9.803-436.0-B • Operator Kärcher HDS Diesel
OPERA
T
OR’S MANU
AL
PRESSURE W
ASHER
12
MAINTENANCE
PREVENTATIVE MAINTENANCE
1. Check to see that water pump is properly lubri-
cated.
2. Follow winterizing instructions to prevent freeze
damage to pump and coils.
3. Always neutralize and fl ush detergent from system
after use.
4. If water is known to have high mineral content, use
a water softener in your water system, or de-scale
as needed.
5. Do not allow acidic, caustic or abrasive fl uids to be
pumped through system.
6. Always use high grade quality cleaning products.
7. Never run pump dry for extended periods of time.
8. Use clean No. 2 diesel fuel. Clean or replace fuel
fi lter every 250 hours of operation. Avoid water con-
taminated fuel as it will damage the fuel pump.
9. If machine is operated with smoky or eye burning
exhaust, coils will soot up. Adjust air bands and fuel
pressure for proper emission.
10. Never allow water to be sprayed on or near the
engine or burner assembly or any electrical com-
ponent.
11. Periodically delime coils as per instructions.
12. Check to see that engine is properly lubricated. Use
SAE 10W40 grade oil.
It is advisable, periodically, to visually inspect the
burner. 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 burner
must not be blocked or obstructed in any manner.
The area around the washer should be kept clean and
free of combustible materials, gasoline and other fl am-
mable vapors and liquids.
MAINTENANCE AND SERVICE
Unloader Valves:
Unloader valves are preset and tested at the factory
before shipping. Occasional adjustment of the unloader
may be necessary to maintain correct pressure.
Adjusting Unloader Valves:
Tampering with the factory setting may cause per-
sonal injury and/or property damage and will void the
manufacturer's warranty.
Winterizing Procedure:
Damage due to freezing is not covered by warranty. Ad-
here to the following cold weather procedures whenever
the washer must be stored or operated outdoors under
freezing conditions.
During winter months, when temperatures drop below
32°F, protecting your machine against freezing is neces-
sary. Store the machine in a heated room. If this is not
possible then mix a 50/50 solution of anti-freeze and
water in the fl oat tank. Turn the engine on to siphon the
anti-freeze mixture through the machine. If compressed
air is available, an air fi tting can be screwed into the
fl oat tank by removing the fl oat tank strainer and fi tting.
Then inject the compressed air. Water will be blown
out of the machine when the trigger on the spray gun
is opened.
High Limit Hot Water Thermostat:
For safety, each machine is equipped with a tempera-
ture sensitive high limit control switch. In the event that
the water should exceed its operating temperature,
the high limit control will turn the burner off until the
water cools, then it will automatically reset itself. The
thermostat sensor is located on the discharge side of
the heating coil. The thermostat control dial is located
on the control panel.
Pumps:
Use only SAE 10W-40 or 30W non-detergent oil.
Change oil after fi rst 50 hours of use. Thereafter, change
oil every three months or at 500 hour intervals. Oil level
should be checked through use of dipstick found on top
of pump, or the red dot visible through the oil gauge
window. Oil should be maintained at that level.
