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Engine shuts down when drive is engaged

Unplugged wire to transmission . That worked. Then engaged blades . Engine shut down. Maybe sensor. Which one?

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Posted on Jan 02, 2017

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SOURCE: 98 Ford Taurus shuts off when shifted into gear.

its in the timing ...whenever you start it it sits and idles fine but when you go to put it in gear it dies...the timing needs to be repaired. its a guaranteed solution.

Posted on Feb 13, 2009

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SOURCE: PTO switch shuts down tractor

if the pto bearing is locked up it will stop a motor dead this is a common problem. You will have to get a new clutch assemble. The other thing that it could be is the deck has a locked up spindle.

Posted on Aug 20, 2009

  • 1 Answer

SOURCE: I have a 15.5 HP Sears Craftsman 42

I'm betting that you need a new safety kill switch - probably the one underneath the seat (the spring-loaded plunger switch that won't let you use the machine without your *** in the seat). Could also be the one behind the "dash" that is associated with the blade engagement mechanism.

I know that the under-seat-switch cannot be bypassed or it will disable the machine in the exact way that you described. Why do I say this? Because I just tried to bypass my own "***-in-the-seat-safety-switch" on my very own 15.5 HP, 42" Sears tractor, and it responded by punishing me - the absense of the switch caused the motor to cut out when I tried to put the machine in gear AND/OR engage the blade. It seems to have some measured capacitance - the absense of same seeming to interrupt the ignition timing enough to shut the motor down when you attempt to get anywhere past neutral or engage the blade. These "safety" switches may be needed by a very few who prefer to be drunk while they mow lawns on steep slopes that their tractor mowers were not designed for, but I find these items to be troublesome and enfuriating. My trees shed a lot of sticks in high winds, and I can't stand shutting the machine down and restarting it EVERY SINGLE TIME I have to dismount to clear sticks or other obstructions out of my mowing path. This is an obnoxious, "nanny-design" feature that desparately needs to be discontinued. It also makes both jump-starting the tractor and electrical troubleshooting much more difficult than they should be. The tractor should let you dismount without shutting down, as long as you have disengaged the blade and shifted into neutral. It should also let you jump start with jumper cables - impossible to do with your rear end in the seat. By the way, call Manufacturer's Supply, Inc. at 1-800-826-8563. They may have a replacement - their item number 31-9664 might do it, but talk to them first. I'm calling them tomorrow. Good luck.

Posted on May 17, 2010

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SOURCE: RE: Lawn mower blades will not engage

This sounds like a faulty ground condition, the PTO clutch requires a ground provided by the chassis wiring harness to function and a ground for the ignition switch to kill fire to the coils. The other components work as they should because the voltage regulator, fuel shutoff solenoid and starting interlock system have their own grounds. The ignition switch in these mowers is a large round plastic switch not capable of grounding itself, it should have a black wire leading from the terminal marked "G" on the backside of the switch.

to diagnose a faulty ground you'll need a basic 12V test lamp:

Unplug the switch and and install a the test light clip on the positive terminal of the battery, probe the ground wire in the unplugged harness that corresponds with the "G" terminal only. If the ground is good the lamp in the test light will illuminate brightly, if poor or faulty the lamp will not light or be noticeably dim.

Further verification of a faulty ground or failed PTO switch can be tested at the PTO Clutch harness, turn the key on, engine NOT running, and pull the PTO Switch to the engage position, with the test light clipped onto the Negative Battery terminal or chassis, back probe the connected PTO clutch terminals. If the PTO switch is good and the ground is good then Only one terminal will illuminate the lamp, if both wires illuminate the lamp then the ground is faulty, if no lamp illumination then a loss of power is suspected, check the terminals on the PTO switch and Ignition switch for power.

Typical Ground termination locations are on the frame near the rear of the tractor frame, above the transmission, in the steering column area and near the solenoid, check for a loose or corroded eyelet terminal, broken wire, or a missing fastener in these areas.

