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Pressure Washer:
Instructions for Installation/Set-up, Operation, Maintenance, & Storage
This pressure washer produces cold water high pressure spray. Cleaning chemicals may be incorporated into the
spray if desired. The pressure pump for this equipment is powered by a gasoline internal combustion engine.
WARNING: SPECIAL HAZARDS
 CO Poisoning: Exhaust from engine contains carbon monoxide, a poisonous gas that can cause carbon monoxide
poisoning and possible death if inhaled. ONLY run pressure washer OUTDOORS and at least 20 feet from the home, away
from windows, vents and air intakes, to allow proper ventilation. If you start to feel sick, dizzy, or weak while using the
pressure washer, shut off the engine and get to fresh air RIGHT AWAY.
 Injection Injury: High-pressure spray can pierce skin and underlying tissues, leading to serious injury and possible
amputation. Such an injection injury can result in blood poisoning and/or severe tissue damage.
 Flying Debris: High-pressure spray can cause flying debris and possible surface damage.
 Electric shock: Operating equipment in wet conditions or near water can cause electric shock.
 Chemical Exposure: Cleaning chemical vapors or contact with skin may be hazardous.
 Fire/Explosion: Engine sparking can ignite fuel or other flammable liquids or vapors in the vicinity. Hot exhaust from engine
can ignite combustible materials.
 Burns: Pressure Washer pump and engine are hot surfaces that can cause burn injuries.
Detailed safety information about these hazards appears throughout this manual.
Inspect Upon Delivery: FIRST! Inspect for missing or damaged components. See "Initial Set-Up" section for where
to report missing or damaged parts.
Add Engine Oil: Engine is shipped without oil. See engine manual for instructions on capacity and viscosity
recommendations.
Replace Temporary Pump Oil Plug: Pump is shipped with oil but with temporary shipping plug. Check pump oil
level before starting and replace temporary shipping plug with permanent vented oil fill plug provided within plastic
bag containing this Owners's Manual.
Water Flow Requirements: Make sure your supply water flow rate is 20% higher than the pressure washer's flow
rate (see "Operations", section for detail), and that your water is clean and particle free.
Chemical Spraying: Use only approved pressure washer chemicals designed for high-pressure use.
Storage: Do not allow water to freeze in the pump, hose, or spray gun(s). See "Storage" for more information.
Maintenance Schedule: Engine and pump require periodic inspection and servicing to keep pressure washer
functioning efficiently. See "Maintenance Schedule Summary" for frequency of servicing.
Any Questions, Comments, Problems, or Parts Orders
Owner's Manual
Machine that cleans dirty surfaces with
high pressure water.

Equipment Protection Quick Facts

Call NorthStar Product Support 1-800-270-0810
M15781120F
ITEM NUMBER: 15781120, 15775440,
15781720, 15781820
SERIAL NUMBER: _____________

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Summary of Contents for NorthStar M15781120F

  • Page 1: Equipment Protection Quick Facts

    M15781120F ITEM NUMBER: 15781120, 15775440, 15781720, 15781820 SERIAL NUMBER: _____________ Owner’s Manual Pressure Washer: Machine that cleans dirty surfaces with high pressure water. Instructions for Installation/Set-up, Operation, Maintenance, & Storage This pressure washer produces cold water high pressure spray. Cleaning chemicals may be incorporated into the spray if desired.
  • Page 2: Table Of Contents

    Table of Contents Equipment Protection Quick Facts ............................1 TABLE OF CONTENTS ..............................2 ABOUT YOUR PRESSURE WASHER ......................... 4 SPECIFICATIONS ................................ 5 COMPONENT IDENTIFICATION ..........................6 SAFETY ..................................7 Hazard Signal Word Definitions ............................7 SAFETY LABELING ..............................8 Safety Decal Locations .................................
  • Page 3 Clean Inlet Filter .................................. 25 Check Tire Pressure ................................25 Change Pump Oil ................................26 TROUBLESHOOTING ..............................27 PARTS EXPLOSION- MODEL #15781120, 15775440, 15781720, 15781820-REV F ..........28 PARTS LIST - MODEL #15781120, 15775440, 15781720, 15781820 - REV F ............29 PUMP ASSEMBLIES ..............................
  • Page 4: About Your Pressure Washer

    About Your Pressure Washer Thank you for purchasing a NorthStar Pressure Washer! Site Location. Intended for outdoor use only. It is designed for long life, dependability, and top Personal Protection. Wear safety apparel during performance. operation, including safety glasses with side and top Intended Use.
  • Page 5: Specifications

    Specifications 15781120 15775440 FLOW OUTPUT FLOW OUTPUT PSI (bar) 3000 (207) PSI (bar) 3000(207) 2.5 (9.4) 2.5 (9.4) GPM (I/min) GPM (I/min) 140° F (60°C) 140°F (60°C) Max Water Temp Max Water Temp ENGINE ENGINE Engine Honda GX 160 Engine Honda GC 190 190 cc Horsepower...
  • Page 6: Component Identification

