CFM56-7 Shaft Seal Repair

Engine Pump Repairs

Hangar Repair Solution for CFM56-7 Shaft Seals (SB 828300-73-111)

Eaton’s expansive product portfolio includes the main engine fuel pump for CFM56-7 engines. In 2008, Eaton revised the CFM56-7 shaft seal to eliminate frequent, low-volume leaks. While the revision achieved its goal, the shaft seal began to experience occasional heavy-volume leaks due to unexpected axial movement during engine shutdown and startup cycles.

Working closely with our OEM partners, Eaton developed a cost-effective upgrade solution that eliminates the potential for axial motion and provides increased closing force. To support the timely and cost-effective implementation of this improvement, Eaton and CFM agreed to allow upgrades to be performed in a hangar environment.

This Eaton training video demonstrates how to install the new shaft seal for Service Bulletin 828300-73-111 and provides advice regarding your decision to incorporate the change in a hangar environment. Eaton recommends that operators watch the video in its entirety and decide if local installation of the shaft seal right for you.

For more information about this training video or CFM56-7 shaft seal replacement, please send an inquiry to: