I would look for external check valve first inline . The control valve has spool inside with o rings there maybe pressure setting for the hydrologic .I have never seen your system but I know hydrologic. I would change oil , maybe try cycling it like mentioned if there was air it would shudder.
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2018 1 ton 4x4 c.c standard bed GMC Denali
Anderson ultimate hitch
2015 311 Impact Fusion toy hauler
2018 Milwaukee 8 FLRTU roadglide glide ultra
2018 800 Z force spot BUGGY.
500 watts of solar enough power for boon docking.
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