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  1. #1
    Bronze Member
    Join Date
    Jul 2006
    Posts
    86
    Location
    Louisville, KY
    Tractor
    NH TC 29D Super Steer, NH 1925

    Default PTO indicator light

    I have a TC29D

    I can't get the PTO indicator light to come on when I get the RPM up. During the start up The green 540 comes on and the red 600. but ther seems to be something wrong with whatever the sensor is that gives you the indication when operating.

    Any thoughts as to where to check or some solution, will be great.

    Thanks,
    Neil

  2. #2
    Epic Contributor
    R.I.P.
    jinman's Avatar
    Join Date
    Feb 2001
    Posts
    21,014
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: PTO indicator light

    Neil, my TC45D has the same problem. It's been that way for over a year. I've not taken the time to troubleshoot it because I know that the light comes on around 2600 rpm, so I just use the tach as a reference. Sorry, I can't be much more help. It is baffling that the lights test normal at start-up and then don't work. Mine does exactly the same thing.
    Jim


  3. #3
    Bronze Member
    Join Date
    Jul 2006
    Posts
    86
    Location
    Louisville, KY
    Tractor
    NH TC 29D Super Steer, NH 1925

    Default Re: PTO indicator light

    Thanks Jin,

    Its good to know, however dishartning, that I don't have a unique problem. Maybe someone else can shed some light.

    I think my tach speed should be around 2400.

    Thanks,
    Neil

  4. #4
    Epic Contributor
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    jinman's Avatar
    Join Date
    Feb 2001
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    21,014
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: PTO indicator light

    Yesterday, while mowing, I revved my engine a little high and the 600 rpm light came on. Only the green 540 light does not work except for the self-test when I first start the tractor. Since I know the bulb is good, I'm a little baffled. This is interesting and I may have to look into it a little more. I'll look at my repair manual diagrams and do some research.

    Well, the prognosis ain't good. Here is what the Repair Manual says:

    NOTE: The 540/600 PTO indicator lights on the instrument panel are illuminated by a signal from the tractor tachometer. The PTO must be engaged for these lights to operate. The 540/600 indicator light circuit is part of the instrument panel printed circuit board and cannot be serviced, except for the indicator bulbs. If the 540/600 indicator lights malfunction, replace the instrument panel.

    Can you imagine that? I don't think I will be spending $300+ just to get that green 540 light to operate. I'll just keep using my tach.
    Last edited by jinman; 06-28-2009 at 09:03 AM.
    Jim


  5. #5
    Bronze Member
    Join Date
    Jul 2006
    Posts
    86
    Location
    Louisville, KY
    Tractor
    NH TC 29D Super Steer, NH 1925

    Default Re: PTO indicator light

    This is a sorry admission of a weak link. What else is going wrong with our insturment panel?? I wonder if we have some electronic guys on the net that might shed some light on a way to repair rather than the typical "just buy parts"

    Jin, Maybe you and I are the only ones that would like this function to operate, since the manfg felt the need to have the indicator in the first place

    Best,
    Neil

  6. #6
    Epic Contributor
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    jinman's Avatar
    Join Date
    Feb 2001
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    21,014
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: PTO indicator light

    Well, my instrument panel is magic; it healed itself. Wow! Yesterday, while mowing, I looked down and my 540 rpm light is working normally. I increased the rpm and the 600 light came on too. I got an inch of rain and my PTO llight started working. What more could I ask for?

    My guess is that this light problem is related to a loose or dirty connection somewhere or maybe a broken trace on a printed circuit card.

    BTW: The PTO light is just on "Deluxe" model tractors. Economy models have an indicator of PTO speed silk-screened onto the face of the tachometer dial. Why they didn't just leave the silk-screen marks on our Deluxe models is beyond me. You would think one part would sure be cheaper to make than two parts, and we would have a backup method of reading PTO speed. Oh well . . . .
    Jim


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