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  #1  
Old 11-19-2007, 05:21 PM
Fubba Fubba is online now
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Strange Problem with Exmark: Cut blades on, engine turns off...

Happened today. Let me start off by saying that it ran great last week. It's a Exmark Lazer Z HP 23hp 52". Last day I used it was Friday. Everything ran perfectly, the way it has since I bought it. I bought the mower August 2005. (Ironic how the warranty runs out huh) It now has right at 500 hours on it. Most of them happening this year. I get on it today, and the battery is dead. First time that's happened. I carry a small jumper, so once I jumped it off, I hopped on it to do a yard. I cut the blades on, drive about 1/4 pass, and the mower cuts off. So I check gas (level's fine), and jump it off again. This time, I cut the blades on and once the blades get up to speed, the mower begins to shut off. I then push the blade switch back in, and the mower runs fine. I did this several times. The mower will not run with the blades on. I know the parking brake is linked to this switch, but so are other things, and I would think if something was amiss there, then other things would not be working right. Could it be the PTO switch itself? Any ideas? Remember, it also sucked my battery dry over the past two days, whatever it is.
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Old 11-19-2007, 05:31 PM
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Restrorob Restrorob is offline
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First thing you need to do is install a new battery, After all it is 2 yrs. old ?

Once you get a new battery installed check your charging system at the battery with a multimeter to make sure it operating properly.

My guess is a bad cell in the battery and the clutch was drawing too much voltage and the fuel cut-off solenoid was shutting off the fuel flow to the main jet.
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Old 11-19-2007, 05:34 PM
Fubba Fubba is online now
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Quote:
Originally Posted by Restrorob View Post
First thing you need to do is install a new battery, After all it is 2 yrs. old ?

Once you get a new battery installed check your charging system at the battery with a multimeter to make sure it operating properly.

My guess is a bad cell in the battery and the clutch was drawing too much voltage and the fuel cut-off solenoid was shutting off the fuel flow to the main jet.
Hmm...didn't know it would do that. I will definitely get a new battery. Could you explain how to check the charging system? I have a multimeter.
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Old 11-19-2007, 05:40 PM
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Restrorob Restrorob is offline
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Set your meter on DC voltage and put the red test lead on the positive battery post black on negative. Start the engine then give it full throttle, It should read between 13.5 to 14.8 if properly working.
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Old 11-19-2007, 05:43 PM
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Bill Kapaun Bill Kapaun is offline
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Not one to disagree with Rob very often, but I kind of see a possibly different scenario-
IF the alternator was failing to charge last Friday, the battery may have had enough capacity to get you through the day, but was dead the following Mon. (today)
What I would do, is charge the battery for a couple hours and then test the Voltage with the mower running full speed. It should be up around 14+ or so.
That should let you know if the charging system is working. If it is, pay attention to Rob!

A 2 year old battery IS on the suspect list.
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  #6  
Old 11-19-2007, 05:55 PM
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Grouch Grouch is offline
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Check your seat switch. If the unit thinks no one's home, it will shut down when the PTO is engaged.
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  #7  
Old 11-20-2007, 12:56 PM
Fubba Fubba is online now
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I put the new battery in. Hooked the multimeter up to it and got in the range of 13.6-14.2 everytime. Looks like the 2 year old battery was the culprit. Thanks for the help!
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Old 11-20-2007, 05:53 PM
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Restrorob Restrorob is offline
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Good to hear that's ALL it was......
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"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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  #9  
Old 11-20-2007, 09:01 PM
thelawnboss thelawnboss is offline
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you may not believe this but it may be simple, as i have had this same problem on mine. What i found was this, sometimes when i start the mower, the key will actually stick in the "START" position, when this happens, you start the blades or take off the parking brake the mower dies. I dont know that this is your problem or not but something to look for. Never know. Good luck.
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  #10  
Old 11-21-2007, 09:02 PM
Adam's Lawn and Garden Adam's Lawn and Garden is offline
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I had something similar to this happening to mine a while back, the mower shop said it was a tilt switch that they don't use on mowers anymore for this reason. He by passed it, hasn't shut off like that once.

Adam
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