ADAPTER 4N8725 - Caterpillar

Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the power train.
Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Probable Causes Of Problems In The Torque Converter
The toque converter is a device that changes the ratio of torque to speed between the input and output shafts of the machine. The torque converter is a type of hydrodynamic fluid coupling that transfers rotating power from the engine to a rotating driven load.Troubleshooting Problem List
Torque converter pressure is high.
Torque converter pressure is low.
The torque converter overheats.
The torque converter does not respond correctly for the left service brake pedal.
The lockup clutch does not engage.
The lockup clutch engages intermittently.
The impeller clutch does not engage.Troubleshooting
Note: Refer to the Hydraulic Schematic to identify components that are referenced in the sections that follow.Use the built-in electrical diagnostics that are performed with the electronic control module (ECM) to determine the service codes for the Machine ECM.Note: This machine is equipped with a Machine ECM. The Machine ECM has built-in diagnostics that detect faults in the electronic system.Torque Converter Pressure Is High
Probable causes:
There is a restriction inside the torque converter.
There is a restriction in an oil passage or in the oil cooler.
The torque converter inlet ratio