HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
15
PRESSURE WASHER
OPERATOR’S MANUAL
Storage
DANGER: Do not store flammable liquids (gasoline,
diesel fuel, solvents, etc.) near pressure washer, or
in non-ventilated areas.
1. Protect from freezing by storing in a heated area,
or by flushing the system with antifreeze (use an
automotive engine antifreeze or windshield washer
solvent to antifreeze). To flush the system, fill the
float tank with antifreeze. Start machine and allow
to run until antifreeze flows from the end of the wand.
Squeeze and release the trigger gun several times to
antifreeze the unloader system. Also draw antifreeze
through the detergent inlet line to antifreeze the
detergent system. For added protection after
antifreezing, disconnect the pressure hose from
machine and remove the coil drain plug (refer to
Figure 1 for location). After coil has drained, replace
pressure hose and coil drain plug. If the pressure
washer is not to be used for an extended length of
time, it is recommended that the system be flushed
with antifreeze for rust protection.
MAINTENANCE
WARNING: Unauthorized machine modification or
use of non-approved replacement parts may cause
personal injury and/or property damage and will void
the manufacturer warranty.
Pump
Lubrication: To lubricate pump, use 30W non-detergent
oil for pump crankcase. Crankcase must be filled to center
of sight glass window found on the rear of the pump, (refer
to
Figure 11). During the break-in-period, make sure the
oil is changed after the first 25 hours of operation. After
that, replace oil every 3 months or 300 hours of operation,
whichever comes first.
Proper Pump Care
• DO NOT pump acids.
• DO NOT allow pump to run dry.
• Winterize if storing in freezing temperatures, refer
to
Storage for details.
MAINTENANCE
• Use a water softener on the water system if known
to be high in mineral content.
• Use only high quality detergents and follow manu-
facturer’s mix recommendations.
• Flush the system with clean water immediately
after using detergent solutions.
• Clean filter screen on detergent inlet line periodi-
cally.
• Flush the pressure washer system with antifreeze
if storing for an extended period of time. Refer to
Storage for details.
Pump Motor
On a yearly basis, oil pump motor per instructions on
motor nameplate.
NOTE: Some motors may be equipped with perma-
nently lubricated bearings and will not require ad-
ditional lubrication.
Gas Burner
It is recommended that the gas burner be serviced yearly
or as needed. Contact your local service center.
Rupture Disk
If pressure from pump or thermal expansion should
exceed safe limits, the rupture disk will burst, allowing
high pressure to be discharged through hose to ground.
When the disk ruptures it will need to be replaced.
Caution: Inspect rupture disk annually for any
obstruction.
Unloader Valve
WARNING: The unloader valve on this pressure
washer has been factory set and sealed and is a
field nonadjustable part. Tampering with the factory
setting may cause personal injury and/or property
damage, and will void the manufacturer warranty. For
replacement refer to Figure 21, Item 3.
Heating Coil
Coil Descaling: In hard water areas, scale buildup within
the heating coil will occur. Scale deposits will decrease
the water temperature rise and may eventually clog the
heating coil. Contact your local service center when
descaling is needed.
Coil Desooting: Poor grades of fuel or inadequate
combustion air will cause heavy soot buildup on the
outside surface of the heating coil. These deposits will
insulate the coil. This will restrict the air flow through the
coil, further aggravating the soot buildup. Contact your
local service center when desooting is needed.
Figure 10 - Pump Lubrication
Oil Fill
Sight Glass
Oil Drain
