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Safety switch? I have a YTH1840xp there seems to be no power when the key is on headlights work battery is charged. But if i pull the pto switch and back in i don't hear the click like i use to.Nor will it turn over.I have replaced the battery,solenoid and,the ignition switch as well still nothing.could it be a bad safty switch? if so where are they i know the seat switch, is there one for the PTO and deck? THX TOM

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  • 36 Answers

There is one under the seat and if your PTO switch is bad it could think that the blades are engaged and that would also keep the mower from starting.

Posted on Oct 20, 2013

  • thonas smith
    thonas smith Oct 20, 2013

    Thanks K. Parker the obvious didn't occur to me. Ill replace it

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Posted on Jan 02, 2017

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SOURCE: I have a scotts (made

sounds like safety switch

Posted on Sep 06, 2009

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SOURCE: Cub Cadet PTO will not engage

Do you have a volt meter or a 12 volt test light?..if you do you can see where you are losing your voltage at..but i would suspect the PTO switch is bad..i hope this has helped.....Keith

Posted on Jun 30, 2009

  • 202 Answers

SOURCE: Husqvarna yth2448 pto switch kills motor/battery will not charge

you may hav a bad alt. problem with the mower dying when you engage the pto is most likley a bad sensor or wire unplugged on the seat sensor.the way it works is if the blades are turning and it dosent sense you being on the seat the mower shuts down.this has been standard on mowers for quite a few years now. it keeps the blades from cutting you up if you fall off the seat while mowing. as for charging i would try cleaning the battery connections and get the battery checked first.

Posted on Jul 19, 2009

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Engine will not start. Jumped out solenoid and engine starts but kills when PTO switch is engaged to operate blades. Any ideas?


yes but whats a 12 volt light bulb do that connected across the start solinod when the key is turned to start ?

id bet it don't lite! this is proof theres a high resistance fault in one of your safety switches (very common)

Sep 15, 2015 | Garden

1 Answer

TEST PTO SWITCH from 805 cub cadet


Turn the key switch to the on position. Pull up on the pto and see if you hear the clutch engage. If it does its ok, how ever if it doesn't, it may be the clutch is bad. To check this, unplug the clutch wire from the clutch, turn the key to the on position and check if you have at least 12 volts at the clutch. If you do the clutch is bad. If you don't, you will need to test every safety switch on the unit. The pto will not work if a safety switch isn't working properly.

George

Aug 04, 2015 | Garden

2 Answers

While I was cutting grass the Engine shut down. Pulled the brake up. Push the PTO back down to shut the blades down. I started the engine, engine runs perfect.


try replacing the battery most with an electric clutch PTO have to have a really strong battery as the alternator system is not strong enough by itself

Jun 16, 2015 | Garden

1 Answer

The machine will not start. Absolutely nothing when I engage the key. Battery good


When I turn the key nothing happens.
There are several elements that go into cranking (turning over) the engine.
  1. Battery
  2. Fuse
  3. Key Switch (and wiring)
  4. Starter Solenoid
  5. Starter motor
Let's start with the battery. The quickest way to make your initial check of the entire starting system and particularly the battery is to get a jump. Yep, get some jumper cables and jump the mower off your car. Turn the key and try to start it in the normal fashion. If it starts cool! It is likely a bad battery.
  • Charge the battery for a few hours, on a charger.
  • Then perform a voltage measurement of the battery.
  • Switch a volt meter to DC Volts and clip it to the battery. It should read between 12-13 volts. If not the battery is suspect.
Now let's check the starting system while bypassing all the safety switches and wiring. How? You can perform this test simply by jumping the starter. Hold a wrench or fat screwdriver across the two large posts of the starter solenoid. This bypasses the key switch and all safety devices and directly drives the starter. Your starter will crank if the battery and starter are good and the engine is not locked up. Don't crank it for more that a couple seconds. You just want to verify the battery and the starter are both in good shape. (The engine will crank but not start during this test if the key is off, or if the safety switches and wiring are damaged, or in the no start/run positions.)

If the starter cranks try one more test. Run a small jumper wire from the positive post of the battery to the little terminal on the solenoid. You may have to take the small wire off the terminal, on the starter solenoid, in order to do this. When you apply this current from the battery to the terminal it should make the solenoid activate and the starter crank. This test bypasses the key switch and shows you the starter system is working. You could do this test first, if it works you do not need to do the first more basic test.

If these tests cause the engine to crank, but it will not crank with the key, then you know that you have a problem somewhere in your starter wiring and safety switch system.

Most modern riding mowers have the following safety switches:
  • Seat switch
  • PTO switch
  • Reverse switch (RIS) and Reverse Relay (RIO)
  • Brake/Clutch switch
If you need detailed instruction for testing your wiring and safety system, I will need your complete machine info.
  • Make
  • Model
  • Year
  • Engine Model
  • Transmission Model
  • Deck Size.

On a John Deere (100 series) the starting current flows through the following items in this order:
  1. Battery to Fuse then to the Key Switch.
  2. With key switch in the start position, Key Switch to PTO.
  3. With PTO off, PTO to Brake/Clutch
  4. With Brake/Clutch Pedal all the way down, the current flows to the starter solenoid.
  5. If the Starter Solenoid is in good shape, the solenoid connects the battery to the Starter and the engine cranks. Cranking does not mean running; it just means the engine turns over. Running is dependent on many other systems.
This list of components are all part of the cranking/starting system. They can prevent the Starter Motor from cranking when you turn the Key Switch.

The RIO is the Reverse Implement Option. It is a switch that latches and stays latched under certain conditions. It is activated by the RIS. The RIS is the Reverse Implement Switch. It activates the RIO. These two separate components work to allow the blades to spin while going backwards (without killing the engine)

The Seat and the RIO (the reverse latch not the button) are tied into the engine kill system by grounding the Coil. This same system controls the fuel shut off value beneath the carburetor. The Seat and RIO can keep the engine from running but they will not prevent the Starter Motor from cranking. Therefore, it you turn the key and nothing happens, it has nothing to do with the Seat and Reverse switches.

Note: In the run position, from the Key Switch, power flows to the Hour Meter, then to the RIO latch relay (not the RIS button), then to the fuel shut off solenoid. If you do not hear the Fuel Shut off Solenoid clicking on and off when you turn the Key Switch from off to run, there may be a problem in this circuit; including a possible problem in the Hour Meter. Of course none of this affects the cranking circuit. Your engine will still crank, it just won't run.

Apr 10, 2015 | Garden

1 Answer

Why wont john deere stx 30 pto wont engage


Most of these mowers have a safety switch between the PTO switch and clutch. A safety switch or relay is most likely the problem. Hope this will help ya.

Jul 19, 2014 | John Deere Pto Clutch For Stx38 And Stx46...

1 Answer

Ignition acting funky


With many of these Tractors, as part of the safety B.S., much of the electronics run through the PTO switch. Power to the ignition runs through the PTO.

Jan 04, 2014 | Craftsman Garden

1 Answer

Kohler CH640-3075 (one year old and in a Grasshopper 720K) will not turn over. Battery charged.


check fuses first. then check starter solenoid for proper power and then this will lead you to either a safety switch issue or a power issue...

turn key on, pull pto switch... does pto engage, then your problem is at or after the key switch

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1 Answer

Pto, electric clutch


check the wires they rub on sharp edges

Mar 23, 2012 | Husqvarna Garden

1 Answer

Cub Cadet PTO will not engage


Do you have a volt meter or a 12 volt test light?..if you do you can see where you are losing your voltage at..but i would suspect the PTO switch is bad..i hope this has helped.....Keith

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