Predator 4400 PSI, 4.2 GPM, 64931 - Commercial Duty Pressure Washer Manual

Table of Contents

Contents

1 Specifications
- 1.1 Unit Specifications
- 1.2 Engine Specifications
2 WARNING SYMBOLS AND DEFINITIONS
3 Symbol Definitions
4 IMPORTANT SAFETY INSTRUCTIONS
5 Set Up
6 Operation
7 Maintenance
8 Troubleshooting
9 Documents / Resources
- 9.1 References
- 9.2 Download manual

Specifications

Unit Specifications

Pump		Triplex
Pump Oil	Type SAE	15W-40
	Capacity	12 Ounces (0.36 Liter)
Drive		Direct
Maximum Pressure		4400 PSI
Flow Rate		4.2 GPM
Hose Length		50'
Wand Length		31"
Nozzles		Quick Connect 0°, 15°, 25°, 40° + Soap Nozzle

Engine Specifications

Displacement		420 cc
Engine Type		Horizontal Single Cylinder 4-stroke OHV
Cooling System		Forced air cooled
Fuel	Type	87+ octane stabilizer treated unleaded gasoline
	Capacity	1.45 Gallon (5.4 Liter)
Engine Oil	Type SAE	10W-30 above 32°F 5W-30 at 32°F or below
	Capacity	1.16 Quart (1.1 Liter)
Run Time @ 50% Load with full tank		2 hr.
Bore x Stroke		90 mm x 66 mm
Compression Ratio		8.8:1
Rotation viewed from PTO (power takeoff - the output shaft)		Counterclockwise
Spark Plug	Type	NHSP / Torch F7TC
	Gap	0.027" – 0.031"
Valve Clearance	Intake	0.004" – 0.006"
	Exhaust	0.004" – 0.006"

The emissions control system for this Engine is warranted for standards set by the U.S. Environmental Protection Agency. For warranty information, refer to the last pages of this manual.

WARNING SYMBOLS AND DEFINITIONS

	This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.
	Indicates a hazardous situation which, if not avoided, will result in death or serious injury.
	Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
	Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
NOTICE	Addresses practices not related to personal injury.

Symbol Definitions

Symbol	Property or Statement
RPM	Revolutions Per Minute
HP	Horsepower
	WARNING marking concerning Risk of Eye Injury. Wear ANSI-approved safety goggles with side shields.
	Read the manual before set-up and/or use.
	WARNING marking concerning Risk of Hearing Loss. Wear hearing protection.
	WARNING marking concerning Risk of Respiratory Injury. Operate engine OUTSIDE and far away from windows, doors, and vents.
	WARNING marking concerning Risk of Fire while handling fuel. Do not smoke while handling fuel.
	WARNING marking concerning Risk of Fire. Do not refuel while operating. Keep flammable objects away from engine.
	WARNING marking concerning Risk of Injection. Do not direct water stream/nozzle at body.

IMPORTANT SAFETY INSTRUCTIONS

burn hazard
Read all instructions.
Failure to follow all instructions listed below may result in fire, serious injury and/or DEATH. The warnings and precautions discussed in this manual cannot cover all possible conditions and situations that may occur. It must be understood by the operator that common sense and caution are factors which cannot be built into this product, but must be supplied by the operator.
SAVE THESE INSTRUCTIONS

Using an engine indoors CAN KILL YOU IN MINUTES. Engine exhaust contains carbon monoxide. This is a poison you cannot see or smell.

NEVER use inside a home or garage, EVEN IF doors and windows are open.

Only use OUTSIDE and far away from windows, doors, and vents.

When unpacking, make sure that the product is intact and undamaged. If any parts are missing or broken, please call 1-888-866-5797 as soon as possible.

Set Up Precautions

Gasoline fuel and fumes are flammable, and potentially explosive. Use proper fuel storage and handling procedures. Do not store fuel or other flammable materials nearby.
Have multiple ABC class fire extinguishers nearby.
Operation of this equipment may create sparks that can start fires around dry vegetation. A spark arrestor may be required. The operator should contact local fire agencies for laws or regulations relating to fire prevention requirements.
Set up and use only on a flat, level, well-ventilated surface.
The work area should have adequate drainage to reduce the possibility of a fall due to slippery surfaces.
Wear ANSI-approved safety goggles, heavy-duty work gloves, and dust mask/respirator during set up.
Use only lubricants and fuel recommended in the Specifications chart of this manual.
Only use cold water or pressure washer detergent in this tool. Do not use caustic materials, solvents, flammable materials, or detergents not designed for pressure washers. Use of any such material can cause injury, or damage this tool or personal property.
Do not dry run this product. Dry running will cause serious damage to the seals. Make sure the water supply used for the Pressure Washer is not dirty or sandy.
Prior to starting the Pressure Washer in cold weather, check all of the parts of the unit to make sure ice has not formed. Do not store the unit anywhere that the temperature will fall below 32°F (0°C).

Operating Precautions

CARBON MONOXIDE HAZARD
Using an engine indoors CAN KILL YOU IN MINUTES.
Engine exhaust contains carbon monoxide. This is a poison you cannot see or smell.

