BELT TENSIONER GP 3806597 - Caterpillar

Location of O-ring seal (2) and Date Code (1) on 4N3411 Air Starter Relay Valve.Adaptable To: The part number of the improved 4N3411 Air Starter Relay Valve has not changed. The improved valve can be identified by the three letter date code stamped on the valve body. See the illustration. All valves date codes November 1989 or later have the improvements. The first letter in the date code indicates the supplier manufacturing plant; the second letter indicates the year of manufacture; and the third letter indicates the month of manufacture. Chart A provides the codes for years and Chart B provides the codes for months.
Example: A valve coded "WQH" is manufactured at the plant indicated by the letter "W". The letter "Q" indicates the year of 1990. The letter "H" indicates the month of August.
Example: A valve coded "WPL" is manufactured at the plant indicated by the letter "W". The letter "P" indicates the year of 1989. The letter "L" indicates the month of November.