CONTROL GP-ELECTROHYDRAULIC 2583403 - Caterpillar

At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. Remove the breather filter cap only when the engine is stopped and the breather filter cap is cool enough to touch. Slowly loosen the breather filter cap to release any pressure in the hydraulic tank. Be cautious of hot hydraulic oil when any lines are disconnected in the hydraulic system.
Put identification on all lines, hoses, wires and tubes for installation purposes. Cap and plug all lines, hoses and tubes to prevent foreign material from entering the system. Drain all fluids in a suitable container for storage or disposal.1. Move the ejector forward 2. Remove the bolts and disconnect two hoses (1) from the valve. 3. Disconnect hose (2) from the valve. 4. Disconnect two wire harnesses (3) and hoses (4) from the valve. 5. Disconnect hose (5) from regulator (6). 6. Remove bolts (7) and retarder control valve (8) from the engine transfer gears.Install Retarder Control Valve
1. Make sure O-ring seals (1) are in position on the retarder control valve. 2. Install retarder control valve (2) on the engine transfer gear case as shown. Install the bolts that hold it. 3. Connect hose (3) on regulator (4). 4. Make sure the O-ring seals are in position in hoses (5).6. Connect hoses (5) and wire harnesses (6) on the valve. 7. Connect hose (8) to the valve. 8. Make sure the O-ring seals are in position on hoses (9).9. Connect hoses (9) on the valve. Refer to the Operation & Maintenance Manual for all fluid capacities and the proper filling procedures.Disassemble Retarder Control Valve
Start By:a. remove retarder control valve 1. Remove the O-ring seals from the face of the retarder control valve.
Covers (1) and (2) are under spring pressure. To prevent personal injury, hold the covers as the bolts are removed.
2. Remove covers (1) and (2) from the retarder control valve. 3. Remove slug (4), spring (3), the stop, spring and the valve spool from the retarder control valve. Remove the pin from the end of the valve spool if a replacement is necessary. 4. Remove bolt (8), stop (7) and diaphragm (6) from valve spool (5). 5. Remove plug (9) and the spring and plunger from the retarder control valve. Check the condition of the O-ring seal on the plug.Assemble Retarder Control Valve
1. Make sure all the parts of the retarder control valve are clean. Put clean oil on the parts. Inspect all O-ring seals for damage and make replacements if needed.2. Be sure the O-ring seal is in place on plug (2). Install plunger (1), spring (3) and plug (2) in the retarder control valve. 3. Install diaphragm (6) on valve spool (4). Install the bolt in stop (5). Install stop (5) on the valve spool as shown. Be sure the hole in the stop is in alignment with the pin in valve spool (4). 4. Install valve spool (4) in the retarder control valve as shown. Turn the lip