the coupling cover plate (2).