JD 455 PTO problems

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I have a 2000 JD 455. When I engage the mower deck it runs fine for a few minutes and then shuts down will restart and run and shut down. Then it will not restart. Pull the switch on and off it will restart and run for 5-10 min. and shutdown. Have replaced the switch and the module to no avail. There is no heat build up at the solenoids and the seat switch works fine.