The Boom rear tilt prevention cylinder (also known as a backstop cylinder) is a mandatory safety component for large crawler cranes. Tasked with providing an immediate hydraulic buffer if the boom approaches its rear mechanical limit, the EPYY11112019 ensures that unintended rollback—caused by sudden load release or wind gusts—is effectively neutralized.

Whether you are performing a crawler crane rear tilt prevention cylinder replacement or upgrading a new build, this heavy duty 820kg backstop cylinder for crawler cranes offers unyielding structural integrity. Its massive $\Phi$190mm bore is designed to absorb colossal kinetic energy, serving as the final line of defense for the crane’s lattice structure.

The EPYY11112019 operates as a double-acting hydraulic buffer. It is strategically mounted behind the boom to provide resistance when the boom reaches its safe angular limit. By utilizing a 31.5MPa hydraulic circuit, it acts as a stiff mechanical stop that can decelerate the boom structure safely.

Hydraulic Performance: When the boom pivots backward, it compresses the cylinder. The $\Phi$190mm bore diameter is engineered to provide massive damping force. The cylinder’s internal manifold is designed to manage 40MPa peak pressure spikes, ensuring the safety of the entire crane superstructure.

Blueprint Anatomy: As detailed in the CAD schematic, the cylinder features a colossal 4300mm installation distance. It is equipped with oversized clevis pin geometry to handle high-shear forces. A distinctive feature is the integrated heavy-duty spherical plain bearings which absorb structural misalignments during dynamic crane operation.

40MPa Peak Protection

Engineered to withstand up to 40MPa, ensuring the heavy-duty crane safety cylinder can absorb extreme impact energy without catastrophic failure.

820kg Stabilizing Mass

The massive 820kg solid steel construction provides the necessary material density to safely stop booms weighing hundreds of tons.

Zero-Drift High-Pressure Seals

Fitted with imported Japanese NOK multi-lip seals capable of holding 31.5MPa indefinitely, ensuring zero downward creep under static load.

4300mm OEM Direct Fit

Precisely engineered to a 4300mm installation profile, it serves as a 100% mechanical drop-in for global crane fleets.

Protecting a multi-million dollar crane requires world-class metallurgy. As a leading heavy-duty crane safety hydraulic cylinder manufacturer, we forge the EPYY11112019 from ST52.3 precision seamless tubing, specifically heat-treated to resist fatigue under shock loading.

The Φ190mm internal bore is roller-burnished to a mirror Ra 0.2µm finish. This process minimizes dynamic friction during the 1400mm strokes, dramatically extending seal life even in high-heat or abrasive construction environments.

• Quenched Φ160mm Rod: Forged from high-tensile carbon steel, induction-hardened, and coated in 50µm of hard chrome for absolute impact resistance.
• Robotic Joint Welding: Port blocks and trunnions are fused via multi-pass robotic SAW welding, validated by ultrasonic NDT for zero porosity.
• 100% Pressure Hold Test: Every 820kg unit must pass a rigorous 40MPa hydrostatic hold test before dispatch to ensure absolute harvest reliability.

The EPYY11112019 providing zero-drift safety for the world’s most complex heavy-lift cranes.