How to On Delay Timer Assembly Test

Procedure to Test the On Delay Timer AssemblyThe engine start switch must be in the ON position, and the air conditioning switch must be activated in order to diagnose a faulty on delay timer assembly for the refrigerant compressor.Note: The on delay timer assembly will delay the power supply to the compressor clutch coil for 30 seconds after...

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How to Prosedure Removed Manifold Gauge Set Refrigerant

Manifold Gauge Set (Refrigerant)Remove charging hoses properly. A low system charge will result from charging hoses that are not removed correctly. In order to ensure accuracy of the refrigerant charge, the refrigerant should be removed from the charging hoses. Refer to the following steps in order to remove the refrigerant from the charging hoses: 1. Allow the compressor to continue operating. Close the valve on the high pressure...

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How to Test A/C Compressor Condition.

Refrigerant Compressor - TestIdentifying compressors that function is the purpose of this instruction. Compressors that function should be identified before the compressors are removed from a machine. Compressors that function should produce both high pressure and low pressure. If the compressor fails any one of Steps 3, 5, 7, or 8, then...

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How to test A/C leaking at Caterpillar Machine Product

Refrigerant Leakage - TestCAT ProductIn the middle of 1999, Caterpillar began installing dye in the refrigeration systems of Caterpillar machines. The dye is used in order to assist in identifying points of leakage in the refrigeration system.Finding leaks and repairing leaks from refrigerant is important since the air conditioner is a closed circuit system.The system must contain at least 0.4 kg (.88 lb) of refrigerant. Install...

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How if the machine intermittent low power

Intermittent Low Power or Power CutoutNote: Use this procedure only if the engine does not shut down completely.Probable Causes * Diagnostic codes * Event codes * Turbocharger * Air inlet and exhaust restrictions * Throttle signal * Power supply for the Electronic Control Module (ECM) * Fuel supplyRecommended ActionsNote: If the problem only occurs under certain conditions, test the engine under those conditions. Examples...

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How to fix if the steering problem

Testing and Adjusting784C and 785C Off-Highway Truck/Tractors Steering SystemSteering System TroubleshootingWhen a problem with the steering system is defined, use the following procedure: 1. Perform a visual inspection. Refer to Testing and Adjusting, "Visual Inspection". 2. If the problem has not been identified, do "Operation Checks". 3. If the problem is still undetermined, do "Performance Tests".This procedure will help to...

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What is a Tractors Power Train

Systems Operation784C, 785C and 785C HAA Off-Highway Truck/Tractors Power TrainBasic diagram for the power train systemsThe power train is made up of four basic systems. The following systems are the four systems:* Power Train Electronic Control Module* Torque Converter* Transfer Gears and Transmission* Differential and Final DrivesThe four...

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ECM for control engine governor and fuel injection type D10R

Diagram fuel injection and electronic governorThe electronic system consists of the following components: Electronic Control Module (ECM), Hydraulic Electronic Unit Injectors (HEUI), Injection Actuation Pressure Control Valve (IAPCV), wiring harness, switches and sensors. The ECM receives information from the sensors and the switches on...

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Starting motor 50-MT

Starting motor 50-MTThe 50-MT series starting motor may be ordered in the following versions: 24 volt, 32 volt and 64 volt. See the chart in Specifications, "50-MT Series Starting Motor Coverage" for a list of part numbers for starting motors that are covered in this module.The starting motor is used in order to turn the engine flywheel quickly...

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How to Calibrate Engine Pressure Sensor for CAT- D10R

Engine Pressure Sensor - CalibrateSystem Operation Description:The Electronic Control Module (ECM) attempts to perform an automatic calibration of all pressure sensors whenever the ECM is powered and the engine is OFF for at least five seconds. Cranking the engine during the first five seconds causes the ECM to abort the calibration attempt. Perform a manual calibration if a pressure sensor is replaced.During an automatic pressure...

