PISTON AS 2820644 - Caterpillar

Removal Procedure
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
At operating temperature, the hydraulic oil is hot and under pressure. Hot oils can cause burns.To prevent possible personal injury, release the pressure in the implement hydraulic circuit (boom, stick, bucket, and swing), travel circuits, and the hydraulic oil tank at the filler cap before any hydraulic lines or components are disconnected or removed.Remove the filler cap only when the engine is stopped and the filler cap is cool enough to touch.
Release the hydraulic system pressure. Refer to Disassembly and Assembly, "Hydraulic System Pressure - Release".
Illustration 1 g00536257
Remove bolts (1), the washers and cover plate (2) from the underside of the cab.
Illustration 2 g00543088
Put identification marks on ten hose assemblies (3) that are connected to the selector valve for installation purposes.
Oil will drain from ten hose assemblies (3) and the control valve when hose assemblies (3) are disconnected from the valve. Place a container under the area of the selector valve in order to contain the oil.
Disconnect nine hose assemblies (3) from the selector valve. Put plugs in the ends of the hose assemblies in order to prevent oil loss and keep contaminants out of the hydraulic system.
Disconnect harness assembly (4) .
Illustration 3 g00543089
Disconnect remaining hose assembly (3) from the hydraulic activation control valve. Put a plug in the end of hose assembly (3) in order to prevent oil loss and keep contaminants out of the hydraulic system.
Remove bolts (5), the washers and selector valve (6) .