PISTON GROUP 8N3183 - 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.
Before troubleshooting a problem, perform the visual checks. Perform the checks with the engine OFF and with the parking brakes ON. Put the transmission control in NEUTRAL and the transmission rotary selector spool in NEUTRAL. During the checks, use a magnet to separate ferrous particles from nonferrous particles.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 be run in NEUTRAL to circulate oil in the lines, cooler, and planetary before an accurate oil level reading can be taken.Probable Cause
Oil is leaking from the pump drive into the transmission gear pump.Problem: The oil level is too low.
Note: The transmission oil must be at operating temperature and the transmission must be run in NEUTRAL to circulate oil in the lines, cooler, and planetary before an accurate oil level reading can be taken.Probable Cause
Perform "Check: Check for oil leakage.". Add oil before any tests are performed.Problem: There is an indication of water in the oil.
Probable Cause
Failure of the transmission oil cooler Problem: There is an indication of air in the oil.
Probable Cause
Perform "Check: Check for oil leakage.".Problem: Rubber particles are found.
Probable Cause
Seal failure
Hose failureProblem: Black coarse material is found.
Probable Cause
Worn clutches in the transmission
Failure of a thrust discProblem: Black fiber is found.
Probable Cause
There is a worn lockup clutch in the torque converter. See "Check: Check the suction screens.". Problem: Thin strands that are elastic are found.
Probable Cause
Worn clutches in the transmissionProblem: Iron chips or steel chips are found.
Probable Cause
Broken components in the transfer gears or in the transmissionProblem: Shiny steel particles are found
Illustration 1 g03028758
(1) Transmission section of the gear pump. Probable Cause
Mechanical failure of the transmission section (1) of the gear pump. See "Check: Check the transmission oil filter.".Problem: Aluminum particles are found.
Probable Cause
Worn housings, load pistons, or selector pistons in the pressure control valve
Mechanical failure of the pump drive. See "Check: Check the suction screens."Check: Check the oil level in the transmission section of