Author Topic: sundstrand 20  (Read 9492 times)


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sundstrand 20
« on: November 04, 2015, 02:27:27 PM »
hello ,i got a old roller with a sunstrand series 20 .need some light to repair .when the unit is started i got 250 psi on charge pump .then when engage on forward or reverse charge goes to 50 psi and the pump pressure to 2200 psi .gradually the main pressure keeps dropping until hits zero and charge pressure also goes to zero .though of charge pressure valves on pump?any help would be so apprecciated ,im in a small country ,belize ,no service here.