NEVER use inside a home or garage, EVEN IF doors and windows are open.

Only use OUTSIDE and far away from windows, doors, and vents.
Keep children away from the equipment, especially while it is operating.
Parts of the Pressure Washer, especially exhaust system components, get very hot during use. Stay clear of hot parts.
Injection Hazard! The high pressure water jet produced by this tool can cut skin or cause injury to hands or eyes.
Do not allow spray to strike you and do not spray toward people or animals. Do not spray the tool itself or any electrical wiring/receptacle.
Do not carry the spray handle with your finger on the trigger, whether engine is operating or not.
In case of an emergency during use, immediately release the trigger on the spray handle, turn the engine off and then shut off gas supply to the engine. Do not set the spray handle down without turning off the engine.
This Pressure Washer is intended for outdoor residential use only.
The high pressure water flow can damage the work surface if not used properly. Always test the spray in an open area first.
When dispensing detergent, apply the detergent to the cleaning area at low pressure only. Detergent dispensing only works when the spray wand is in the low-pressure position.
Keep all spectators at least six feet from the Engine during operation.
Do not fill fuel tank while engine is running. Do not operate if gasoline has been spilled.
Clean spilled gasoline before starting engine. Do not operate near pilot light or open flame.
Do not touch engine during use. Let engine cool down after use.
Do not leave the equipment unattended when it is running. Turn off the equipment (and remove safety keys, if available) before leaving the work area.
The equipment can produce high noise levels. Prolonged exposure to noise levels above 85 dBA is hazardous to hearing. Wear ear protection when operating the equipment or when working nearby while it is operating.
Wear ANSI-approved safety glasses and hearing protection during use.
People with pacemakers should consult their physician(s) before use. Electromagnetic fields in close proximity to a heart pacemaker could cause pacemaker interference or pacemaker failure. Caution is necessary when near the engine's magneto or recoil starter.
Use only accessories that are recommended by Harbor Freight Tools for your model. Accessories that may be suitable for one piece of equipment may become hazardous when used on another piece of equipment.
Do not operate in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust. Gasoline-powered engines may ignite the dust or fumes.
Stay alert, watch what you are doing and use common sense when operating this piece of equipment. Do not use while tired or under the influence of drugs, alcohol or medication.
Do not overreach. Keep proper footing and balance at all times. This enables better control of the equipment in unexpected situations.
Use this equipment with both hands only. Using equipment with only one hand can easily result in loss of control.
Dress properly. Do not wear loose clothing or jewelry. Keep hair, clothing and gloves away from moving parts. Loose clothes, jewelry or long hair can be caught in moving parts.
Do not cover the engine or equipment during operation.
Keep the equipment, engine, and surrounding area clean at all times.
Do not smoke, or allow sparks, flames, or other sources of ignition around the equipment, especially when refuelling.
Use the equipment, accessories, etc., in accordance with these instructions and in the manner intended for the particular type of equipment, taking into account the working conditions and the work to be performed. Use of the equipment for operations different from those intended could result in a hazardous situation.
Do not operate the equipment with known leaks in the engine's fuel system.
When spills of fuel or oil occur, they must be cleaned up immediately. Dispose of fluids and cleaning materials as per any local, state, or federal codes and regulations. Store oil rags in a bottom-ventilated, covered, metal container.
Keep hands and feet away from moving parts. Do not reach over or across equipment while operating.
Before use, check for misalignment or binding of moving parts, breakage of parts, and any other condition that may affect the equipment's operation. If damaged, have the equipment serviced before using. Many accidents are caused by poorly maintained equipment.
Use the correct equipment for the application. Do not modify the equipment and do not use the equipment for a purpose for which it is not intended.

Vibration Precautions

This tool vibrates during use. Repeated or long-term exposure to vibration may cause temporary or permanent physical injury, particularly to the hands, arms and shoulders. To reduce the risk of vibration-related injury:

Anyone using vibrating tools regularly or for an extended period should first be examined by a doctor and then have regular medical checkups to ensure medical problems are not being caused or worsened from use. Pregnant women or people who have impaired blood circulation to the hand, past hand injuries, nervous system disorders, diabetes, or Raynaud's Disease should not use this tool. If you feel any medical or physical symptoms related to vibration (such as tingling, numbness, and white or blue fingers), seek medical advice as soon as possible.
Do not smoke during use. Nicotine reduces the blood supply to the hands and fingers, increasing the risk of vibration-related injury.
Wear suitable gloves to reduce the vibration effects on the user.
Use tools with the lowest vibration when there is a choice between different processes.
Include vibration-free periods each day of work.
Grip tool as lightly as possible (while still keeping safe control of it). Let the tool do the work.
To reduce vibration, maintain the tool as explained in this manual. If any abnormal vibration occurs, stop use immediately.

