AIR CONDITIONER GP 8V1159 - Caterpillar

The Transmission Hesitates During Shifting
Possible Cause
The wiring harness for the transmission may be damaged.
Check the wiring and check the connectors for damage. Refer to Specifications, Systems Operation/Testing and Adjusting, "Visual Inspection".
Repair any damage that is found in the wiring harness or replace any loose connections that are found.
One or more modulating valves for the electronic clutch pressure control may not be functioning correctly.
Test the modulating valves for the electronic clutch pressure control. Refer to Specifications, Systems Operation/Testing and Adjusting, "Modulating Valves (Electronic Clutch Pressure Control) - Test".
The pressure of the oil in the transmission hydraulic control system may not be within the specification.
Test the pressures of the oil in the transmission hydraulic control system. Make any necessary repairs or adjustments. Refer to Specifications, Systems Operation/Testing and Adjusting, "Relief Valve (Transmission Hydraulic Control) - Test and Adjust".
There is debris and damaged components in the transmission.
Inspect the oil filter for debris. Refer to Specifications, Systems Operation/Testing and Adjusting, "Visual Inspection".
Determine the origin of the debris and repair the damaged components.
Change the oil in the transmission and install a new oil filter.
The transmission oil level is outside the specification.
Check the transmission oil level. Refer to Specifications, Systems Operation/Testing and Adjusting, "Visual Inspection".
The seals on the piston in the transmission clutch may be leaking.
Check the pressure of the oil in the clutch under full engagement. Refer to Specifications, Systems Operation/Testing and Adjusting, "Modulating Valve (Electronic Clutch Pressure Control) - Test".
There may be damaged components in the clutches for the transmission.
Inspect the oil for debris. Refer to Specifications, Systems Operation/Testing and Adjusting, "Visual Inspection".
Inspect the clutches for damage. Refer to Disassembly and Assembly, KENR6061, "Power Train". Refer to Reuse and Salvage Guidlines, SEBF8098, Reuse and Salvage Guidlines, SEBF8031.
Check that the disks and the plates are within the specified dimensions. Refer to Disassembly and Assembly, KENR6061, "Power Train".
Check the springs in the clutches. Refer to Specifications, Systems Operation/Testing and Adjusting, KENR5267, "Power Train Specifications" for the correct specifications for the springs in the transmission clutches.Troubleshooting The Transmission Calibration
Ensure that the following conditions are met when calibration of the transmission is attempted.
The transmission is in neutral.
The engine is running at low idle.
The transmission oil needs to be at a temperature between 70 °C (158 °F) and 75 °C (167 °F).Clutch at Limit
Possible Cause
The transmission oil level is lower than the specification.
Check the transmission oil level. Refer to Specifications, Systems Operation/Testing and Adjusting, "Visual Inspection".
Add oil to the transmission if the oil level is lower than the specification. Refer to Operation and Maintenance Manual, SEBU8206, "Torque Converter and Transmission Oil Level - Check".
The transmission oil pressure may be outside the specification.
Check the pressure of the oil from the transmission pump. Refer to Specifications, Systems Operation/Testing and Adjusting, "Hydraulic Oil Contamination - Test".
Adjust the pressure of the system if it is necessary. Refer to Specifications, Systems Operation/Testing and Adjusting, "Relief Valve (Transmission Hydraulic Control) - Test and Adjust".
The software in the ECM is not the latest version.
Flash the latest software release. Refer to Systems Operation/Troubleshooting/Testing and Adjusting,