OMCN 357 is a pneumohydraulic pump supplied with a flexible hose and quick coupling, used to power body-repair hydraulic equipment faster and with less physical effort than a purely manual pump. It operates up to 700 bar, with a stated flow rate of 0.7 l/min and a 1,100 cm³ reservoir.

It is especially useful in body shops with frequent pulling or pushing cycles, on straightening benches, during chassis-rail straightening and for repetitive work on commercial vehicles. The quick coupling makes hydraulic-tool changes easier, but does not replace checks for cleanliness, compatibility and full coupling engagement.

For an efficient cycle, verify compressed-air availability and quality, comply with the hydraulic circuit pressure rating and select the cylinder by force, stroke and oil volume. The pump must not be used to compensate for an unstable setup: the reaction point, accessories and workpiece must remain restrained and correctly aligned.