HUB-PULLEY 7C8450 - Caterpillar

Introduction
The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.Problem
Issues of cavitation have been reported with the main hydraulic pump on certain 330C Excavators. The cavitation may be caused by the air that is entering the hydraulic system through the hydraulic oil cooling system.Solution
If you replace the main hydraulic pump or if you rebuild the main hydraulic pump on any 330C Excavator, you should replace the shaft seal that is used in the fan pump and you should rework the suction line for the fan.ReferenceFor additional information concerning the new seal for the fan pump, refer to Service Magazine, SEPD0844 03 July, "A New Seal in a New Gear Pump Group Prevents Leaks".ReferenceFor additional information concerning the hose assembly for the fan pump suction line, refer to Service Magazine, SEPD0880 19 March, "A New Hose Assembly for the Fan Pump Suction Line is Available".