Hello everyone,

I have seen on some putzmeister pump they have grease / oil fittings fitted in the end of the delivery cylinders,

Can anyone explain their purpose, what they do, I can't see how they help as the grease/oil will only end up in the water box or am I wrong in saying  that.

Would they be good to have fitted do they give benefits in reducing wear ? Do other pumps have them I don't recall seeing them on others.

Thanks in advance for shedding any light on this.

You're supposed to grease them with the mud cups all the way up so you get grease around the middle of the mud cups. CIFA has it so you grease the dog bone and it pushes grease out the middle of the mud cups. New CIFA barrels have the threaded hole in the top of the barrel so you could put a fitting in the barrel instead of using the dog bone. Pumpstar has the hole in the barrel. 

I don't know how much it helps with wear and tear. I don't think you usually have to grease Putz cups, I'm sure all the barrels come from the same Chinese factory now so it's probably just a generic thing they put in all barrels regardless if you need it or not.

On some model PM pumps this oil system is installed, it places a drop of oil onto the top of the piston to aid lubrication of the cylinders, it is only a drop of Hyd oil about the size of a US Nickel per Stroke. It is supplied from the Accumulator circuit .

It is not Grease on a Putzmeister

Most of the oil is mixed into the water box .

This system also is sending oil to the STube shaft bearings to help keep a positive pressure in the grease hub.

On modern new PM largely these oilers are no longer used.

For further or deeper explanation feel free to contact the PMA CSG 800-890-0269

Or any of your Field service Teck's 

Safe pumping to you all 

TT

This holes are a historic relict.

When using a double lip concrete piston ( mud cup) it was used to squirt oil between the seal lips so they would not run dry. Nowadays single seal pistons are more common and last much longer. They do not need this drop of oil as the water from the water box can reach the sealing lip from behind.

Thanks very much for replying and clearing that up