HQS26SD63N65T Rexroth HQS 140H 70H Hydraulic Cylinder

Product Overview

The HQS26SD63N65T Heavy Duty High Pressure Hydraulic Cylinder is an industrial-grade hydraulic actuator engineered for heavy loads and continuous-duty hydraulic systems. Designed for 100% direct drop-in interchangeability, it fully replaces HQS, 140H, 70H, and Bosch Rexroth CDM1 series cylinders (including CDM1MP5, CDM1MP3, CDM1MT4, and CDM1MS2 mounting styles). Featuring a precision-honed steel cylinder tube and an induction-hardened, chrome-plated piston rod, this cylinder resists severe mechanical shock and harsh ambient conditions. Every unit undergoes 100% simulated working pressure testing prior to shipment, guaranteeing zero fluid leakage and long-term operational performance in automated industrial machinery.

Technical Specifications

• Model Code: HQS26SD63N65T (Cross-compatible across HQS / 140H / 70H / CDM1MP5 / CDM1MP3 / CDM1MT4 / CDM1MS2)

• Bore Diameter: 63 mm

• Piston Rod Diameter: 26 mm

• Stroke Length: 65 mm

• Nominal Operating Pressure: 14 MPa (140 bar / 70H-140H standard) to 16 MPa (160 bar / CDM1 standard)

• Peak Shock Pressure: 21 MPa to 25 MPa (210 bar to 250 bar)

• Max Velocity: 0.5 m/s (Standard configuration)

• Mounting Style: SD type (Base, clevis, or tie-rod mount conforming to ISO 6020/2 and DIN 24554)

• Fluid Compatibility: Mineral oil-based hydraulic fluids, water-glycol (depending on seal package)

• Seal Package: High-durability Polyurethane (PU) / Viton (FKM) combination seals

• Operating Temperature Range: -20°C to +120°C

• Net Weight: Approx. 11.2 kg

Key Technical Advantages

• 100% Drop-In OEM Interchangeability: Envelope dimensions, mounting centerlines, rod threads, and port configurations strictly match OEM specifications, allowing direct replacement without mechanical alterations.

• Precision-Engineered Tube & Chrome Rod: Super-finished cylinder barrel interior ($Ra < 0.2\ \mu\text{m}$) combined with an induction-hardened, hard-chrome-plated piston rod ($\ge 25\ \mu\text{m}$ layer thickness) prevents premature seal wear and mechanical scoring.

• Low-Friction Sealing Technology: Specially selected sealing systems eliminate stick-slip behavior at low speeds while maintaining complete pressure containment under intense pressure spikes.

• 100% Factory Pressure Tested: Every unit is subjected to full-stroke dynamic pressure testing and static hold tests under max operating conditions to verify structural integrity and dampening performance.

Application Areas

• Metallurgy & Steel Production: Continuous casting guides, heavy shearing machine clamp cylinders, and automated valve actuators.

• Plastics & Injection Molding: High-pressure mold core-pulling and secondary ejection actuation circuits.

• Machine Tools & Factory Automation: Hydraulic clamping fixtures, metal forming presses, and high-load automated lifters.

• Heavy Machinery & Power Units: Hydraulic power unit (HPU) positioning, mobile equipment attachments, and heavy clamping systems.

Expert Maintenance Tips

• Prevent Side Loading: Ensure precise physical alignment between the cylinder rod axis and the driven load path during installation. Excessive side loads accelerate wear on rod bearings and cause seal degradation.

• Fluid Contamination Control: Maintain hydraulic oil cleanliness to ISO 4406 18/16/13 or better. A high-efficiency pressure-line filter should be installed upstream to trap particulate contamination.

• Air Bleeding Procedure: Bleed trapped air using the port air-bleed screws during initial setup. Operate the cylinder back and forth at low pressure without load for several cycles before applying full working loads.