This is a pumping unit double action type with plungers of different diameters.

The plunger having larger diameter pumps larger quantities of oil into the jack.

Whereas the plunger having smaller diameter pumps oil in smaller quantities but effortlessly these plunger are very accurately machined and fit in their respective cylinders with zero clearance, no seals are used.

Special non-return valves are fitted in the pumping unit to ensure correct level of Hydraulic oil.

On the front is fitted a release valve, which is to be tightened while applying pressure and loosened to release it, Provision is also made to fix a pressure gauge on the pumping unit, 

These pumping units are connected to load frame by means of pressure pipes.