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M157304E 

157303 & 157304 Manual

 

 

 

Installation, Operation, and Maintenance Manual

 

 

PRESSURE WASHER

Cleans dirty surfaces with high pressure water.

 

 

To the Owner: 

Thank you for purchasing a Northstar pressure washer.  Your machine is designed for long life, dependability, 
and the top performance you demand!  Take time now to read through this manual so you better understand the 
machine’s operation, maintenance and safety precautions.  Everyone who operates this machine must read and 
understand this manual.  The time you take now will prolong your machine’s life and prepare you for its safe 
operation.  Enjoy the exceptional performance of your Northstar pressure washer, the industry leader! The 
manufacturer reserves the right to make improvements in design and/or changes in specifications at any time 
without incurring any obligation to install them on units previously sold. 

 

Quick Facts 

Pump Oil 

Pump is shipped with oil.  Change oil plug and check pump oil level before starting. 
Use SAE 30 Non-detergent pump oil (item# 4043) or Cat Pump oil (item# 22158) for oil 
changes. 

Water 

Make sure your water flow is 20% higher than the pressure washer’s flow rate.   
Make sure your water is clean and particle free. 

Storage 

Do not allow water to freeze in the pump, hose, or spray gun. 

Spraying 
Chemicals 

Use any North Star brand or equivalent pressure washer chemicals.   
Adjust soap adjustment knob to regulate cleaning power. 

Maintenance 
Schedule 

Pump: 

Oil: change after first 50 hours, then every 3 months or 500 hours. 

Read and understand all manuals before operating.

 

 
 
 
 

Any Questions, Comments, Problems or Parts Orders

 

In the United States

 

In the United Kingdom

 

Northstar Customer Service

 

Call  02392639752

 

Call 1-800-270-0810

 

Northern Tool and Equipment Co. (UK) Ltd.

 

Hours: Monday - Friday 7:00 AM to 5:30 PM

 

Unit 2, Keel Close,

 

Saturday 7:30 AM-11:30 AM Central Time

 

Portsmouth, Hants PO3 5QD, England

 

 

   

ITEM NUMBER:    

 

  

 

SERIAL NUMBER:

 

 

 

HP:______  Volts:______  Amp:______  Ph:_____ 

 

RPM:____ PSI:____ GPM:____ Nozzle Size:_____ 

 

Pump:___________  Hose:______  Lance:_______ 

 

Max. Discharge Temperature:_____________

 

 

 

Summary of Contents for 157303

Page 1: ...and check pump oil level before starting Use SAE 30 Non detergent pump oil item 4043 or Cat Pump oil item 22158 for oil changes Water Make sure your water flow is 20 higher than the pressure washer s...

Page 2: ...ine without sufficient lubrication or sufficient water to cool the pump 9 Wear safety glasses gloves face protection and appropriate clothing when operating the machine 10 Do not operate this machine...

Page 3: ...3 Machine Component Identification 157303 157304 Ref Description Ref Description 1 Inlet Filter 4 Pump 2 On Off Switch 5 Unloader 3 High Pressure Outlet 6 Motor fig02288...

Page 4: ...4 Installation Instructions I Unpack Separate and identify all components Use the assembly instructions in this manual for assembly...

Page 5: ...5 HARDWARE BAG Separate and identify all components Use the assembly instructions in this manual for assembly...

Page 6: ...for 157304 Install on quick connect outlet on 157303 4 Connect the other end of the pressure hose to the spray gun as shown 5 Connect the lance extension to the spray gun and insert the proper nozzle...

Page 7: ...A 157304 is shown in the following steps the 157303 gets wired the exact same way Step 1 Using a 3 8 wrench remove the roof and the top of the electrical housing Front panel not shown for clairity Ste...

Page 8: ...nds or faster C 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 D Never use a reservoir tank as a water...

Page 9: ...pressure washer chemicals or chemicals specifically formulated for pressure washers Follow the chemical manufacturer s recommendations Understand all safety precautions and first aid for all chemicals...

Page 10: ...all preventative maintenance procedures as outlined in the provided manuals 2 Keep a stock of recommended service parts for maintenance and minor repairs Recommended Service Parts List Following is a...

Page 11: ...move it outdoors before starting the motor Follow these instructions to prevent the pump from freezing during storage Storage Before you store the pressure washer make sure you do the following 1 Unpl...

Page 12: ...een unloader and gun Check all connections between unloader and gun for leaks Tighten loose components and replace damaged components Gun leaking internally Replace spray gun Poor Or No Detergent Supp...

Page 13: ...13 RevE 157304 Parts Breakdown...

Page 14: ...cal 1 52 35169 Inlet filter 1 19 2212 Chemical strainer 1 53 305267 Strain relief nut 1 20 777165 Chemical hose 48 54 777645 F npt x hose barb 1 21 31934 Chemical injector 1 55 17141 Hose clamp 1 22 7...

Page 15: ...u t 1 T u r n 2 T u r n 3 R e li e v e pr e s s u r e s p r a y 4 5 P r ot e c t fr o m S t a r t 1 C o n n e c t 2 C o n n e c t 3 C o n n e c t 4 T u r n 5 S p r a y w at e r 6 T u r n 7 157303 Part...

Page 16: ...F NPT x hose barb 1 11 778214 Top electrical housing 1 39 17141 Hose clamp 1 14 33556 Terminal block decal 1 40 2264 1 2 black inlet hose 24 15 34200 Terminal block 1 41 2263 1 2 hose clamp 2 16 7781...

Page 17: ...End 1 121 13978 O Ring Seal Case 3 30 48224 Cover Bearing Blind 1 127 43319 V Packing 6 31 828710 Protector Oil Cap 1 128 46618 Adapter Male 3 32 46798 Cap Oil Filler Domed 1 139 22179 Plug Inlet 1 2...

Page 18: ...18 157303 Pump Breakdown...

Page 19: ...19 Wiring Diagram 157304 L2 L1 157303 L2 L1...

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