SEAL AS 8T1791 - Caterpillar

Agricultural Tractor AllArticulated Truck AllAsphalt Paver AllBackhoe Loader AllCaterpillar Products Commercial Engines 3500B and 3500CChallenger AllCold Planer AllCombine AllCompact Wheel Loader AllEarthmoving Compactor AllEngineG3304B (S/N: A4E1-UP)G3306B (S/N: R6S1-UP)Engine Commercial with Electronic Unit Injection (EUI) 3500Engine Commercial with Mechanical Unit Injection (MUI) 3500Engine Generator Set 3500Engine Commercial with Electronic Unit Injection (EUI) 3500Engine Commercial with Mechanical Unit Injection (MUI) 3500Engine Generator Set 3500Engine Commercial with Electronic Unit Injection (EUI) 3500 SeriesEngine Commercial with Mechanical Unit Injection (MUI) 3500 SeriesEngine Generator Set 3500 SeriesExcavator All336E (S/N: YCE1-UP; TEG1-UP; GTJ1-UP; YEP1-UP; TMZ1-UP)349E (S/N: TFG1-UP; KCN1-UP; KFX1-UP; WHZ1-UP)Forest Products AllIntegrated Toolcarrier AllLandfill Compactor AllLoad Haul Dump AllMachine Engines AllMini Hydraulic Excavator AllMotor Grader AllOff-Highway Truck/Tractor AllPaving Compactor AllPipelayer AllRoad Reclaimer/Soil Stabilizer AllSkid Steer Loader AllSoil Compactor AllTelehandler AllTrack-Type Loader AllTrack-Type Skidder AllTrack-Type Tractor AllTruck Engines AllUnderground Articulated Truck AllWheel Dozer AllWheel Loader AllWheel Skidder AllWheel Tractor-Scraper AllIntroduction
Often when problems with the charging system are being investigated, the alternator is not the problem. If a low battery condition is present, test the batteries first. Refer to Special Instruction, SEHS7633, "Battery Test Procedure" for more information. If the engine cranks slowly, then test the starting system. Refer to Service Magazine, SEPD0020, "Testing The Starter On The Engine" for more information. If a warning indicator for the charging system is ON, refer to Service Magazine, SEBD1751, "Difference Between Alternator Indicator In Electronic Monitoring System (EMS) And Low Voltage Indicator In Operating Monitoring System (OMS)". When a problem with the charging system is suspected, then complete the testing that is outlined in this Special Instruction.Refer to "Initial Troubleshooting Procedure"tobegin troubleshooting. The procedures in this Special Instruction are designed to guide you to the problem with as little testing as possible. Usually, you will only use a few of the tests to diagnose a problem. The tests are labeled as T1 - T8 for easy reference. A descriptive title for each test is included as well.Important Safety Information
Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs.A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools to perform these functions properly.Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard.Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive. If a tool, a procedure, a work method, or operating technique that is not recommended by Caterpillar is used, ensure that it is safe for you and for other people to use.Ensure that the product will not be damaged or the product will be made unsafe by the operation, lubrication, maintenance, or the repair procedures that are used.Initial Troubleshooting Procedure
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