Service Precautions

Before service, maintenance, or cleaning:
1. Turn the engine switch to its "OFF" position.
2. Allow the engine to completely cool.
3. Then, remove the spark plug cap from the spark plug.
Keep all safety guards in place and in proper working order. Safety guards include muffler, air cleaner, mechanical guards, and heat shields, among other guards.
Do not alter or adjust any part of the equipment or its engine that is sealed by the manufacturer or distributor. Only a qualified service technician may adjust parts that may increase or decrease governed engine speed.
Wear ANSI-approved safety goggles, heavy-duty work gloves, and dust mask/respirator during service.
Keep the high pressure hose connected to the pressure washer and spray gun while the system is pressurized. Disconnecting the pressure hose while the unit is pressurized is dangerous, and may cause injury.
Do not allow the high pressure hose to come in contact with any hot part of the unit. The hose might be damaged, possibly causing it to burst or leak under high pressure.
Maintain labels and nameplates on the equipment. These carry important information. If unreadable or missing, contact Harbor Freight Tools for a replacement.
If water is leaking out of the Pressure Washer immediately turn off the unit. Unplug the Pressure Washer, and discharge all pressure before tightening fittings or having repair work done by a qualified technician.
When the engine is running, do not allow the Pressure Washer to remain idle for more than two minutes. If allowed to remain idle, the water in the unit will heat up, possibly causing damage to the Pressure Washer.
Have the equipment serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the equipment is maintained. Do not attempt any service or maintenance procedures not explained in this manual or any procedures that you are uncertain about your ability to perform safely or correctly.
Store equipment out of the reach of children.
Follow scheduled engine and equipment maintenance.

Refueling:

Do not refill the fuel tank while the engine is running or hot.
Do not smoke, or allow sparks, flames, or other sources of ignition around the equipment, especially when refuelling.
Do not fill fuel tank to the top.
Leave a little room for the fuel to expand as needed.

TO PREVENT FUEL LEAKAGE AND
FIRE HAZARD, do not fill fuel above the bottom of fuel strainer.
Refuel in a well-ventilated area only.
Wipe up any spilled fuel and allow excess to evaporate before starting engine.
To prevent FIRE, do not start the engine while the smell of fuel hangs in the air.

warning SAVE THESE INSTRUCTIONS.

Set Up

warning Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this manual including all text under subheadings therein before set up or use of this product.

TO PREVENT SERIOUS INJURY: Operate only with proper spark arrestor installed.

burn hazard Operation of this equipment may create sparks that can start fires around dry vegetation.
A spark arrestor may be required.
The operator should contact local fire agencies for laws or regulations relating to fire prevention requirements.

TO PREVENT SERIOUS INJURY FROM ACCIDENTAL STARTING: Turn the Power Switch of the equipment to its "OFF" position, wait for the engine to cool, and unplug the spark plug wire(s) before assembling or making any adjustments to the equipment.

Note: For additional information regarding the parts listed in the following pages, refer to the Assembly Diagrams near the end of this manual.

Assembly

Attach the High Pressure Hose Hanger (15) to the Upper Frame Handle (14) using two Lock Nuts (13). Tighten securely.
Slide the Upper Frame Handle (14) over the two upright tubes on the Frame (2) and press down until Handle is seated and two Detent Pins snap into place.
Slide the Front Frame Handle (20) over the two angled tubes on the Upper Frame Handle and press down until Handle is seated and two Detent Pins snap into place.
Remove the red shipping plug from the Pump (22) and replace with the included Pump Dipstick.
Connect the Pressure Hose (26) to the Outlet Fitting on the Pump (22) by pulling back the quick connect collar and pushing the Hose into the fitting. Connect the water supply hose to the water inlet connection on the Pump and hand-tighten the Inlet Fitting. The water source must be able to provide a minimum of five gallons of clean, cold water per minute at 40 PSI. Only use a 5/8' inner diameter (or larger) hose that is rated to meet this capacity.
Connect the Pressure Hose to the handle of the Spray Gun (25) by pulling back the quick connect collar on the Hose and pushing the Hose onto the handle fitting. Squeeze the Trigger for one minute to purge air from the system.
Remove the protective cap on the Wand (24) inlet. Insert the Wand into the Spray Gun tip and firmly hand-tighten the nut.
Attach the desired Nozzle to the Wand by pulling back the quick connect collar and pushing the Nozzle onto the end of the Wand. Make sure the quick connect collar locks the Nozzle in place.

Components and Controls

Engine Controls

High Altitude Operation Above 2000 feet

burn hazard
TO PREVENT SERIOUS INJURY FROM FIRE:
Follow instructions in a well-ventilated area away from ignition sources.
If the engine is hot from use, shut the engine off and wait for it to cool before proceeding. Do not smoke.

NOTICE: Warranty void if necessary adjustments are not made for high altitude use.

At high altitudes, the engine's carburetor, governor (if so equipped), and any other parts that control the fuel-air ratio will need to be adjusted by a qualified mechanic to allow efficient high-altitude use and to prevent damage to the engine and any other devices used with this product. The fuel system on this engine may be influenced by operation at higher altitudes. Proper operation can be ensured by installing an altitude kit at altitudes higher than 2000 ft. above sea level. At elevations above 7000 ft, the engine may experience decreased performance, even with the proper main jet. Operating this engine without the proper altitude kit installed may increase the engine's emissions and decrease fuel economy and performance. The kit should be installed by a qualified mechanic.

