Boom Lift Steering Hydraulic Cylinder — HCYY11112007 | Dual 100mm Stroke Φ40×Φ25, 10 MPa

HCYY11112007 — Boom Lift Steering Hydraulic Cylinder (Dual 100 mm Stroke Configuration)

The HCYY11112007 boom lift steering hydraulic cylinder represents a specialized steering actuator configuration: a dual-stroke (100 × 2) design that delivers 100 mm of travel in each direction from the cylinder’s centerline neutral position. This geometry is used in boom lift steering systems where the cylinder must steer equally left and right, with the axle or wheel linkage attached to the rod in the midstroke position rather than at one end.

At 10 MPa working pressure — notably lower than the 20 MPa of the HCYY11112004 — this cylinder is dimensioned for electric boom lift steering circuits where the hydraulic pump operates at a lower system pressure to minimize motor current draw and extend battery range. The Φ40 × Φ25 bore-and-rod combination and 645 mm installation distance make it a compact yet capable actuator for the steering axles of medium-format self-propelled platforms.

Technical Specifications: Dual-Stroke Boom Lift Steering Cylinder at 10 MPa

Installation position reference — Steering Cylinder location in boom lift hydraulic layout

Understanding the Dual-Stroke Steering Cylinder Design: How 100×2 Configuration Works

A standard single-rod steering cylinder extends from a fully retracted position to a fully extended position, with the wheel linkage attached somewhere along this travel. A dual-stroke (sometimes called “double-rod-end” or “center-null”) cylinder is different: it has rod extensions on both ends of the barrel, and the wheel linkage is connected to the rod in the cylinder’s mid-travel position.

In the HCYY11112007, the cylinder at neutral (straight-ahead position) is at 50% stroke on both sides. Steering left extends the piston rod 100 mm to the left while retracting the right side rod 100 mm, and vice versa for right steering. This configuration produces perfectly symmetrical left-right steering geometry and equal force in both directions — both sides of the piston see the same bore area because there is a rod on each side.

For aerial work platform applications, this symmetry is important for operator feel and predictable platform tracking during repositioning. A platform with asymmetric steering force (as can happen with a single-rod cylinder that has significantly different bore areas on extend vs retract sides) may feel different to steer left versus right, particularly on gradients.

10 MPa System Design: Steering Cylinder for Electric Boom Lift Hydraulic Circuits

The HCYY11112007 is rated for 10 MPa working pressure — half the pressure of the HCYY11112004 steering cylinder. This lower pressure rating is not a compromise; it is optimized for electric-drive aerial work platforms where the hydraulic system operates at 10 MPa to reduce the power demand on the onboard battery pack.

At 10 MPa, the Ø40 mm bore produces approximately 12.6 kN of steering force per side — sufficient for the lighter steering loads of electric indoor-rated boom lifts that operate on smooth, level industrial floors rather than the rough terrain demands of diesel machines.

The lower system pressure also contributes to extended seal life. Seal degradation rate in hydraulic cylinders increases with operating pressure, so a 10 MPa seal package will outlast a 20 MPa-rated one in terms of cycle count before replacement — a significant maintenance advantage for rental fleets with high-utilization machines.

Applications: Dual-Stroke Steering Cylinder for Indoor and Electric Boom Lifts

• Electric self-propelled boom lifts — rear-axle steering for battery-powered articulating and telescopic platforms operating at 10 MPa hydraulic system pressure.
• Indoor aerial work platforms — facilities maintenance and warehouse platforms where low noise, zero emission, and tight maneuverability are required.
• Four-wheel steering platforms — where front and rear steering cylinders are paired for crab-steering or coordinated four-wheel-steer capability in tight aisles.
• OEM replacement sourcing — maintenance teams replacing worn steering cylinders on electric boom lifts where the original cylinder specification calls for a dual-stroke, low-pressure design.

Installation and Bleeding Procedure for Dual-Stroke Steering Cylinders

The 645 mm installation distance of the HCYY11112007 is measured with the cylinder at its neutral mid-stroke position (both rods at 50% of their 100 mm travel). When installing, center the cylinder before connecting the wheel linkage to ensure equal steering lock in both directions.

After installation, bleed the steering circuit by cycling lock-to-lock at low speed with the platform stationary and boom retracted. Check for equal lock-to-lock movement in both directions; unequal lock indicates either an air pocket or a misaligned linkage connection. Verify port connections on both ends — this cylinder has hydraulic ports on both sides of the barrel, and reversing the hose connections will invert the steering direction.