MOTOR & MTG GP-PISTON 3556032 - Caterpillar

D9N, D10, 621E, 621S, 776B Tractors;
578 Pipelayers;
973 Loaders;
627E Tractor-Scrapers, 637E Scrapers;
And 777B TrucksSUPPLEMENT: 09/24/90SERVICE MAGAZINE; MAY 28, 1990; PAGE 10; "New Coolant Flow Switch Group Has Improved Design To Provide Extended Service Life" for D8N, D9N, D10N, 621E, 621S, 776B Tractors; 578 Pipelayers; 973 Loaders; 627E Tractor-Scrapers; And 777B Trucks.Disregard this article. Make reference to the article titled "Two New Coolant Flow Switches Used On Machines Equipped With Electronic Monitoring System (EMS)" in this issue.--------------- END SUPPLEMENT ---------------Description of Change: A new coolant flow switch is used on the above models. The new switch has an extended shaft and two additional rivets to secure the paddle to the shaft. The paddle and shaft assembly on the former switch could become damaged or broken from excessive water turbulence.Adaptable To: The new 9X7088 Flow Switch Group replaces the former 6T9315, 6T9316, and 6N5284 Flow Switch Assemblies. This change is adaptable to first production.