CAT 67DX39G1IAB Pressure Washer Pump – 3.9 GPM, 4,400 PSI, 1" Shaft

Part Number: 85.119.031B
Bare Pump Part #: 85.110.031
Pump Model: CAT 67DX39G1I
Pump Type: Triplex | Direct Drive | Gas

High-Pressure Direct-Drive Triplex Pump with Built-In Unloader

The CAT 67DX39G1IAB Pump Assembly is a professional-grade triplex direct-drive gas pressure washer pump engineered for operators who demand maximum pressure, compact design, and proven reliability. Delivering 4,400 PSI at 3.9 GPM, this pump provides exceptional cutting power while maintaining efficient water flow for demanding cleaning applications.

Manufactured by CAT Pumps, a global leader in high-pressure pump technology, the 67DX39G1IAB features a brass manifold, ceramic plungers, and a built-in unloader for simplified installation and dependable operation. Backed by a 5-year warranty, this pump is designed for professional use in commercial, industrial, and heavy-duty residential systems.

Key Features

• Maximum Pressure Output
  4,400 PSI delivers aggressive cutting power for tough grime and buildup

• Efficient Flow Rate
  3.9 GPM balances pressure and coverage for fast, effective cleaning

• Triplex Ceramic Plungers
  Smooth operation with superior heat and abrasion resistance

• Built-In Unloader
  Integrated pressure regulation for compact design and simplified setup

• Direct-Drive Configuration
  Ideal for gas engines operating at 3,450 RPM

• Brass Manifold Construction
  Corrosion resistant with excellent heat dissipation

• Compact, Lightweight Design
  Only 17 lbs for easy installation and serviceability

Specifications

Triplex Performance Advantage

The triplex plunger design is the professional standard for high-pressure applications. Using three ceramic plungers, the 67DX39G1IAB reduces vibration, improves efficiency, and significantly extends seal and component life compared to axial-cam pumps.

With 4,400 PSI, this pump delivers exceptional cutting force for stripping, degreasing, and surface preparation, while 3.9 GPM provides enough water volume for efficient rinsing and coverage.

Built for Durability

Every major component of the 67DX39G1IAB is engineered for long service life:

• Ceramic plungers resist heat, wear, and abrasion

• Brass manifold protects seals and internal components from corrosion

• 1” horizontal shaft ensures compatibility with most professional gas engines

• 17-lb compact build balances ruggedness with ease of installation

This makes the pump ideal for portable and cart-mounted pressure washer systems.

Integrated Protection & Convenience

Designed for efficiency and reliability in the field:

• Built-in unloader simplifies plumbing and reduces external components

• Fixed soap injector allows detergent application with low-pressure nozzles

• Brass quick-connect discharge ensures secure, leak-free hose attachment

• Thermal relief valve (85.300.024) protects the pump during bypass operation

These features reduce setup time while protecting the pump from heat damage.

Maintenance & Service

Routine maintenance keeps the pump performing at its best:

• Uses 13.5 oz of 30W non-detergent oil

• Simple oil checks and scheduled oil changes

• Rated for inlet water temperatures up to 140°F (60°C)

With proper maintenance, the 67DX39G1IAB delivers years of reliable service.

Common Applications

• Construction Cleaning: Tools, equipment, and job-site washdown

• Fleet Maintenance: Trucks, trailers, buses, and service vehicles

• Agriculture: Tractors, harvesters, and farm equipment

• Industrial Cleaning: Degreasing machinery and workspaces

• Property Maintenance: Concrete, siding, decks, and exterior surfaces

• Surface Preparation: Paint, coating, and buildup removal