Page 1
1800PSI
The Reliable Ones
High Pressure Washer
Owner’s Manual
Problems?
Questions?
Before taking your unit
back to the store,
call the pressure washer
helpline at
1-800-270-1408
M-F 8-5 CST
This pressure
washer is equipped
with an Automatic
Cool Down System.
See page 12 for
details.
GENERAC
This symbol points out important safety instructions, which, if not followed, could endanger the personal safety and/or property of yourself and others. Read and follow all
instructions in the manual before attempting to operate this unit.
Model No. 11390 (1800 PSI High Pressure Washer) Manual No. B2308 Revision 0 (1/28/98)
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High Pressure Washer
Generac 1800PSI High Pressure Washer
GENERAC
CAUTION: Always disconnect spark plug wire and place wire where it cannot contact spark
plug to prevent accidental starting when setting up, transporting, adjusting or making repairs
to your high pressure washer.
Engine exhaust gases contain DEADLY carbon monoxide gas.
This dangerous gas, if breathed in sufficient concentrations, can
cause unconsciousness or even death. Operate this equipment
only in the open air where adequate ventilation is available.
Gasoline is highly FLAMMABLE and its vapors are EXPLOSIVE.
Do not permit smoking, open flames, sparks or heat in the vicinity while handling gasoline. Avoid spilling gasoline on a hot engine.
Allow unit to cool for 2 minutes before refueling. Comply with all
laws regulating storage and handling of gasoline.
Locate this pressure washer in areas away from combustible
materials, combustible fumes or dust.
The high pressure equipment is designed to be used with Gen-
erac authorized parts only. If you use this equipment with parts
that do not comply with minimum specifications, the user assumes
all risks and liabilities.
Some chemicals or detergents may be harmful if inhaled or
ingested, causing severe nausea, fainting or poisoning. The harmful elements may cause property damage or severe injury.
Do not allow CHILDREN to operate the Pressure Washer at any
time.
Operate engine only at governed speed. Running the engine at
excessive speeds increases the hazard of personal injury. Do not
tamper with parts which may increase or decrease the governed
speed.
Do not wear loose clothing, jewelry or anything that may be
caught in the starter or other rotating parts.
Before starting the Pressure Washer in cold weather, check all
parts of the equipment and be sure ice has not formed there.
Units with broken or missing parts, or without protective housing
or covers should NEVER be operated.
The muffler and air cleaner must be installed and in good condi-
tion before operating the Pressure Washer. These components
act as spark arrestors if the engine backfires.
Check the fuel system for leaks or signs of deterioration such as
chafed or spongy hose, loose or missing clamps or damaged tank
or cap. Correct all defects before operating the Pressure Washer.
Do not spray flammable liquids.
Never aim the gun at people, animals or plants.
High pressure spray can cause paint chips or other particles to
become airborne and fly at high speeds.
Never allow any part of the body to come in contact with the fluid
stream. DO NOT come in contact with a fluid stream created by
a leak in the high pressure hose.
The high pressure stream of water that this equipment produces
can pierce skin and its underlying tissues, leading to serious
injury and possible amputation.
Always wear eye protection when you use this equipment or
when you are in the vicinity where the equipment is in use.
Operate the pressure at no more than the PSI fluid pressure
rated for your pressure washer.
Never move the machine by pulling on the high pressure hose.
Use the handle provided on the top of the unit.
Always be certain the spray gun, nozzles and accessories are cor-
rectly attached.
Never use a spray gun which does not have a trigger lock or trig-
ger guard in place and in working order.
Use a respirator or mask whenever there is a chance that vapors
may be inhaled. Read all instructions with mask so you are certain the mask will provide the necessary protection against inhaling
harmful vapors.
High pressure spray may damage fragile items including glass.
Do not point spray gun at glass when in the jet spray mode.
Keep the hose connected to machine or the spray gun while the
system is pressurized. Disconnecting the hose while the unit is
pressurized is dangerous.
Hold the spray gun firmly in your hand before you start the unit.
Failure to do so could result in an injury from a whipping spray
gun. Do not leave the spray gun unattended while the machine
is running.