Turn off the engine.
Close the fuel valve.
Place a bowl under the fuel cup to catch any spilled fuel.

Carburetor bowl may have gas in it which will leak upon removing the bolt.

Unthread the bolt holding the fuel cup.
Remove the bolt, Bolt Seal, fuel cup, Fuel Cup Seal and Main Jet from the body of the carburetor assembly. A carburetor screwdriver (not included) is needed to remove and install the Main Jet.

Note: The mixing tube is held in place by the Main Jet and might fall out when it is removed. If it falls out, replace it in the same orientation before replacing the Main Jet.

Replace the Main Jet with the replacement Main Jet needed for your altitude range (part 1a, 2a, 3a, or 4a).

Note: The Fuel Cup Seal and Bolt Seal may be damaged during removal and should be replaced with the new ones from the kit.

Replace the Fuel Cup Seal (6a), fuel cup, Bolt Seal (5a), and bolt. Tighten in place.

NOTICE: Do not cross thread bolt when tightening.

Finger tighten first and then use a wrench to make sure the bolt is properly threaded.

Wipe up any spilled fuel and allow excess to evaporate before starting engine.
To prevent FIRE, do not start the engine while the smell of fuel hangs in the air.

High Altitude Kit Parts List – A

Part	Description	Qty
1a	Main Jet 2000 – 3000 ft.	1
2a	Main Jet 3000 – 5 000 ft.	1
3a	Main Jet 5000 – 6 000 ft.	1
4a	Main Jet 6000 – 7000 ft.	1
5a	Bolt Seal	1
6a	Fuel Cup Seal	1

Operation

warning Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this manual including all text under subheadings therein before set up or use of this product.

Pre-Start Checks

Inspect engine and equipment looking for damaged, loose, and missing parts before set up and starting. If any problems are found, do not use equipment until fixed properly.

Checking and Filling Engine Oil

NOTICE: Your Warranty is VOID if the engine's crankcase is not properly filled with oil before each use. Before each use, check the oil level. Engine will not start with low or no engine oil.

Make sure the engine is stopped and is level.
Close the Fuel Valve.
Clean the top of the Dipstick and the area around it. Remove the Dipstick by turning it counterclockwise, and wipe it off with a clean, lint free rag.
Reinsert the Dipstick without threading it in and remove it to check the oil level. The oil level should be up to the full level as shown below.
If the oil level is at or below the low mark add the appropriate type of oil until the oil level is at the proper level. SAE 10W-30 oil is recommended for general use. (The SAE Viscosity Grade chart in the Maintenance section shows other viscosities to use in different average temperatures.)
Thread the dipstick back in clockwise.

NOTICE: Do not run the engine with too little oil. Engine will shut off if engine oil level is too low.

Checking and Filling Fuel

burn hazard
TO PREVENT SERIOUS INJURY FROM FIRE:
Fill the fuel tank in a well-ventilated area away from ignition sources. If the engine is hot from use, shut the engine off and wait for it to cool before adding fuel. Do not smoke.

Clean the Fuel Cap and the area around it.
Unscrew and remove the Fuel Cap.
Remove the Strainer and remove any dirt and debris. Then replace the Strainer.

Note: Do not use gasoline containing more than 10% ethanol (E10). Do not use E85 ethanol.

Note: Do not use gasoline that has been stored in a metal fuel container or a dirty fuel container. It can cause particles to enter the carburetor, affecting engine performance and/or causing damage.

If needed, fill the Fuel Tank to about 1 inch under the fill neck of the Fuel Tank with 87 octane or higher unleaded gasoline that has been treated with a fuel stabilizer additive. Follow fuel stabilizer manufacturer's recommendations for use.
Then replace the Fuel Cap.
Wipe up any spilled fuel and allow excess to evaporate before starting engine.
To prevent FIRE, do not start the engine while the smell of fuel hangs in the air.

Starting the Engine

warning Before Starting the Engine

Inspect the equipment and engine.
Fill the engine with the proper amount and type of both stabilizer-treated unleaded gasoline and oil.
TURN ON WATER SUPPLY, REMOVE NOZZLE, POINT WAND IN SAFE DIRECTION, AND HOLD DOWN TRIGGER FOR 1 MINUTE UNTIL ALL AIR IS RELEASED FROM THE SYSTEM. Then release Trigger, lock in the safety position and replace Nozzle before starting engine.

Manual Start

Turn Pressure Regulator counterclockwise to reduce pressure in the system.
To start a cold engine, move the Choke to the START position. To restart a warm engine, leave the Choke in the RUN position.
Open the Fuel Valve.
Slide the Throttle to 1/3 away from the SLOW position (the "turtle").
Turn the Engine Switch on.
Grip the Starter Handle of the Engine loosely and pull it slowly two times to allow the gasoline to flow into the Engine's carburetor. Then pull the Starter Handle gently until resistance is felt. Allow Cable to retract fully and then pull it quickly. Repeat until the engine starts.

