ME12002HYDRAULICSYSTEM

InspectingtheControlValve

InspectingtheControlValveandRelief Valve

1.Clean all disassembled parts with clean mineral oil.

2.Dry all disassembled parts with compressed air.

3.Place all disassembled parts onto a clean surface for inspection.

4.Check surfaces of all parts for jagged edges, scratches, notches and other defects.

5.Check that seal groove faces of casing and block are smooth and free of dust, dents, rust etc.

6.Repair all defects.

7.Clean any seat faces within the casing by washing them with a cleaning agent.

IMPORTANT:Do not leave any cleaning agent within the casing.

8.Check that all sliding and fitting parts can be moved manually.

9.Check that all grooves and paths are free from foreign materials.

10.Check if any springs are broken, deformed, and/or worn.

11.Replace all broken and/or defective springs.

12.If a relief valve is not functioning properly, repair it by following the disassembling and assembling instructions.

13.Replace all seals and O-rings with new ones.

InspectingtheReliefValve

1.Check that all seat faces on the ends of all valve washers and seats are free from defects and show uniform and consistent contact faces.

2.Confirm manually that the main valve washer and seat can slide lightly and smoothly.

3.Check the outside face of the main valve washer and the inside face of the seat for jagged edges, scratches, notches and other defects.

4.Check if any springs are broken, deformed, and/or worn.

5.Replace all broken and/or defective springs.

6.Check if any main valve washer and seat section openings are clogged with foreign materials.

7.Replace all O-rings with new O-rings.

8.When any broken and/or defective part is found, replace the entire relief valve assembly with a completely new relief valve assembly.

AssemblingtheControlValve

AssemblingtheCheckValve

1.Assemble each valve washer and spring combination as instructed in the table below.

IMPORTANT:Only use the valve washer and spring combinations as shown in the table.

2.Secure O-rings onto plugs.

3.Using a 10 mm hexagon wrench for plugs, tighten each plug to tightening torque 94.0 ~ 108.4 lb.-ft. (127.4 ~ 147.0 Nm).

4.Using a 41 mm spanner wrench for plug, tighten the plug to tightening torque 94.0 ~ 108.4 lb.-ft. (127.4 ~ 147.0 Nm).