LANDA MHP • 8.913-925.0 • Rev. 8/13
15
PRESSURE
W
ASHER
OPERA
TOR’S MANU
AL
1. Check to see that water pump is properly
lubricated.
2. Follow winterizing instructions to prevent freeze
damage to pump and coils.
3. Always neutralize and flush detergent from system
after use.
4. If water is known to be high in mineral content, use
a water softener on your water system, or de-scale
as needed.
5. Do not allow acidic, caustic or abrasive fluids to
be pumped through system.
6. Always use high grade quality Landa cleaning
products.
7. Never run pump dry for extended periods of
time.
8. Use clean fuel — kerosene, No. 1 fuel oil, or diesel.
Replace fuel filter every 100 hours of operation.
Avoid water contaminated fuel as it will seize up
the fuel pump.
9. If machine is operated with smoky 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 the
engine, the burner assembly or any electrical
components.
11. Periodically delime coils per instructions.
12. Check to see that engine is properly lubricated.
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 equip-
ment clean and dry.
The areas around the Landa washer should be kept
clean and free of combustible materials, gasoline and
other flammable 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 relieve pressure in the line when a
spray gun is closed. Unloader valves are preset and
tested at the factory before shipping. Tampering with
the factory setting may cause personal injury and/or
property damage, and will void the manufacturer's
warranty.
Winterizing Procedure
Damage due to freezing is not covered by warranty.
Adhere to the following cold weather procedures when-
ever the washer must be stored or operated outdoors
under freezing conditions.
PReVeNTaTIVe MaINTeNaNCe
During winter months, when temperatures drop below
32°F, protecting your machine against freezing is
necessary. Store the machine in a heated room. If this
is not possible then mix a 50/50 solution of antifreeze
and water into a 5 gallon bucket. Place a short section
of garden hose into the bucket and connect it to the
machine. Elevate the bucket and turn the pump on
to siphon the antifreeze through the machine. If com-
pressed air is available an air fitting can be screwed
into the inlet connector and, by injecting compressed
air, all water will be blown out of the system.
High limit Hot Water Thermostat
For safety, each machine is equipped with a high
limit control switch. In the event 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 30 weight non-detergent oil. Change
oil after first 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.
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
preventative for liming conditions is to use high quality
cleaning detergents. In areas where alkaline water is
an extreme problem, periodic use of Landa Deliming
Powder (Landa Part #9-028008) will remove lime
and other deposits before coil becomes plugged.
(See Deliming Instructions for use of Landa Deliming
Powder.)
Deliming Coils
Periodic flushing of coils or optional float tank is rec-
ommended.
Step 1 Fill a container with 4 gallons of water,
then add 1 lb. of deliming powder. Mix thor-
oughly.
Step 2 Remove wand assembly from spray gun and
put spray gun into container or optional float
tank. Secure the trigger on the spray gun
into the open position.
Step 3 Attach a short section (3-5 ft.) of garden
hose to machine to siphon solution from
an elevated container. Turn engine on, al-
lowing solution to be pumped through coils
back into the container. Solution should be
allowed to circulate 2-4 hours.