Keith and Ed, getting back with Info on AC for C-12. What you should have on your engine is a
Air Compressor Model EL-740 which is made by Midland and yes the governor is a off parts house
shelf and can be adjusted.
Cat has a new model built Bendix Duraflo 596 which replacees the Bendix TuFlo 1400 but you do not have
that model because if you do air pressure is different and fast recover air flow. possible Mod 1400
Going back on a few thing to check to make sure problem is not with the air flow and delivery on
your Air Compressor. ( slow recover rate air delivery ) dirty filter for Air Compressor, carbon buildup
in discharge line that is connected to air compressor ( that is the Steel braided air Line about 2 feet
long. air pressure time to build air from 85 psi to 110 40 seconds or less. compressor cut-in 90 psi,
compressor cut-out 120 psi these are thing that would make for slow air recover.
Reason you do not have the new style Bendix 596. the governor cut-out is 130 psi, governor
cut-in at 110 psi, air pressure time to build air from 85 psi to 110 psi 25 seconds. you need to get air compressor model number off tag on a/c/ this moder has a different type of air governor that
only be replaced and not adjusted in the field, very unlikly you have this updated model.
What information I found about troubleshooting is for a Cat C-12 2KS S/N with your air system off
Cat Service Information System. Again first thing to look for can you build air from 85 to 110 in 40 sec.
I mentioned yeserday about carbon build up in the discharge line off A.C. ( need to remove both end
of hose) and the air filter for A.C. this will tell you what you need to find problem. last thing the Air
governor for your A.C. can be adjusted. If perhaps you do have the new updated Bendix Mod 596,
than air system will need to be reset. Dave