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Have 1978 Yanmar 330D, 1500 hours. stick bucket in to gravel pile and bucket slow to lift, like just not enough pressure. Rpms 2,000, thinking that should be enough. The hyd/trans screen filter cleaned and fluid changed with 32 weight hyd fluid. There is no adjustment on the control module. John Deere guy says HyGuard which is 20 weight, the 32 weight you put in is too thick.
I realize I may be asking/answering my question but strugging to get if fixed.
larry