The cleaning area should have adequate slopes and drainage to
reduce the possibility of a fall due to slippery surfaces.
Keep water spray away from electric wiring or fatal electric shock
may result.
Do not secure trigger gun in the pull-back (open) position.
Do not by-pass any safety device on this machine.
The muffler and engine heat up during operation and remain hot
immediately after shutting it down. Avoid contact with a hot muf-
fler or engine or you could be severely burned.
Operate and store this unit on a stable surface.
High pressure hose can develop leaks from wear, kinking, abuse,
etc. Water spraying from a leak is capable of injecting material
into skin.Inspect hose each time before using it. Check all hoses
for cuts, leaks, abrasions or bulging of cover, or damage or move-
ment of couplings. If any of these conditions exist, replace hose
immediately. Never repair high pressure hose. Replace it with
another hose that meets minimum pressure rating of your pres-
sure washer.
The engine exhaust from this product
contains chemicals known to the State
of California to cause cancer, birth
defects, or other reproductive harm.
WWAARRNNIINNGG::
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High Pressure Washer
Generac 1800PSI High Pressure Washer
GENERAC
3
CONGRATULATIONS on your purchase of a
GENERAC high pressure washer. It has been
designed, engineered and manufactured to give you
the best possible dependability and performance.
Should you experience any problem you cannot
easily remedy, please contact your nearest GENERAC Authorized Service facility, or call the 1-800
number listed on the front of this manual. We have
competent, well-trained technicians and the proper
tools to service or repair this unit.
Please read and retain this manual. The instructions
will enable you to assemble and maintain your high
pressure washer properly.
CUSTOMER
RESPONSIBILITIES
Read and observe the safety rules.
Follow regular schedule in maintaining, caring for
and using your high pressure washer.
Follow the instructions under Customer Responsi-
bilities and Storage sections of this Owner's
Manual.
PRODUCT SPECIFICATIONS
Pressure Washer Specifications
Outlet Pressure . . . . 1800 psi
Flow Rate . . . . . . . . . 2.0 gallons per minute (gpm)
Detergent Mix . . . . . . Use undiluted detergent
approved for pressure
washers
Water Supply . . . . . . Not to Exceed 140°F
Temperature
Automatic Cool . . . . Will cycle when water
Down System reaches 140°-145°F
Engine specifications
Engine Model . . . . . . Tecumseh Centura Elite LE
Rated Horsepower . . 6.0
Displacement . . . . . . 197cc
Spark Plug
Type . . . . . . . . RJ19LM
Set Gap To: . . 0.030 inch (0.76mm)
Gasoline Capacity . . 1.5 U.S. quarts
Oil . . . . . . . . . . . . . . . SAE 30
In the State of California a spark arrestor is required
by law (Section 4442 of the California Public
Resources Code). Other states may have similar
laws. Federal laws apply on federal lands.
NOTE: If you equip the engine of your pressure
washer with a spark arrestor muffler, the spark
arrestor must be maintained in effective working order
by the owner/operator.
You can order a spark arrestor through your
authorized Generac service facility. See Engine Owners Manual for part number.
Model Number 1139-0
Serial Number
Date of Purchase
The model and serial numbers will be found on
a decal attached to the pressure washer. You
should record both serial number and date of
purchase and keep in a safe place for future
reference.
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High Pressure Washer
KNOW YOUR PRESSURE WASHER
Read this owners manual and safety rules before operating your high pressure washer.
Compare the illustrations with your high pressure washer to familiarize yourself with the locations of various
controls and adjustments. Save this manual for future reference.
Generac 1800PSI High Pressure Washer
GENERAC
Pump Develops high pressure.
Automatic Cool Down System Cycles water
through pump when water reaches 140°-145°F. Warm
water will discharge from pump onto ground. This
system prevents internal pump damage.
Recoil Starter Used for starting the engine manu-
ally.
Spray Gun Controls the application of water onto
cleaning surface with trigger device. Includes safety
latch.
Adjustable Nozzle You must attach this to the spray
gun to provide high pressure stream. Adjustable nozzle
allows you to adjust force of spray and spray pattern.
Air Cleaner Dry type filter element limits the amount
of dirt and dust that gets in the engine.
