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Is there a safety limit switch on the parking brake of a Gravely ZT50? Battery is good but wont start.

I have a Gravely ZT50 that has had issues starting before. I suspected a safety switch on the parking brake, but can not locate one. I can hear the pto engage and disengage when i pull the switch, I jumped the seat switch harness just to be sure that wasnt the problem...is there a limit switch somewhere on the parking brake?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: pto wont work

try and bypass the safety switch on the clutch/brake pedal

Posted on Apr 13, 2012

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SOURCE: Craftsman DLT2000 turn the key and the hour meter does not come on and mower will not start? I've replaced the battery, solenoid, ignition switch and have verified seat switch and brake/clutch sw

check the fuses taped to the harness

Posted on Jul 13, 2012

radco855
  • 136 Answers

SOURCE: Can malfunction of PTO or other safety switches prevent start up of mower

You didn't state the model or brand of tractor, but usually the way the cranking circuit work is, from the "S" terminal of the ignition switch, the circuit runs to the PTO switch, if it's in the OFF position, the circuit then runs to the pedal switch, if it's in the DOWN (or brake on) position it then runs to the solenoid. On other tractors, from the ignition switch, the circuit runs to the pedal switch first. (The seat switch isn't used in the cranking circuit).

Any switch can go bad, but I would more likely suspect the pedal switch or loose connection at either switch. (But it could actually be the PTO switch).

Try tracing the circuit from the "S" terminal of the ignition switch through the PTO or pedal switches to the starter solenoid. You may get lucky and find something obvious.

If you find nothing, try jumping across the pedal or the PTO switch (only two terminals are used in the cranking circuit, trace back to ignition switch for the incoming, outgoing is usually directly adjacent). Jumpering will take these out of the circuit and tell you if either is bad internally.

Lastly, there's always the possibility that the ignition switch is bad. (Doesn't happen all that often, but it's suspect as well). Jumper from "B" terminal to "S" terminal will take it out of the circuit.

Posted on Aug 22, 2012

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This website video shows how to check the component. Your model would be similar.
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STANDARD MOTOR PRODUCTS Part # NS113T [NUETRAL SAFETY SWITCH]


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