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 M15781120F 

 
 
 
 
 

 

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.  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. 

Equipment Protection Quick Facts 

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 

Call NorthStar Product Support 1-800-270-0810

 

ITEM NUMBER:  15781120, 15775440, 

15781720, 15781820  

SERIAL NUMBER: _____________ 

 

Summary of Contents for 15775440

Page 1: ...quids 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 Equipment Protection Quick Facts Inspect Upon Delivery FIRST Inspect for missing or damaged components See Initial Set Up section for where to repor...

Page 2: ...reparing for Operation 15 Check Add Oil to Pump 15 Check Add Engine Oil 15 Inspect Fuel System Check for Leaks 16 Connect Hoses Water Supply and Spray Nozzle 17 Prime the Water Supply 18 Set Up for Chemical Spray if desired 19 Start Up Procedures 20 Start the Engine to Power the Pump 20 Apply Cleaning Chemical If Desired 20 Begin High Pressure Spray 20 Shutdown 21 STORAGE 22 Between Use Storage 22...

Page 3: ...TS EXPLOSION MODEL 15781120 15775440 15781720 15781820 REV F 28 PARTS LIST MODEL 15781120 15775440 15781720 15781820 REV F 29 PUMP ASSEMBLIES 30 PUMP EXPLODED VIEW AXD2530G GH E 31 PUMP EXPLODED VIEW AXD2530G GH E 32 PUMP EXPLODED VIEW 4DNX 33 PUMP EXPLODED VIEW 4SPX 34 LIMITED WARRANTY 36 ...

Page 4: ... safety apparel includes waterproof insulated gloves and non slip protective footwear Cleaning chemicals may require the use of respiration mask refer to chemical label for further instruction Adult control only Only trained adults should set up and operate the pressure washer Do not let children operate Under The Influence Never operate or let anyone else operate the pressure washer while fatigue...

Page 5: ...etic Oil 15W50 Pump Oil Shipped with Oil but refills required Universal Tractor Transmission Oil part COCP2101 or Mobil 1 Synthetic Oil 15W50 15781720 15781820 FLOW OUTPUT FLOW OUTPUT PSI bar 3000 207 PSI bar 3300 227 GPM I min 2 5 9 4 GPM I min 3 0 11 3 Max Water Temp 140 F 60 C Max Water Temp 140 F 60 C ENGINE ENGINE Engine Honda GX 160 Engine Honda GX 270 Horsepower 5 5 Horsepower 9 DIMENSIONS ...

Page 6: ...lacement 6 Engine Honda engine provides years of reliable use Air cooled engine that powers the pump 7 Hose Hook Store hose on hook Position depends on model see Assembly Instructions section 8 Nozzles Change nozzles for different spray patterns 9 Nozzle Holder Removable device that will clip on your belt and stores nozzles 10 Spray Gun Always use two hands for safe operation 11 Trigger Actuate to...

Page 7: ...uation which if not avoided will result in death or serious injury WARNING orange indicates a hazardous situation which if not avoided could result in death or serious injury CAUTION yellow used with the safety alert symbol indicates a hazardous situation which if not avoided could result in minor or moderate injury CAUTION yellow without the safety alert symbol is used to address practices not re...

Page 8: ... 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 1 788937 Poisonous Gas Decal 2 788936 Burn Hazard Decal Only on Model 15775440 3 788935 Fuel Fire Explosion Hazard 4 789002 Warning Decal 5 788796 Operation Instruction ...

Page 9: ...9 Safety Decals To order replacement safety labels call NorthStar Product Support at 1 800 270 0810 ...

Page 10: ...ng components contact Product Support at 1 800 270 0810 For damaged components contact the freight company that delivered the unit and file a claim If complete fill out product serial number information See Limited Warranty section of this manual Any Questions Comments Problems or Parts Orders call NorthStar Product Support at 1 800 270 0810 Engine Pump Base Assembly Handle Pressure Hose Lance Spr...

Page 11: ...OSE HOOK QTY 1 PART 779761 MODEL 15775440 QTY 1 VENTED FILL CAP QTY 1 PART CO3200013800 MODEL 15781120 15775440 NYLOCK NUT QTY 2 PART 777495 NOZZLE HOLDER QTY 1 PART 788696 NOZZLES QTY 5 Model 15781120 15775440 15781720 PART 38531 Model 15781820 PART 38532 Hardware Bag ...

Page 12: ...ver Follow the instructions below for safely moving the pressure washer Outdoor Use Only Select a suitable outdoor location 1 Never run the pressure washer in an enclosed or partially enclosed location such as a building garage barn shed or house These spaces can trap poisonous gases Running a fan or opening windows will not provide adequate ventilation to prevent dangerous CO build up 2 Only use ...

Page 13: ...sible fire Exhaust WARNING Exhaust Modification hazard Never attempt to attach ductwork to the muffler system to allow for installation inside an enclosure This could cause heat build up and increased exhaust back pressure resulting in possible exhaust leakage or damage to the pressure washer 1 The exhaust gas from your pressure washer is extremely hot and can cause combustible materials to catch ...

Page 14: ...t up and operation Do not allow anyone to operate the pressure washer who has not read the Owner s Manual and been instructed on its safe use Adult control only Only trained adults should set up and operate the pressure washer Do not let children operate Pressure washers can generate forces greater than children can control and require judgment beyond what can be expected of children Under the inf...

Page 15: ...e If spraying pressure washer specific chemicals wear a respirator mask to avoid inhalation of vapors if directed on the chemical label 2 Wear non slip protective footwear Use of pressure washer can create puddles and slippery surfaces Wear footwear capable of maintaining a good grip on wet surfaces Preparing for Operation Make sure that any regular maintenance has been performed as prescribed in ...

Page 16: ...ed rags are flammable and should be disposed of properly If fuel is spilled on your skin or clothes change clothes and wash skin immediately Fill Engine Fuel Tank Check the gasoline tank level If needed fill tank with fresh unleaded gasoline from a portable container 1 Remove engine gas cap 2 Add gasoline through the fill opening Use only a UL approved portable gasoline container to transfer the g...

Page 17: ...o fill a 5 gallon bucket with your garden hose The bucket must fill faster than the times listed in the table below Model Time to fill 5 gallon bucket 15775440 100 seconds 15781120 100 seconds 15781720 100 seconds 15781820 84 seconds 3 The water supply garden hose must have an inside diameter of at least 5 8 If the hose is more than 100 ft long the diameter must be at least 3 4 4 Never use a reser...

Page 18: ... 3 Release the collar making sure it springs back and re seats to its original non retracted position Check the connection by pulling on the nozzle to ensure a tight connection if correctly inserted nozzle will rotate but not pull out Prime the Water Supply Turn on water supply and squeeze the trigger CAUTION Water Pressure Never run the pump without the water supply connected and turned on Operat...

Page 19: ...emicals Containing Muriatic Acid Certain chemicals such as bleach or those containing muriatic acid will cause pump damage if introduced upstream through the pump s water inlet WARNING Chemical Spraying Never spray acids corrosives or abrasive or flammable liquids Breathing hazards surface burns corrosion or fire explosion could result Follow the chemical manufacturer s label instructions for prop...

Page 20: ...from people Never direct discharge stream at or near any person Do not allow any part of the body to come in contact with the fluid stream High pressure spray can cause serious skin eye or falling injuries Injection injury will occur if high pressure spray pierces the skin injecting liquid under the skin Injection injury can result in blood poisoning and or severe tissue damage leading to infectio...

Page 21: ...e locked position to guard against accidental trigger release Spray Gun Safety Lock When not spraying use the spray gun safety lock to prevent accidental high pressure discharge 10 Always turn off the engine and activate spray gun trigger to relieve system pressure when the sprayer is unattended disconnecting hoses installing cleaning nozzles or servicing the pump WARNING Injury Always turn off th...

Page 22: ...peratures you must properly prepare the pressure washer to prevent water from freezing in the system WARNING Freezing Conditions Do not allow water to freeze in the pressure washer high pressure hose or spray gun Freezing water can cause damage to the equipment and cause the spray gun to fail in the open position A spray gun that has failed in the open position can whip around and cause personal i...

Page 23: ...dd one teaspoon oil through spark plug hole c Place rag over spark plug hole and slowly pull the recoil a few times to lubricate the combustion chamber Replace spark plug but do not reconnect the spark plug wire Prepare Pressure Washer for Storage Prepare the pressure washer for storage 1 Make sure the engine start switch is OFF 2 Disconnect the engine spark plug wire if you haven t already done s...

Page 24: ...ssure washer Turn off relieve pressure first Always turn off pressure washer and relieve system pressure before inspection or maintenance Remove spark plug or spark plug wire to prevent accidental starting Fuel valve off Turn fuel shut off valve to OFF position before transporting or servicing the pressure washer Replace guards Make sure all guards and cover shields are replaced after servicing th...

Page 25: ...per local state and national guidelines 1 Unscrew garden hose from water inlet if connected 2 Unscrew inlet filter 3 Remove filter screen 4 Run water through filter screen to clean 5 Reassemble Inspect Fuel System Inspect the engine fuel system and check for leaks before each use Do not start pressure washer until all needed repairs have been completed WARNING Filter Disposal Gasoline fuel is high...