High Pressure Outlet Connection for high pressure
hose.
Water Inlet Connection for garden hose.
High Pressure Hose Connect one end to water
pump and the other end to spray wand.
Goggles Always use the enclosed goggles or other
eye protection when running your pressure washer.
Primer Bulb Prepares a cold engine for starting.
Broom Brush with extension Use this brush to clean
driveways, sidewalks, porches, or decks. Attaches to the
spray gun with the accessories adapter or directly to the
extension.
Utility Brush Use this brush to scrub all surfaces.
Attaches to the spray gun with the accessories adapter or
directly to the extension.
Turbo Nozzle Attaches to the spray gun and allows
you to clean or rinse surfaces at high pressure.
Spray Gun
Adjustable Nozzle
Turbo Nozzle
Utility Brush
Broom Brush with Extension
High Pressure Hose
Goggles
Air Cleaner
Primer Bulb
Gas Tank
Water Inlet
Pump equipped with
Automatic Cool Down
System
Recoil Starter
High Pressure Outlet
Oil Fill Tube
Page 5
High Pressure Washer
5
Read entire Owners manual before you attempt to
assemble or operate your new pressure washer.
Your new pressure washer has been assembled at
the factory with exception of those parts left unassembled for shipping purposes.
REMOVE PRESSURE
WASHER FROM CARTON
Remove accessories insert.
Remove parts box included with pressure washer.
Slice two corners at guide handle end of carton
from top to bottom so the panel can be folded down
flat, then remove all packing material.
Roll pressure washer out of carton.
CARTON CONTENTS
Items in the carton include:
Main Unit
Accessories Insert
Turbo Wand
Utility Brush
Broom Brush
Broom Handle
Brush Extension
Brush Adapter
Parts Box (which includes the following):
Wireform
Goggles
Nozzle Cleaning Kit
Owners Manual
Engine Manual
Spray Gun
Nozzle Extension
High Pressure Hose
Handle
Parts Bag (which includes the following):
2 carriage bolts
2 knobs
If any of the above parts are missing or damaged, call
the pressure washer helpline at 18002701408.
PREPARING THE PRESSURE
WASHER FOR USE
If you have any problems with the assembly of your
pressure washer or if parts are missing or damaged,
call the Pressure Washer Helpline at 1-800-270-1408.
To prepare your pressure washer for operation you
will need to perform these tasks:
Attach the handle and attach the wire form that
holds high pressure hose and spray gun.
Connect high pressure hose to the spray gun and
the pump and connect water supply to the pump.
Add oil to engine crankcase.
Add fuel to fuel tank.
Attach the Handle
Place the top of the handle onto the bottom of the
handle already connected to the main unit making
sure the holes in the top align with the holes on the
bottom (Figure 1).
Insert the carriage bolt through the right hole (look-
ing at the front of the pressure washer) and attach a
plastic knob. Tighten the knob by hand (Figure 2).
Generac 1800PSI High Pressure Washer
AA
SSSSEEMMBBLL
YY
GENERAC
Figure 1 — Attach the top of the handle to the
bottom of the handle.
Make sure the
holes on the
top of the
handle are
aligned with the
holes in the
bottom of the
handle
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Generac 1800PSI High Pressure Washer
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GENERAC
6
High Pressure Washer
Insert the carriage hook through the left hole (look-
ing at the front of the pressure washer). Pull the
recoil handle out slowly. Place the recoil string
through the hook and attach the plastic knob.
Tighten the knob by hand (Figure 2).
Insert the wire support with the longer arm positioned
on the left. From this view the hook should resemble a
J
(Figure 3).
Add Engine Oil
IMPORTANT: Any attempt to crank or start the
engine before it has been properly serviced with the
recommended oil may result in an engine failure.
Note: When adding oil to the engine crankcase, use
only high quality detergent oil rated with API service
classification SF,SG, SH or SH/CD rated SAE 30
weight. Select the oils viscosity grade according to
your expected operating temperature. Do Not Use
SAE 10W40 Oil.
Although multi-viscosity oils (5W30, 10W30, etc.)
improve starting in cold weather, these multi-viscosity
oils will result in increased oil consumption when used
above 32°F. Check your engine oil level more frequently to avoid possible damage from running low on
oil.
