GT 275 Starting Issues
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    JDVT802's Avatar
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    GT 275 Starting Issues

    So now that I have actually used the tractor to mow it has some issues. I'd rather figure out what it is myself because it is a hassle to have to bring it anywhere for the most part. It seems like something simple because when it is running it runs fantastic.

    It starts when it is cold, but after I run it a bit it will not start again...and after it has bee run for a bit if you shut off the mower it will not engage again.

    I have a spare PTO switches and it is not the switch.

    I did hook up the battery and it is 11.6 V but is at 66% which seems to be not right...though I do not really understand where the not starting again when it is warm plays into that...nor that the mower will not engage.

    Some advice would be greatly appreciated....and I did do some research and have seen...battery, switches, fuses, vapor lock, coil.
    1997 GT275

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    JDVT802's Avatar
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    And actually after just running it a bit it will not start...battery now at 11.1 V and 61%
    1997 GT275

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    Fozsey's Avatar
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    Quote Originally Posted by JDVT802 View Post
    And actually after just running it a bit it will not start...battery now at 11.1 V and 61%
    11.1 is low. Do you have another battery you can try? And have you checked the voltage with it running.
    Last edited by Fozsey; 05-11-2018 at 06:39 PM.


    ~Brian~

    1998 425/54 Deck/650 hours | 1998 455/60 Deck/54 Blade/1300 hours | 2003 GX345 48 Deck/47 Blade/Electric Pivot/900 hours (sold)


    Yes I have an addiction and no I don't want help


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    JDVT802's Avatar
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    No but I just ran it for a bit and finished mowing my lawn. Now itís reading an even 12 and 78%.

    I donít get the PTO switch part. Why would the mower not engage due to a wonky battery?
    1997 GT275

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    Fozsey's Avatar
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    Quote Originally Posted by JDVT802 View Post
    No but I just ran it for a bit and finished mowing my lawn. Now itís reading an even 12 and 78%.

    I donít get the PTO switch part. Why would the mower not engage due to a wonky battery?
    Not related. When you say start, do you mean it won't crank? A faulty pto switch disables the crank circuit the same as a faulty seat switch. Cranking but not starting is an entirely different animal.


    ~Brian~

    1998 425/54 Deck/650 hours | 1998 455/60 Deck/54 Blade/1300 hours | 2003 GX345 48 Deck/47 Blade/Electric Pivot/900 hours (sold)


    Yes I have an addiction and no I don't want help


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    JDVT802's Avatar
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    Quote Originally Posted by Fozsey View Post
    Not related. When you say start, do you mean it won't crank? A faulty pto switch disables the crank circuit the same as a faulty seat switch. Cranking but not starting is an entirely different animal.
    No I mean when itís running Iíll shut the mower deck down and it will not engage again and turn on.
    1997 GT275

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    JDVT802's Avatar
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    But it only does this after itís been running a bit. On initial start up when it has not been running everything works fine.
    1997 GT275

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    Did you try changing the battery before checking the at rest voltage?
    Any 12 volt electrical system can give you various problems if it's only seeing 11 volts. The battery should have no less than 12.5 sitting charged.
    After you are 100% the battery is good you need to check if the charging system is working.

    Low voltage especially plays hell with electronic components. Could be why the PTO clutch stops working.
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    Fozsey's Avatar
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    This is where I was initially headed when I asked about the battery. I have a 425 that had a similar issue and would crank just fine but if it managed to start it would backfire and run like ****. Early on I assumed the battery was ok because it was cranking. This wasn't the case. The battery was bad and after replacing it, the problems went away. The charging systems in these don't have the ability to close the gap on a weak battery with the exception of most of the diesels for a short time anyway due to an actual alternator based charging system. Even then, its a bad idea to push them.

    If your battery is in a state of discharge either because its weak or because the charging system is not functioning it is reasonable that running for a time disables the pto clutch. The clutch is magnetic and requires a certain number of working amps from your battery to engage. Only knowing the voltage at rest is misleading even though yours is clearly low. The only way to verify battery capacity is a load test. If you don't have a load tester you can put your voltage tester on the battery during the crank cycle. This is where you should see your 11 volts because the battery is under load. After the engine is running the voltage should jump back up to the 13v area and maintain.

    The next consideration is the type of battery garden tractors have. Most, yours included, are U1 utility batteries. They are small, relatively cheap, and not reliable for more than a season or two. That's not to say they wont go longer but when they start failing they will exhibit some strange behavior as you've figured out.

    Regardless of there being other issues you have to start with what you know is an issue. Correct this and you can eliminate it and move on to the next if there is one which I suspect might surprise you.
    H-D dealer dude likes this.


    ~Brian~

    1998 425/54 Deck/650 hours | 1998 455/60 Deck/54 Blade/1300 hours | 2003 GX345 48 Deck/47 Blade/Electric Pivot/900 hours (sold)


    Yes I have an addiction and no I don't want help


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    JDVT802's Avatar
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    Iíll report back with my findings.
    1997 GT275

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