Can tractor respond with 0 battery load power and good volts? Interesting story.....
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Thread: Can tractor respond with 0 battery load power and good volts? Interesting story.....

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    Can tractor respond with 0 battery load power and good volts? Interesting story.....

    My tractor wouldn't start so I brought the battery to John Deere, they tested the battery and said the cells are good and it works fine, they recommended other services, but I declined and came home to ask my neighbor (lawn tractor mechanic). He said the engine was seized due to running on barely any oil, he was right about the oil, and recommended a new engine. I bought a battery load tester, the volts ran good but the load detected a zero reading. I asked John Deere if the mower should start with a zero load, and they didn't provide any info, said they couldn't diagnose over the phone. My neighbor mechanic said the battery ran good until the mower seized, so battery should be good and the volts test good.
    I know I need a new battery, but with a zero load detection could this in fact cause the mower to not have any response even-though the volts test good?

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    jgayman's Avatar
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    I'm not quite sure what you mean by zero load detection. However, some times a bad battery will read close to normal voltage when nothing is attached but then drop to near zero volts as soon as you attach any type of load.
    farmgirl19, AlKozak, Kusa and 3 others like this.
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    goat704!'s Avatar
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    If your motor is seized no battery is going to help get it going.
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    Tchest, Remove spark plug(s) and see if motor will turnover by hand. If motor is in fact seized, don't worry about a battery! If motor turns by hand, start checking from starter back to ignition switch...looking for voltage or no voltage. Bob
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    Quote Originally Posted by jgayman View Post
    I'm not quite sure what you mean by zero load detection. However, some times a bad battery will read close to normal voltage when nothing is attached but then drop to near zero volts as soon as you attach any type of load.
    There's a range on the battery detector, zero being the lowest when detecting the load power. I used the 100 Amp 6/12V Battery Load Tester by Cen-Tech.

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    Quote Originally Posted by goat704! View Post
    If your motor is seized no battery is going to help get it going.
    I know, I just didn't know if the seized engine diagnosis was wrong. I have to get my tractor back to put a new battery in, but in the meantime was trying to get more knowledgeable if the tractors engine was good, could it still not start or have any response with a battery that has good volts (fully charged) but no load power.

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    Quote Originally Posted by rwmeyer View Post
    Tchest, Remove spark plug(s) and see if motor will turnover by hand. If motor is in fact seized, don't worry about a battery! If motor turns by hand, start checking from starter back to ignition switch...looking for voltage or no voltage. Bob
    Thanks Bob! My mechanic currently has the tractor, but he's the one who diagnosed it as being seized. He didn't tell me how he determined this, he's a little rough around the edges to talk to. I appreciate your help, and may check into this when I get the machine back.

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    AlKozak's Avatar
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    Quote Originally Posted by jgayman View Post
    I'm not quite sure what you mean by zero load detection. However, some times a bad battery will read close to normal voltage when nothing is attached but then drop to near zero volts as soon as you attach any type of load.
    I'm mystified by that as well. Best guess:

    Any power source can be modeled using a Thevenin equivalent circuit. This consists of a theoretical battery that can supply infinite current @ 12V in series with a resistor that represents the battery's internal resistance. In order to be able to supply 100A, that resistor value needs to be very low - a fraction of an ohm. Using Ohm's law, you can put a load of known resistance across the battery, measure the voltage across it, and calculate the value of the internal resistance. If it is too high then the battery will be unable to source 100A at anything close to 12V.

    Al
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    jgayman's Avatar
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    Quote Originally Posted by tchestman88 View Post
    Thanks Bob! My mechanic currently has the tractor, but he's the one who diagnosed it as being seized. He didn't tell me how he determined this, he's a little rough around the edges to talk to. I appreciate your help, and may check into this when I get the machine back.
    As a previous poster suggested, remove the spark plugs and see if it spins with the starter. You can also remove the flywheel shroud and rotate the engine by hand (with spark plugs removed).

    If it spins by either method above it is not seized. BUT - you may still have other internal issues from running with low oil.
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    Quote Originally Posted by tchestman88 View Post
    There's a range on the battery detector, zero being the lowest when detecting the load power. I used the 100 Amp 6/12V Battery Load Tester by Cen-Tech.
    The electronic testers are nice for some things but I sometimes like to do a quick test with a simple analog load tester. You can usually pick these up for around $20. If you can't stay within the green range for a few seconds the battery is toast.
    Attached Thumbnails Attached Thumbnails load_tester2.jpg  
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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