1. Check to see that water pump is properly
lu bri cat ed.
2. Follow winterizing instructions to prevent freeze
dam age to pump and coils.
3. Always neutralize and ﬂ ush detergent from sys tem
4. If water is known to have high mineral content, use
a water softener in your water sys tem, or de-scale
as need ed.
5. Do not allow acidic, caustic or abrasive ﬂ uids to be
pumped through sys tem.
6. Always use high grade quality cleaning products.
7. Never run pump dry for extended periods
8. Use clean fuel: kerosene, No. 1 fuel oil, or diesel.
Clean or replace fuel ﬁ lter every 100 hours of
op er a tion. Avoid water contaminated fuel as it will
dam age the fuel pump.
9. If machine is operated with smoky or eye burning
ex haust, coils will soot up, not letting water reach
max i mum op er at ing temperature.
1 0. Never allow water to be sprayed on or near engine
or burner assembly or any electrical com po nent.
1 1. Periodically delime coils as per instructions.
1 2. Check to see that engine is properly lubricated.
It is advisable, periodically, to visually inspect the
burn er. Check air inlet to make sure it is not clogged
or blocked. Wipe off any oil spills and keep equipment
clean and dry.
The ﬂ ow of combustion and ventilating air to the burn er
must not be blocked or obstructed in any manner.
The area around the pressure washer should be kept
clean and free of combustible materials, gasoline and
other ﬂ am ma ble vapors and liquids.
MAINTENANCE AND SERVICE
Unloader valves are preset and tested at the factory
be fore shipping. Occasional adjustment of the unloader
may be necessary to maintain correct pressure.
Damage due to freezing is not covered by warranty.
Ad here to the following cold weather procedures when-
ev er the washer must be stored or operated outdoors
under freez ing conditions.
During winter months, when temperatures drop below
32°F, protecting your machine against freezing is nec-
es sary. Store the machine in a heated room. If this is
not pos si ble then mix a 50/50 solution of anti-freeze
and water in the ﬂ oat tank. Turn the engine on to si phon
the anti-freeze mix ture through the machine. If com-
pressed air is avail able, an air ﬁ tting can be screwed
into the ﬂ oat tank by re mov ing the ﬂ oat tank strainer
and ﬁ tting. Then inject the com pressed air. Water will
be blown out of the ma chine when the trig ger on the
spray gun is opened.
High Limit Hot Water Thermostat:
For safety, each machine is equipped with a tem per a-
ture sen si tive high limit control switch. In the event that
the wa ter should exceed its operating temperature,
the high limit con trol will turn the burner off until the
water cools then it will automatically reset itself. The
ther mo stat sen sor is lo cat ed on the discharge side of
the heat ing coil. The ther mo stat con trol dial is located
on the con trol pan el.
Before running the pump check the pump crankcase for
a proper oil level. A proper oil level is indicated by the
red dot in the sight glass or between the high and low
marks on the dipstick. Use only SAE 30 non-de ter gent
oil. Change the initial oil after the ﬁ rst 50 hours and then
change the oil every 500 hours or every three months.
When draining oil, clean inside of crankcase to re move
all impurities. CAUTION: When operating in damp
plac es or with high temperature ﬂ uctuations oil
must be changed immediately.
Cleaning of Coils:
In alkaline water areas, lime deposits can accumulate
rap id ly inside the heating coil. This growth is in creased
by the extreme heat build up in the coil. The best pre-
ven ta tive for liming conditions is to use high quality
clean ing de ter gents. In areas where alkaline water is
an ex treme problem, pe ri od ic use of Coil Conditioner
will re move lime and other deposits before coil be-
comes plugged. (See Deliming in struc tions for use of
1. Fill container with Kärcher scale inhibitor ﬂ uid
2. Obtain water hardness values from local water
authority, or using a water hardness testing kit.
3. Adjust impulse transmitter in electric cabinet
(preset at #5.)
9.800-103.0 - M • Karcher HDS 615-617