LADDER GP 3904844 - Caterpillar

1. Drain the oil from the steering system hydraulic tank.2. Put identification marks on the hoses connected to the flow control valve for installation purposes.3. Disconnect hoses (2) and (3) from flow control valve (1), and reinstall the flanges and bolts to hold the sections of the valve together.4. Disconnect the remainder of the hoses from flow control valve (1). Disconnect the flow switch wire.5. Remove the three bolts that hold the flow control valve to the machine, and remove the flow control valve from the machine. The following steps are for installation of the flow control valve.6. Put flow control valve (1) in position on the frame, and install the three bolts that hold it.7. Connect all the hoses to flow control valve (1). Connect the flow switch valve.8. Fill the steering system hydraulic tank with oil to the correct level. See the Maintenance Guide.Disassemble Flow Control Valve
START BY:a. remove flow control valve 1. Remove bodies (2) and (3) from body (1). 2. Remove spring (4), valve (5) and O-ring seal (6) from body (3). 3. Remove valve (7), spring (8), O-ring seal (10) and switch (9) from body (2). 4. Remove valve group (11) from body (1). 5. Disassemble the check valve as follows:a. Remove O-ring seal (12) from body (13).b. Remove plug (17), spring (15) and valve (14) from body (13).c. Remove O-ring seal (16) from plug (17). 6. Remove orifice (19) from body (1).7. Remove relief valve (18) from body (1). Remove the O-ring seal from the body. 8. Disassemble the relief valve as follows:a. Remove O-ring seals (21) from body (20).b. Remove body (24) from body (20). Remove valve (22), spring (23) and spacer (27) from body (24). Remov O-ring seal (28).c. Remove plug (26) from body (24), and remove O-ring seal (29) from it. Remove plunger (25) from body (24). d. Remove seat (32), spring (31) and plunger (30) from body (21) with a hammer and punch. Remove the spacer from the body.Assemble Flow Control Valve
1. Assemble the relief valve as follows:a. Install the spacer in body (1). Put plunger (2), spring (3) and seat (4) in position in body (1). b. Put O-ring seal (11), spacer (8), spring (7) and valve (6) in position in body (9). Install body (9) in body (1).c. Install O-ring seals (5) on body (1).d. Install plunger (10) in body (9).e. Put O-ring seal (12) in position on plug (13), and install plug (13) in body (9).f. Check the adjustment of the relief valve. See Testing And Adjusting. 2. Align the holes in orifice (15) with the cross holes in body (16). Install the orifice in the body.3. Put seal (17) in position in the groove of body (16). Install relief valve (14) in body (16). 4. Assemble the check valve as follows:a. Put O-ring seal (22) in position on plug (21).b. Put valve (19) and spring (20) in position in body (18).c. Install plug (21) in body (18). 5. Put O-ring seal (24) in position