Note: Do not let the Starter Handle snap back against the engine. Hold it as it recoils so it doesn't hit the engine. If engine does not start, check engine oil level. Engine will not start with low or no engine oil.

Allow the Engine to run for several seconds. Then, if the Choke lever is in the START position, move the Choke Lever very slowly to its RUN position.

Note: Moving the Choke Lever too fast could stall the engine.

Break-in Period:

Breaking-in the engine will help to ensure proper equipment and engine operation.
The operational break-in period will last about 3 hours of use. During this period:

Do not apply a heavy load to the equipment.
Do not operate the engine at its maximum speed.

The maintenance break-in period will last about 20 hours of use.
- Change the engine oil after this period.

Under normal operating conditions subsequent maintenance follows the schedule explained in the MAINTENANCE section.

Unit Operation

Do not direct spray from the Pressure Washer at a person or an animal.
The water stream could cause serious injury.

Use the Pressure Washer only on surfaces able to withstand the force of the spray.

Choose the Nozzle that best meets the needs of the job. See Chart below. Only use the Nozzles on surfaces capable of withstanding the force of the spray. Only use the Black Nozzle when using pressure washer detergent. The power of the other Nozzles will propel mist back at the operator and can embed detergent into the surface.

NOZZLE SELECTION CHART
NOZZLE	USE FOR
Black – Low Pressure	Use with pressure washer detergent.
White – Wide Spray	Moderate cleaning for autos and boats.
Green – Medium Spray	Standard cleaning for driveways and paint removal.
Yellow – Narrow Spray	Heavy cleaning for decks and siding.
Red – Pencil Spray	Intense cleaning for stubborn stains and dirt. Use only on hard surfaces – can damage concrete, wood, paint, etc.

Pull back the quick connect collar and push the Nozzle onto the end of the Wand. Make sure the quick connect collar locks the Nozzle in place.

If using detergent:
Read detergent directions. Only use detergents specified for use with pressure washers. Connect the Detergent Siphon Tube (27) to the nipple on the Pressure Hose connection area of the Pump. See illustration below. Submerge the strainer end of the Detergent Siphon Tube into the container of prepared detergent solution. Only use the Black (low pressure) Nozzle when spraying detergents.
Unit Operation - Using detergent

With water supply on and Engine running following directions in Starting the Engine, unlock and hold down the Trigger to start the stream. Be aware that when it is first started, the gun will kick.
Start with a low pressure Nozzle, and gradually use higher pressures as needed. Test spray the edge of the surface to be cleaned first to make sure that the stream is not too strong for the surface. If the stream damages the surface, move further away from the surface being cleaned to reduce the pressure being applied to the surface. If the stream is still too strong, lock the Trigger in the safety position and change to a lower pressure Nozzle.
Hold the Wand at about a 45° angle when cleaning; spraying the surface directly could embed dirt into the surface (especially with the high pressure Nozzles). Spray at a distance of about three to five feet.
Clean vertical and sloped surfaces from the top down.
When cleaning horizontal surfaces, occasionally use the stream to clear the area of excess water.

Do not allow the Pressure Washer to idle without the Trigger held down for more than two minutes. The water will heat up and damage the Pressure Washer.

The Pump will expel very hot water if allowed to idle too long.

Note: During normal operation the Thermal Relief Valve may release small amounts of water intermittently.

Hold the Trigger down and move the Wand back and forth slowly and steadily to pressure wash the surface. Take special care when spraying surfaces made of two different materials (brick and mortar, for example), so as to not damage the softer of the two materials during pressure washing.
If the surface is streaked or uneven at the end of a job, switch to a Nozzle that has a wider spray pattern to blend the affected area.

Stopping the Engine and Pressure Washer

To stop the engine in an emergency, turn the Engine Switch off.
Under normal conditions, use the following procedure:
1. Release the Trigger on the Spray Gun handle.
2. Slide the Throttle to the SLOW position (the "turtle").
3. Turn the Engine Switch off.
4. Close the Fuel Valve.
5. Turn the water supply off.
Point Spray Gun in safe direction and squeeze Trigger 5 seconds to release excess pressure.
If pressure washer detergent has been used, run clean water through the system to eliminate detergent residue using the following procedure:
1. Turn off the Engine as detailed in step 2.
2. Remove the Nozzle and Detergent Siphon Tube and soak in a container of clean water.
3. Turn on the water supply and restart the Engine following directions in Starting the Engine.
4. Point Wand in safe direction and hold down Trigger to flush water through system until clean.
5. Turn off the Engine as detailed in step 2.

Storing

Disconnect the water supply hose from the water inlet connection on the Pump.
Drain all water out of the Pressure Washer and lock the Trigger. Clean external parts with clean cloth.
Disconnect the Pressure Hose from the Pump and Spray Gun, drain water from Hose and coil.

Loosen the nut and remove the Wand from the Spray Gun.
Cover and store in a dry, level, well-ventilated indoor area out of reach of children. Storage area should also be away from ignition sources, such as water heaters, clothes dryers, and furnaces.

