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Recent content by MarvinKent

  1. M

    Kobota KX080-3t Bogging down under small loads.

    It sounds more like a hydraulic control issue than a pump failure since it still makes full pressure and destrokes correctly. The whining and jerky movement could be caused by cavitation, a sticking servo valve, blocked suction strainer, or incorrect pilot pressure. Since the travel speed works...
  2. M

    Mini Hyd Excavator 302.4D, fuel gets into the oil

    Hi, this issue is usually caused by a leaking injector or a faulty injection pump seal on Yanmar engines. Fuel can drip into the cylinder and pass the piston rings into the oil, or leak directly from the pump into the crankcase. I’d check the injectors first, then inspect the injection pump...
  3. M

    opening travel motor gearcase lube ports

    Final drive drain and check plugs are often extremely tight, especially if they have never been removed since the machine was new. Using a high quality, tight fitting Allen socket and tapping it in firmly with a hammer can help prevent stripping. Heating the housing around the plug (not just the...
  4. M

    John Deere 50G Excavator case drain PIN 1FF050GXJNH297017

    You can usually add a case drain without too much trouble, but it depends on how your 50G is plumbed. Most people tee a low pressure return line directly into the hydraulic tank or an existing return to tank port, making sure there is no back pressure. Do not run the case drain through the...
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