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7020 air conditioning belt
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tomNE View Drop Down
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Joined: 13 Sep 2009
Location: dorchester, ne
Points: 1225 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tomNE Quote  Post ReplyReply Direct Link To This Post Topic: 7020 air conditioning belt
    Posted: 16 Jun 2016 at 7:05pm
  I've been having problem with the belt about every year.   they wear the sides out and they squeal when the compressor kicks on, usually the second time.  the second time there is more head pressure.   I went to NAPA and asked for a heavy duty belt.    none available.  I then told them my problem.   they then went into the belt book and ordered a belt by length and width.  I installed it last night, so by the end of the weekend, i should know more.   this tractor only has 6000 hours, so i wouldn't think the pulleys should be worn out.   Anyone else had this problem?
AC from the start of my families farming career till the end!
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jun 2016 at 10:18pm
How much pressure are you running on hi side? 134A or R12? Has radiator and condenser been washed out lately?      MACK
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tomNE View Drop Down
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Joined: 13 Sep 2009
Location: dorchester, ne
Points: 1225 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tomNE Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jun 2016 at 10:22pm
134a   proly 140 on topside, depending on outside temp.  i keep the condenser fairly clean.
   my problems usually occur if i shut down the tractor to fill the drill or answer a phone call.   when i start back up, it's tricky to get compressor going again.
AC from the start of my families farming career till the end!
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SHAMELESS View Drop Down
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Joined: 13 Sep 2009
Location: EAST NE
Points: 29486 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SHAMELESS Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jun 2016 at 11:45pm
can you try a little belt dressing on it? don't take much
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21569 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jun 2016 at 6:00am
That belt is very long and needs to be kept tight. I'd prefer to see the shortest belt possible, as the more you slide the idler out to tension the belt, the less degrees of wrap there is on the A/C clutch pulley. A good quality belt stretches less under load. Is there a chance the expansion valve might not bleed off quite as fast as it should, causing a high load upon clutch engagement??
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tomNE View Drop Down
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Joined: 13 Sep 2009
Location: dorchester, ne
Points: 1225 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tomNE Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jun 2016 at 6:51am
  I know just enuff about the interworkings of AC systems to be dangerous.   but the expansion valve theory is somethings i will check out.   thank you!
AC from the start of my families farming career till the end!
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