PRE-SCREENER AS 5M2737 - Caterpillar

Personal injury or death can result from sudden machine movement.Sudden movement of the machine or release of air pressure or oil pressure can cause injury to persons on or near the machine.To help prevent possible injury before testing and adjusting any air system or hydraulic system, perform the procedure in the Testing and Adjusting, "General Information" section.
Perform the visual checks before you troubleshoot a problem. Make sure that the transmission is in neutral and stop the engine. During the visual checks, use a magnet to separate ferrous particles (iron and steel) from nonferrous particles (aluminum, rubber, and paper).Note: Modulating reducing style and ECPC style lock up clutch valves require software with different application codes. Refer to Special Instruction, REHS4541, "Software Configuration Guide{3168, 4800, 4808, 7600, 7610, 7620}".Problem Items
Problem: The oil level is too high
Note: The transmission oil must be at operating temperature and the transmission must run in NEUTRAL to circulate oil in the lines, cooler, and planetary before an accurate oil level reading can be taken.Probable Cause
The transmission was overfilled.
The engine crankshaft rear seal is allowing engine oil into the torque converter housing.Problem: The oil level is too low
Probable Cause
There is a leakage in the oil lines. See "Check: Check for oil leakage.". Add oil before you perform any tests.Problem: There is an indication of water in the oil
Probable Cause
Failure of the torque converter oil coolerProblem: There is an indication of air in the oil
Probable Cause
There is a leakage in the oil lines. See "Check: Check for oil leakage.".Problem: Rubber particles are found
Probable Cause
Seal failure
Hose failureProblem: Shiny steel particles are found
Illustration 1 g03028758
(1) Gear pump for the torque converter Probable Cause
Mechanical failure of the torque converter section (1) of the gear pump. See "Check: Check the torque converter oil filter."
Mechanical breakdown of the oil pump drive.Problem: Aluminum particles are found
Probable Cause
Mechanical failure of the torque converter. See "Check: Check the suction screen."Problem: Black fiber is found
Probable Cause
There is a worn lockup clutch in the torque converter. See "Check: Check the suction screen."Check: Check the oil level in the transmission case.
Illustration 2 g03028759
(2) Oil level sight gauge for the transmission Check the oil level in the transmission case. Look for air or water in sight gauge (2). Many problems in the torque converter are caused by low oil level or air in the oil. The transmission oil must be at operating temperature and the transmission must run in NEUTRAL to circulate oil in the lines, cooler, and planetary before an accurate oil level reading can be taken. See the Operation and Maintenance Manual, SEBU8133 for the correct type of oil.Check: Check for oil leakage.
Inspect all oil lines, all hoses, and all connections for damage or for leaks. Look for evidence of an oil leak under the machine.
Illustration 3 g00687600Note: If oil can leak out of a fitting or out of a connection, air can enter the system. Air in the system can be as harmful as having too little oil.Check: Check the torque converter oil filter.
Illustration 4 g03028736
(3) Transmission oil filter
(4) Bypass