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CAT Pump 66DX40GG1 Bare Pump 4 GPM @ 4000 PSI

Cat pump 66PPX40GG1 pressure washer pump 4000 PSI @ 4.0 GPM is a bare pump with no plumbing. You can use your old plumbing parts to save money. We highly recommend using a new unloader when installing a new pump. The VRT3-310EZ unloader valve is a great match up to this pump.

PLEASE NOTE: NO oil is shipped with this pump – Order Separately !


  • Triplex plunger design provides a smooth liquid flow.
  • Special concentric, high-density, polished, solid ceramic plungers provide a true wear surface and extended seal life.
  • Compact flange mount permits easy, direct mounting to most gas engines.
  Maximum Volume


  Max. Discharge Pressure

4000 PSI

  Maximum Pump Speed

3400 RPM

  Maximum Inlet Pressure

75 PSI

  Plunger Bore

.511 in. / 14 mm

  Plunger Stroke

.511 in. / 14 mm

  Crankcase Oil Capacity

8 oz.

  Maximum Fluid Temperature
  Inlet Port Thread

1/2″- 14 BSPP-F

  Discharge Port Thread

3/8″- 19 BSPP-F

  Shaft Diameter

1.0 in. / 25.4 mm


26.15 lbs.


11.73” x 10.51” x 8.15″



All pumps require both a primary pressure regulating device (i.e. regulator, unloader) and a secondary pressure safety relief device (i.e. pop-off valve, safety valve). Failure to install such relief devices could result in personal injury and/or damage to the pump and/or to the system components. We do not assume any liability or responsibility for the operation of a customers high pressure system.

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