NorthStar M157310K.1 Installation, Operation And Maintenance Manual Download Page 9

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Operating Instructions

Read and understand the entire manual before operating the pressure washer.

Follow these instructions every time you use the pressure washer.

I.) Pre-Operation

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A.) Position the machine for easy access to all

controls.

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B.) Position the machine on a solid surface, with

less than a three degree slope, and so it is
protected from external damage.

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C.) Position the machine so that ambient lighting is

sufficient for the surface you are cleaning to be
seen with ease. Use artificial light if needed.

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D.) Check hoses, fittings, wand, trigger gun and fuel

connections for signs of wear, cracks and
looseness, and replace as required.

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E.) Check and clean the nozzle orifice.

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F.) Check and clean the water inlet screen and

filter.

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G.) Read entire manual, especially the important

safety instructions listed on page 2.

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H.) Check and maintain proper oil levels in the

pump and engine.

II.) Check Your Water Supply

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A.) Make sure the water supply is clean. Debris can

cause excess pump wear and reduce
performance.

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B.) An insufficient water supply will damage your

pump. Make sure the water supply is steady
and is 20% over the rated flow of your pump.
Use a stopwatch to time how long it takes to fill a
5 gallon bucket with your garden hose.

Example:

If the rated flow is = 4gpm

Then required flow = 4 x 1.20 = 4.8gpm

5gallons / 4.8gpm = 1.04 minutes

1.04min x 60sec/min = 62 seconds

Therefore, you must be able to fill a

5 gallon bucket in 62 seconds or faster.

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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”.

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D.) Never use a reservoir tank as a water source.

This pressure washer is designed for a
pressurized water source such as a city water
faucet. Sucking water out of a tank may cause
pump cavitation and damage to your pump.
However, the inlet pressure of the pump must
not exceed 75 psi (5.25 bar).

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E.) Always use a flexible rubber hose for your water

supply. Do not use rigid piping.

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F.) Do not pump flammable liquids or liquids

containing incompatible chemicals or solvents.

III.) Attach Garden Hose

Remove shipping plug from pump inlet and confirm
rubber washer is in place. Attach garden hose to water
inlet. See Machine Component Identification for location
of water inlet.

IV.) Attach High Pressure Hose

Your pressure washer hose is equipped with quick
couplers. Simply pull the collar back and push the
coupler onto the nipple. Make sure the collar slides over
the ball bearings. Once the connection is made, pull on
the hose to assure a positive connection.

V.) Turn Water Supply ON

Make sure the hose is not “kinked”. A kinked hose will
provide insufficient water supply to the pump and will
reduce its life. Make sure the hose remains unkinked
after moving the pressure washer.

VI.) Squeeze Trigger

Squeeze the trigger until a steady flow of water sprays
out the nozzle. Make sure all the air is out of all hoses
before running the pressure washer. This step is very
important, it will prolong the pump’s life. NEVER run the
pump dry.