I have never seen spring length specs on these pumps. Of course all I ever did was go up to parts dept and get new ones . Could pretty well just look at them and tell if they were weak. Most all the time the check ball springs are weak. Later pumps had a little stop under the springs also so ball could not completely depress spring and block off oil out let which usually happens with cold thick oil making a loader drop part way and stop so you had to start the drop process over again. Far as putting them back together, I always did it myself, used a vise grip on the outer operating lever, locked the internal mechanism in raise position. Just takes some practice which I guess you hope you will never get. H was worse than M because it used a flimy gasket that you had to me very careful of . Also, make sure there is a gasket under the seat of the relief valve. I never liked to see much over 900 psi on the relief valve, more like 800 or you can strip the threads on the drive coupler. Lot of guys washer that relief valve which is of course is a real pain as you have to take most everything apart again to get at it . IH did show a test fixture for checking pressure without putting it back in tractor but I never saw one. Could write a couple of books on those pumps.
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Today's Featured Article - Product Review - by Staff. When we finally checked out the 3000 PSI North Star, the whole story chaned. This unit was equipped with an 11 HP Honda engine with fuel shutoff, adjustable flow and optional syphon degreaser dispenser. It didn't have a pressure release or electric start to facilitate easy starting but according to the instructions, simply pulling on the trigger while cranking was sufficient. This method of starting proved more than adequate and kept the cost down on the unit. It had all the important
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