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Message: <blockquote data-quote="Kilroy2k1" data-source="post: 61200" data-attributes="member: 2002">Thanks for the reply,  Yes I did try it while moving, made no difference. I'm sure there is a little bit of air in the system but it should still build up to pressure once its compressed. I gave it a very good cleaning and greasing before final assembly so its well lubricated.From the research I've been doing there are a couple possibilities I can come up with. There is a max pressure relief valve in the speed control assembly that may be leaking or blocked open and bypassing, or the pressure coming off the lift/aux valve is bypassing internally before getting to the var sleed valve.I'm  behind the 8 ball on my 620 restoration and this 600 just seems too good to scrap for just a few parts so while the 620 is in pieces I'd like to use the 600 to clear the driveway for the winter. I just need to sort these couple of minor issues and I'm set for winter. once the other machine is done then I just might restore the 600 as well.Thanks and hope your installation goes well <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />Tom.</blockquote>