    Component Identification Handle: Designed for easy cart movement. Gun Hook: Store spray gun on hook. Pressure Hose: Attach quick couplers to gun and water outlet. Chemical Hose: Submerge in cleaning solution. Water Pump: Inspect for loose/broken parts prior to each use. A device that moves fluid through a combination of suction and displacement.
  • Page 7: Safety

    Safety Hazard Signal Word 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. DANGER (red) indicates a hazardous situation, which if DANGER not avoided, will result in death or serious injury.
  • Page 8: Safety Labeling

    Safety Labeling Safety Decal Locations WARNING: ALWAYS make sure safety labels are in place and in good condition. If a safety label is missing or not legible, order new labels from NorthStar Product Support at 1-800-270-0810. On-Product Warning Labels Location Part numbers Description Poisonous Gas Decal...
  • Page 9 Safety Decals To order replacement safety labels, call NorthStar Product Support at 1-800-270-0810.
  • Page 10: Initial Set-Up

    Initial Set-Up Step 1. Inspect & Unpack Upon receiving your item check for missing or damaged parts. See “Component Identification” section of this manual for a diagram of the pressure washer and its components. For missing components, contact Product Support at 1-800-270-0810. ...
  • Page 11: Hardware Bag

    Hardware Bag NOZZLES QTY 5 (Model# 15781120, 15775440, 15781720) PART# 38531 (Model# 15781820) PART# 38532 NOZZLE HOLDER QTY 1 PART# 788696 NYLOCK NUT VENTED FILL CAP QTY 2 QTY 1 PART# 777495 PART# CO3200013800 MODEL# 15781120, 15775440 CARRIAGE BOLT QTY 2 PART# 82233 HOSE HOOK *QTY 1...
  • Page 12: Step 2. Assembly

    Step 2. Assembly Step 3. Select Suitable Location Note: Remove contents from packaging to begin Moving and Handling assembly. Moving your pressure washer around Handle Assembly  Use the handles to manually move the pressure 1.) Attach handle to base using: washer.
  • Page 13: Install Spark Arrestor (If Required)

    inside RVs or other vehicles, on boats, or on 1. The exhaust gas from your pressure washer is pick-up truck beds. extremely hot and can cause combustible materials to catch on fire. 2. Make sure the engine is at least 7 feet from all 7.
  • Page 14: Operation

    Operation Follow Safety Rules for Operation set-up and operation. Do not allow anyone to operate the pressure washer who has not read the Owner's After you have checked and fueled the equipment Manual and been instructed on its safe use. and positioned it in a suitable worksite, it is time to Adult control only.
  • Page 15: Preparing For Operation

    Preparing for Operation Never pull by hose. Do not move this machine by pulling on the hose. Hose or connections could fail and Make sure that any regular maintenance has been result in catastrophic high pressure release of fluid as performed as prescribed in “Maintenance &...
  • Page 16: Inspect Fuel System/Check For Leaks

    Always follow these general safety rules when - Do NOT overfill the gasoline tank. Allow at least fueling: 1/2" of empty space below the fill neck to allow for 1) Turn pressure washer off and allow to cool for at fuel expansion.
  • Page 17: Connect Hoses, Water Supply, And Spray Nozzle

    3.) The water supply garden hose must have an inside inject fluid into the body. Injection injury can result in blood poisoning and/or severe tissue damage leading diameter of at least 5/8”. If the hose is more than to infection, gangrene, and possibly amputation. 100 ft.
  • Page 18: Prime The Water Supply

    Select Nozzle for Spray Gun 3. Release the collar, making sure it springs back and re-seats to its original (non-retracted) position. Your pressure washer is equipped with four high- Check the connection by pulling on the nozzle to pressure nozzles and one low-pressure nozzle. ensure a tight connection -- if correctly inserted, Generally, the wider the spray angle of the nozzle, the nozzle will rotate but not pull out.
  • Page 19: Set Up For Chemical Spray (If Desired)

    Set Up for Chemical Spray (if desired) Acquire Cleaning Chemical Prepare for Chemical Spray (if planning to Use only approved pressure washer chemicals or chemicals specifically formulated for use with pressure use) washers. Using the proper cleaning chemical for the application CAUTION: Non-approved Chemicals can speed up cleaning jobs tremendously.
  • Page 20: Start-Up Procedures

    Begin High Pressure Spray Start-Up Procedures Start the Engine to Power the Pump. WARNING: High Pressure Spraying Safety 1. Make sure water supply is connected and primed.  Keep spray away from people. Never direct CAUTION: Warranty Void discharge stream at or near any person. Do not Running the pump dry will cause damage and void allow any part of the body to come in contact with the warranty.
  • Page 21: Shutdown

    4. Wash from the bottom to the top, using side-to- 10. Always turn off the engine and activate spray gun side motions. This washes away heavy dirt and trigger to relieve system pressure when: allows the detergent to soak as you work toward the sprayer is unattended ...
  • Page 22: Storage

    Storage When you are finished using the pressure washer, you 1. Drain the water from the high pressure hose and must prepare the sprayer for storage and store it in a spray gun by depressing the trigger on the spray proper location.
  • Page 23: Prepare Pressure Washer For Storage

