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66DX40G1I – Cat 66DX Pressure Washer Plunger Pump 4 GPM @ 4000 PSI W/U/I

Product MSRP: $1,195.00


Available for Purchase!


66DX40G1I – Cat 66DX Pressure Washer Plunger Pump 4 GPM @ 4000 PSI W/U/I

66DX40G1I Cat 66DX Pressure Washer Plunger Pump 4 GPM @ 4000 PSI W/U/I. Direct Drive Plunger Pump. Replaces the 67DX triplex pressure washer pump and comes with Pressure Regulator only. Just mount pump, attach the plumbing, set the pressure and your ready to go !!!

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


Max. RPM: 3400 rpm
Engine Mounting Face: 6.5”
Inlet Pressure Range: Flooded to 75 psi (Flooded to 5.25 bar)
Bore: 0.551” (14 mm)
Shaft Diameter (Hollow): 1” (25.4 mm)
Max. Liquid Temperature: 140°F (60°C)
Crankcase Capacity: 8 oz. (0.55 l)
Inlet Ports (2): 1/2” NPTF (1/2” NPTF)
Discharge Ports (2): 3/8” NPTF (3/8” NPTF)
Weight: 26.15 lbs. (11.9 kg)
Dimensions (Pump Only): 11.73 x 10.51 x 8.15” (298 x 267 x 207 mm)


  • 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.
  • Modular Regulating Unloader with built-in by-pass isstandard forsafety and pressure setting.
  • Fixed Chemical Injector is standard and mounts directly onto Unloader to provide cleaning flexibility.

Pump Oil is NOT included-See below to order separately

SKU: 66DX40G1I

Additional information

Feature 5

Pump Shaft Size

1" Hollow Shaft

Feature 4

Feature 2


Feature 3

Feature 1


Feature 6

Feature 10

Pump Type

Feature 7

Feature 9

Feature 8


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Product Enquiry


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.

Repair Parts for this item:

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