Posted on Jul 04, 2010

  • 2239 Answers

SOURCE: Mower runs fine but shuts off when the blades are engaged.

This sis a micro switch issue, start by checking/replacing the seat switch, make sure the block connecter is fully pushed home onto the micro switch.

Posted on Jul 21, 2012

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1 Answer

Craftsman Model Number: 917.377151 motor shuts down when blades engaged


The engaging of the mowdeck is cause an excessive demand of your engine. From that, we can assume your problem is in the deck. Since the power drive is all about belts and it threw the belts, from your information I can only deduce that either an object (stick-wood-rock) has wedge into a position that has stopped rotation of the blades. Also, each blade has a pulley/spindle. These have bearings which must be free to rotate.
A bearing failure or seizing can also cause the problem you report.

Follow safety rules in your manual to insure the engine cannot start. Attempt to rotate each blade to check for free rotation. If the do not you most likely will need to remove the mower deck and check further. An obstruction or seized spindle should be easy to determine and sit repair is easily possible.

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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

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Why does engine die when brake released or mower engaged?


The first thing I would check is to make sure the drive belt is not binding somewhere.

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Operator presence switch cuts off engine even if blades not engaged


Hi, you must have the blades disengaged and the park brake locked on before you can get off it. Regards Phil.

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some of the switches work in series disconnect the kill switch wire from the engine and try it the work your way back to the switches

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My 48 inch riding mower shuts off when I try to engage the blade. It runs until I try to engage


mine has a reverse cut out when blades are running....maybe the switch is bad and thinks mower is in reverse therefore shutting down the mower when the blades are engaged....

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1 Answer

RE: Lawn mower blades will not engage


This sounds like a faulty ground condition, the PTO clutch requires a ground provided by the chassis wiring harness to function and a ground for the ignition switch to kill fire to the coils. The other components work as they should because the voltage regulator, fuel shutoff solenoid and starting interlock system have their own grounds. The ignition switch in these mowers is a large round plastic switch not capable of grounding itself, it should have a black wire leading from the terminal marked "G" on the backside of the switch.

to diagnose a faulty ground you'll need a basic 12V test lamp:

Unplug the switch and and install a the test light clip on the positive terminal of the battery, probe the ground wire in the unplugged harness that corresponds with the "G" terminal only. If the ground is good the lamp in the test light will illuminate brightly, if poor or faulty the lamp will not light or be noticeably dim.

Further verification of a faulty ground or failed PTO switch can be tested at the PTO Clutch harness, turn the key on, engine NOT running, and pull the PTO Switch to the engage position, with the test light clipped onto the Negative Battery terminal or chassis, back probe the connected PTO clutch terminals. If the PTO switch is good and the ground is good then Only one terminal will illuminate the lamp, if both wires illuminate the lamp then the ground is faulty, if no lamp illumination then a loss of power is suspected, check the terminals on the PTO switch and Ignition switch for power.

Typical Ground termination locations are on the frame near the rear of the tractor frame, above the transmission, in the steering column area and near the solenoid, check for a loose or corroded eyelet terminal, broken wire, or a missing fastener in these areas.

Jul 04, 2010 | Craftsman Garden

1 Answer

Engine shuts down when pedal is released, and when pto is ingaged


check your Reverse Gear engage switch and PTO (blades engaged switch), either a bad switch(es) or short in wiring indicating that you are in Reverse with the blades engaged. Is there an override function so that you can mow in reverse? Check that circuit vs. the PTO and reverse gear. good luck

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Auto trans car chokes down and engine shuts off when in gear


the torque convertor is locking up,There is a plastic wire harness on top the transmission,Unplug it from the transmission and your troubles will cease,
If you want it repaired and transmission shop can do it,or you can drive it for ever unplugged

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Car shuts off while driving, push in clutch, car back to life


that sounds like wiring or connection issue.
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