Hydraulic Pump Develops Low Or No Pressure. Pump Makes Screeching Noise.

  • Check electric motor rotation. Both motor and hydraulic pump must rotate counterclockwise when viewed from the shaft end. If rotation is incorrect, reverse leads L1 and L2. See Connect Power, in manual.
  • Check dipstick to ensure that hydraulic reservoir is properly filled. See Preventative Maintenance Schedule, in manual.
  • Check that inlet fitting is fully tight to ensure no air is leaking into the pump inlet.
  • To prime pump, run unit at lowest pressure setting and slowly increase pressure. In some cases, it may be necessary to remove motor cover and drive belt to allow for manual (counterclockwise) rotation of hydraulic pump. Turn fan pulley by hand. Verify oil flow by removing oil filter to see flow into filter manifold. Reinstall oil filter. Do not operate until without a properly installed oil filter.

 

  • If noise continues longer than 30 seconds, shut off motor by turning the motor power switch (c36) to OFF position. Check that the inlet fittings are tight and that the pump has not lost its prime.
  • Ensure that the reservoir is properly serviced. 
  • Improve ventilation to allow more efficient heat dissipation.
  • Motor must operate counterclockwise from pulley end.
  • Verify motor is wired properly according to schematic found inside motor junction box.
  • Check drive belt condition. 
  • Replace if broken.