Posted by Bob Roese on June 03, 2008 at 12:54:54 from (208.13.106.7):
1969 4020 diesel. Chatter noise from the hydraulic couplers when the hydraulics are idle. Noise lessens immensely when 3 pt arms are lifted. I have had the tractor to the dealer and we have replaced the pump drive couplers (don't remember if the pump drive shaft was replaced), rebuilt hyd pump and steering valve, replaced priority valve, changed filters and screen, rebuilt the brakes, and checked the pressure at the SVC. I'm out of ideas as everything works fine but the noise is driving me crazy (short drive). Thanks for listening.
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