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Product / / 85.139.062B

General Pump HTXS1812S Pump Assembly – 3.8 GPM, 2,000 PSI, 24 mm Shaft

General Pump HTXS1812S Pump Assembly – 3.8 GPM, 2,000 PSI, 24 mm Shaft

Specifications

UNLOADER

External 85.300.037

WARRANTY

5 Years

RPM

1,750

PUMP MODEL

GP HTXS1812S

PUMP TYPE

Triplex

Oil Type

30W Non Detergent

Oil Capacity

14 oz

Thermal Relief Value

85.300.023

Max Inlet Temperature

93°C / 200°F

Manifold Type

Nickel Plated Brass

Soap Injector

Adjustable 85.400.000

Discharge Size

3/8" Brass QC 85.300.108

Inlet Size

3/4" GHF

Plunger Piston

Ceramic

Unloader Type

External 85.300.037

Max GPM

3.8

Shaft Size

24 mm

Direct Drive

Gas / Electric

Weight

18 lbs

Belt Drive

Gas / Electric

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PRODUCT

DESCRIPTION

High-Performance Belt Drive Triplex Pump

The General Pump HTXS1812S Pump Assembly (Bare Pump Part #85.130.062) is a triplex belt-drive pump that’s built for maximum performance and durability for professional cleaning. 3.8 GPM and 2,000 PSI means it can handle medium to heavy duty cleaning with ease.

Trusted by pros worldwide, General Pump (GP) makes pumps that can withstand the toughest work environments. The HTXS1812S has a nickel-plated brass manifold, ceramic plungers and an external unloader for long life, heat resistance and consistent output. Backed by a 5 year warranty this pump will give you years of service in commercial and industrial applications.

Features

  • Bare Pump Part #: 85.130.062

  • Manufacturer: General Pump (GP)

  • Model: HTXS1812S

  • Pump Style: Triplex, belt drive

  • Drive Type: Gas/Electric compatible

  • Max Pressure: 2,000 PSI

  • Max Flow Rate: 3.8 GPM

  • Shaft Size: 24 mm

  • Unloader Type: External (85.300.037)

  • Plunger (Piston): Ceramic

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

  • Discharge Size: 3/8" Brass QC (85.300.108)

  • Soap Injector: Adjustable (85.400.000)

  • Manifold Type: Nickel-plated brass

  • RPM: 1,750

  • Max Inlet Temp: 93°C / 200°F

  • Thermal Relief Valve: 85.300.023

  • Oil Capacity: 14 oz

  • Oil Type: 30W non-detergent

  • Weight: 18 lbs

  • Warranty: 5 Years

Built for Pros

The triplex plunger design of the HTXS1812S means smooth operation, reduced vibration and longer component life compared to axial pumps. With ceramic plungers it can withstand heat and wear even in continuous use applications.

2,000 PSI and 3.8 GPM makes this pump ideal for medium duty industrial cleaning, commercial washing and agricultural maintenance where water volume and pressure is key.

Tough and Durable

The HTXS1812S is built with premium materials for maximum durability and life:

  • Nickel-plated brass manifold resists corrosion and improves heat dissipation.

  • Ceramic plungers handle high heat and friction for long life.

  • 24 mm shaft allows secure integration into a wide range of belt driven systems.

  • 18 lbs of robust construction provides a balance of strength and easy installation.

This will give you long term reliability in tough environments like workshops, farms and industrial facilities.

Operator Friendly Features

General Pump designed the HTXS1812S with features that make life easier for operators:

  • External unloader (85.300.037): Gives you precise control over pressure and makes service easy.

  • Adjustable soap injector (85.400.000): Allows chemical or detergent application for better cleaning.

  • Thermal relief valve (85.300.023): Protects the pump from damage when in bypass mode.

  • Quick-connect brass discharge (3/8” – 85.300.108): Secure and reliable hose connections.

Low RPM Advantage

Running at 1,750 RPM this pump has lower heat buildup, less wear on internal components and quieter operation than higher speed pumps. Lower RPM means longer life and makes it perfect for continuous or frequent use in commercial applications.

Plus its 200°F (93°C) inlet temperature rating means you can use it in applications where warm water is required, expanding its use even further.

Easy Maintenance

The HTXS1812S is designed to be serviceable to reduce downtime and maximize performance:

  • Uses 14 oz of 30W non-detergent oil for smooth operation.

  • Oil checks and changes are simple and inexpensive.

  • Includes a thermal relief valve to automatically protect against overheating.These features make this pump perfect for operators who want professional reliability with minimal hassle.

Applications

The General Pump HTXS1812S is versatile and suitable for many cleaning jobs:

  • Industrial Cleaning – Degrease machinery, shop floors and equipment.

  • Agricultural Applications – Wash tractors, harvesters and other farm equipment.

  • Fleet Maintenance – Clean trucks, buses, trailers and service vehicles.

  • Commercial Property Cleaning – Sidewalks, parking lots, siding and building exteriors.

  • Car Wash Systems – Belt driven setups requiring consistent performance.

  • Food Processing & Warm Water Applications – Handles higher inlet water temperatures up to 200°F (93°C).

It’s versatile enough for everyday cleaning and durable enough for industrial use.

Product Details

  • Part #: 85.130.062

  • Manufacturer: General Pump (GP)

  • Model: HTXS1812S

  • Style: Triplex, belt drive

  • Drive Type: Gas/Electric compatible

  • Max Pressure: 2,000 PSI

  • Max Flow Rate: 3.8 GPM

  • Shaft Size: 24 mm

  • RPM: 1,750

  • Unloader: External (85.300.037)

  • Soap Injector: Adjustable (85.400.000)

  • Manifold Material: Nickel-plated brass

  • Plunger Material: Ceramic

  • Inlet Connection: 3/4” GHF

  • Discharge Connection: Brass QC 3/8" (85.300.108)

  • Oil Capacity: 14 oz (30W non-detergent oil)

  • Thermal Relief Valve: 85.300.023

  • Max Inlet Temp: 93°C / 200°F

  • Weight: 18 lbs

  • Warranty: 5 Years

General Pump Reliability

General Pump (GP) is a global leader in high pressure pumps. The HTXS1812S Pump Assembly is a reflection of that, combining triplex plunger technology, nickel-plated brass components and operator friendly features for long life. 5 Years warranty and backed by history. For tough, reliable and long lasting cleaning.

Compare Pressure Washer

LEARN MORE
LEARN MORE
PUMP MODEL
GP HTXS1812S - -
PUMP TYPE
Triplex - -
UNLOADER
External 85.300.037 - -
WARRANTY
5 Years - -
RPM
1,750 - -

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: