I'd guess there's air in the system since the cylinders are 2-way pressure. A pressure leak in one direction means there is suction traveling the opposite direction, and could pull in air.
Find a post by azpete and send him a PM about your problem. He is an expert on HWH hyd systems.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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