Detergents & General Operating Techniques; Thermal Pump Protection; Cleaning Tips; Rinsing - Kärcher HDS 3.9/20 Ea Cage Operator's Manual

Detergents & General Operating
Techniques
WARNING: Some detergents
may be harmful if inhaled or
WARNING
ingested, causing severe
nausea, fainting or poisoning.
The harmful elements may
cause property damage or
severe injury.
STEP 1: Connect detergent
injector to discharge nipple on
machine, Connect high pressure
hose to injector with quick coupler
(check to make sure locking coupler sleeves are in
proper position before applying water pressure.
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STEP 2: Use detergent designed
specifically for pressure washers.
Household detergents could damage
the pump. Prepare detergent solution
as required by the manufacturer. Fill a
container with pressure washer
detergent. Place the filter end of
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detergent suction tube into the
detergent container.
STEP 3: Apply safety latch to spray gun trigger. Turn
variable pressure control handle until discharge water
exits both tubes. Secure black detergent nozzle into
quick coupler if you have a single wand. NOTE:
Detergent cannot be applied using Red, Yellow, Green
or White nozzles.
STEP 4: With the engine running,
pull trigger to operate machine.
Liquid detergent is drawn into the
machine and mixed with water.
Apply detergent to work area. Do
not allow detergent to dry on
surface.
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Karcher HDS 505, 508, 509, 510 Operator's Manual 9.800-078.0 - R

Thermal Pump Protection

If you run the engine on your pressure washer for 3-5
minutes without pressing the trigger on the spray gun,
circulating water in the pump can reach high tempera-
tures. When the water reaches this temperature, the
pump protector engages and cools the pump by
discharging the warm water onto the ground. This
thermal device prevents internal damage to the pump.

Cleaning Tips

Pre-rinse cleaning surface with fresh water. Place
detergent suction tube directly into cleaning solution
and apply to surface at low pressure (for best results,
limit your work area to sections approximately 6 feet
square and always apply detergent from bottom to top).
Allow detergent to remain on surface 1-3 minutes. Do
not allow detergent to dry on surface. If surface
appears to be drying, simply wet down surface with
fresh water. If needed, use brush to remove stubborn
dirt. Rinse at high pressure from top to bottom in an
even sweeping motion keeping the spray nozzle
approximately 1 foot from cleaning surface. Use over-
lapping strokes as you clean and rinse any surface. For
best surface cleaning action spray at a slight angle.
Recommendations
• Before cleaning any surface, an inconspicuous
area should be cleaned to test spray pattern
and distance for maximum cleaning results.
• If painted surfaces are peeling or chipping, use
extreme caution as pressure washer may
remove the loose paint from the surface.
• Keep the spray nozzle a safe distance from the
surface you plan to clean. High pressure wash
a small area, then check the surface for
damage. If no damage is found, continue to
pressure washing.
CAUTION - Never use:
• Bleach, chlorine and other corrosive chemicals
• Liquids containing solvents (i.e., paint thinner,
gasoline, oils)
• Tri-sodium phosphate products
• Ammonia products
• Acid-based products
These chemicals will harm the machine and will
damage the surface being cleaned.

Rinsing

It will take a few seconds for the detergent to clear.
Apply safety latch to spray gun. Remove black soap
nozzle from the quick coupler. Select and install the
desired high pressure nozzle. NOTE: You can also stop
detergent from flowing by simply removing detergent
siphon tube from bottle.
Operations
13