Actuator For Sale

What are actuators?

An actuator is a mechanical or electromechanical component that converts an energy source — electric, hydraulic, or pneumatic — into controlled motion. In heavy equipment, actuators are responsible for opening valves, extending cylinders, positioning attachments, controlling cab functions, and driving countless other movements that keep machines productive. They are the muscle behind precise, repeatable motion across construction, agricultural, automotive, and industrial applications.

Actuators come in linear and rotary forms. Linear actuators produce straight-line motion and are common in lift gates, dump beds, equipment booms, and HVAC blend door assemblies. Rotary actuators produce torque and are used in valve control, steering systems, and material-handling equipment. Whether you're sourcing replacement parts for a fleet repair or stocking up on bulk inventory for resale, Ritchie Bros. lists actuators in a wide range of sizes, voltages, and pressure ratings.

Types of actuators by power source

The right actuator depends on the load, environment, and control precision required. Three power categories dominate the used market on rbauction.com:

Electric actuators

Electric linear actuators use a motor driving a lead screw or ball screw to deliver clean, precise motion. They're widely used in vehicle systems (including blend door actuators and tailgate lifts), solar tracking, agricultural automation, and any application where compressed air or hydraulic lines aren't practical. They're quiet, energy-efficient, and offer excellent positional accuracy through built-in encoders or potentiometers.

Hydraulic actuators

Hydraulic actuators dominate heavy equipment — excavator booms, loader arms, dozer blades, and dump truck hoists all rely on hydraulic cylinders. They deliver the highest force-to-size ratio of any actuator type, making them the standard for lifting, digging, and pushing applications. Used hydraulic actuators are commonly listed alongside the parent equipment or as standalone replacement components.

Pneumatic actuators

Pneumatic actuators use compressed air to deliver fast, repeatable motion. They're common in industrial automation, brake systems on commercial trucks, and valve control in oil and gas. They're simpler than hydraulic systems, run cleaner, and tolerate harsh wash-down environments — a key reason they're popular in food processing and agricultural equipment.

Electric vs. pneumatic actuators: which to buy?

The choice between an electric and a pneumatic actuator usually comes down to infrastructure and duty cycle. Pneumatic units require a compressed air supply but handle high-cycle, repetitive motion exceptionally well and shrug off dust, moisture, and temperature swings. Electric linear actuators don't need an air system, offer finer position control, and are easier to integrate with modern PLCs and vehicle control modules — but they can be more sensitive to overload and contamination.

For mobile equipment and shop automation, electric is often the easier retrofit. For high-force, high-cycle production environments where air is already plumbed, pneumatic remains the cost-effective choice. Many buyers on rbauction.com purchase both types for mixed fleets and equipment refurbishment projects.

What to look for when buying used actuators

Used actuators can deliver substantial savings over new OEM parts, but condition matters. Review the inspection details on every Ritchie Bros. listing and check for the following before placing a bid:

• Shaft and rod condition: Inspect the extension rod or output shaft for pitting, scoring, or bent geometry. Damaged shafts tear seals quickly and lead to premature failure.
• Seal integrity and leaks: On hydraulic and pneumatic units, look for fluid weeping around the rod seal and end caps. A small leak under static pressure becomes a major one under load.
• Stroke length and force rating: Confirm the stroke, retracted length, and rated force or torque match the application. Mismatched ratings cause stalling, overheating, or mechanical damage.
• Voltage, pressure, and port specs: For electric actuators, verify voltage (12V, 24V, 120V, 230V) and current draw. For hydraulic and pneumatic units, confirm operating pressure range and port size/thread type.
• Mounting hardware and clevis condition: Check pivot pins, clevis ends, and trunnion mounts for wear or elongation. Worn mounting points introduce play that accelerates seal failure.
• Wiring, connectors, and feedback devices: On electric units, inspect the harness, limit switches, and any encoders or potentiometers. Corroded connectors are a common point of failure in mobile applications.

Buy used actuators at Ritchie Bros.

Ritchie Bros. lists actuators across electric, hydraulic, and pneumatic categories — from individual linear actuators and hydraulic cylinders to bulk lots ideal for parts dealers, repair shops, and fleet operators. Listings include detailed condition notes, photos, and specifications so buyers can verify stroke, force, and operating parameters before bidding. New inventory is added daily across rbauction.com and IronPlanet.com, with both timed online auctions and unreserved live events. Browse current listings, set alerts for the specs you need, and bid with confidence backed by 60+ years of equipment auction expertise.