Aerial Work Platform Hydraulic Cylinders RFQ Checklist: What OEM Buyers Should Specify

An aerial work platform hydraulic cylinder RFQ must connect the cylinder specification to the machine’s lifting, extending, swinging, leveling or outrigger function. The safety and stability of the platform depend on correct geometry, pressure, load-holding behavior and interface control. الهيدروليكية تشنغتشيانغ reviews the complete application data before confirming an OEM or replacement design.

The published aerial-work-platform cylinder portfolio covers scissor lifts, boom lifts and other aerial equipment. Its listed range is 40–230 mm bore, 22–160 mm rod diameter, 85–19,020 mm stroke, working pressure up to 32 MPa, push force up to 1,038 kN, pull force up to 536 kN and operating temperature from −40 to 100 °C. The stated matching range is 9–100 meter aerial working machinery. These are portfolio limits, not automatic design values for a specific platform.

1. Identify the platform and the cylinder’s motion

Provide the equipment manufacturer, model, platform height or reach class, machine revision and the exact cylinder function. Scissor-lift cylinders, telescopic-boom cylinders, luffing cylinders, steering cylinders, outrigger cylinders and leveling cylinders do not share the same load cases. Indicate whether the cylinder supports a suspended load, controls platform level or locks the machine during work.

• Platform type: scissor lift, articulated boom, telescopic boom or vehicle-mounted platform.
• Cylinder position and motion controlled.
• Rated platform height or reach, working load and machine configuration.
• OEM part number, drawing number and revision.
• New OEM program, replacement, repair reference or redesign scope.

2. Supply complete geometry and installation interfaces

The drawing must define retracted length, extended length, stroke and every mounting interface from consistent datums. Include pin-center distances, clevis or eye dimensions, bearing details, port positions, hose clearances and the envelope through the full platform motion. For telescopic or long-stroke arrangements, identify every stage and support condition.

• Bore, rod diameter, stroke, closed length and open length.
• End-mount type, pin diameters, widths, tolerances and grease paths.
• Barrel, gland and rod envelope around adjacent structures.
• Port type, size, orientation and hose routing.
• Sensor, limit switch, counterbalance valve or holding-valve interface.
• Cushioning, mechanical stops and installation orientation.

3. Define loads at the critical platform positions

State the required push and pull forces and show how they were derived. The most demanding condition may occur at low boom angles, during initial scissor lift, at maximum outreach, during leveling or under an eccentric platform load. Supply the linkage geometry, center-of-gravity assumptions and any wind, acceleration or emergency-lowering load case required by the machine design.

Do not select the cylinder only from machine working height or nominal platform capacity. Cylinder force changes with mechanism leverage, and long rods must also be checked for compression stability, bending and alignment.

4. Describe the hydraulic circuit and load-holding requirement

Provide normal pressure, relief pressure, possible transient peaks, pump flow, target motion time, hydraulic fluid and circuit diagram when available. Explain whether a load-holding valve, counterbalance valve, pilot-operated check valve, flow divider or synchronization arrangement is part of the cylinder assembly or the machine circuit.

• Normal operating and maximum permitted pressure.
• Extension and retraction speed or cycle-time target.
• Fluid type, viscosity range and filtration expectation.
• Permissible platform drift and pressure-decay criteria.
• Emergency lowering and manual recovery requirements.
• Coordination with paired or multiple cylinders.

5. Record duty cycle and service environment

Aerial equipment may combine short lifting cycles with long periods held at elevation. Record daily cycles, time under load, holding duration, travel vibration, outdoor storage and maintenance frequency. Include low-temperature startup, high ambient temperature, rain, dust, salt exposure or washdown conditions. Confirming the project-specific seal and fluid combination remains necessary even when the temperature falls within the portfolio range.

6. Address stability, alignment and long-stroke risk

Long strokes and changing boom geometry increase sensitivity to rod buckling, side load, deflection and mount misalignment. The RFQ should provide the maximum unsupported rod length, end conditions, guidance arrangement and expected structural deflection. A larger rod may improve column stability, but it also changes pull force and retraction speed; it cannot compensate for incorrect machine alignment.

7. Define verification and acceptance evidence

State the required drawing-review process, inspection plan, pressure test, leakage limits, functional cycling and documentation. If the cylinder is part of a regulated machine approval process, identify the applicable project requirements and the party responsible for final equipment validation. Do not assume a component test alone validates the complete aerial platform.

• Approved drawing and controlled change process.
• Critical dimensional inspection report.
• Pressure, leakage and functional-cycle test criteria.
• Load-holding or drift test conditions when required.
• Material, surface treatment and traceability documents.
• Identification, packaging and corrosion-protection instructions.

8. Include sourcing and production details

An RFQ should separate prototype quantity, validation units and series volume. State the desired delivery window, destination, Incoterm, spare-cylinder strategy, service-parts requirement and whether future batches must remain interchangeable. If the supplier is expected to support design changes, define the technical review and approval responsibilities.

Aerial work platform cylinder RFQ checklist

• Machine model, height/reach class and cylinder function identified.
• Critical linkage position and required force calculation supplied.
• Bore, rod, stroke, closed/open lengths and envelope defined.
• Mounts, pins, ports, sensors and valve interfaces specified.
• Pressure, flow, motion speed and load-holding behavior stated.
• Cycle rate, holding duration, emergency lowering and synchronization described.
• Unsupported rod length, alignment and side-load conditions recorded.
• Temperature, weather, contamination, storage and fluid data supplied.
• Inspection, testing, traceability and documentation requirements listed.
• Prototype, series quantity, schedule, destination and packaging confirmed.

RFQ omissions that create avoidable risk

• Quoting by platform height alone without linkage and load data.
• Omitting maximum outreach or the most unfavorable boom angle.
• Providing stroke but not closed length, open length or mount datums.
• Leaving load-holding, drift or emergency-lowering criteria undefined.
• Ignoring long-rod buckling and structural misalignment.
• Copying a valve, seal or port specification from another platform model.
• Assuming the cylinder supplier validates the complete machine safety case.