156722-1220 ZEXEL 9 423 610 691 BOSCH FLYWEIGHT 9423610691 1567221220 me727590

Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.
The following changes are adaptable to the products within the listed serial numbers, and are effective with all products after the listed serial numbers.The new and former parts and listed in Table 1.
Table 1
Qty New Part Number Part Name Former Part Number
2 303-1968 Gasket 303-1968
4 346-0335 Band Clamp 346-0335
4 536-5400(1) Plate N/A
2 549-2046(2) Clean Emissions Module Ar 536-3638
536-3639
(1) The 536-5400 Plates are used to rework the 536-3638 Catalytic Converter Gp (Left-Hand) and the 536-3639 Catalytic Converter Gp (Right-Hand).
(2) The new 549-2046 Clean Emissions Module Ar is universal and can be installed on both sides of the engine.Inspect the 536-3638 Catalytic Converter Gp (Left-Hand) and the 536-3639 Catalytic Converter Gp (Right-Hand) for cracks before replacing the DOCs. If no cracks are present during inspection, the two 536-5400 Plates can be welded to the top of each DOC for support. Refer to special instruction for the complete list of parts and rework instructions.Note: If the 536-3638 Catalytic Converter Gp (Left-Hand) and the 536-3639 Catalytic Converter Gp (Right-Hand) are reworked, install the DOCs back into the original position. The DOCs are not interchangeable.The special instruction is available through the normal literature distribution system. The publication can also be found on the Caterpillar Service Information System (SIS).