KIT-SEAL 1774256 - Caterpillar

At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. Remove the fill plug only when the engine is stopped, and the fill plug is cool enough to touch with your bare hand.
1. Release the pressure in the hydraulic system by slowly loosening the pressure cap located on the side of the hydraulic oil tank.2. Remove the access cover from under the cab.
View From Under Cab3. Put identification marks on four hoses (1) and electric wires (2) that are connected to the shuttle valve. Disconnect the hoses and the electric wires from the valve.4. Remove the two bolts and washers that hold the valve to the floor of the cab. Remove shuttle valve (3). Install the shuttle valve in the reverse order of removal.9. Check the oil level in the hydraulic oil tank. Fill the hydraulic oil tank to the correct level. See the Operation & Maintenance Manual for the correct filling procedure.Disassemble & Assemble Shuttle Valve
Start By:a. remove shuttle valve1. Be sure the shuttle valve is thoroughly clean prior to disassembly.2. Remove the pressure switch from the shuttle valve. Put identification marks on the hydraulic fittings and elbow in the shuttle valve as to their location. Remove the fittings from the fittings and elbow. 3. Remove plug (1), seat (3) and steel ball (4) from the valve body. Remove o-ring seal (2) from the plug.4. Remove plug (9) and steel ball (7) from the valve body. Remove o-ring seal (8) from the plug Assemble the shuttle valve in the reverse order of disassembly. Prior to assembling the shuttle valve, be sure all the parts of the valve are clean and free of dirt and debris. Put clean hydraulic oil on the internal parts of the valve. Also, check the condition of the o-ring seals. If the seals are worn or damaged, use new parts for replacement.End By:a. install shuttle valve