Mi-T-M 851-0440 Spray Gun & Wand Assembly – Genuine OEM Replacement Trigger Gun with Handle, 48" Lance & Quick Connects
Part Number: 851-0440
Category: Pressure Washer Parts & Accessories → Spray Components → Trigger Gun & Wand Assemblies
Type: Mi-T-M 851-0440 Spray Gun & Wand Assembly – Genuine OEM Replacement Trigger Gun with Handle, 48" Lance & Quick Connects
The Mi-T-M 851-0440 Spray Gun & Wand Assembly is a genuine OEM replacement spray assembly designed for compatible Mi-T-M pressure washers. This complete assembly includes a trigger gun with handle, a 48-inch lance, and quick-connect fittings for convenient attachment to compatible high-pressure hoses and spray nozzles. Manufactured to original equipment specifications, it helps restore controlled water delivery, comfortable handling, extended cleaning reach, and dependable pressure-washer operation.
Key Features & Benefits
- Part Number: 851-0440
- Genuine OEM Mi-T-M replacement assembly
- Includes trigger gun, handle, lance, and quick connects
- 48-inch spray lance
- Provides controlled high-pressure water delivery
- Extended reach for convenient surface cleaning
- Quick-connect fittings support efficient setup and nozzle changes
- Helps restore proper spray control and pressure-washer functionality
- Replaces a leaking, cracked, worn, or damaged gun and wand
- Suitable for professional pressure-washing applications
- Manufactured to original equipment specifications
- Complete assembled replacement for compatible equipment
Technical Specifications
- Part Number: 851-0440
- Manufacturer: Mi-T-M
- Product Type: Spray Gun & Wand Assembly
- Component Type: Pressure Washer Trigger Gun and Lance
- Lance Length: 48 Inches
- Included Components: Trigger Gun, Handle, Lance, and Quick Connects
- Connection Type: Quick Connect
- Application: High-pressure water delivery and spray control
- Installation Location: Between the high-pressure hose and spray nozzle
- OEM Part: Yes
- Quantity: One Complete Assembly
Compatible Applications
The Mi-T-M 851-0440 Spray Gun & Wand Assembly is designed for select:
- Mi-T-M pressure washers
- Compatible high-pressure hoses
- Compatible quick-connect spray nozzles
- Commercial and industrial pressure-washing systems
- Equipment and property-cleaning applications
- Pressure washers requiring OEM assembly 851-0440
Always verify the pressure-washer model, serial number, operating pressure, flow rate, inlet and outlet connection sizes, quick-connect configuration, temperature rating, parts diagram, and original part number before ordering.
Function of the Spray Gun & Wand Assembly
The 851-0440 Spray Gun & Wand Assembly is designed to:
- Control the release of pressurized water
- Direct water through the 48-inch spray lance
- Provide extended reach during pressure-washing tasks
- Support secure connection to compatible hoses and nozzles
- Allow convenient nozzle changes through quick-connect fittings
- Improve operator control and cleaning accuracy
- Restore proper spray-gun and wand functionality
- Replace a leaking, worn, damaged, or malfunctioning assembly
A correctly matched spray assembly is essential for safe pressure control, dependable nozzle retention, and effective pressure-washer performance.
Common Signs Replacement Is Needed
Replace the spray gun and wand assembly if you notice:
- Water leaking from the trigger gun or fittings
- Trigger sticks, binds, or fails to shut off
- Cracked or damaged gun housing
- Bent, corroded, or damaged lance
- Quick-connect fittings no longer lock securely
- Excessive wear around the inlet or outlet connections
- Reduced or inconsistent spray performance
- Water continues flowing after releasing the trigger
- Excessive movement between assembled components
- Impact, freeze, heat, or chemical damage
Spray problems may also result from a worn pump, clogged nozzle, restricted hose, damaged unloader, or inadequate water supply. Inspect the complete pressure-washer system before assuming the gun and wand assembly is the only cause.
Installation & Service Notes
- Shut down the pressure washer and turn off the water supply.
- Disconnect the power source or spark-plug wire when applicable.
- Squeeze the existing trigger gun to release trapped system pressure.
- Allow the engine, pump, hose, and hot components to cool completely.
- Disconnect the existing gun assembly from the high-pressure hose.
- Inspect the hose fitting, couplers, seals, and O-rings for wear or damage.
- Confirm that the replacement assembly matches all required connections and ratings.
- Connect the high-pressure hose securely to the trigger-gun inlet.
- Install a properly sized spray nozzle into the lance’s quick-connect fitting.
- Pull gently on each quick-connect fitting to confirm secure engagement.
- Turn on the water supply and inspect all connections for leakage.
- Point the lance in a safe direction before starting the pressure washer.
- Test the trigger and shutoff operation at low pressure when possible.
Important: The replacement gun, lance, quick connects, hose, and nozzle must meet or exceed the pressure washer’s operating pressure, flow rate, and temperature requirements. Never install, disconnect, or service spray components while the system is operating or pressurized.
Safety Recommendations
- Never point the spray gun at people, animals, electrical equipment, or fragile surfaces.
- Always engage the trigger safety lock when the gun is unattended.
- Never wire, tie, or otherwise secure the trigger in the open position.
- Wear eye protection, gloves, closed-toe footwear, and suitable protective clothing.
- Maintain stable footing and hold the spray gun securely during operation.
- Expect significant reaction force when the trigger is pulled.
- Keep hands and other body parts away from the high-pressure spray.
- Never check for leaks using your fingers or skin.
- Do not operate the assembly if the trigger or shutoff mechanism is damaged.
- Seek immediate medical care for any high-pressure injection injury.
Maintenance Recommendations
- Inspect the trigger gun, lance, and fittings before each use.
- Check for cracks, corrosion, leaks, binding, and loose connections.
- Confirm that all quick-connect fittings lock securely.
- Keep fittings and nozzle connections free of dirt and debris.
- Replace damaged O-rings and seals with approved components.
- Flush the assembly with clean water after chemical application.
- Release trapped pressure before storage or service.
- Protect the assembly from freezing temperatures.
- Store the gun and wand in a clean, dry location.
- Do not use the assembly as a lever or striking tool.
- Use genuine OEM replacement parts to maintain proper fit, control, and dependable pressure-washer operation.