Place pressure washer on a level surface.
Clean area around oil fill and remove oil dipstick
(Figure 4).
Wipe dipstick clean. Pour oil into oil fill opening until
oil reaches FULL mark on the dipstick. Stop occasionally to check oil level. DO NOT OVERFILL.
Install oil dipstick, hand tighten securely.
Note: Check Oil Often During Engine Breakin.
Add Gasoline
DANGER! Never fill fuel tank indoors.
Never fill fuel tank when engine is running or hot. Do not smoke when filling
fuel tank.
WARNING! Never fill fuel tank completely
full. Fill tank to about 1/2" below the
bottom of the filler neck to provide space
for fuel expansion. Wipe away any fuel
spillage from engine and equipment
before starting.
The manufacturer recommends fresh, clean unleaded
regular automotive gasoline.
Use clean fuel and store in approved, clean cov-
ered containers. Use clean fill funnels. Never use
stale gasoline left over from last season or gasoline stored for long periods.
Figure 3 — Fit wire form on handle.
Figure 4 — Add oil to engine crankcase. Do not
attempt to start engine without
adding oil.
Oil Fill Cap
Figure 2 — Insert the carriage bolt and hook
and attach the knobs.
colder 32°F warmer
5W30 SAE 30
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Generac 1800PSI High Pressure Washer
GENERAC
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High Pressure Washer
Clean area around fuel fill cap, remove cap
(Figure 5).
Add UNLEADED regular gasoline, slowly, to fuel
tank. Use a funnel to prevent spillage.
Install fuel cap and wipe up any spilled gasoline.
Connect Hose and Water
Supply to Pump
IMPORTANT: You must assemble wand and attach
all hoses before you start engine. Starting engine
without all hoses connected and water supplied will
damage pump.
Uncoil high pressure hose and attach one end of
hose to the base of the spray gun. (Figure 6).
Tighten by hand.
Attach other end of high pressure hose to the high
pressure fitting on the pump (Figure 7). Tighten by
hand.
Before you connect your garden hose to the water
inlet, inspect the Inlet Screen (Figure 8). Clean the
screen if it contains debris or have it replaced if
damaged. DO NOT RUN THE PRESSURE
WASHER IF THE SCREEN IS DAMAGED.
Connect garden hose to water inlet. Tighten by
hand (Figure 8).
Turn ON the water.
Squeeze trigger on gun to purge pump system of
air and impurities.
CAUTION: Before starting the pressure
washer, be sure you are wearing adequate eye protection.
Figure 7 — Connect high pressure hose to
pump.
Figure 6 — Connect high pressure hose
to spray gun.
Figure 8 — Connect the garden hose to water
inlet and turn ON the water.
Figure 5 — Add gasoline to fuel tank.
Gas Cap
Inspect inlet
screen, do
not use if
damaged,
clean if dirty
Connect High Pressure
Hose Here
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Generac 1800PSI High Pressure Washer
GENERAC
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8
High Pressure Washer
Attach nozzle extension to spray gun. Tighten By
Hand (Figure 9).
CHECKLIST BEFORE
STARTING ENGINE
If you have reached this point, look back over the
assembly to see if you have performed all of the following.
Check for properly tightened hose connections
(high pressure and water supply) and for tight connections and that there are no kinks, cuts, or
damage to the high pressure hose.
Check that oil has been added to proper level in
engine crankcase before trying to start the pressure
washer.
Add proper gasoline to fuel tank.
Provide proper water supply (not to exceed 140°F).
Be sure to read Safety Rules and Operation sec-
tions before using the pressure washer.
Figure 9 — Connect nozzle extension to spray
gun.
Page 9
Generac 1800PSI High Pressure Washer
GENERAC
9
High Pressure Washer
HOW TO USE YOUR
PRESSURE WASHER
If you have any problems operating your pressure
washer, please call the pressure washer helpline at
1-800-270-1408.
You have assembled your high pressure washer and
have prepared the engine for starting. You are now
ready to clean your car, boat or the outside of a building or whatever you plan to clean.
