VALVE GP-PUMP CONTROL 2088003 - Caterpillar

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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 levels for the various components of the power train.Check the oil level for the torque converter and the transmission. Refer to Operation and Maintenance Manual, SEBU8198, "Torque Converter and Transmission Oil Level - Check".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. An accurate oil level check can be performed when the oil is at operating temperature.
Check the level of the coolant in the engine cooling system.Note: Cooling of the transmission oil is achieved by exchanging heat with the engine coolant.
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 harnesses, the electrical connectors, and the fuse for the ECM. Refer to Electrical Schematic, KENR5884.With the engine start switch and the battery disconnect switch in the OFF position, check the 20 A fuse for the 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 Electronic Control Module. Refer to Troubleshooting, Systems Operation, Testing and Adjusting, KENR5099, "Power Train Electronic Control System".
Check the batteries. Turn the battery disconnect switch to the ON position.
Check the filters and the screens.Inspect the transmission oil filter. Refer to Operation and Maintenance Manual, SEBU8527, "Oil Filter (Torque Converter) - Replace".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.Directly following 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 or sleeve bearing failure.
Bronze particles give the indication of sleeve bearing failure.
Rubber particles give the indication of rubber seal or hose failure.
Shiny steel particles give the indication of pump failure.
Iron chips, steel chips, or plastic particles give the indication of broken components in the transmission.Note: The transmission