PIN-LOWER 7V6722 - Caterpillar

Do not check for leaks with your hands. Pin hole (very small) leaks can result in a high velocity oil stream that will be invisible close to the hose. This oil can penetrate the skin and cause personal injury. Use cardboard or paper to locate pin hole leaks.
Check the oil level.Note: Many problems in the power train are caused by low oil levels or by air in the oil. If the engine has not been started for several minutes, this oil level check will ensure that oil is in the transmission and that the engine can be started. If the machine has not been moved overnight or an extended period of time and the engine has not been started, the oil level will be high. An accurate oil level check can be performed after the oil is hot.
Check for leaks.Inspect all oil lines, hoses, and connections for damage or for leaks. Look for oil on the ground under the machine.Note: If oil can leak out of a fitting or a connection, air can leak into the system. Air in the system can be as bad as a low amount of oil.
Check the electrical system.Inspect the fuse for the Power Train Electronic Control Module, the harnesses, and the electrical connectors. Refer to the proper Electrical Schematic.With the engine start switch and the battery disconnect switch in the OFF position, check the 10 ampere fuse for the Power Train Electronic Control Module. If the fuse is open, replace the fuse.Inspect the electrical harnesses for damaged wires or for broken wires. Disconnect each connector and look for pins and sockets that have been bent, broken, or removed. Look for any foreign material inside the connectors. The connectors must be tightened with normal force. The connectors must be disconnected with the same amount of force.Check the Power Train Electronic Control Module. For procedures, refer to Power Train Electronic Control System, SENR8688.
Check the batteries.Check the batteries. Turn the battery disconnect switch ON.
Check the filters and the screens.Inspect the transmission oil filter, the transmission magnetic screen, and the suction screen.Remove some of the oil from the housing of the transmission oil filter. Remove the filter. Cut apart the filter and inspect the filter element for foreign materials. Also, inspect the transmission scavenge screen and the transmission magnetic screen. A magnet separates the ferrous particles from the nonferrous particles.This is a list of some of the particles that may be found in the filter element:
Aluminum particles give the indication of torque converter failure.
Bronze particles give the indication of worn clutches in transmission.
Rubber particles give the indication of rubber seal or hose failure.
Shiny steel particles give the indication of pump failure.
Iron or steel chips give the indication of broken components in transmission or transfer gears.Note: The transmission oil filter has a bypass valve. A bypass valve allows oil to bypass the oil filter elements whenever the difference in pressure between the inlet oil and the outlet oil in the oil filter is too high. Any oil