STP SERIES PRESSURE WASHER
OPERATOR’S MANUAL
9
Shark STP • 97-6153 • Rev. 7/03
PREVENTATIVE MAINTENANCE
1. Use clean fuel - kerosene, No. 1 home hearing fuel or
diesel fuel. Clean or replace fuel filter every 100 hours
of operation. Avoid water contaminated fuel as it will
seize up the fuel pump. De-soot coils monthly. Use
an additive if diesel is being used.
2. Check to see that the attached pressure washer water
pump is properly lubricated.
3. Follow Winterizing Procedures to prevent freeze dam-
age to pump coils.
4. Always neutralize and flush detergent from system
after use.
5. If water is known to be high in mineral content, use a
water softener in your water system or de-scale as
needed.
6. Do not allow acidic, caustic or abrasive fluids to be
pumped through system.
7. Always use high grade quality cleaning products.
8. Never run pump dry for extended periods of time.
9. If machine is operated with smoking or eye burning
exhaust, coils will soot up, not letting water reach
maximum operating temperature. (See section on
Air Adjustments.)
10. Never allow water to be sprayed on or near engine
or burner assembly or any electrical component.
11. Periodically delime coils per instructions.
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 this equipment clean and
dry.
The areas around the Shark washer should be kept clean
and free of combustible materials, gasoline and other flam-
mable vapors and liquids.
The flow of combustion and ventilating air to the burner
must not be blocked or obstructed in any manner.
MAINTENANCE AND SERVICE
Unloader Valves:
Unloader valves are preset and tested at the factory be-
fore shipping. Occasional adjustment of the unloader may
be necessary to maintain correct pressure. Call your
local dealer for assistance.
Winterizing Procedure:
Damage due to freezing is not covered by warranty. Ad-
here to the following cold weather procedures whenever
washer must be stored or operated outdoors under freez-
ing conditions. During winter months, when temperatures
drop below 32°F, protecting your machine against freez-
ing is necessary. Store machine in a heated room. If this
is not possible then mix a 50/50 solution of anti-freeze/
water into a 5 gallon bucket. Place a short section of
garden hose into bucket and connect it to machine. Elevate
bucket and turn pump on to siphon anti-freeze through
machine. If compressed air is available, an air fitting can be
screwed into the inlet connector and, by injecting com-
pressed air, all water will be blown out of system.
High Limit Hot Water Thermostat:
For safety, each machine is equipped with a high limit
control switch. In the event that the temperature of the
water should exceed its operating temperature, the high
limit control will turn the burner off until the water cools.
Pumps:
Use only SAE 30W non-detergent oil. Change oil after
the first 50 hours of use. Thereafter, change the oil every
three months or at 500 hour intervals. Oil level should be
checked by using the dipstick found on top of the pump
or the red dot visible through the oil gauge window. Oil
should be maintained at that level.
Cleaning of Coils:
In alkaline water areas, lime deposits can accumulate
rapidly inside the coil pipes. This growth is increased by
the extreme heat build up in the coil. The best prevention
for liming conditions is to use high quality cleaning de-
tergents. In areas where alkaline water is an extreme
problem, periodic use of Shark Deliming Powder (part
#9-028008) will remove lime and other deposits before
coil becomes plugged. (See Deliming Instructions for use
of Shark Deliming Powder.)
Deliming Coils:
Periodic flushing of coils is recommended.
1. Fill a container or optional float tank with 4 gallons of
water, then add 1 lb. of deliming powder. Mix thoroughly.
2. Remove wand assembly from spray gun and put spray
gun into container. Secure the trigger on the spray
gun into the open position.
3. Attach a short section (3-5 ft.) of garden hose to
machine to siphon solution from an elevated con-
tainer. Turn pump switch on, allowing solution to be
pumped through coils back into the container. Solu-
tion should be allowed to circulate 2-4 hours.
4. After circulating solution flush entire system with
fresh water. Reinstall wand assembly to spray gun.
Removal of Soot in Heating Coil:
In the heating process, fuel residue in the form of soot
deposits may develop between the heating coil pipe and
block air flow which will affect burner combustion. When
soot has been detected on visual observation, the soot
on the coil must be washed off after coil has been re-
moved using the following steps: