Pump repair video30/04/2019
Get the most from your HARDI pump
The HARDI diaphragm pump is a foundation stone of our history – and the heart of your sprayer. HARDI still makes the pumps in-house, in Denmark, from precision-forged steel components and long-life polyurethane diaphragms.
A video on HARDI International’s YouTube channel shows how easy it is to understand, maintain and repair your HARDI diaphragm pump – adding years to its life.
Hosted by HARDI’s Academy Manager in Denmark, Anthony Facchin, the clip shows the very simple steps involved in disassembling, repairing and lubricating the pump. It only takes a few tools and a set of parts to replace the diaphragm and valves if they become worn (usually indicated by a leak) and the result can be many, many extra years of reliable service.
So take a few minutes to watch How to repair your HARDI Diaphragm Pump now.
(Or go to youtube.com/user/HARDIsprayers/playlists any time, and click ‘Instructional Videos’.)
See inside a HARDI Pump
For a fascinating look at how the HARDI pump comes together, you might also enjoy From parts to product: The diaphragm pump which is also on HARDI International's YouTube channel.
The design and operation of the HARDI pump is simplicity itself, which goes a long way to explaining their durability and success. They’re a lot like a two-stroke engine really, except the crankshaft drives the piston instead of the other way around.
The ‘piston’ is, of course, the flexible diaphragm. As the connecting rod pulls that down, fluid is sucked into the chamber in the ‘cylinder head’ through a one-way valve, then forced out the pressure-side valve (the exhaust valve in our reciprocating engine example) as the diaphragm is pushed back up. Apart from galleries feeding fluid into and away from the low and high pressure valves, that’s about all there is to it.
Along with simplicity, the benefits of this design include the robust construction and the fact that the few moving steel parts and their bearings are completely isolated from the fluid. The flexible diaphragm also means there’s no danger of cavitation if the pump is run dry.
All in all, it’s the perfect agricultural pump. Just grease and go… and go, and go, and go!