Re: Great Dane excavating co.
Quote:
Originally Posted by Lil Giants
Apparently the purpose of the 4th valve is to redirect oil straight to the tank if no other valve movement happens. It keeps the oil from travelling thru the prv causing the pump motor to strain unnecessarily - conserves battery amperage.
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Wish I would have refreshed before I just posted that!! 
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Always wasting money, as the wife says.
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