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7000 series cab blower fan speed
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Tim NH View Drop Down
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Joined: 16 Oct 2012
Location: Lancaster NH
Points: 1125 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tim NH Quote  Post ReplyReply Direct Link To This Post Topic: 7000 series cab blower fan speed
    Posted: 09 Jun 2020 at 8:28am
I have the two speed fan switch. Low speed isn't working anymore, it just stays on high. Is it safe to figure I just need to order a new switch. 
1950 WD 1959 D14 1955 WD45 1976 7000 B 207
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8619 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jun 2020 at 10:46am
Low speeds are obtained by running power through a resistor. It's probably burned out. On my 8000 there is a resistor block the switch and fan wires plug on to. It's probably not the switch. You need to diagnose it,not throw parts at it.
....parts book for 7060 shows a 3 speed switch which has the resistors built in....


Edited by SteveM C/IL - 09 Jun 2020 at 10:52am
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AC7060IL View Drop Down
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Joined: 19 Aug 2012
Location: central IL
Points: 3532 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AC7060IL Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jun 2020 at 1:50pm
Try removing the 7000 series’ cab top cover & look over that area’s cavity(blower switch, temp control switch, radio, etc). Mice love to overwinter up there. The cab’s hollow rops side posts allows mice an express route from lower cab cowling to upper cab roof were they chew up even more electrical wiring.
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Tim NH View Drop Down
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Joined: 16 Oct 2012
Location: Lancaster NH
Points: 1125 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tim NH Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jun 2020 at 2:54pm
Not far from the blower motor are low and high connectors. Both were oxidized, but one was real bad. So low speed works again. Back a few years ago i ran into the same problem.  My old one ton sits all winter. Come spring I needed to use it at night, and had no lights. Fuse was good, so after looking for an hour I put a new fuse in. The lights came on. I looked at that old fuse, there was heavy gray oxidation on it compared to a new one. 
1950 WD 1959 D14 1955 WD45 1976 7000 B 207
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