North Star M157304E User Manual
M157304E
157303 & 157304 Manual
ITEM NUMBER:
SERIAL NUMBER:
HP:______ Volts:______ Amp:______ Ph:_____
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.
RPM:____ PSI:____ GPM:____ Nozzle Size:_____
Pump:___________ Hose:______ Lance:_______
Max. Discharge Temperature:_____________
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
Maintenance
Schedule
Hours: Monday - Friday 7:00 AM to 5:30 PM Unit 2, Keel Close,
Use any North Star brand or equivalent pressure washer chemicals.
Adjust soap adjustment knob to regulate cleaning power.
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 1-800-270-0810 Northern Tool and Equipment Co. (UK) Ltd.
Saturday 7:30 AM-11:30 AM Central Time Portsmouth, Hants PO3 5QD, England
Call 02392639752
1
Table of Contents
Important Safety Instructions 2 Maintenance Instructions 10-11
Grounding Instructions 2 Long Term Storage 11
Machine Component Identification 3 Troubleshooting 12
Installation Instructions 4-7 Parts Breakdowns 12-17
Operating Instructions 8-10 Wiring Diagram 18
Important Safety Instructions
WARNING -Risk of Injection or Injury to Persons - Do Not Direct Discharge Stream at Persons. - Do not use a hose if
exterior damage is evident.
-Risk of explosion. - Do not spray flamm a ble li qui d s. - Do not o perat e i n a flam m a bl e envi ro nment.
CAUTION -Gun kicks back. Hold with both hands.
-To reduce the risk of injury, read operating instructions carefully before use.
WARNING - When using this product basic precautions should always be followed, including the following:
1.) Read all the instructions before using the product.
2.) To reduce the risk of injury, close supervision is necessary when the product is used near children. Do not allow
irresponsible use by children. Always stop the product and bleed pressures before leaving unattended,
disconnecting hoses, or servicing the pump.
3.) Know how to stop the product and bleed pressures quickly. Be thoroughly familiar with the controls.
4.) Stay alert - watch what you are doing.
5.) Do not operate the product when fatigued or und er the influence of alcohol or drugs. Never smoke while operating
this machine.
6.) Keep operating area clear of all persons.
7.) Do not overreach or stand on unstable support. Keep good footing an d balance at all times. Wear footwear capa ble
of maintaining a good grip on wet surfaces - Do not place the machine on soft or unstable ground.
8.) Follow the maintenance instructions specified in all manuals. Do not run machine 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 with broken or missing parts. - Never alter the manufacturer’s original design or
deactivate any safety device on the machine.
11.) Risk of exposure to dangerous chemicals. Wear protective gloves when handling and cleaning with chemicals.
Follow the chemical manufacturer’s directions. Understand all safety hazards and first aid for all chemicals being
used. Check whether dangerous chemicals have been used and take any precautions that may have been
recommended by the supplier of these chemicals when cleaning filters. Do not pump highly abrasive fluids or use
with incompatible chemicals or solvents.
12.) Know the pressure and temperature limits of your machine. Be sure all high pressure accessories meet or exceed
your machine’s limits. Do not set the pressure relief valve above the machine’s limit.
13.) Do not move this machine by pulling on the hose. Do not use the pump to support other items of equipment that
impose unacceptable loads on the pump. Do not attempt to use this machine as a prop.
14.) To reduce risk of injury, do not secure the spray gun open. Your spray gun is equipped with a built-in trigger safety
latch to guard against accidental trigger release and potentially dangerous high pressure spray. Rotate the safety
latch to the locked position when not spraying.
15.) Do not clean this machine with its own spray. Cleaning should be done with a damp sponge with the electrical
power turned OFF.
Grounding Instructions
This product must be connected to a grounded, metal, permanent wiring system; or an equipment-grounding conductor must be run
with the circuit conductors and connected to the equipment-grounding terminal or lead on the product.
SAVE THESE INSTRUCTIONS
2
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
3
Installation Instructions
I.) Unpack
Separate and identify all components. Use the assembly instructions in this manual for assembly.
4
HARDWARE BAG: Separate and identify all components. Use the assembly instructions in this manual for assembly.
5
II.) Assembly Instructions
A. 1. To spray chemical, insert the chemical injector into the
quick connect oulet o f the pressure washer as shown.
2. Connect the clear hose to the chemical strainer and to
the inlet of the chemical injector. This is inside the base
unit on the 157303, chemical injector can remained
installed at all times. Have hose exit base as shown
below.
3. Install the pressure hose onto the chemical injector as
shown, 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 into the lance end.
6. Make sure all plumbing connections are tight.
Nozzle
Lance
Extension
Spray
Gun
Quick Connect
Outlet
7. Install four rubber feet onto base with four 1/4” x 3/4”
flange bolts and four flange nuts. Use the same bolts to install
cross members when installing the rubber feet.
High Pressure
Hose
Chemical
Injector
157304 only
Chemical Hose
Exit for 157303
Clear
Hose
Chemical
Strainer
RUBBER FEET
FIG0235
6
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