PLATE 8E1358 - Caterpillar

Centrifugal Pump
A centrifugal pump driven by a 3-phase electric motor is used to circulate the oil steadily through filters that remove debris and water contamination. Steady flow without interruptions and flow surges can be achieved by using centrifugal type pumps that maintain a uniform fluid velocity across filter elements. The steady flow of the centrifugal pump is preferred over the interrupted flow of a reciprocating pump. This uniform fluid velocity is necessary for the Filtration Procedure described below.Ultra-High Efficiency Filter Elements
Remove fine debris down to particle sizes of 6 microns and smaller to provide the cleanest possible fill oils. This cleanliness level is accomplished with filter elements designed specifically for Caterpillar. These elements have the same quality construction and excellent dirt holding capacity as the elements used on Caterpillar machines and engines.Water Removal Filter Element
Often new oils have been found to contain free and emulsified water. Water vapor may also be present in new oils. Depending on ambient conditions, the vapor may change phase and become emulsified in the oil. Water droplets in lubricating oil will interfere with automatic laser particle counters and should be removed if possible. In addition, water levels of 0.1 percent by volume may be harmful to Caterpillar machines and engines and must be removed from fill oils. The water removal element included in the filter system has been selected and placed in a location where the water removal element will work with the Ultra-High Efficiency filter elements to remove water contaminants.Water Absorbing Tank Breather
The importance of water removal is addressed above. A tank breather is necessary to allow the air motion that occurs when filling a reservoir or when using the Filtration Procedure. The breather included with the filter system will remove airborne contaminants down to 4 microns. The breather will absorb some of the moisture present due to local ambient conditions. A desiccant color indicator is used to determine when the breather needs to be changed. Breather life will vary depending on the level of contamination and moisture in the air.Filter Restriction Indicators
The filter system includes a pressure differential gauge on the ultra-high efficiency filter tank and a pop-up restriction indicator on the water removal filter housing. The indicator can be used to monitor when filter element service is required. Refer to the Tool Operating Manual, NEHS0957.3-Way Inlet and Outlet Valves
3-way valves on the centrifugal pump inlet and the return line to the non-metallic reservoir are included with the filter system. The valves can be used to change the flow path of the oil. Oil may be drawn from or returned to an external reservoir other than the tank included with the filter system. With proper positioning, the 3-way valves can be used to fill and filter oil in an extra reservoir. If the additional reservoir is another non-metallic unit, the filtration procedure below can be used for as many of these units as desired. For instruction on the proper settings for the 3-way valves refer to the owners manual and operating