Eight position shifting cylinder-P55557-3

Core Technical Parameters
Parameter Value Remarks
Model P55557-3 (Common Matches: R431003808, IA479) 8-position shift cylinder for heavy-duty transmissions
Brand Rexroth (now Aventics) Original equipment for Rexroth EasyHandling system
Type Multi-stage stop ring + piston type, 8-position indexing Step-by-step telescoping for transmission stepped valve control
Working Medium Clean compressed air Particles ≤5 μm, oil content 0-1 mg/m³, pressure dew point ≤3°C and 15°C below ambient
Maximum Working Pressure 6 bar (theoretical torque condition) Compatible with standard pneumatic control system pressure
Materials Housing/cover/base plate: Anodized aluminum (partially blackened); Shaft/rotary flange: Quenched steel; Seals: Acrylic rubber Suitable for harsh industrial environments
Interface Standard pneumatic threaded ports Compatible with corresponding shift valves (e.g., P55556-3)
Application Workover rigs, heavy-duty vehicle hydraulic transmissions Drives transmission clutch oil circuit on-off to achieve gear shifting
Key Features
Precise 8-position indexing via logical control of piston and stop ring movement through air inlets, enabling step-by-step telescoping of the push rod.
Components undergo anodization, quenching and other treatments for wear resistance and corrosion resistance, suitable for outdoor/heavy-duty conditions.
Interlocks with 8-position shift valves to control hydraulic transmission clutch oil circuits, ensuring smooth and reliable gear shifting.