One of our most powerful advanced cold water pressure washers, the Karcher HD 9/23 De is designed ...One of our most powerful advanced cold water pressure washers, the Karcher HD 9/23 De is designed to give you top cleaning performance in the most challenging conditions. Powered by a reliable diesel engine and with water-suction capabilities, this machine works anywhere - even with no mains power and water. This robust pressure washer has an ergonomic design and puncture-proof tyres that make it easy to move around on any surface. To prolong the life of the pump, it has a large water filter and a thermostat valve to prevent overheating. Simply attach the optional protective cage frame with eyelets when you're crane loading, and you can also add on an optional hose reel attachment kit to help you get to work more quickly on each job. As with all Karcher Professional pressure washers, this model comes with our Easy!Force trigger gun, which removes the need for squeezing force while you work so that you can clean comfortably all day long. Effortless cleaning - The ergonomically designed Easy!Force high-pressure trigger gun requires zero holding force, letting you clean comfortably, hour after hour. Quick accessory changes - Change accessories up to five times faster with robust EASY!Lock quick-release fittings. No need for mains power or water - A reliable petrol engine gives you complete independence, letting you work from anywhere, even when there's no mains power. It even sucks up water from nearby sources such as lakes or ponds, so you don't even need mains water. Easy to move - An ergonomic frame design and puncture-proof tyres make this machine easy to move around with you, even on uneven ground. Complete versatility - Add accessories to adapt it to your needs, such as a protective cage frame with eyelets for crane loading, or a hose reel kit to speed up set-up times. Built for the toughest jobs - This machine's robust frame stands up to daily use in tough conditions, while a large water filter protects the pump. A thermostat valve means it won't overheat in recirculation mode. Ideal for use wherever difficult external conditions and demanding cleaning tasks meet, the HD 9/23 DE cold-water high-pressure cleaner has a resilient Yanmar diesel engine which enables it to be operated independently of electrical power. Additionally, the machine has self-priming capability and can draw water from unpressurised sources like lakes or ponds if there is no access to a mains water supply. The HD 9/23 DE delivers 230 bar water pressure for powerful cleaning; its durable metal frame and puncture proof wheels guarantee maximum mobility and can withstand heavy duty use. The HD 9/23 DE is supplied with an EASY!Force high pressure gun (which makes use of the recoil force of the high-pressure jet to reduce the holding force for the operator to zero) while EASY!Lock quick-release fasteners make set-up and dismantling five times faster than with conventional screw connections. Features and Benefits • Diesel powered for independence from electrical supply • Yanmar L 100 N engine • Robust basic frame for daily use in tough conditions • Puncture proof wheels guarantee permanent mobility • Onboard accessory storage • Self priming - can suck up water from ponds, lakes and water tanks • Large water filter to protect the pump • Thermostat valve to protect the pump from overheating • Easy!Force gun negates recoil for controlled operation on startup • Easy!Lock connectors for rapid assembly and disassembly Specifications • Power: Diesel • Engine: Yanmar L 100 N • Flow Rate: 400 - 930 l/h • Operating Pressure (bar/MPa): 40-230 bar / 4-23 MPa • Dimensions: L.800 x W.700 x H.800mm • Weight: 104.3kg Contents • HD 9/23 DE Diesel Pressure Washer • Easy!Force Advanced Trigger Gun • High Pressure Hose (15m) • Spray Lance (1050mm) • Power Nozzle
Currently unavailable
Currently out of stock
This product is not available at the moment. Check back later or explore other options below.
The Karcher HD 9/23 DE is a powerful, diesel-powered cold water pressure washer designed for challenging cleaning tasks in demanding environments where mains power and water are unavailable. Its key benefits include complete independence from power sources, exceptional cleaning performance with 230 bar pressure, and robust, mobile design for tough conditions. A potential caveat is its reliance on diesel fuel, which requires separate fuel management and maintenance.
All features
Model Part Number
HD 9/23 DE
Brand
Karcher Pro
Extended Product Information
FAQs
Can I use this pressure washer with any Karcher accessory?
The HD 9/23 DE is equipped with EASY!Lock quick-release fittings, making it compatible with Karcher accessories that also feature the EASY!Lock system. Standard screw-type accessories may require an adapter.
How do I ensure the pump is protected from damage?
The machine has a large water filter to prevent debris from entering the pump and a thermostat valve to prevent overheating, especially when the trigger is released (recirculation mode). Always ensure an adequate water supply and keep the filter clean.