NOTICE
Drain fuel at end of season or warranty is void.
See Long-Term Storage for complete storage instructions.

Maintenance

TO PREVENT SERIOUS INJURY FROM ACCIDENTAL STARTING:
Turn the Power Switch of the equipment to its "OFF" position, wait for the engine to cool, and disconnect the spark plug cap before performing any inspection, maintenance, or cleaning procedures.

TO PREVENT SERIOUS INJURY FROM EQUIPMENT FAILURE:
Do not use damaged equipment. If abnormal noise, vibration, or excess smoking occurs, have the problem corrected before further use.

Follow all service instructions in this manual. The engine may fail critically if not serviced properly.

Many maintenance procedures, including any not detailed in this manual, will need to be performed by a qualified technician for safety. If you have any doubts about your ability to safely service the equipment or engine, have a qualified technician service the equipment instead.

Cleaning, Maintenance, and Lubrication Schedule

Note: This maintenance schedule is intended solely as a general guide. If performance decreases or if equipment operates unusually, check systems immediately. The maintenance needs of each piece of equipment will differ depending on factors such as duty cycle, temperature, air quality, fuel quality, and other factors.

Note: The following procedures are in addition tothe regular checks and maintenance explained as part of the regular operation of the engine and equipment.

Procedure	Before Each Use	Monthly or every 20 hr. of use	Every 3 mo. or 50 hr. of use	Every 6 mo. or 100 hr. of use	Yearly or every 300 hr. of use	Every 2 Years
Brush off outside of engine
Check engine oil level
Check air cleaner
Check sediment cup
Change engine oil
Change pump oil
Clean/replace air filter			*
Check and clean spark plug
Check/adjust idle speed Check/adjust valve clearance Clean fuel tank, strainer and carburetor Clean carbon build-up from combustion chamber					**	**
Replace fuel line if necessary						**

*Service more frequently when used in dusty areas.
**These items should be serviced by a qualified technician.

Checking and Filling Fuel

Clean the Fuel Cap and the area around it.
Unscrew and remove the Fuel Cap.
Remove the Strainer and remove any dirt and debris. Then replace the Strainer.

Note: Do not use gasoline containing more than 10% ethanol (E10). Do not use E85 ethanol.

Note: Do not use gasoline that has been stored in a metal fuel container or a dirty fuel container. It can cause particles to enter the carburetor, affecting engine performance and/or causing damage.

If needed, fill the Fuel Tank to about 1 inch under the fill neck of the Fuel Tank with 87 octane or higher unleaded gasoline that has been treated with a fuel stabilizer additive. Follow fuel stabilizer manufacturer's recommendations for use.
Then replace the Fuel Cap.
Wipe up any spilled fuel and allow excess to evaporate before starting engine.
To prevent FIRE, do not start the engine while the smell of fuel hangs in the air.

Pump Maintenance

Change the Pressure Washer Pump oil after the first 50 hours of use and every 50 hours of use thereafter.

Refer to the Specifications chart for oil type and capacity. If any sign of oil leakage is present on or around the Pump, DO NOT operate the Pressure Washer. Have the unit serviced by a qualified technician.

Engine Oil Change

Oil is very hot during operation and can cause burns. Wait for engine to cool before changing oil.

Make sure the engine is stopped and is level.
Close the Fuel Valve.
Place a drain pan (not included) underneath the crankcase's drain plug.
Remove the drain plug and, if possible, tilt the crankcase slightly to help drain the oil out. Recycle used oil.
Replace the drain plug and tighten it.
Clean the top of the Dipstick and the area around it. Remove the Dipstick by turning it counterclockwise, and wipe it off with a clean, lint free rag.
Add the appropriate type of oil until the oil level is at the full level. SAE 10W-30 oil is recommended for general use.

The SAE Viscosity Grade chart shows other viscosities to use in different average temperatures.
Thread the dipstick back in clockwise.

NOTICE: Do not run the engine with too little oil. Engine will not start with low or no engine oil.

Spark Plug Maintenance

Disconnect spark plug cap from end of plug. Clean out debris from around spark plug.
Using a spark plug wrench, remove the spark plug.
Inspect the spark plug:
If the electrode is oily, clean it using a clean, dry rag.
If the electrode has deposits on it, polish it using emery paper. If the white insulator is cracked or chipped, the spark plug needs to be replaced.

Recommended Spark Plugs
NHSP / TORCH	F7TC

NOTICE: Using an incorrect spark plug may damage the engine.

When installing a new spark plug, adjust the plug's gap to the specification on the Specifications chart. Do not pry against the electrode, the spark plug can be damaged.
Install the new spark plug or the cleaned spark plug into the engine.

Gasket-style:
Finger-tighten until the gasket contacts the cylinder head, then tighten about 1/2-2/3 turn more.
Non-gasket-style:
Finger-tighten until the plug contacts the cylinder head, then tighten about 1/16 turn more.

NOTICE: Tighten the spark plug properly.
If loose, the spark plug will cause the engine to overheat.
If overtightened, the threads in the engine block will be damaged.

