Just a quick question.

Hi,
Did not find a manual, but a parts breakdown is at:
Murray rm Parts Diagram Index for 30550C (http://www.partsandservice.com/html/Murray/rm/rm30550c.html)
Murray breakdowns are too obtuse to always figure out where the guides are at.
At any rate you can bet you will have to lock the park brake to remove tension.
Peace,
Clarke