What is the benefit of the Easy!Force trigger gun?
The Easy!Force trigger gun uses the recoil force of the high-pressure jet to counteract the trigger pull, meaning you don't need to exert any holding force. This significantly reduces fatigue during prolonged use.
What is the maximum lift height for water suction?
While the machine is self-priming and can draw water from sources like ponds or lakes, the maximum suction lift depends on the depth of the water source and the height difference. Refer to the manual for specific limitations, but typically it's designed for drawing from sources at or near ground level.
How often should the diesel engine be serviced?
Regular maintenance for the Yanmar L 100 N diesel engine, including oil changes, fuel filter replacement, and air filter cleaning, should be performed according to the engine manufacturer's recommended schedule, typically outlined in the engine's user manual.
Is this pressure washer suitable for residential use?
The HD 9/23 DE is designed for heavy-duty, professional applications due to its power and diesel engine. For typical residential cleaning tasks, a smaller electric or petrol model might be more suitable and easier to manage.
Troubleshooting
Machine will not start.
Check diesel fuel level, ensure battery is charged for electric start, and verify all safety cut-offs are disengaged. Consult engine manual for specific startup procedures.
Low water pressure.
Check for kinks in the water inlet or high-pressure hose. Ensure the water source has adequate flow and is not too low for the self-priming function. Clean the water filter. Verify the correct nozzle is attached.
Water leaks from connections.
Ensure EASY!Lock fittings are securely connected and seals are intact. Check the high-pressure hose and lance for any damage.
Engine running rough or shutting off.
Check the diesel fuel quality, clean or replace the fuel filter, and inspect the air filter. Refer to the Yanmar engine manual for specific troubleshooting steps.
Pump overheating.
Ensure the water filter is clean and the machine is adequately supplied with water. Check that the thermostat valve is functioning correctly and not blocked.
Pros and Cons
Pros
Operates independently of electrical power, ideal for remote sites.
Can draw water from alternative sources, increasing operational flexibility.
High pressure output (230 bar) ensures effective cleaning of tough dirt.
Durable construction with puncture-proof wheels for reliable mobility.
Ergonomic Easy!Force trigger gun reduces user fatigue during prolonged use.
Quick-connect fittings (EASY!Lock) save time during setup and takedown.
Cons
Requires diesel fuel, necessitating separate fuel management.
Diesel engine operation may produce emissions and noise.
Heavier than electric models due to diesel engine and robust frame.
Initial setup for diesel engine operation might be more involved than electric models.
Regular engine maintenance is required for optimal performance and longevity.
Setup, Compatibility & Care
Setup:
Ensure the machine is placed on a stable, level surface.
Fill the diesel engine with the appropriate fuel.
Connect the high-pressure hose to the machine and the Easy!Force trigger gun using the EASY!Lock fittings.
Connect the spray lance and power nozzle to the trigger gun.
If not using a mains water supply, submerge the inlet hose (with filter) into a water source (e.g., pond, tank) and engage the self-priming function as per the engine manual.
Ensure the water filter is clean and properly installed.
Start the diesel engine following the manufacturer's instructions.
Engage the trigger gun to begin operation.
Compatibility:
The HD 9/23 DE is designed to work with Karcher's range of EASY!Lock accessories, including various lances, nozzles, and surface cleaners.
Optional accessories like the protective cage frame and hose reel kit can be attached to enhance functionality and convenience.
Care:
Engine Maintenance: Regularly check and maintain the diesel engine according to the Yanmar L 100 N manual. This includes oil checks, fuel filter changes, and air filter cleaning.
Water Filter: Clean the large onboard water filter regularly to prevent blockages and protect the pump.
Pump Protection: Ensure the thermostat valve is functioning correctly. Avoid running the machine dry.
Storage: Store the machine in a clean, dry place. Drain water from the system if storing in freezing conditions.
Cleaning: Wipe down the exterior with a damp cloth. Avoid using harsh solvents.
Karcher K 7 WCM Flex Eco!Booster Pressure Washer - 180 BarFrom £399View product 
Kärcher K 5 Classic Pressure Washer - 145 bar, 2100WFrom £200View product 
Karcher K 5 WCM Flex Eco Booster Pressure Washer - Yellow - Car & HomeFrom £291View product 
Ryobi 18V ONE+™ 22bar Cordless Power Washer KitFrom £150View product