User Manual for Clarke Tiger 1800B Petrol Pressure Washer
Quick guide for the Clarke Tiger 1800B petrol pressure washer. Includes setup, starting procedures, maintenance, troubleshooting, and safety instructions.
Table of contents
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This manual provides essential instructions for the safe operation and maintenance of the Clarke Tiger 1800B petrol pressure washer. Always read the safety rules before use. The machine is designed for outdoor use only and requires proper oil and fuel levels before operation. Ensure a system separator (backflow preventer) is installed when connecting to a mains water supply.
Safety Rules
- Do not point the spray at people, animals, or electrical equipment.
- Always wear protective clothing and safety glasses.
- Do not operate the machine with covers removed.
- Use only recommended hoses, fittings, and couplings.
- Do not use flammable liquids or solvents in the detergent pickup.
- Always release system pressure before removing hoses or accessories.
Overview
The pressure washer features a petrol engine, fuel tank, recoil starter, and high-pressure pump. Key components include the gun assembly, lance, water inlet, and detergent hose. Refer to the overview diagram for the location of the fuel tank cap, choke, throttle, and engine switch.

Unpacking and Assembly
Unpack the unit and verify all parts are present, including the hose bracket, lance bracket, water bottle, and suction hose. Attach the hose storage bracket, lance storage bracket, and water bottle bracket to the frame using the supplied bolts, nuts, and washers.



Before Use
Engine Oil: The engine is supplied without oil. Use SAE10W-30 oil. Check the level using the dipstick on the oil filler cap; do not overfill (Max 0.6L). Fuel: Use unleaded petrol (86 octane or higher). Do not fill above the fuel strainer shoulder.
Starting Your Pressure Washer

- Turn on the water supply fully.
- Set the choke lever to the START position.
- Set the fuel supply valve to the ON position.
- Slide the throttle 3/4 of the way to the left.
- Set the engine switch to the ON (I) position.
- Pull the recoil starting handle until resistance is felt, then pull sharply.
- Once started, slide the choke lever to the RUN position.
- Release the trigger lock and pull the trigger to start water flow.
Operation
Adjusting Nozzle: Twist the nozzle to vary the spray between narrow (for small areas) and wide (for large areas). Adjusting Pressure: Slide the front of the nozzle forward for low pressure and backward for high pressure. Chemicals: Place the detergent pickup hose into the cleaning solution. Slide the nozzle to low pressure to apply detergent.

Maintenance
- Nozzle: Clean blockages with the provided tool and back flush with water.
- Water Inlet Filter: Remove and flush both sides with water.
- Fuel Strainer: Check periodically and remove accumulated contaminants.
- Air Filter: Wash in warm water and mild detergent, dry, and immerse in clean engine oil.
- Spark Plug: Check condition and gap (0.7-0.8 mm).
Troubleshooting
If the engine fails to start, check for fuel, oil, spark plug connection, engine switch position, and choke setting. If pressure is lacking, check for hose leaks, nozzle obstructions, or air in the hose. Water leaking from the drain hose is a normal safety feature to cool the pump.
Specifications
The engine is a 98cc OHV single-cylinder 4-stroke. Maximum pump pressure is 110 Bar, with a working pressure of 70 Bar. Water flow is 6 L/min. The unit weighs 19 kg.
Manufacturer information
Clarke International
Practical help
Common problems
Check fuel level, oil level, spark plug lead, engine switch (ON), choke position, and fuel valve (OPEN).
Tighten hose fittings, clear nozzle obstruction, clean water filter, purge air from hose, or adjust throttle.
This is a normal safety feature to cool the pump; it is expected behavior.
Clean chemical filter, dilute chemicals to water consistency, or check for chemical build-up in the injector.
Before use
- Place the pressure washer on level ground.
- Check engine oil level (SAE10W-30, max 0.6L).
- Check fuel level (unleaded petrol, max 1.6L).
- Connect water supply with a system separator (backflow preventer).
- Ensure all hoses and the lance are securely connected.
- Release the trigger lock before starting.
Specs in practice
- Max Pump Pressure
- 110 Bar
- Working Pressure
- 70 Bar
- Engine Capacity
- 98 cc
- Max Water Flow
- 6 L/min
Images and diagrams
- Overview diagram identifies 19 key components including fuel tank, choke, and pump connections.
- Exploded diagram illustrates the assembly of the frame and components for maintenance.
Model compatibility
- Requires a system separator (backflow preventer) when connected to mains water.
- Use only detergents suitable for pressure washers (e.g., Clarke Traffic Film Remover).
Manual page author
David Miller
Documentation analyst
Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.