How to Start Your Engine
The best way to start your engine-powered pressure
washer for the first time is to follow these instructions
step-by-step. This starting information also applies
whenever you start the engine after you have let the
pressure washer sit idle for at least a day.
Place the pressure washer in an area close enough
to an outside water source that can flow at a rate of
2 gallons per minute.
Check that the high pressure hose is tightly con-
nected to the spray gun and to the pump. See
ASSEMBLY section for illustrations.
Connect the garden hose to water inlet on the pres-
sure washer pump and turn on the water.
IMPORTANT: Do not run pump without the water
supply connected and turned on. You must follow this
caution or the pump will be damaged.
Move the Throttle Control Lever to the Fast
position
Note: For a warm engine, be sure the Throttle Control
Lever is in the Fast position.
Squeeze the trigger on the spray gun to relieve the
air pressure caused by turning ON the water.
Water will spew out the gun in a thin stream. This
will make it easier to pull start the engine. Release
the trigger.
Apply the safety latch to the spray gun trigger
(Figure 10).
To start the engine for the first time:
Make sure the Engine Throttle Lever is in the
Fast position.
Push primer bulb firmly 5 times.
Grasp rope handle and pull slowly until you feel
some resistance. Then pull cord rapidly to overcome compression, prevent kickback and start the
engine. Let rope return to starter slowly.
Note: Always keep the Throttle Control Lever in the
Fast position when operating the pressure washer.
To start engine thereafter:
Make sure the engine throttle control is in the
Fast position.
Press the primer bulb 3 times. For a warm engine,
do not prime.
Grasp rope handle and pull slowly until you feel
some resistance. Then pull cord rapidly to overcome compression, prevent kickback and start the
engine. Let rope return to starter slowly.
If engine fails to start repeat above steps.
How to Stop Your Pressure
Washer
Move the Throttle Control Lever to the Slow position.
Wait for the engine to idle down.
Move the Throttle Control Lever to the Stop position.
Simply shutting off the engine will not release pres-
sure in the system. Squeeze trigger on the spray
gun to relieve pressure in the hose.
Note: A small amount of water will squirt out when
you release the pressure.
Figure 10 — Squeeze trigger to relieve water
pressure, release trigger and turn
the safety latch ON.
Safety Latch ON
Page 10
Generac 1800PSI High Pressure Washer
GENERAC
10
High Pressure Washer
How to Use the Adjustable
Nozzle
You now should know how to START your pressure
washer and how to STOP it. The information in this
section will tell you how to adjust the spray pattern
and apply detergent or any other cleaning chemicals.
DANGER! Never adjust spray pattern
when spraying. Never put hands in front
of nozzle to adjust spray pattern.
On the end of your spray gun is a nozzle that you can
slide forward and backward and that you can also
twist from side to side. With the adjustable nozzle you
can adjust the spray pattern to be either high pressure or low pressure. You can also adjust the spray
so it is concentrated in a stream pattern or expanded
into a fan pattern.
Slide the nozzle forward when you wish to adjust
the spray to low pressure mode (Figure 11). Slide
the nozzle backward to achieve high pressure.
Point the nozzle toward the ground and press the
trigger to test the pattern (Figure 12).
Twisting the nozzle adjusts the spray pattern from a
narrow pattern to a fan pattern.
For most effective cleaning, keep spray nozzle
between 8 to 24 inches away from cleaning surface.
If you get spray nozzle too close, especially using
high pressure mode, you may damage the cleaning
surface.
Do not get closer than 6 inches when cleaning
automobile tires.
Figure 11 — Using the adjustable nozzle.
Slide nozzle backward
for high pressure
mode.
Slide nozzle forward
for low pressure
mode and detergent
application.
Twist nozzle counterclockwise for fan
spray pattern.
Twist nozzle clockwise for narrow
spray pattern.
Figure 12 — Test the spray pattern.
Page 11
Generac 1800PSI High Pressure Washer
GENERAC
11
High Pressure Washer
Applying Detergent with the
Adjustable Nozzle
IMPORTANT: Use soaps designed specifically for
pressure washers. Household detergents could
damage the pump.
IMPORTANT: You must attach all hoses before you
start the engine. Starting the engine without all the
hoses connected and without the water turned ON
will damage the pump.
