The story behind these pictures is rather curious - the Rexroth A4VG
pump is the heart of a closed loop transmission of a small airport
luggage towing vehicle. It had suffered a major failure and was
completely rebuilt. The whole circuit had been thoroughly cleaned
before the start-up, low pressure lines included. The only(!)
hose that hadn't been dismounted and cleaned was the hose and the
fitting you see on the pictures. The pump blew out (literally!!!) two
shaft seals before the line obstruction was discovered. As you may have
already guessed - the metal debris blocking the drain line are legacy
of the previous failure...
