Maintenance of Dirt Killer nozzles
Sand, grit or rust particles in water or hot water, further reduce the life expectancy of a Dirt Killer. If the Dirt Killer fails prematurely, return for inspection at no charge. Follow the steps listed below to insure longer life of your Dirt Killer nozzle.
- If the nozzle slows, shoots a bad pattern, or stops, cease using the nozzle immediately. Failure to do so causes turbine damage. Take nozzle apart: clean nozzle and nozzle shaft with paper clip or gas tip cleaner.
- Filter inlet water before the pump and use high-pressure filter.
- Do not cavitate the pump; this will cause seat damage.
- Do not hit against hard objects or drop.
- Works best with pressure regulating unloaders. Flow regulated unloaders reduce Dirt Killer life.
- When starting, point nozzle down to prevent ceramic tip damage.
- Keep temperature below 180° F.
- Important: Do not trigger on and off. This causes excessive wear.
- Do pre-cleaning of heaviest dirt and grease with the heat turned off and then do final cleaning with hot water.
- Best to use a high-pressure filter. Hot water machines pass a lot of calcium, iron and soap build up that must be filtered.
By following recommendations for long life the Dirt Killer will perform as follows:
3000 PSI = Approx. 150-300 hours before rebuilding
2000 PSI = Approx. 300-500 hours before rebuilding
1000 PSI = Approx. 400-700 hours before rebuilding
Rebuilding instructions for the Dirt Killer nozzle
- Remove cover and unscrew inlet adapter.
- Remove turbine nozzle and check for clogs.
- If clogged, clear turbine nozzle and re-assemble.
- To rebuild entire nozzle remove entire contents, to include seat.
- Put small O-ring on tip of seat. Smear seat with 272 Loctite and press seat into tip of nozzle.
- Change large O-ring on inlet adapter.
- Drop turbine nozzle into nozzle body and screw inlet adapter on. Back of nozzle turbine should not be centered.
- Put cover back on Dirt Killer.
Sizing Dirt Killer nozzles
Often when end-users report problems with Dirt Killer nozzles there are two causes: dirt in the nozzle, or the wrong size nozzle has been put on the pressure washer. One of the symptoms that the Dirt Killer nozzle you are using is too small is when the O-ring at the tip of the Dirt Killer nozzle begins to come out around the ceramic seat. It is critical to properly size the Dirt Killer nozzle to your pressure washer. Failure to do so will cause premature failure of the Dirt Killer nozzle.
The orifices of the Dirt Killer nozzles are standard sizes as defined by Spraying Systems. Use a standard nozzle chart to size the Dirt Killer nozzle with your pressure washer. Cross-reference the flow and psi of the pressure to determine the proper nozzle size. However a problem can arise in the event that the pressure washer calls for a size that does not specifically match the sizes offered for the Dirt Killer nozzles. For example, if your pressure washer produces 3,000 PSI and generates 4.0 GPM, the nozzle chart would call for a 5.0 nozzle. Since Dirt Killer nozzles only come in sizes 3.0, 3.5, 4.5, 5.5 and 7.0 you have a choice of either the 4.5 of 5.5. We recommend selecting the 5.5 Dirt Killer or Industrial Dirt Killer nozzle.
We have found that though you may lose a little pressure, due to the slightly larger orifice size, the Dirt Killer nozzle will last considerably longer -- and you will still have the great cleaning effect of the DK or IDK nozzle.