To apply detergent follow these steps:
Review the use of adjustable nozzles on Page 10.
Prepare the detergent solution as required by the
job.
Hang the detergent solution on hook of the wire-
form on the handle as shown in Figure 13.
Place small filter of the clear, detergent siphoning
tube into the detergent container.
Slide the adjustable nozzle forward to low pressure
mode. Detergent cannot be applied with nozzle in
high pressure position.
IMPORTANT: Detergent cannot be applied without
the water source turned on.
Make sure garden hose is connected to water inlet.
Check that high pressure hose is connected to
spray gun and pump (see ASSEMBLY), and start
the engine.
Apply detergent to a dry surface, starting from the
bottom and working up.
Allow the detergent to soak in between 3-5 minutes
before washing and rinsing.
For washing, start at lower portion of area to be
washed and work upward, using long, even, overlapping strokes.
CAUTION: Keep the detergent siphoning
tube from coming in contact with the hot
muffler. This will damage the plastic tube.
When inserting the filter into a cleaning
agent bottle, route the tube so as to keep it
from inadvertently contacting the hot muffler.
Pressure Washer Rinsing
WARNING: Be extremely careful if you
must use the pressure washer from a
ladder, scaffolding or any other relatively
unstable location. Pressure in a running
washer builds as you climb. When you
press the trigger, the recoil from the initial
spray could force you to fall. The high pressure spray could also force you to fall if you
are too close to the cleaning surface.
For Rinsing:
Slide nozzle forward to high pressure and wait for
detergent to clear.
Keep the spray gun a safe distance from the area
you plan to spray.
Apply a high pressure spray to an small area and
then check the surface for damage. If no damage
is found, you can assume it is okay to continue
cleaning.
Start at top of area to be rinsed, working down with
same overlapping strokes as you used for cleaning.
Note: You can also stop detergent from flowing by
simply removing detergent siphoning tube from bottle.
Figure 13 — Insert the small filter into container
of cleaning solution.
Page 12
12
High Pressure Washer
How to Use the Brushes
Your pressure washer comes equipped with two
brushes including a broom brush and utility brush.
Broom Brush
The broom brush is a large soft bristle brush thats
great for applying detergent and loosening tough dirt
to clean floors, garages and driveways. You can apply
detergent or rinse with this brush.
To attach the broom brush to the gun:
Remove any accessories from the gun.
Attach the broom handle to the broom brush.
Attach extension to the broom handle.
Attach accessory adapter to the extension.
Attach the assembled brush to the gun.
Utility Brush
The utility brush is a soft bristle brush thats great for
applying cleaning solutions and loosening dirt. You
can use this brush to rinse or apply detergent.
To attach utility brush to the spray gun:
Remove any accessories attached to spray gun.
Attach utility brush to the extension (optional).
Attach the accessory adapter to the utility brush or
extension.
Attach assembled brush to the spray gun.
How to Use the Turbo Nozzle
The turbo nozzle spins the narrow high pressure
stream in a circular pattern to increase the area to be
cleaned.
Important: The turbo nozzle is very powerful. Make
sure the area to be cleaned or rinsed will not be damaged by the spray. The nozzle is powerful enough to
remove paint and cut holes at close range.
To attach the turbo nozzle to the spray gun:
Remove any accessories attached to the spray gun.
Attach the turbo nozzle to the spray gun.
Automatic Cool Down System
(Thermal Relief)
If you run the engine on your pressure washer for 3-5
minutes without pressing the trigger on the spray gun,
circulating water in the pump can reach a temperature
between 140145°F. When the water reaches this
temperature, the automatic cool down system
engages and cools the pump by discharging the
warm water onto the ground. This system prevents
internal damage to the pump.
GENERAC
Generac 1800PSI High Pressure Washer
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Generac 1800PSI High Pressure Washer
GENERAC
13
High Pressure Washer
GENERAL MAINTENANCE
RECOMMENDATIONS
The warranty of the high pressure washer does not
cover items that have been subjected to operator
abuse or negligence. To receive full value from the
warranty, operator must maintain high pressure
washer as instructed in this manual.
