Product Overview

The Interpump W140M Pressure Washer Pump is a professional low-speed industrial triplex plunger pump designed for reliable performance in commercial and industrial cleaning applications. Part of the trusted Interpump 44 Series range, the W140M delivers up to 140 Bar operating pressure with a flow rate of 12 litres per minute at 1450RPM, making it ideal for professional pressure washers, static washdown systems, and industrial cleaning equipment.

Manufactured with a heavy-duty brass manifold, solid ceramic pistons, and precision-engineered internal components, the Interpump W140M is built for long service life, smooth operation, and dependable daily performance. Its low-speed 1450RPM operation helps reduce wear and heat build-up, making it suitable for continuous-duty applications across industrial, agricultural, workshop, and commercial vehicle cleaning environments.

The W140M is widely used throughout the pressure washing industry thanks to its reliability, easy servicing, and excellent spare parts availability.

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Key Features

• Genuine Interpump W140M industrial pressure washer pump
• Heavy-duty Interpump 44 Series triplex plunger pump
• Produces up to 140 Bar operating pressure
• 12 litres per minute flow rate
• Low-speed 1450RPM operation for extended pump life
• Durable brass manifold construction
• Solid ceramic pistons for improved durability
• 24mm male shaft drive
• 1/2" BSP female water inlet
• 3/8" BSP female high-pressure outlet
• Suitable for professional and industrial pressure washers
• Excellent spare parts and service kit availability

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Technical Specifications

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Recommended Nozzle Size

For systems operating at 140 Bar with a flow rate of 12 litres per minute, it is recommended to use the correct nozzle size to maintain proper operating pressure and pump performance.

Using the correct nozzle size helps:

• Maintain accurate operating pressure
• Protect the pump from excessive strain
• Improve cleaning efficiency
• Reduce unnecessary wear on internal components
• Ensure proper unloader valve operation

Incorrect nozzle sizing can lead to pressure loss, overheating, poor cleaning performance, and premature pump wear.

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Industrial Applications

The Interpump W140M is suitable for a wide range of industrial and professional cleaning applications including:

• Industrial pressure washers
• Commercial vehicle cleaning
• Agricultural cleaning equipment
• Workshop cleaning systems
• Static washdown systems
• Factory and warehouse cleaning
• Hot and cold pressure washer systems
• General industrial cleaning applications

Its compact design, reliable low-speed operation, and industrial-grade construction make it ideal for demanding cleaning environments requiring long service life and dependable performance.

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Recommended Service Kits & Spare Parts

Routine servicing helps maintain pressure output, maximise pump lifespan, and reduce costly downtime. Flowjet Cleaning Equipment supplies a full range of genuine Interpump service kits and spare parts suitable for the W140M pump.

Popular service kits include:

Kit 123 – Valve Kit

Contains all 6 white valves and O-rings required for servicing and restoring pump performance.

Kit 127 – Water Seal Kit

Contains the water seals for all 3 pistons and is commonly used during routine pump maintenance.

Kit 131 – Piston Repair Kit

Contains all seals and brass collars required for one piston assembly.

Kit 23 – Oil Seal Kit

Contains the oil seals for all 3 pistons and is commonly used during pump rebuilds and servicing.

Using genuine Interpump repair kits helps maintain reliability, improve pump performance, and extend the working life of the pump.

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Common W140M Pump Repairs

In some cases, the Interpump W140M pump may develop leaks caused by cracked or damaged ceramic pistons. This can occur due to heavy use, freezing conditions, dry running, or long-term wear.

Replacing damaged ceramic pistons promptly can help prevent seal damage, pressure loss, and further internal wear.

Ceramic Piston Replacement

• Genuine Interpump ceramic piston
• Part Number: 44.0401.09
• Suitable for Interpump W140M 44 Series pumps
• Helps resolve leaks caused by damaged ceramic pistons
• Ideal during servicing and pump rebuilds

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W140M Pump Maintenance Advice

For maximum reliability and pump lifespan, it is recommended that the pump oil is replaced every 6 months minimum, particularly on heavily used industrial machines.

Routine maintenance should also include:

• Checking oil level and condition
• Inspecting seals for leaks or wear
• Monitoring valves and ceramic pistons
• Replacing worn seals before failure occurs
• Ensuring adequate clean water supply

Preventative maintenance helps reduce downtime and maintain consistent cleaning performance.

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Why Choose the Interpump W140M?

Interpump pumps are recognised worldwide for their engineering quality, reliability, and long operating life. The W140M is a popular choice within the 44 Series range thanks to its excellent balance of pressure, flow, durability, and straightforward servicing.

Its low-speed 1450RPM operation helps reduce stress on internal components, while the heavy-duty brass manifold and ceramic pistons provide excellent durability for professional cleaning applications.

Whether replacing an existing pump or building a new industrial pressure washer system, the Interpump W140M delivers dependable industrial performance backed by excellent spare parts support and service kit availability.

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Frequently Asked Questions

What pressure does the Interpump W140M produce?

The Interpump W140M delivers up to 140 Bar maximum operating pressure.

What flow rate does the W140M provide?

The W140M produces a flow rate of 12 litres per minute.

What speed does the W140M operate at?

The pump operates at 1450RPM which helps reduce wear and extend service life.

What shaft size does the W140M use?

The W140M features a 24mm male shaft.

Can I get service kits and spare parts for the W140M?

Yes, Flowjet Cleaning Equipment supplies valve kits, water seals, oil seals, piston repair kits, ceramic pistons, and replacement servicing parts for the W140M.

What causes leaks on a W140M pump?

Leaks can be caused by worn seals, damaged valves, or cracked ceramic pistons. Damaged pistons can be replaced using genuine Interpump ceramic piston part number 44.0401.09.

How often should the oil be changed?

It is recommended that the pump oil is replaced every 6 months minimum, especially on heavily used industrial pressure washers.

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Order Now

Buy the genuine Interpump W140M 44 Series Pressure Washer Pump online from Flowjet Cleaning Equipment. We supply industrial pressure washer pumps, service kits, spares, accessories, and technical support throughout the UK.

For compatibility advice, servicing information, or spare parts assistance, contact our experienced team today.

Flowjet Cleaning Equipment LTD
Unit 4, Gatebeck Farm
Gatebeck, Kendal
LA9 7FP
United Kingdom

Telephone: 015395 66193
Email: sales@flowjet.co.uk