Murray Riding Mower-Engine Cutoff When Clutch Released

kenh99September 6, 2010

Hi All, Sure hope ya'll can help!

Have a Murray Select Riding Mower, model # 40507x8A, 12.5 hp B&S. Purchased it new in 2002 (I think).

Primary problem: Engine cuts off when clutch/brake is released.

Background: Not long ago the seat safety switch broke so I eliminated the switch and connected the 2 yellow wires from the switch together to complete the circuit. Everything worked fine. Yes, I know it defeats a safety feature but I'm a safety conscious guy so...

Now, a week later, the engine started cuting off when the clutch/brake is released after starting.

I've checked the ground wire for that seat safety circuit (under seat area), cleaned it and reattached. Still no go. The 2 wires from the former safety switch/button are well connected, clean and taped securely.

Any suggestions for toubleshooting or repair are sincerely appreciated!!

Thank You!


Thank you for reporting this comment. Undo

Connecting those 2 wires together the mower should have
not started at all, so you need to take out, disconnect
those wires altogether, your problem should be in that area.


    Bookmark   September 6, 2010 at 4:16PM
Thank you for reporting this comment. Undo

Thanks Fish,

I assumed that the safety switch completed the circuit when the plunger is depressed by sitting on the seat. Was I wrong and when depressed it opens the circuit?


    Bookmark   September 6, 2010 at 7:54PM
Thank you for reporting this comment. Undo

Seat switch is open when seat is occupied.
Seat switch closes when seat is vacant.
Closing the seat switch connects the magneto kill wire to ground, stopping the spark production and causing the engine to quit running.
The clutch switch is part of the interlock circuit and WILL permit the engine to run with the seat empty provided the clutch/brake pedal is down.
But since you connected the seat switch wires together, the clutch switch is the last switch to close and now it acts as though the seat is empty, even when the seat is actually occupied.

    Bookmark   September 7, 2010 at 12:46AM
Thank you for reporting this comment. Undo

Thank You Mownie for that explanation!!

Will disconnect the wires tonight when I get home and give it a try.

Take Care,


    Bookmark   September 7, 2010 at 9:41AM
Thank you for reporting this comment. Undo


I wish I had said it....

    Bookmark   September 7, 2010 at 10:05PM
Sign Up to comment
More Discussions
Which model Deere for my yard?
My yard is one giant hill. 1.2 acres. I have about...
John Deere 245 Won't Start (Kawasaki 14hp)
I have a ~15 year old John Deere 245 with a Kawasaki...
PTO problem.
I have a John Deere 190C with 54 in. cut i am having...
John Deere 425 pto not working
I bought this tractor used,the pto worked when I bought...
Hydrostatic Drive Problems??
Craftsman 20.5 HP Kohler Command V twin Under the seat...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™