i borrowed a neighbours rotary mower to use on my l2250 and when i went to use is i couldnt get the pto engaged. i pressed the clutch and had everything in neutral and was just getting grinding noises when i tries to engage in either 540 or 1000 pto setting. if i shut the tractor off and engage the pto in 540 and start everything the pto will start but i cant disengage while running. any idea what might be wrong and what i can do to repair? also i gotta get the paddocks cut. will it harm the internals of the transmission or the motor if i engage the pto when off and then start the tractor? thank you in advance