Inside of the front of the pump are 6 pistons, 6 springs, and 12 check valve balls and springs. Maybe something is going on in there. Not too hard to pull the pump and then the head off the pump. There is a pump rebuild kit available that gives you the springs and balls. Might be worth a try. Not too expensive. If I went in there I would put in new check valve springs and balls regardless of what I found.
I can send you the piston pump supplement manual if you want. Its for the very very early pump with ball bearings, yours probably has roller bearings, but the head end of the pump is the same. Just ask and I'll send it.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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