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Product / Pressure Washers / 85.119.031B

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

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

Specifications

UNLOADER

Built-In

WARRANTY

5 Years

RPM

3,450

PUMP MODEL

CAT 67DX39G1I

PUMP TYPE

Triplex

Oil Type

30W Non Detergent

Oil Capacity

13.5 oz

Thermal Relief Value

85.300.024

Max Inlet Temperature

60°C / 140°F

Manifold Type

Brass

Soap Injector

Fixed

Discharge Size

3/8" Brass QC 85.300.103

Inlet Size

3/4" GHF

Plunger Piston

Ceramic

Unloader Type

Built-In

Max GPM

3.9

Shaft Size

1"

Direct Drive

Gas

Weight

17 lbs

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PRODUCT

DESCRIPTION

Professional Triplex Pump for Extreme Cleaning Power

The CAT 67DX39G1IAB Pump Assembly (Bare Pump Part #85.110.031) is a high-performance triplex direct-drive gas pump for professionals who need maximum power, efficiency and long lasting reliability. With up to 4,400 PSI at 3.9 GPM this pump is perfect for industrial, commercial and demanding residential cleaning applications.

Built by CAT Pumps, a global leader in durability and precision engineering, the 67DX39G1IAB has a brass manifold, ceramic plungers and built-in unloader in a rugged design that performs consistently under pressure. Backed by a 5 year warranty it has the professional grade dependability CAT is known for worldwide.

Features

  • Bare Pump Part #: 85.110.031

  • Pump Manufacturer: CAT Pumps

  • Pump Model: 67DX39G1

  • Pump Style: Triplex, direct-drive gas

  • Max PSI: 4,400

  • Max GPM: 3.9

  • Shaft Size: 1" horizontal shaft

  • Unloader Type: Built-in

  • Plunger (Piston): Ceramic for maximum heat resistance

  • Inlet Size: 3/4" GHF (garden hose fitting)

  • Discharge Size: 3/8" Brass QC (85.300.103)

  • Soap Injector: Fixed

  • Manifold Type: Brass

  • RPM: 3,450

  • Max Inlet Temp: 60°C / 140°F

  • Thermal Relief Valve: 85.300.024 included

  • Oil Capacity: 13.5 oz

  • Oil Type: 30W non-detergent oil

  • Weight: 17 lbs

  • Warranty: 5 Years

Built for Maximum Performance

The triplex plunger design is the professional standard for high-performance pumps. With three ceramic plungers the 67DX39G1IAB reduces vibration, smooths out operation and increases efficiency compared to axial pumps.Delivers 4,400 PSI of pressure and 3.9 GPM of water flow. The best of both worlds: cutting power for tough grime and plenty of water for fast coverage. Perfect for heavy-duty jobs like construction cleaning, industrial equipment maintenance and fleet washing.

Durable

Every part of the 67DX39G1IAB is built to last:

  • Ceramic plungers for maximum heat and abrasion resistance, longer service intervals and longer pump life.

  • Brass manifold for corrosion resistance and heat dissipation, protects internal components.

  • 1” horizontal shaft for compatibility with most professional grade gas engines.

Weighs 17 lbs so it’s rugged but manageable for installation and maintenance.

Integrated Protection and Convenience

Engineered for operator convenience and system protection:

  • Built-in unloader regulates system pressure and protects against overpressurization.

  • Fixed soap injector for easy detergent application with a low-pressure nozzle.

  • Brass quick-connect discharge (3/8”) for a leak-free hose connection.

  • Thermal relief valve (85.300.024) prevents damage during extended bypass cycles by releasing overheated water and refreshing it with cooler water.

Maintenance

Easy maintenance schedule to maximize pump life with minimal downtime:

  • 13.5 oz of 30W non-detergent oil for lubrication.

  • Regular oil checks and scheduled oil changes for peak performance.

  • Inlet water temperature up to 140°F (60°C) for flexibility in various operating environments.

These simple maintenance tasks will extend service life and performance.

Applications

The power and reliability of the CAT 67DX39G1IAB Pump Assembly makes it suitable for many demanding cleaning applications:

  • Construction Sites – Remove mud, concrete dust and grease from tools and heavy equipment.

  • Fleet Maintenance – Wash large vehicles like trucks, trailers and buses.

  • Agriculture – Clean tractors, harvesters and other farm machinery.

  • Industrial Cleaning – Clean grease, oil and grime on large equipment and workspaces.* Property Maintenance – Remove mold, mildew and stains from decks, siding and concrete surfaces.

  • Surface Preparation – Strip paint, coatings and buildup before refinishing or repainting.

It’s high PSI and flow rate makes it suitable for both precision cleaning and broad coverage tasks.

