BUCKET AR-GRAPPLE 2176229 - Caterpillar

Generator Set:
3456 GEN SET (S/N: GHJ1-UP)
Description of Change: Some 3456 Engines have been experiencing issues with surging of the engine. The surging of the engine may have two possible causes. New software may be needed to resolve the issue. The other possible cause for the surging of the engine may be a damaged check valve.Adaptable To: New software is now available to deal with the surging of the engine. First, install 262-8911 Electronic Software Gp if the engine is experiencing surging of the engine. 262-8911 Electronic Software Gp is now available on the Service Information System (SIS) for 3456 Engines.Refer to Special Instruction, REHS3790, "E Stop Indication on EMCPII and EMCPII with ADEM II and III Electronic Control Modules (ECM)" if the engine still continues to surge after the 262-8911 Electronic Software Gp has been installed. Special Instruction, REHS3790, "E Stop Indication on EMCPII and EMCPII with ADEM II and III Electronic Control Modules (ECM)" provides the proper information on inspecting the check valve, and replacing the check valve if necessary.