There are two ways to obtain S·O·S oil samples. The following methods are listed in the order that is preferred:
- Use an in-line sampling valve for pressurized oil systems.
- Use a sampling gun that is inserted into the sump.
Use of the in-line sampling valve is the preferred method. This method provides samples that are less likely to be contaminated. Whenever you obtain the samples, obtain the samples from the same point. This makes the samples more representative of the oil that is in the system.
In-line sampling valves cannot be used on nonpressurized oil systems such as differentials and final drives. Use of the sampling gun is the preferred method for nonpressurized oil systems.
See the Operation and Maintenance Manual, "Maintenance Interval Schedule" for the proper interval.
The S·O·S analysis is composed of four basic tests:
- Wear metal analysis
- Infrared analysis for oil condition
- Tests for contamination of the oil by fuel, by water, and/or by antifreeze
- Particle Count for hydraulics, transmissions and other gear compartments.
Consult your Caterpillar dealer for complete information and assistance about the S·O·S oil analysis program.