COUPLING 4T9369 - Caterpillar

3406 (90U),
3406C (3ER),
3408 (67U),
3408B (67U11092-Up),
3408C (9ER, 78Z4867-Up),
3412 (38S),
3412C (8AR, 38S16484-Up) Industrial Engines;
3408B (78Z1144-4866),
3412 (81Z) Generator Set Engines;
3408C (1TS),
3412C (9BR) Marine Auxiliary and Generator Set EnginesDescription of Change: New fuel shutoff solenoid assemblies are available for the above engine models. Debris accumulation on the switch contacts of the former solenoid assemblies may prevent the solenoid pull-in coil from closing. This will result in a condition where the engine will not start. The new solenoid assemblies contain improvements to prevent debris accumulation on the switch contacts. A wiper seal, seated around the plunger pin, seals the switch cap area from the remainder of the solenoid. Also, a lubricant is now applied to the solenoid plunger. Additionally, the circumferential tolerance between the solenoid plunger and bore has been tightened in order to reduce the relative motion and thus reduce the creation of debris.Adaptable To: The new 173-7001 and 173-6996 Solenoid Assemblies are direct replacements for the former 7W-6551 and 7X-1075 Solenoid Assemblies, and can be retrofitted for the models listed above. Production effectivities of the new models are identified within the following chart.