GT 225 PTO Issue

[JDGREEN4ME]

Having a problem with the mower shutting off while mowing replaced the PTO switch but the issue remains. What should I look for next?

 

[Richard001]

Having a problem with the mower shutting off while mowing replaced the PTO switch but the issue remains. What should I look for next?

Could be that the alternator is not keeping the battery charged and the lower voltage from the battery to the PTO clutch allows it to drop out.

I suggest that check the charging system and also check the air gap in the clutch.

Richard

 

[JDGREEN4ME]

I guess I should clarify...the mower keeps running but the blades shut off

 

[mark1]

On several JD mowers.345,LX255,GT225,GX325,X475,X585 The ignition control module (key switch) controls when power goes to the Deck PTO.When seat switch is on,not going in reverse etc.then it tells a relay on the circuit board to turn on and send power to the PTO.My old 345 would all of a sudden cut off the PTO because of the relay, sometimes you could just turn Pto back on, sometimes it would not .Instead of replacing the almost 200 dollar key switch unit.I bypassed the board and wired it to the headlight switch (pulled wire for lights off switch). Now it is easier to mow with as it does not shut off when I back up.or get off the seat.(yes I know safety problem). and it no longer turns itself off by itself. But it will turn off when turning off the mower with the key. As the lights would only work when key was on.

 

[beenthere]

Clever fix to several problems. :thumbsup: :thumbsup:

 

[tomplum]

I guess I should clarify...the mower keeps running but the blades shut off

Richard's info is a great place to start. I can't tell you how many people I've seen jump start their tractor and the PTO clutch drops out because the thing can't hold 10 volts. Has nothing to do with it continuing to run or not. I dunno if that clutch is adjustable or not. Jump in either a voltmeter or a light to at least see if you have power to clutch when it drops out. Worn clutches can do that. Something like a loose reverse switch wire maybe?

 

[swines]

I have a GT275 and had a problem with the PTO spontaneously shutting off. With my tractor, I could mow for about 20 minutes and then the clutch would shut off. I went through the PTO clutch, PTO switch, PTO interlock switches on the brake pedal and below the seat, and then started checking the charging system and finally found a faulty voltage regulator. Check the charge voltage to the battery with the motor running at about 1/2 throttle. You should have close to 14 volts. If you don't I would look at the voltage regulator. In my tractor, the regulator was buried in the central column. I had to take off the steering wheel, pull the center column shroud back, undo an electronics board to get to the regulator. However, once there it became quite clear. With the motor running, I had 14+ volts to the regulator, and only 11.5 volts coming out of it.

With only 11.5 volts to the battery, the charge system could not provide enough current flow to keep the battery charged as the PTO clutch requires a substantial amperage flow to stay engaged. The faulty regulator also prevented the battery from being fully charged and the problem got progressively worse over time as the battery was being discharged and never fully charged.

I replaced the voltage regulator and the PTO has worked fine for the past five years.