The mower was working and the pto switch was engaged but the blades quit turning.
SOURCE: John Deere 160 riding mower. When I try to engage
CK THE SEAT SWICH OR THE BRAKE SWICH ONE OFEM IS BAD
SOURCE: The mower blades on my John Deere stx 38 lawn
it sounds like the safety switch under seat is bad
SOURCE: problem with John Deere L120 tractor
Park brake switch is the most likely culprit,any other would cause the tractor to not turn over in the crank position.
SOURCE: mower dies when pto is engaged blades move freely
Could be the seat switch. Your operator present switch only comes into play when the clutch is engaged. If the drive clutch is engaged, and the pto is engaged, the operator present switch has to be moade.
SOURCE: I have a John Deere L-130 and the electric PTO
Good diagnostic work, uncleparroth! By removing power to the PTO, you've proven that the PTO clutch has stuck/frozen mechanically. If you are mechanically inclined, you can remove the PTO clutch assembly and disassemble it. You could luck out, find something as simple as a broken spring and save a lot of money. Nothing to lose but your time. On the other hand it might not be repairable and you'll have to 'spring' (sorry for the pun) for a new PTO clutch which will cost about $200. Good luck!
Hi,
The safety switch beneath the seat is only one part of the several interconnecting safety features of the modern riding mower. If the system works properly, you must be seated for the mower deck to operate. The tractor will continue running with the Power Take Off disengaged if the parking brake is set before the operator leaves the seat.The seat switch consists of two electrical contacts normally separated by an air gap. A spring creates an open space between the two contacts. Mounted between two plates, the switch's spring compresses under the weight of the person sitting in the operator seat and completes an electrical circuit. With the switch closed the tractor's ignition system can be switched on with the ignition key. If the operator stands, the spring forces the gap open and interrupts the electrical ignition circuit. The safety circuit allows the riding mower motor to continue running if the PTO is not engaged. When the parking brake is set a second switch in electrical parallel with the OPS closes. This bypasses the safety switch under the seat. If the operator stands, the parking brake switch still completes the ignition circuit.The mower blade turns only when the PTO engages. If the operator should leave the seat with the blade turning and under power, injuries could result. The mower blade would even continue spinning at full power if the machine overturned. To prevent this type of accident, engaging the PTO deactivates a connection in the original circuit and completes a second circuit in series with the OPS switch.
If the operator leaves the seat with the PTO engaged, the ignition interrupts and the machine stops. Until the PTO is off, no combination of settings will restart the mower.
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