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MAINTENANCE
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. Only run pump with water supply turned on all the way. Never allow pump to run dry.
5. 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.
6. 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 1-800-222-5381 for customer service.
7. Detergents are corrosive. It may be necessary to repair or replace components on the detergent
injector system periodically as part of standard maintenance.
8. Never pump acids, alkalines or abrasive fluids through the unit.
9. Never operate the unit without the hood cover.
10. 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.
11. Change pump crankcase oil after first 50 hours of use, then every 200 hours (see Oil data on page 7)
12. 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.
13. Never spray water directly into the unit or store outdoors where it can be exposed to rain or other
adverse weather conditions.
14. 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 150°F can crack the water pump. Again, do not store the unit in a freezing environment.