Page 26: ...ll designed will need maintenance and repairs A NorthStar pressure washer is no exception At times a NorthStar pressure washer may become inoperable because repairs are required NorthStar Product Support will assist in these repairs as needed but if an inoperable pressure washer creates a major expense to your business then we strongly recommend the following Have a staff person become familiar wi...

Page 27: ... Place ON OFF switch in the ON position Spark plug wire not attached Attach spark plug wire to spark plug LOW SURGING PRESSURE Causes Solutions Insufficient water supply Increase water flow Check for kinked or pinched hose Plugged inlet screen Pull out and clean screen carefully Need to use high pressure nozzle Change to the green yellow white or red nozzle Plugged nozzle Remove nozzle check for b...

Page 28: ...28 Parts Explosion Model 15781120 15775440 15781720 15781820 Rev F ...

Page 29: ...5781120 15781720 15781820 13 22622 Lance w Quick Connect 1 15781120 15781720 15781820 14 779165 Spray Gun 1 15781120 15781720 15781820 38527 15775440 15 779166 Lance 1 ALL 16 777904 Nozzle Quick Coupler 1 ALL 17 38531 Nozzle 5 Pack 3 0 1 15781120 15781720 15775440 38532 Nozzle 5 Pack 3 5 15781820 18 221222 Chemical Strainer 1 ALL 19 777165 Braided Chemical Hose 3 ft ALL 20 2215 Rubber Foot 2 ALL 2...

Page 30: ...75440 38596 3 8 Inlet Filter 15781720 15781820 29 777340 x Hose Barb Fitting 1 15781720 15781820 30 777834 Hose Clamp 2 15781720 15781820 31 777165 PVC Hose sold by foot 1 ft 15781720 1ft 2 in 15781820 32 38584 Easy Start Valve 1 15781720 15781820 33 777347 3 8 Street Tee 1 15781720 15781820 34 35918 Thermal Valve 1 15781720 15781820 35 22393 Pop Off Valve 1 15781820 44 777410 3 8 Street elbow 1 1...

Page 31: ...31 Pump Exploded View AXD2530G GH E ...

Page 32: ...0051100 GARDEN HOSE TAIL W WING NUT 1 17 CO0009036900 RING 3 55 SEE PART 58 CHEM COUPLING 1 18 CO0009021900 RING RETAINER WOBBLE PUMP 3 56 CO3003002400 BALL FOR CHEMICAL INJECTOR 1 19 CO1210035600 O RING SEAL CONTAINER WOBBLE 3 57 CO1802018000 SPRING FOR CHEMICAL INJECTOR 1 20 CO1241005700 BACK PACKING 3 58 CO2803043500 CHEMICAL INJECTOR KIT 1 21 CO0601030800 OIL SEAL SPACER 3 59 CO3200001700 PORT...

Page 33: ... Oil w Gasket 1 168 CA543988 Retainer Spring Inlet 3 38 CA44428 Gasket Flat Flex Oil Gauge 1 169 Kit 2 Retainer Spring Discharge 3 48 CA44842 Drain Plug 1 172 CA142807 O Ring for Plug 3 49 CA14179 O Ring for Drain Plug 1 174 CA547104 Plug Valve w o ring 3 53 Not Available Crankcase 1 185 Not Available Head Manifold w Unloader Body 1 64 CA46229 Crosshead Pin 3 188 Not Available Screw 6 65 CA542402 ...

Page 34: ...34 Pump Exploded View 4SPX ...

Page 35: ...6 CA49664 Seat 1 69 CA126259 437 CA13963 O Ring 70D for Seat 1 70 CA25301 Oil Seal 3 438 CA46254 Seat Check Valve 1 90 CA547091 Plunger 3 439 CA13963 O Ring 70D for Check Valve Seat 1 98 CA46730 Washer 3 443 CA547826 Valve Check 1 99 CA542405 Retainer Plunger 3 444 CA45924 Spring 1 100 CA44869 Retainer Seal 3 446 CA26133 O Ring 70D for Body 1 106 CA45188 Seal 3 469 CA7332 Chemical Fixed Injector 1...

Page 36: ...lteration or improper installation or operations will void warranty Determining whether a part is to be replaced or repaired is the sole decision of NorthStar NorthStar will not provide for replacement of complete products due to defective parts Any costs incurred due to replacement or repair of items outside of a NorthStar approved facility is the responsibility of the buyer and not covered under...

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Page 38: ...38 Assembled by Northern Tool Equipment Company Inc Burnsville MN 55306 NorthernTool com ...

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