PLATE 7V4665 - Caterpillar

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Sampling port for the engine
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Sampling port for a standard transmission
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Sampling port for a power shift transmission
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Sampling port for the hydraulic system
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Sampling port for the front axle
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Sampling port for front final drive
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Sampling port for the rear final drive
Table 1
Compartment     Recommended Oil Change Interval (1)     Recommended Sampling Interval     Sampling Valve     Oil Type    
Engine     500 Hours (2)     250 Hours     No     DEO    
Transmission     1000 Hours     500 Hours     No     TDTO    
Hydraulics     2000 Hours     500 Hours     Yes (3)     HYDO    
Front Differential, Front Final Drives and Rear Final Drives     2000 Hours     500 Hours     No     TDTO    
( 1 ) These are recommended intervals. Refer to the results fo the S O S oil analysis to determine if the oil change interval should be increased or decreased.
( 2 ) If the API category is less than CG-4, the oil change interval should be changed to 250 hours. If the sulfur content is greater than 1.5% by weight, the oil change interval should be changed to 250 hours.
( 3 ) The sampling valve needs to be installed. Refer to Special Instruction, SEBF8333, "Backhoe Loader S O S Sampling Valve and Filter Cart Installation Procedure" in order to install the sampling valve. Otherwise, obtain the sample from the fill tube of the hydraulic tank.The rear differential is not sampled due to the inboard brakes. S O S oil analysis would indicate a high level of contaminates that is common with inboard brakes.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. However, under the following conditions, a sampling interval of 250 hours for all compartments is recommended.Application
Studies have revealed, that in some high load/high temperature applications, 500 hours between oil samples is too long of an interval for timely prediction of potential failure modes. A 250 hour sampling interval provides more data points between oil change intervals thus increasing the odds for detecting a potential failure.Determining Optimal Oil Change Intervals
Sampling compartments every 250 hours also provides oil condition/performance information to ascertain the optimal utility of a particular oil. Also, more data points enable close monitoring of component wear rates while obtaining maximum lubrication utility. For detailed information on extending oil change intervals, please contact your Caterpillar dealer.Optimizing Component Life Cycle
An increased sampling frequency also provides better defined data trends from one oil change interval to the next. This enables close monitoring of component life cycle wear patterns to assure full component life cycle is realized.In summary, the standard S O S oil sampling interval for all engines remains at 250 hours. While 500 hour oil sample intervals remain acceptable for