Aerial Work Platform Outrigger Cylinder

Aerial Work Platform Outrigger Cylinder

No boom until all four are down. The aerial platform's safety interlock will not enable the boom controls until every outrigger cylinder reports ground contact and the chassis is level. This is not a guideline — it is a safety standard requirement. The outrigger cylinder is the gatekeeper between a parked platform and a working platform.

On a mobile crane, the operator can choose to work with partial outrigger extension at reduced capacity — the load chart has columns for different outrigger configurations. On an aerial work platform, the safety standard does not permit this. EN 280 and ANSI A92 require that all outriggers are fully deployed, ground contact is confirmed (typically by a pressure switch or proximity sensor on each outrigger cylinder), and the chassis is level (within 1–3° of horizontal) before the boom control circuit is energised.

Auto-Level — The Outrigger Cylinder Levels the Chassis Automatically

Many modern aerial platforms include automatic levelling — the platform's control system reads the chassis inclinometer and individually adjusts each outrigger cylinder to bring the chassis to within ±0.5° of horizontal. The operator presses one button, and the system extends all four outriggers, senses ground contact, then fine-adjusts each leg independently until the chassis is level.

Bore (45–200 mm) honed to Ra 0.2–0.4 µm. Chrome 50–80 µm. The cylinder barrel includes a machined port boss for the pressure switch (or proximity sensor) — positioned to detect ground contact at the specified pad force. Load-holding pilot-check valve mounting provisions are machined on the barrel — the valve mounts directly on the cylinder with no intermediate hose.