Apply dielectric spark plug boot protector (not included) to the end of the spark plug and reattach the wire securely.

Air Filter Maintenance

Remove the Air Cleaner Cover and the air filter(s) and check for dirt. Clean as described below.
Cleaning:

For paper filters:
To prevent injury from dust and debris, wear ANSI-approved safety goggles, NIOSH-approved dust mask/respirator, and heavy-duty work gloves. In a well-ventilated area away from bystanders, use pressurized air to blow dust out of the filter. If this does not get the filter clean, replace it.
For foam filters:
Wash the filter in warm water and mild detergent several times. Rinse. Squeeze out excess water and allow it to dry completely. Soak the filter in lightweight oil briefly, then squeeze out the excess oil.

Install the cleaned filter(s). Secure the Air Cleaner Cover before use.

Long-Term Storage

When the equipment is to remain idle for longer than 20 days, prepare the Engine for storage as follows:

CLEANING:
Wait for Engine to cool, then clean Engine with dry cloth. NOTICE: Do not clean using water. The water will gradually enter the Engine and cause rust damage. Apply a thin coat of rust preventive oil to all metal parts.
FUEL:
To protect the fuel tank during storage, fill the tank with gasoline that has been treated with a fuel stabilizer additive. Follow fuel stabilizer manufacturer's recommendations for use. Refer to Checking and Filling Fuel.

burn hazard
TO PREVENT SERIOUS INJURY FROM FIRE:
Fill tank in a well-ventilated area away from ignition sources. If the engine is hot from use, shut the engine off and wait for it to cool before adding fuel. Do not smoke.

LUBRICATION:
1. Change engine oil.
2. Clean out area around spark plug. Remove spark plug and pour one tablespoon of engine oil into cylinder through spark plug hole.
3. Replace spark plug, but leave spark plug cap disconnected.
4. Pull Starter Handle to distribute oil in cylinder. Stop after one or two revolutions when you feel the piston start the compression stroke (when you start to feel resistance).
PUMP PREPARATION:
1. Disconnect the Pressure Hose and water supply hose from the Pump.
2. Connect a short length of garden hose with a male hose connector on one end to the Pump's water inlet connection.
3. Use a funnel to add approximately six ounces of RV antifreeze to the Pump.
  NOTICE: Use only RV antifreeze.
  Other types of antifreeze are corrosive and can damage Pump.
4. With spark plug cap disconnected and Engine switch in OFF position, pull Starter Handle several times until antifreeze begins to come out of Pump outlet fitting.
5. Remove garden hose from Pump.
STORAGE AREA:
Cover and store in a dry, level, well-ventilated area out of reach of children. Storage area should also be away from ignition sources, such as water heaters, clothes dryers, and furnaces.
EVERY 3 MONTHS, TO PROTECT ENGINE AND WARRANTY COVERAGE:
1. Safely drain antifreeze, and dispose of properly.
2. Connect Pressure Hose and water supply hose.
3. Turn on water supply, remove nozzle, point wand in safe direction, and hold down trigger until all air is released from the system, at least 30 seconds. Then release the Trigger, lock it in the safety position and replace Nozzle before starting engine.
4. Discharge nozzle in safe direction and run engine for 15-20 minutes or the Warranty is VOID. Turn off engine.
5. Discharge nozzle in safe direction, and then disconnect hoses and drain water.
6. Connect a short length of garden hose with a male hose connector on one end to the Pump's water inlet connection.
7. Use a funnel to add approximately six ounces of RV antifreeze to the Pump.
  NOTICE: Use only RV antifreeze. Other types of antifreeze are corrosive and can damage Pump.
AFTER STORAGE:
1. Before starting the Engine during or after storage, keep in mind that untreated gasoline will deteriorate quickly. Drain the fuel tank and change to fresh fuel if untreated gasoline has been sitting for a month, if treated gasoline has been sitting beyond the fuel stabilizer's recommended time period, or if the Engine does not start.
2. With spark plug cap disconnected and

Engine switch in OFF position, pull Starter Handle several times to discharge antifreeze out of the Pump outlet fitting before using Pressure Washer.

