Removal and Installation of Muffler

12)Base plate attachment

Attach O-ring (1-23) and the 4 O-rings (1-22) to the top surface of the flange (11).

Attach the knock pins (1-19) to the base plate (1-2-1).

Place the valve plate (1-21) mounting surface of the base plate downwards and tighten it to the flange with the hexagon socket head bolts (1-11).

Cautions: a.Apply grease to the O-ring (1-23). b.Do not apply grease to the O-rings (1-22). c.Attach the knock pins with their tapered sections up. d.Attach the base plate after applying hydraulic oil to the valve plate surface and cylinder block (1-4-1) surface. e.Be careful that the valve plate does not fall because the valve plate mounting surface of the base plate is pointing down when the base plate is attached. f. Check the mounting position of the O-rings on the flange and the position of the holes for the oil path on the base plate to attach the base plate. g.Check the position of the knock pins mounted to the base plate, the spring (1-18) mounting holes on the base plate and the flange-side knock pin holes, and the spring positions to attach the base plate. h.When tightening the socket head bolts, screw in all of the bolts around the circumference evenly.

13)Valve assembly attachment

Attach the spring (1-2-10) to the valve assembly (1-2-9) and attach the assembly to the base plate (1-2-1). After attaching the valve assembly, check that the O-rings (1-2-12) are mounted to the plug (1-2-11), attach the plug to the base plate and tighten it to the specified torque.

Next, check that the O-rings (1-2-12) are mounted to the plug (1-2-14), attach the spring guide (1-2-13) and washer (1-215), and then attach the plug to the base plate and tighten it to the specified torque.

Cautions: a.Attach the valve assembly to the base plate so that the base plate line port side is on the nearest to the installer and the valve assembly spring mounting side is on the right. Attaching in the opposite direction may cause problems such as switching errors. b.Attach the valve assembly after applying hydraulic oil to the outer circumference. c.After attaching the valve assembly, check that it moves smoothly. 14)Relief valve assembly attachment

Attach the relief valve assemblies (1-27) to the base plate (1-2-1) and tighten to the specified torque after checking that poppet seat (1-2-7-3) is mounted on the end of each relief valve assemblies.

Cautions: a.Replace the O-ring (1-2-7-7) with new one before attaching the relief valve assemblies. b.Check that the O-ring (1-2-7-17) and backup rings (1-2-7-18) are mounted on the each poppet seat (1-2-7-3). c.Apply grease to the O-rings and backup rings before attaching the relief valve assemblies.