- Underground Articulated Truck:
- AD45B (S/N: CXM320-UP)
The following information is an addition to the maintenance section of the Operation and Maintenance Manual. The rear differential filler plug is in a new location. The new location for the rear differential filler plug is effective with CXM320-UP.
Sampling Interval and Location of Sampling Valve
| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
Take the oil samples as close as possible to the standard intervals. To receive the full value from the S·O·S oil analysis, you must establish a consistent trend of data. To establish a pertinent history of data, perform consistent oil samplings at set intervals.
Operate the machine for a few minutes before you obtain the oil sample. This will thoroughly mix the oil for a more accurate sample.
ReferenceRefer to Special Publication, PEHP6001, "How to Take a Good Oil Sample" for more information about obtaining an oil sample.
| Type of Fluid | Change Interval | Sampling Interval | Sampling Valve |
| Engine Oil | 250 Hours | 250 Hours | Yes (1) |
| Transmission Oil | 1000 Hours | 500 Hours | Yes (1) |
| Hydraulic Oil | 1000 Hours | 500 Hours | Yes (1) |
| Differential and Final Drive Oil | 1000 Hours | 500 Hours | No |
| Coolant | 6000 Hours | 500 Hours | No |
| ( 1 ) | Machines may be equipped with optional sampling valves |
Consult your Caterpillar dealer for complete information and for assistance in establishing a S·O·S program for your equipment.
Location of Sampling Valves
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| Illustration 1 | g01034739 |
Sampling valve for the engine oil | |
The sampling valve for the engine oil is located on the right side of the engine above the engine oil filter.
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| Illustration 2 | g01162825 |
Sampling valve for the transmission and torque converter oil | |
The sampling valve for the transmission and torque converter oil is located on the transmission oil filter base.
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| Illustration 3 | g01038596 |
Sampling valve for the hydraulic system oil (at rear of filter housing) | |
The sampling valve for the hydraulic system oil is located on the steering control valve.
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| Illustration 4 | g00946265 |
Sampling port for the final drive oil | |
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| Illustration 5 | g01006917 |
Sampling port for the front differential oil | |
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| Illustration 6 | g01288219 |
Sampling port for the rear differential oil | |
The axles are not equipped with sampling valves. Obtaining a sample of the differential and final drive oils will require a vacuum pump or an equivalent. Withdraw the oil through the filler opening on each axle and final drive.
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| Illustration 7 | g01187478 |
The cooling system is not equipped with a sampling valve. Obtaining a sample of the coolant will require a vacuum pump or an equivalent. Slowly remove the cooling system pressure cap on the top of the radiator and withdraw the coolant through the filler opening.
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 and every 500 hours for all other compartments). However, more frequent oil sampling is recommended in severe applications. If the machine is operated under a high load and/or in high temperature conditions, sample all compartments at every 250 hour interval.
Application
Studies have revealed that obtaining oil samples at every 500 hours is too long a time interval in some applications in order to predict potential failure modes. A sampling interval at every 250 hours provides more data between oil change intervals. More data increases the chance for detecting a potential failure.
Determining Optimum Oil Change Intervals
Sampling the compartments at every 250 hours provides information for oil condition and for oil performance. This information is used to determine the optimum usable life of a particular oil. Also, more points of data will allow closer monitoring of component wear rates. Close monitoring also allows you to obtain the maximum use of the oil. For detailed information about extending oil change intervals, please consult your Caterpillar dealer.
Optimizing the Component Life Cycle
An increase in the number of oil samples provides a better definition of the trends in data between oil change intervals. More oil samples will allow you to closely monitor wear patterns of components. This action will ensure that the full life of the components are achieved.
The standard interval that is used between S·O·S oil samples is 250 hours for all Caterpillar engines. While 500 hour oil sample intervals remain acceptable for non-engine compartments, these intervals are not necessarily optimum. If the machine is operated under a high load and/or high temperature condition, sample all compartments at the 250 hour interval.