Troubleshooting

Problem	Possible Causes	Probable Solutions
Engine will not start	FUEL RELATED: No fuel in tank or fuel valve closed. Choke not in START position, cold engine. Gasoline with more than 10% ethanol used.(E15, E20, E85, etc.) Low quality or deteriorated, old gasoline. Carburetor not primed. Dirty fuel passageways. Carburetor needle stuck. Fuel can be smelled in the air. Too much fuel in chamber. This can be caused by the carburetor needle sticking. Clogged Fuel Filter.	FUEL RELATED: Fill fuel tank with fresh 87+ octane unleaded stabilizer-treated gasoline and open fuel valve. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). Move Choke to START position. Clean out ethanol rich gasoline from fuel system. Replace components damaged by ethanol. Use fresh 87+ octane stabilizertreated unleaded gasoline only. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). Use fresh 87+ octane stabilizer-treated unleaded gasoline. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). Pull on Starter Handle to prime. Clean out passageways using fuel additive. Heavy deposits may require further cleaning. Gently tap side of carburetor float chamber with screwdriver handle. Turn Choke to RUN position. Remove spark plug and pull the start handle several times to air out the chamber. Reinstall spark plug and set Choke to START position. Replace Fuel Filter.
	IGNITION (SPARK) RELATED: Spark plug cap not connected securely. Spark plug electrode wet or dirty. Incorrect spark plug gap. Spark plug cap broken. Incorrect spark timing or faulty ignition system.	IGNITION (SPARK) RELATED: Connect spark plug cap properly. Clean spark plug. Correct spark plug gap. Replace spark plug cap. Have qualified technician diagnose/ repair ignition system.
	COMPRESSION RELATED: Cylinder not lubricated. Problem after long storage periods. Loose or broken spark plug. (Hissing noise will occur when trying to start.) Loose cylinder head or damaged head gasket. (Hissing noise will occur when trying to start.) Engine valves or tappets mis-adjusted or stuck.	COMPRESSION RELATED: Pour tablespoon of oil into spark plug hole. Crank engine a few times and try to start again. Tighten spark plug. If that does not work, replace spark plug. If problem persists, may have head gasket problem, see #3. Tighten head. If that does not remedy problem, replace head gasket. Have qualified technician adjust/ repair valves and tappets.
	ENGINE OIL RELATED: Low engine oil. Engine mounted on slope, triggering low oil shutdown.	ENGINE OIL RELATED: Fill engine oil to proper level. Check engine oil before EVERY use. Operate engine on level surface. Check engine oil level.
	PUMP RELATED: Pressure buildup in Pump.	PUMP RELATED: Pull Trigger to release pressure in Pump. Turn Pressure Regulator counterclockwise to lowest setting to reduce pressure in system.
Engine misfires	Spark plug cap loose. Incorrect spark plug gap or damaged spark plug. Defective spark plug cap. Old or low quality gasoline. Incorrect compression.	Check wire connections. Re-gap or replace spark plug. Replace spark plug cap. Use only fresh 87+ octane stabilizer-treated unleaded gasoline. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). Diagnose and repair compression. (Use Engine will not start: COMPRESSION RELATED section.)
Engine stops suddenly	Fuel tank empty or full of impure or low quality gasoline. Low oil shutdown. Defective fuel tank cap creating vacuum, preventing proper fuel flow. Faulty magneto. Disconnected or improperly connected spark plug cap.	Fill fuel tank with fresh 87+ octane stabilizertreated unleaded gasoline. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). Fill engine oil to proper level. Check engine oil before EVERY use. Test/replace fuel tank cap. Have qualified technician service magneto. Secure spark plug cap.
Engine stops when under heavy load	Dirty air filter Engine running cold.	Clean or replace element. Allow engine to warm up prior to operating equipment.
Engine knocks	Old or low quality gasoline. Engine overloaded. Incorrect spark timing, deposit buildup, worn engine, or other mechanical problems.	Fill fuel tank with fresh 87+ octane stabilizertreated unleaded gasoline. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). Do not exceed equipment's load rating. Have qualified technician diagnose and service engine.
Engine backfires	Impure or low quality gasoline. Engine too cold. Intake valve stuck or overheated engine. Incorrect timing.	Fill fuel tank with fresh 87+ octane stabilizertreated unleaded gasoline. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). Use cold weather fuel and oil additives to prevent backfiring. Have qualified technician diagnose and service engine. Check engine timing.
Does not produce high pressure	Diameter of water supply hose too small Water supply is restricted. Not enough water supply.	Replace hose with a 3/4-inch hose. Check water supply hose for kinks, leaks, or blockage. Open water faucet all the way.
Output pressure varies	Not enough water supply. Water inlet screen is clogged. Nozzle is clogged. Nozzle has mineral build up.	Check water supply hose for kinks, leaks, or blockage. Open faucet all the way. Remove inlet screen and rinse out. Remove Nozzle and clean. Remove Nozzle and clean with vinegar.
No intake of detergent	Detergent hose not properly inserted into unit. Tube cracked or split. Wrong Nozzle. Injector turned off. Injection tube strainer clogged. Nozzle blocked. Dried detergent in injector.	Push firmly into injector. Replace tube. Switch to Black Nozzle. Turn collar counterclockwise. Clean strainer. Clean Nozzle. Dissolve by running warm water through the injection tube. Run clean water through injector until clear.

warning Follow all safety precautions whenever diagnosing or servicing the equipment or engine.

Visit our website at: http://www.harborfreight.com
Email our technical support at: productsupport@harborfreight.com
Email our engine support at predator@harborfreight.com

For equipment technical questions, please call 1-888-866-5797.

Copyright © 2018 by Harbor Freight Tools. All rights reserved. No portion of this manual or any artwork contained herein may be reproduced in any shape or form without the express written consent of Harbor Freight Tools.
Diagrams within this manual may not be drawn proportionally. Due to continuing improvements, actual product may differ slightly from the product described herein.
Tools required for assembly and service may not be included.