Jack Cylinder

Bore: Φ125 mm

Rod: Φ100 mm

Stroke: 460 mm (to meet ground clearance and leveling needs)

Operating pressure: continuous 20 MPa, max 23 MPa

Max push force: 282 kN (at 23 MPa, full-bore side)

Max pull force: 102 kN (at 23 MPa, annular side)

Breakaway pressure: ≤0.5 MPa

Piston velocity: <0.5 m/s

Operating frequency: 1–2 deployment/retraction cycles per advance cycle

Internal leakage: ≤0.03 ml/min (at 20 MPa, over seal service life)

Static holding: ≤0.5 mm piston drift over 8 h under rated support force (with hydraulic lock)

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

Suitable for: fully hydraulic drilling jumbos, mining jumbos, etc.

Powerful Support, Vibration Elimination

The 282 kN supporting force effortlessly breaks through tyre rebound frequencies, providing a rigid ground-lock that drastically reduces carrier vibration during rock drilling, enhancing drilling accuracy and drill-string life.

Safe Holding, Anti-Sinking

Integrated hydraulic lock or counterbalance valve maintains long-term support force even if power is lost or hoses rupture, eliminating the risk of “soft leg” or tipping.

High Side-Load Resistance & Guidance

Embedded wide bronze composite guide rings absorb radial forces even when supporting on slopes or uneven ground, preventing rod scoring.

Heavy-Dust Environment Protection

Heavy-duty wipers and a metal scraper ring at the gland effectively block rock chips and water. The main seal is a hydrolysis-resistant polyurethane/filled PTFE composite, ensuring zero external leakage.

Compact Flexible Mounting

The optimized dimensions fit the jumbo’s compact chassis. Self-lubricating composite bushings eliminate daily greasing, minimizing maintenance costs.

Special bore, rod, and stroke

Built-in displacement sensor for automatic leveling

Full stainless steel body and piston rod

Explosion-proof / mining certifications

Special mounting distances and port configurations