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How to Check step by step Refrigerant Circuit Problems part 9

Refrigerant Circuit ProblemsSystem Condition 14 1. Low pressure gauge reading is below normal. For normal operating pressures, refer to Table 1. 2. High pressure gauge reading is below normal. For normal operating pressures, refer to Table 1. Note: Ambient temperature is above 21°C (70°F). 3. The air flow to the operator's compartment is very cold, or the air flow may be restricted completely at times.Probable CauseThe...

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How to check step by step Refrigerant Circuit Problems part 8

Refrigerant Circuit ProblemsSystem Condition 12 * Water is in the vents. * Water is leaking from the unit.Probable Cause * The non-return valve of the drain 1. Check the non-return valve for proper positioning and proper direction.The Compressor will not EngageIf the machine is equipped with the protection system for the refrigerant compressor, Refer to the Service Manual, SENR 5664, "Troubleshooting Heating and Air...

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How to Check step by step Refrigerant Circuit Problems part 7

Refrigerant Circuit ProblemsSystem Condition 11 1. Low pressure gauge reading is too high. 2. High pressure gauge reading is too high. Note: Ambient temperature is above 21°C (70°F). 3. The temperature of the air flow from the evaporator is warm.Probable CauseThe condenser is not functioning properly.Note: The system may have a normal or overcharge of refrigerant. 1. Check for a blockage in the flow of air through...

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How to Check step by step Refrigerant Circuit Problems part 6

Refrigerant Circuit ProblemsSystem Condition 10 1. Low pressure gauge reading is too low. 2. High pressure gauge reading is too low. Note: Ambient temperature is above 21°C (70°F). 3. The temperature of the air flow from the evaporator is partially cool or warm. 4. Moisture (water) or frost is on the expansion valve inlet or orifice tube...

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How to Check step by step Refrigerant Circuit Problems part 5

Refrigerant Circuit ProblemsSystem Condition 9 1. Low pressure gauge reading is above normal. For normal operating pressures, refer to Table 1. 2. High pressure gauge reading is normal or low. For normal operating pressures, refer to Table 1. Note: Ambient temperature is above 21°C (70°F) and the system has a refrigerant charge that...

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How to Check step by step Refrigerant Circuit Problems part 4

Refrigerant Circuit ProblemsSystem Condition 8 1. Low pressure gauge reading is above normal. 2. High pressure gauge reading is below normal. Note: Ambient temperature is above 21°C (70°F) and the system has a refrigerant charge that is full. 3. The temperature of the air flow from the evaporator is partially cool.Probable CauseThe compressor has internal leaks. The reed valve has leakage. The compressor piston, rings...

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How to Check step by step Refrigerant Circuit Problems part 3

Refrigerant Circuit ProblemsSystem Condition 6 1. The low pressure gauge reading does not change. The pressure should rise when the compressor is not in operation. For normal operating pressures, refer to Table 1. 2. High pressure gauge reading is at the high end of the normal range. Note: Ambient temperature is above 21°C (70°F). 3. The temperature of the air flow from the evaporator is partially cool.Probable CauseThe...

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How to check step by step Refrigerant Circuit Problems part 2

Refrigerant Circuit ProblemsSystem Condition 4 1. Low pressure gauge reading is below normal. For normal operating pressures, refer to Table 1. 2. High pressure gauge reading is normal to the below normal range. For normal operating pressures, refer to Table 1. Note: Ambient temperature is above 21°C (70°F). 3. The temperature of the air flow from the evaporator is partially cool. 4. The high side liquid line or the...

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How to Check step by step Refrigerant Circuit Problems part 1

Refrigerant Circuit ProblemsThere is no or only little cool temperature to the air flow from the evaporator.System Condition 1 1. Low pressure gauge reading is below normal. For normal operating pressures, refer to Table 1. 2. High pressure gauge reading is below normal. For normal operating pressures, refer to Table 1. Note: Ambient...

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Due Air Conditioning System Troubleshooting

Heating and Air Conditioning System Troubleshooting Refrigerant Quick-Check Procedure for R-134a Expansion Valve And Orifice Tube SystemsNote: This procedure does not call for the installation of the manifold gauge set. The procedure should be used only as an indication of the actual system condition. For the detailed troubleshooting procedures, refer to the "Problem Solving Procedure" section.Note: In order to use this procedure,...

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