Usage:
Caterpillar Machines Powered By 3408E Or 3412E Engines Equipped With HEUI
The 3408E and 3412E Engines in these machines are equipped with a 129-0372 Primary Fuel Filter/Water Separator Assembly. See the illustration. The primary fuel filter/water separator assembly consists of a 129-0373 Element and a 129-0375 Bowl. The element includes the larger upper beveled seal (A) and the smaller lower seal (B). The bowl includes the smaller lower seal (B).
Components of the 129-0372 Primary Fuel Filter/Water Separator Assembly. 129-0373 Element (1). 129-0375 Bowl (2). Larger upper beveled seal (A). Smaller lower seal (B). Drain valve (C).
The water from the fuel accumulates in the bowl. Drain valve (C) is part of the bowl. The drain valve allows any water that accumulates in the bowl to be drained. If the water is not drained when the bowl becomes full, an increased resistance to fuel flow will result.
NOTE: Fuel quality is very important. The fuel supply should be maintained properly and kept free of contamination by water and sediment. Water contamination of the fuel can be minimized by obtaining fuel from reliable sources and by draining the fuel tank regularly.
The Maintenance Schedule for the 129-0372 Primary Fuel Filter/Water Separator Assembly follows:
- * Every 10 hours of operation or daily, drain the water separator bowl and drain water and sediment from the fuel tank.
- * Every 500 hours of operation or every three months, replace the primary fuel filter/water separator element (use a 129-0373 Element).
NOTE: It is still necessary to service the secondary fuel filter element as follows: Every 250 hours of operation or monthly, replace the secondary fuel filter element (use a 1R-0749 Element).