Hydraulic Hammer Power Packs

A hydraulic power pack is a portable power source for impact tools. Its motor drives a pump delivering oil at 100–160 bar to a tool joined by two hoses with quick couplers; the oil returns to a 15–30 l tank through a filter and a cooler. The pack itself breaks nothing — it feeds a breaker or a disc cutter. Needing neither mains power nor a compressor, the set works in trenches and on emergency utility repairs.

Flow follows the EHTMA class stamped on the tool. Class C, the most common on site, calls for roughly 20 l/min at around 138–140 bar; heavier class D needs about 30 l/min. A class C breaker fed by a 13.5 l/min unit hits slower and softer, while excess flow raises oil temperature and strains the valve block. If the tool fleet is set to grow, a pack one class up with adjustable flow is the safer buy.

The site decides, not the power rating. An engine-driven pack runs without mains power and suits trenches and open ground, at the cost of noise and fumes. An electric version on 230 V or 400 V runs quietly and emits nothing, so it is the only choice for warehouses, tunnels and car parks. Oil flow is often identical — around 20 l/min in EHTMA class C.

Hydraulic drive carries energy in oil at 100–160 bar, pneumatic drive in air at roughly 6–7 bar. A mid-weight pneumatic breaker calls for a compressor rated at some 2–5 m³/min — a heavier and louder machine than a 20–30 l/min power pack. The hydraulic set stays compact and loses little over long hoses, which is why it wins on spot demolition and emergency utility work. A compressor pays off where it feeds several tools at once.