RandyB(MI)
Well-known Member
I'll try to keep this short. '74 1070 , put new bearing/seal in compressor (York). Charged air last nite. Used jumper wire to comp to fascilitate faster charge. Everything worked great. At 1500 rpm and full air just about froze cab. This morning , buttoning things up. Hooked factory wire back to comp. Would not cycle or kick in clutch. Hot wired to make sure charge didn't leak out over night and it blew very cold again. Still charged. Checked voltage at wire,11.52. Set meter on frt tire and from inside cab, turned switch on/off several times. Meter "0" when off and 11.50 +/- when on. Takes 12.5 to energize apparently 11.5 won't do it. Set meter on amp draw between batt voltage and wire to comp. Naturally clutch energized and meter read 3.95-4.00. One spec in serv man says 4.44 another page says 2.7 - 3.3. Maybe different brand comp or updated spec who knows. My 3.95 seems to fall right in the norm either way. Bottom line is , both hi and low pres sensors are working because I,m getting same voltage whether I by pass them or go through them. won't do anything. What am I missing here? Are they that sensitive and if they are then thousands of them have likely to have been replaced? Every bulb, electric item on this tractor works perfect and so does the air when it has 12.5 volts. SOOOO close but no cigar. Somebody's had this problem sometime. They are all made the same. Any help welcomed. RB