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Message: <blockquote data-quote="digsalot" data-source="post: 88942" data-attributes="member: 2789"><p>getting older sucks. never saw the snap rings that retain the plunger. bobcat manual says to remove them. pump manufacture says replace. Parts Manual Axial Piston Pumps, Series 40 MMF035D and MMV035D 520L0601 • Rev BA • Nov 2013 71 Series 40: M25, M35, M44 pumps, and tandem pumps Redesign the retention method in check valve assemblies As a product improvement, Danfoss changed the retention method in the check valve assembly, and SCR valve assembly. The old design allowed the check valve and SCR valve assembly to be disassembled. That retention method had the potential to hang up the valves on the retaining ring. The new design uses a different style. The retaining ring will not hang up on the valve; however, it does not allow the assembly to be taken apart. All new repairs, conversions, or purchases of a check valve or SCR valve require the entire assembly be exchanged. The new and old assemblies are totally interchangeable. The special plug part number 4350182, and the internal retaining ring part number 4350183, are obsolete. They are no longer available as service parts. All Series 40: M25, M35, and M44 single and tandem pumps This change became effective at serial number 96-40-xxxxx.</p></blockquote><p></p>