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7020 tac playing tricks
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youngorange2000 View Drop Down
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Joined: 27 Mar 2019
Location: eastcentral MN
Points: 314 		Post Options Post Options   Thanks (0) Thanks(0)   Quote youngorange2000 Quote  Post ReplyReply Direct Link To This Post Topic: 7020 tac playing tricks
    Posted: 25 Apr 2023 at 7:32pm
The tach on my 7020 started a new trick this year. I will start the tractor and the tac will work for about 5 minutes then nothing. It's done this three times this year. Last year about every other time I used the tractor I would start the tractor the tac wouldn't work for the first few minutes then it was like a light switch and it would work and stay working. Is there a pickup sensor somewhere that's finally given out? Thanks
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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: 25 Apr 2023 at 8:57pm
First thing, tighten fan belt. If  alt. pulley is Shiney in the bottom, replace pulley and belts.                  MACK
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 87075 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 2023 at 9:28pm
Luke, the tach gets its signal from an output on the alternator...
Like them all, but love the "B"s.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 87075 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 2023 at 9:32pm
https://www.allischalmers.com/forum/7020-alternator-issues_topic150296.html

Like them all, but love the "B"s.
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Joe(OH) View Drop Down
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Joined: 11 Sep 2009
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Points: 991 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe(OH) Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 2023 at 8:42am
I had something similar years ago on a 7000 and a 7020.  Wasn't long after playing that trick that it needed a new alternator.  
Life is simpler when you plow around the stump.
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youngorange2000 View Drop Down
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Joined: 27 Mar 2019
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Points: 314 		Post Options Post Options   Thanks (0) Thanks(0)   Quote youngorange2000 Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2023 at 9:20pm
Belts are tight doesn't change it all wire connections are tight on the altinator
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Jack(Ky) View Drop Down
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Points: 1153 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jack(Ky) Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 2023 at 8:10am
My 7020 did that and it was the alternator going bad.
'59 D14 '68 170 Diesel '81 7020 40 All Crop
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