Some adjustments will need to be made periodically
to properly maintain your high pressure washer.
All adjustments in the Service and Adjustments sec-
tion of this manual should be made at least once
each season.
Once a year you should clean or replace the spark
plug and clean or replace the air filter and check the
gun and wand assembly for wear. A new spark plug
and clean air filter assure proper fuel-air mixture
and help your engine run better and last longer.
BEFORE EACH USE
Check engine oil level.
Check water inlet screen for damage.
Check high pressure hose for leaks.
Check detergent siphoning tube and filter for
damage.
Check gun and wand assembly for leaks.
PRESSURE WASHER
MAINTENANCE
Check and Clean Inlet Screen
Examine screen on the water inlet. Clean if the screen
is clogged or replace if screen is damaged.
Check High Pressure Hose
High pressure hose can develop leaks from wear,
kinking, or abuse. Inspect hose each time before using
it. Check for cuts, leaks, abrasions or bulging of cover,
damage or movement of couplings. If any of these
conditions exist, replace hose immediately.
DANGER: Water spraying from a leak is
capable of injecting material into skin.
Inspect hose each time before using it.
Never repair a high pressure hose.
Replace it with another hose that meets
the maximum pressure rating of your
pressure washer.
Check Detergent Siphoning Tube
Examine the filter on the detergent hose and clean if
clogged. Tube should fit tightly on barbed fitting.
Examine tube for leaks or tears. Replace the filter or
tube if either is damaged.
Check Gun and Wand
Examine hose connection to gun and make sure it is
secure. Test trigger by pressing it and making sure it
springs back into place when you release it. Put safety
latch in ON position and test trigger. You should not be
able to press trigger.
Purge Pump of Air and
Contaminants
To remove the air from the pump, follow these steps:
Set up the pressure washer as described in the
ASSEMBLY section and connect the water supply.
Remove the wand extension from the gun.
Pull the trigger on the gun and hold.
To remove the contaminants from the pump, follow
these steps:
Set up the pressure washer as described in the
ASSEMBLY section, and connect the water supply.
Remove the nozzle attachment from the gun.
Start the engine according to instructions in OPER-
ATION section.
Squeeze the trigger on the gun and hold.
When the water supply is steady and constant,
engage the safety latch and refasten the nozzle
attachment.
Cleaning Detergent Siphoning
Tube
If you have used the detergent siphoning tube you
must flush it with clean water before stopping the
engine.
Place detergent siphoning tube in a bucket full of
clean water.
Flush for five minutes.
Shut off the engine.
Important: Simply shutting OFF engine will not release
pressure in the system. When engine has shut down,
squeeze the trigger on the gun to relieve the pressure
in the hose.
Page 14
Nozzle Maintenance
If the adjustable nozzle becomes restricted or
clogged with foreign materials, such as dirt, excessive
pump pressure may develop. If this nozzle becomes
partially clogged, it can cause a pulsing sensation
during use. This generally is not a pump related
problem, but rather a clogged or partially restricted
adjustable nozzle.
If the adjustable nozzle becomes clogged or partially
restricted, immediately clean the nozzle with the kit
included with your pressure washer by following
these instructions:
Shut off the engine and turn off the water supply.
Separate the nozzle extension from the gun.
Adjust the nozzle extension to the stream position.
Remove nozzle from the end of the nozzle extension
(Figure 17) using a 2mm or 5/64 allen wrench (like
the one included in the kit).
Use the wire included in the kit (Figure 17) or a
small paper clip to free the foreign materials clogging or restricting the nozzle.
Remove additional debris by back flushing water
supply through nozzle extension (Figure 18). Back
flush between 30 to 60 seconds. Turn nozzle extension to stream spray and move nozzle from low to
high while flushing.
Figure 18 — Backflushing the nozzle.
Reinstall nozzle into the nozzle extension. DO NOT
over tighten.
Reconnect the nozzle extension to the gun.
Reconnect the water supply, turn on the water, and
start the engine.
Test the pressure washer by operating with nozzle
in the high and in the low position.
ENGINE MAINTENANCE
See the engine owners manual for instructions on
how to properly maintain the engine.
Figure 17 — Removing and cleaning nozzle.
