Anybody experience this on a 46A29585 vintage Cat? When my D8H gets warm, (30-45 min of run time), the hydraulics slow down, and the pump starts making groaning noises. Changed the filter in the tank, replaced the hyd oil with Tractor Hyd 303; problem persists. The hyd oil tank gets very hot, after running for 30-45 min. Not sure how or where hyd oil cooler is, but engine water runs nice and cool; hard to make her go above 140 degrees.
Cat D8H hyd pump whining, no power
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