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A detailed buying guide: how to choose an air-hydraulic jack.
This section covers air-hydraulic jacks: long-handled trolley jacks with a multi-stage telescopic ram, such as two-stage 50/25 t or three-stage 80/40/20 t models, as well as 20–50 t bottle-type air-hydraulic jacks. Their hydraulic pump is driven by compressed air from a workshop compressor, and some models also have a backup hand pump. They are used for servicing trucks, buses and agricultural machinery and in tyre shops, where a heavy axle must be lifted quickly and without physical effort. An electric or petrol compressor of matching output is required; for manual hydraulic models, read how to choose a hydraulic jack.
Multi-stage trolley jacks are easy to position under truck and bus axles, while bottle-type models are compact and suit agricultural machinery and roadside work. On a multi-stage jack, capacity drops with each subsequent stage (for example 80/40/20 t), so compare the load with the capacity of the stage at which it will be lifted. See what pneumatic tools are and how they work and how to choose hydraulic tool load capacity and working force.
Trolley models usually have a minimum pick-up height of 150–250 mm and a maximum lift height of 400–600 mm, depending on the number of telescopic stages. Check for extra extensions and interchangeable saddles that let you adapt the jack to different axles and frames. Read how to choose a hydraulic cylinder or ram.
Most air-hydraulic jacks operate at 7–12 bar and have a 1/4" air inlet for a quick coupler. At lower pressure the jack may not lift its rated load, so the compressor must provide the required pressure and air flow. Read how to choose compressor working pressure and how to calculate compressor air delivery.
Lifting speed depends on the air-driven pump and the number of stages: the first stage is usually the slowest but the strongest. The release valve should allow smooth, controlled lowering of the load, and the control valves should be operated from the handle. See how to choose hydraulic hoses, couplers, valves and pressure gauges.
The overload (safety) valve limits pressure and protects the jack from loads above its rating. Never work under a vehicle supported only by a jack: after lifting, place jack stands of matching capacity and work on a level, solid surface. Read how to use hydraulic tools safely and how to use pneumatic tools safely.
Use the hydraulic oil specified by the manufacturer, check its level regularly and bleed air from the system. Oil leaks or slow sinking under load indicate worn seals, which should be fixed with a repair kit. See how to store and maintain hydraulic tools.
Trolley models weigh 40–90 kg, so sturdy wheels, a long folding handle and air control valves mounted on it are important. Also check the availability of spare wheels, seals and saddles. Read how to choose spare parts for pneumatic and hydraulic tools.
Moisture in compressed air damages the air motor and seals, so install a filter/water separator in the line and, if required, a lubricator. Drain condensate from the compressor tank after work. See how to prepare compressed air: condensate, filters, regulators, and lubricators and how to choose an air compressor.
At ToolsArmenia you can compare air-hydraulic jacks by type, capacity per stage, pick-up and lift height, working air pressure and weight and choose the right model for your vehicles.
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