     Add fuel stabilizer to the gasoline (following manufacturer's instructions) Fuel stabilizer steps: a. Ensure gas tank is full. b. Add fuel stabilizer to fuel tank. c. Run pressure washer with high pressure hose at least 5 minutes after adding stabilizer to allow it to enter the fuel system.
  • Page 24: Maintenance & Repair

    Maintenance & Repair WARNING: Maintenance Hazards ALWAYS shut off water supply, bleed water pressure, turn off engine and disconnect the spark plug wire before cleaning, adjusting, or servicing the pressure washer. After servicing, make sure all guards and cover shields are replaced before using. Maintenance Schedule Summary Item Frequency...
  • Page 25: Clean Inlet Filter

    WARNING: High Pressure Fluid Injection Hazard High pressure fluid discharge from leaks (even pin-sized) or ruptured components can pierce skin and inject fluid into the body. Injection injury can result in blood poisoning and/or severe tissue damage leading to infection, gangrene, and possibly amputation.
  • Page 26: Change Pump Oil

    Change Pump Oil IMPORTANT: Replacement Parts Change the pump oil after the first 50 hours of use, If a part needs replacement, only use parts that and then after every 3 months or 500 hours of use after meet the manufacturer's part number that.
  • Page 27: Troubleshooting

    Troubleshooting This section provides a list of the more frequently encountered pressure washer malfunctions, their causes and corrective actions. Some corrective actions can be performed by the operator or maintenance personnel, and others may require assistance of a qualified Service Center. ENGINE WILL NOT START Causes Solutions...
  • Page 28: Parts Explosion- Model #15781120, 15775440, 15781720, 15781820-Rev F

    Parts Explosion- Model #15781120, 15775440, 15781720, 15781820-Rev F...
  • Page 29: Parts List - Model #15781120, 15775440, 15781720, 15781820 - Rev F

    Parts List - Model #15781120, 15775440, 15781720, 15781820 - Rev F REF# PART# DESCRIPTION MODEL 788696 Nozzle Holder 788685 15775440 Handle 15781120, 15781720, 788542 15781820 789207 Decal, Billboard 38578 Knob 788631 15775440 Base 15781120, 15781720, 788537 15781820 788813 Wheel 305200 Wheel Retainer 777915 Hose Quick Couple Nipple...
  • Page 30: Pump Assemblies

    Pump Assemblies Ref# Part# Description Model 777915 Quick Connect Outlet Plug, F 15781720, 15781820 777913 Quick Connect Outlet Plug, M 15781120, 15775440 4027 Inlet Filter Washer 15781120, 15775440 38596 3/8” Inlet Filter 15781720,15781820 777340 ¼” x ¼” Hose Barb Fitting 15781720,15781820 15781720, 15781820 777834...
  • Page 31: Pump Exploded View - Axd2530G Gh E

    Pump Exploded View – AXD2530G GH E...
  • Page 32: Pump Exploded View - Axd2530G Gh E

    Pump Exploded View – AXD2530G GH E Part # Description Ref # Part # Description Ref # CO3202001800 CO3200001700 PORT PLUG, AXD COMET PUMP PISTON CHECK VALVE KIT,AXD CO3609001400 SCREW, M8 X 55 CO2409009100 NOT AVAILABLE MANIFOLD CO1210046000 O-RING CO3202001800 CO2409008600 CHECK VALVE O-RING,OIL PLUG - WOBBLE...
  • Page 33: Pump Exploded View - 4Dnx

    Pump Exploded View – 4DNX Ref# DESCRIPTION Ref# DESCRIPTION Not Available Screw Kit #1 Seal CA547153 Bearing Cover Not Available Seal Case CA14041 O-Ring, Bearing Cover CA13976 O-Ring for Seal Case CA55337 Oil Seal Kit #1 Seal CA14488 Inner Ball Bearing CA17428 O-Ring, Inlet CA547048...
  • Page 34: Pump Exploded View - 4Spx

    Pump Exploded View – 4SPX...
  • Page 35 Ref# DESCRIPTION Ref# DESCRIPTION Not Available Screw Not Available Screw CA547084 Bearing Cover CA31643 Adapter Mount Assembly CA14041 O-Ring, Bearing Cover CA547797 Handle, Adjusting CA125351 Oil Seal CA547798 Adjusting Cap Not Available Inner Ball Bearing CA548671 Lock Nut CA547020 Connecting Rod CA548675 Screw, Set Not Available...
  • Page 36: Limited Warranty

    Limited Warranty Dear Valued Customer: The NorthStar Product you just purchased is built with the finest material and craftsmanship. Use this product properly and enjoy the benefits from its high performance. By purchasing a NorthStar product, you show a desire for quality and durability. Like all mechanical equipment this unit requires a due amount of care.
  • Page 37 This page was intentionally left blank.
  • Page 38 Assembled by Northern Tool & Equipment Company, Inc. Burnsville, MN 55306 NorthernTool.com...

This manual is also suitable for:

M15781120bM15781120e.415781120157754401578172015781820

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