SCREW-LOCK 1G3176 - Caterpillar

Do not disconnect any oil lines until all oil pressure in the main system has been released.
1. Drain the oil from the hydraulic tank. 2. Disconnect twelve oil hoses from the logic valve (1). There are five hoses on each side of the valve and one hose on the top and bottom. 3. Remove three bolts and nuts (2), then remove the logic valve (1) from the frame.4. Put logic valve (1) in position on the frame with the bolts and nuts (2) that hold it. 5. Connect twelve oil hoses (five on each side, one on top and bottom) to the logic valve.6. Fill the hydraulic tank with oil to the correct level.Disassemble Logic Valve
start by:a) remove logic valve 1. Remove plug (1) from the logic valve. 2. Remove the O-ring seal (2) from the plug. Make a replacement of the seal if necessary. Remove spring (4) and valve spool (3) from the logic valve.Assemble Logic Valve
1. Install valve spool (1) and spring (2) in the logic valve.2. Put a new O-ring seal (3) on plug (4). Install plug (4) in the logic valve.