| Compartment | Maintenance Interval | Recommended Sampling Interval | Sampling Valve | Fluid Type |
| Engine | 250 Hours (1) | 250 Hours | Yes | DEO |
| Eccentric Weight Housing | 3000 Hours | none | No | Synthetic ISO 220 |
| Hydraulics | 1000 Hours (1) | 500 Hours | Yes | HYDO |
| Axle Oil | 1000 Hours | 500 Hours | No | MTO |
| Final Drive Planetary (Axle) | 1000 Hours | 1000 Hours | No | MTO |
| Vibratory Support Housing | 1000 Hours | 500 Hours | No | GO |
| Final Drive Planetary (Drum) | 1000 hours | 500 Hours | No | Synthetic ISO 220 |
| Coolant | 6000 hours | 500 Hours | Yes | ELC |
| ( 1 ) | Change both the oil and the oil filter. |
Consult your Caterpillar dealer for complete information and assistance in establishing an S·O·S program for your equipment.
More Frequent S·O·S Sampling Improves Life Cycle Management
Traditionally, the suggested S·O·S sampling intervals have been at each oil change, 250 hours for engines, or every 500 hours for all other compartments. Under the following conditions, a sampling interval of 250 hours is recommended for all compartments.
Application
A 500 hour sampling interval may not give an advance notice of failures in some high load conditions and in some high temperature conditions. A 250 hour sampling interval provides more data between oil change intervals. This increases the chance for detecting a possible failure.
Determining Optimal Oil Change Intervals
Sampling compartments at every 250 hours provides information on oil performance in order to determine the best utility of a particular oil. Sampling more often can allow closer monitoring of component wear rates. For detailed information on extending oil change intervals, please see your Caterpillar dealer.
Optimizing The Component Life Cycle
A decreased sampling interval provides better trends of data. A decreased sampling interval enables close monitoring of wear patterns on components. This will ensure full component life.
Location of the Sampling Valves
Refer to the Operation and Maintenance Manual, "Maintenance Section" for information regarding the location of the sampling valves.