A construction equipment support leg cylinder extends vertically to bring the support foot into contact with the ground, raise or level the chassis and create a stable working base. It is used on mobile construction machinery such as cranes and material handlers where the operating load must be transferred through the support structure rather than the tyres or travel undercarriage alone.
We review the cylinder together with your chassis, support-leg structure and hydraulic circuit. Send us the machine model, maximum reaction at each leg, installation angle, deployed and retracted reference lengths, mounting details and hydraulic schematic. This lets us identify the dimensions and interfaces that control travel, alignment and load holding.
Bore and stroke alone do not confirm a support-leg cylinder. The cylinder must reach the ground within the available chassis envelope, support the specified vertical reaction without unintended side load and retract fully for transport. Provide the complete mechanism and circuit information before ordering.
| Item | What you should provide | What it establishes |
|---|---|---|
| Machine and support-leg layout | Machine type and model, number of legs, cylinder location, deployment direction and installed orientation | Confirms vertical construction-equipment support rather than an AWP stabilizer or horizontal outrigger beam. |
| Support reaction and load cases | Maximum load at each leg, machine mass distribution, working slope, lifting sequence and any dynamic or impact condition | Defines the load path used to review bore, rod, mounts and the required holding arrangement. |
| Travel and reference lengths | Stroke, retracted and deployed pin-centre lengths, ground clearance, leveling range and interference points | Confirms whether the foot reaches the support surface and retracts within the transport envelope. |
| Mounting and foot interface | Base mount, trunnion, clevis or flange details; pin sizes, widths, offsets, rod-end connection and foot-pad geometry | Allows both cylinder ends to be checked against the chassis and ground-contact structure. |
| Hydraulic and holding circuit | Working and peak pressure, port thread and position, flow, fluid, valve-block interface and hydraulic schematic | Confirms connection compatibility and the machine-specified method of holding the supported load. |
| Duty and environment | Cycle pattern, storage orientation, temperature, dust, mud, water, salt exposure and cleaning method | Guides discussion of seals, wipers, rod finish and external protection for your operating conditions. |
Share the chassis and support-leg drawings, maximum reaction loads, leveling range, installation envelope and hydraulic schematic. We can review the cylinder envelope, stroke, reference lengths, mounting interfaces, ports and foot connection as one configuration.
If the approved drawing is unavailable, send the existing part number, clear installed photos and complete measurements from the removed cylinder. We will identify missing reference lengths, mounting dimensions, port details or circuit information before quotation.
Inspect the pins, bushings, brackets, foot pad, supporting chassis and hoses before replacing the cylinder. Bent structure, worn joints or uneven ground contact can change the load path and introduce side load even when the replacement cylinder dimensions are correct.
It extends a support foot vertically or at the machine-specified angle, transfers chassis load to the ground and helps level and stabilize the machine before lifting or handling work begins.
No. This cylinder deploys the support foot and supports the vertical reaction. A horizontal outrigger cylinder extends or retracts the outrigger beam to change the support footprint.
No. This page covers cranes and other mobile construction machinery, where buyers specify the cylinder around the construction chassis, vertical reaction, foot interface and site duty. The aerial platform outrigger cylinder page is reserved for scissor lifts and mobile elevating work platforms with a different support structure and operating context.
Send the machine model, existing part number, stroke, closed and open lengths, all mount and pin dimensions, foot connection, ports, valve block, installed orientation and clear photos.
A long exposed rod or misaligned support structure can introduce bending and side load. Your drawing should show the deployed geometry, guides, pin centres and foot contact so the cylinder can be reviewed in the actual load path.
See our construction machinery hydraulic cylinders and construction equipment application pages.