Product Details

  • Part #: 85.110.031

  • Manufacturer: CAT Pumps

  • Model: 67DX39G1

  • Style: Triplex, direct-drive gas

  • Max Pressure: 4,400 PSI

  • Max Flow Rate: 3.9 GPM

  • Shaft Size: 1” horizontal shaft

  • RPM: 3,450

  • Unloader: Built-in

  • Soap Injector: Fixed

  • Manifold Material: Brass

  • Plunger Material: Ceramic

  • Inlet Connection: 3/4” GHF

  • Discharge Connection: Brass QC 3/8" (85.300.103)

  • Oil Capacity: 13.5 oz (30W non-detergent oil)

  • Thermal Relief Valve: 85.300.024

  • Max Inlet Temp: 60°C / 140°F

  • Weight: 17 lbs

  • Warranty: 5 Years

CAT Pumps Quality

CAT Pumps are known worldwide for their reliability and innovation in pressure washer pump technology. The 67DX39G1IAB Pump Assembly continues this tradition with triplex design, brass manifold, ceramic plungers and built-in unloader in a pump built for extreme performance.

With a 5 year warranty you get peace of mind, professional reliability and a proven return on investment.

When your job requires maximum pressure, long-term durability and professional grade performance trust the CAT 67DX39G1IAB Pump Assembly – engineered for results, built to last.

Frequently Asked Questions about Pressure Washers

How to store a pressure washer?

To ensure the durability of your heavy duty pressure washer:

  • Empty the gas tank to prevent fuel from degrading or clogging the engine.
  • Empty the pump and hoses of any remaining water.
  • Perform necessary maintenance before storage.
  • Store in a dry area.
  • Cover.

What is a pressure washer?

A power washer is a cleaning machine that uses a gasoline engine to power a high pressure water pump and nozzle. It’s used to clean driveways, decks, vehicles, outdoor furniture and more by spraying water at high PSI to remove dirt, grime, mold and other debris.Many models also come with a detergent tank for added cleaning power.

How does a power washer work?

A power washer works by drawing water from a connected hose and pumping it through a high pressure nozzle. The gas engine powers the pump which pressurizes the water and then expels it through the nozzle at high speed to clean the surface. The water pressure is measured in PSI (pounds per square inch) and the flow rate is measured in GPM (gallons per minute).Many models also feature adjustable water pressure settings to cater to different cleaning needs. BE makes pressure washing easy with models available for light jobs and heavy duty commercial cleaning projects.

Gas vs Electric power washers?

The main difference is that a gas pressure washer, known for its cleaning power, is powered by a gasoline engine, making it more powerful and portable, while an electric pressure washer is powered by electricity and is generally quieter and lighter.

Gas pressure washers are for heavy duty and large areas due to their durability, whereas electric pressure washers are for smaller jobs.

Your BE electric pressure washer is perfect for smaller jobs and built for portability, and we offer a wide range of electric models. Included with our electric models is a long extension cord for use anywhere around your house.

What to consider?

When choosing a gas pressure washer consider:

  • Pressure (PSI): More PSI means more cleaning power but also more potential for damaging delicate surfaces.
  • Flow Rate (GPM): More GPM means faster cleaning as more water is dispensed.
  • Engine Power: Bigger engines mean more durability and power.
  • Portability: Weight, handle design and wheel size for easier to move.
  • Nozzles: Multiple spray nozzles to adjust the spray pattern for different tasks.
  • Adjustable Nozzle: Allows for fine-tuning the spray intensity and pattern for various cleaning needs.

How much pressure do I need for?

The required pressure (PSI) and cleaning power depend on the surface you’re cleaning:

  • Light duty (car washing, outdoor furniture): 1,300-1,800 PSI.
  • Medium duty (patios, fences, decks): 2,000-3,000 PSI.
  • Heavy duty (driveways, brick walls, large equipment): 3,000+ PSI.

Many pressure washers come with adjustable pressure settings to handle different cleaning tasks effectively.

Can a pressure washing damage surfaces?

Yes, a power washer can damage surfaces if used incorrectly. High pressure water can strip paint, dent soft surfaces or even cause structural damage if the pressure is too high or the nozzle is held too close to the surface. Always use the right PSI for the material you’re cleaning and keep a safe distance from delicate surfaces.

To prevent damage, consider using a model with adjustable pressure settings.

How to maintain your pressure washer?

To ensure the durability and smooth operation of a pressure washer:

  • Change the oil as per manufacturer’s instructions.
  • Clean or replace the air filter to ensure good airflow.
  • Inspect and clean the nozzle regularly to prevent clogs.
  • Drain the gas tank if you’re storing the washer for a long time.
  • Check the hoses for leaks or damage and replace them if needed.
  • Follow regular maintenance requirements to keep the washer in optimal condition.

Can I use a pressure washer in cold weather and low water temperature?

You can use a pressure washer in cold weather but it’s more difficult. The water flow rate in the hoses and pump can freeze and damage the equipment. If you plan to use your pressure washer in cold temperatures make sure to winterize it and store it in a warm area when not in use. You can also use anti-freeze solutions for pressure washers.

Some models are designed to use hot water, which can be particularly effective for cleaning in cold weather.

Do I need any accessories?

Common accessories for power washers: