Arm Cylinder

Bore: Φ160 mm

Rod: Φ100 mm

Stroke: 632 mm (per arm swing angle)

Operating pressure: continuous 35 MPa, max 40 MPa

Max push force: 804 kN (at 40 MPa, full-bore side)

Max pull force: 490 kN (at 40 MPa, annular side)

Breakaway pressure: ≤0.5 MPa

Piston velocity: <0.5 m/s (rapid response)

Operating frequency: high-frequency intermittent, dozens to hundreds of cycles per advance cycle

Internal leakage: ≤0.03 ml/min (at 35 MPa, over seal service life)

Temperature range: -20 ℃ to +80 ℃ (standard); -40 ℃ to +120 ℃ customizable

Suitable for: steep incline hard rock excavators, incline shaft excavators, rock drift excavators, etc.

Ultra-High-Pressure Medium-Long-Stroke Construction

The barrel is forged from high-yield-ratio quenched and tempered alloy steel, with welds UT/MT inspected and end caps FEA-optimized. The piston rod is a large-diameter thick-walled rod, precision hard-chrome plated (HV900–1100), maintaining exceptional structural integrity under 40 MPa continuous pressure and digging side loads. Fatigue life exceeds 1 million full-load cycles.

High Side-Load Resistance & Guidance

A wide bronze or composite guide ring embedded in the bore, combined with precision clearance control, effectively absorbs the radial forces generated by bucket eccentric loads and inertial forces during arm swinging, preventing rod scoring or bending and ensuring long-term smooth motion.

Multi-Stage Seals & Dust Protection

Multiple wipers and a metal scraper ring at the gland front effectively block rock dust, cuttings, and water ingress. The main seal is a hydrolysis-resistant polyurethane and filled PTFE composite, ensuring zero external leakage under high-pressure, high-frequency, and rock dust conditions.

Internal Cushioning for Noise Reduction

Progressive cushioning devices at both piston ends automatically decelerate and absorb impact energy at the end of each stroke, eliminating rigid impacts, reducing noise, and protecting the articulation points and the cylinder itself.

Compact Design & Flexible Mounting

The installation envelope and dimensions are optimized to fit the confined working arm space of steep incline excavators. Self-lubricating composite bushings in the crossheads eliminate daily greasing and provide long life under high-frequency cycling and inclined operation.

Optional Smart Monitoring

A built-in displacement sensor can be integrated to provide real-time piston position feedback, enabling precise closed-loop control of the arm swing angle via the excavator's main control system.

Special bore, rod, and stroke

Built-in displacement sensor for closed-loop arm position control

Full stainless steel body and piston rod (highly corrosive environments)

Explosion-proof / mining certifications

Special mounting flanges and port configurations