I"m not sure if the 550 has it, but the 555 has a solenoid valve run by a foot switch or a buttom on the end of the loader control stick to put the transmission in neutral when dumping the bucket. You might want to disconnect the wire to it and/or make sure the spool is free. We hit a rock with ours once and bent the solenoid enough that it went into neutral on its own.
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