GEAR GP-FRONT 8N7174 - Caterpillar

your initial parts order to not exceed 9% of dealership population. This is an inital order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.
ACTION REQUIRED
Change aftercooler group at 500 hours (prior to failure) per rework procedure REHS3820. This rework provides the permanent corrective action and is not to be repeated.
**NOTE**
In order for this rework procedure to be claimed, the engines must have a raw water strainer installed as per the Caterpillar Application and Installation Guidelines for Cooling Systems (LEBW4978). The dealer MUST provide pictures and cut sheets of the raw water strainer installed by serial number to Chenette_Chris.
Seawater Strainers (from LEBW4978)
Strainers are required in order to protect the seawater pump, aftercooler, heat exchanger, and other cooling system components from foreign material in the seawater. The foreign material can plug and/or coat heat transfer surfaces, causing overheating of the engine and shortened life of components. If the foreign material is abrasive, it will erode pump impellers and soft metal parts, reducing their effectiveness.
Seawater strainers should be installed below the water line and as close to the seawater inlet or sea chest as possible. The strainers should also be installed adjacent to the sea cock and before the first component of the cooling system.
The strainer must be installed so it can be easily cleaned, even in the worst weather conditions.
Although simplex strainers will adequately protect the engine, they require the seawater flow to be shutoff during servicing. Duplex strainers can be cleaned without interrupting seawater flow or engine power and greater safety will result.
It is strongly recommended to use a serviceable strainer in order to allow frequent cleaning.
Appropriately sized strainers will impose no more than 9 kPa (3 ft H2O) restriction to flow at full seawater flow conditions. Suppliers can help in the proper selection of strainer size by providing the flow restriction of each size of strainer at varying water flow conditions.
Strainer media of 2.0 mm (0.079 in) diameter hole size or less is required. Strainer media of 1.6 mm (0.0625 in) diameter hole size is recommended in applications where sea grass and/or other debris are present, or cases when plugging of engine cooling components persists with the use of 2.0 mm diameter
media.
Schools of small fish, ice chips, and floating debris such as plastic bags and plant material can plug a clean strainer in a few seconds. When this happens, the differential pressure across the strainer will rise. This is an indication that the strainer should be cleaned. A differential pressure switch will provide early warning of strainer plugging and resultant loss of engine cooling. In time, high engine water temperature alarms will also warn of a loss of seawater flow, but the differential pressure sensor will give early warning and the precise location of the problem. Even with a differential pressure sensor, best practice is to clean the strainer frequently in order to ensure optimum engine performance and
reduce stress on the cooling system components.
SERVICE