North Star 157394 ユーザーズマニュアル

- 11 -

1.  Inspect and clean the water intake screen on the unit before each use.

2.  Always be sure the unit is receiving the proper 120 volts.  Be certain the cord is equipped with 

the appropriate ground prong plug to ensure proper grounding.  Electrical cords and connections 

should not contact water.

3.  Always follow STOPPING THE PRESSURE WASHER instruction outlined on page 10 of this 

manual.

4.  Do not operate the unit in bypass mode (trigger not squeezed) for more than 10 minutes, this will 

cause premature failure of the pump packings.

5.  Only run pump with water supply turned on all the way.  Never allow pump to run dry.

6.  Run a gallon of clean water through the injection line after each use.  This flushes out any 

corrosive chemicals and prevents residue from damaging moving parts.

7.  Use a water softener if the water supply has a high mineral content.  This will avoid accumulation 

of mineral deposits in the coil/heat exchanger.  If a softener is not available it is necessary to 

“de-scale” the coil occasionally.  See your nearest Northern store or call 1-800-270-0810 for 

customer service.

8.  Detergents are corrosive.  It may be necessary to repair or replace components on the detergent 

injector system periodically as part of standard maintenance.

9.  Never pump acids, alkalines or abrasive fluids through the unit.

10.  Never operate the unit without the hood cover.

11.  Eliminate leaks found in the pumping system by removing suspect parts, applying sealant to the 

threads and reinstalling.  If using Teflon tape, be sure no tape gets into any plumbing, this causes a 

plugged spray nozzle and internal problems.

12.  Change pump crankcase oil after first 50 hours of use, then every 250 hours.  Use only 

SAE 80-90, non-detergent oil.  Oil level should be 2 mm. from transparent elbow surface.  Check 

oil once a week.

13.  Change fuel filter to burner every 6 months and screen in the fuel pump on the burner each year.  

Be sure to use only high quality No. 1 or No. 2 Diesel.

14.  Never spray water directly into the unit or store outdoors where it can be exposed to rain or other 

adverse weather conditions.

15.  Never store the unit in a freezing environment.  This causes the coil/heat exchanger to rupture 

and the water pump to “lock up”.. Never pour hot water on a frozen pump, a temperature change 

greater than 1 50, F can crack the water pump.  Again, do not store the unit in a freezing 

environment.