dave1234
08-11-2013, 01:00 AM
Hello. First post on this site- just not getting responses like I used to on " the other" . Open drive D/B big 4,compressor. Customer wanted hemorging service valves replaced. After upon start up and initial charge comp times out and trips oil safety- happens to have spare oil pump- replaced no change- still no oil- pressure and no oil movement in site glass. Came back with a fresh head- realized motor was turning opposite of neighboring comp- also realized I put the oil pump in wrong - it was about 2 am after going 18 plus hours so give me a break-corrected rotation and oil pump installation and wooosh magic oil pressure and movement worked on charging system back up ran for about 45 minutes then bam- same thing no oil pressure no oil movement in site glass. Put a tee on oil circuit port on comp to check oil circuit prime- just spits and gurgles at suction pressure around 15-20 psi is 437A system. Can't understand why it work for 45 minutes then just stop- how do we prevent oil pump from vapor locking , and does anyone know where I can get a exploded view of compressor/IOM manual so I'm not going in blind as i think I need to take end bell off to check oil strainer. DB "tech support" no help. Thanks