pumps

I just obtained a new lease deal and found the pumps below in the pump room. Some are already sold. I have about 7 left. Will ship. These are expensive CAT self serve pumps. Selling for $100 each plus shipping. Or I will do 7 for $550. I’m located in Dallas, Tx.

I am at wits end. I have a 4 bay. Bay 1 and 4 guns vibrate heavily after a bad winter freeze. Bay 1 more than 4. I have had to turn the PSI down to stop the vibrations. I operate at 1200psi but have it down to 500 so it won’t vibrate. I have opened the valve by the reservoir tank. I have raised...