Generac 1800PSI High Pressure Washer
GENERAC
14
High Pressure Washer
Page 15
GENERAC
Generac 1800PSI High Pressure Washer
15
High Pressure Washer
SERVICE AND
ADJUSTMENTS
See the engine Owners Manual for instructions on
how to properly service and adjust the engine.
PREPARING THE UNIT FOR
STORAGE
Water should not remain in the unit for long periods of
time. Sediments of minerals can deposit on pump
parts and freeze pump action. If you do not plan to
use the pressure washer for more than 30 days,
follow this procedure:
1.Flush detergent siphoning tube by placing the filter
into a pail of clean water while running pressure
washer with nozzle in low pressure mode. Flush for
five minutes.
2.Shut off the engine and let it cool, then remove all
hoses.
3.Place throttle lever in STOP position.
CAUTION: Be sure lever is in STOP
position before you continue. If you start
engine without proper water supply connected, you can damage pump.
4.Empty the pump of all pumped liquids by pulling
recoil handle about 6 times. This should remove
most of the liquid in the pump.
NOTE: To protect unit from freezing temperatures,
draw RV antifeeze (no alcohol) into pump by pouring
windshield washer fluid into a 3-foot section of garden
hose connected to inlet adapter and pulling recoil
handle twice.
5.Store in a clean, dry area.
STORING THE ENGINE
See the engine Owners manual for instructions on
how to properly store the engine.
Page 16
NOTES
16
High Pressure Washer
GENERAC
Generac 1800PSI High Pressure Washer
Page 17
Generac 1800PSI High Pressure Washer
GENERAC
NOTES
17
High Pressure Washer
Page 18
Generac 1800PSI High Pressure Washer
18
High Pressure Washer
TROUBLESHOOTING POINTS
GENERAC
Problem Cause Correction
Pump has following problems: 1. Nozzle in low pressure mode. 1. Pull nozzle backward for high
failure to produce pressure, erratic pressure mode.
pressure, chattering, loss of pressure, 2. Water inlet is blocked. 2. Clear inlet
low water volume. 3. Inadequate water supply. 3. Provide adequate water flow.
4. Inlet hose is kinked or leaking. 4. Straighten inlet hose, patch leak.
5. Clogged inlet hose strainer. 5. Check and clean inlet hose
strainer.
6. Water supply is over 140°F. 6. Provide cooler water supply.
7. Outlet hose is blocked or leaks. 7. Clear blocks in outlet hose.
8. Gun leaks. 8. Replace gun.
9. Nozzle is obstructed. 9. Clean nozzle.
10. Pump is faulty. 10. Contact Generac service facility.
Detergent fails to mix with spray. 1. Detergent siphoning tube 1. Insert detergent siphoning tube into
is not submerged. detergent.
2. Chemical filter is clogged. 2. Clean or replace filter/detergent
siphoning tube.
3. Nozzle is in high pressure mode. 3. Push nozzle forward for
low pressure mode.
Engine runs good at no-load but bogs Engine speed is too slow. Move throttle control to FAST .
when load is added. position. If engine still bogs down
contact Generac service facility.
Page 19
19
High Pressure Washer
GENERAC
Generac 1800PSI High Pressure Washer
PROBLEM CAUSE CORRECTION
Engine will not start; or starts 1. Low oil level. 1. Fill crankcase to proper level.
and runs rough. 2. Dirty air cleaner. 2. Clean or replace air cleaner.
3. Out of gasoline. 3. Fill fuel tank.
4. Stale gasoline. 4. Drain gas tank; fill with fresh fuel.
5. Spark plug wire not connected 5. Connect wire to spark plug.
to spark plug.
6. Bad spark plug. 6. Replace spark plug.
7. Water in gasoline. 7. Drain gas tank; fill with fresh fuel.
8. Overchoking. 8. Open choke fully and crank
engine.
9. Excessively rich fuel mixture. 9. Contact Generac service facility.
10. Intake valve stuck open or closed. 10. Contact Generac service facility.
11. Engine has lost compression. 11. Contact Generac service facility.
Engine shuts down during operation. 1. Out of gasoline. 1. Fill fuel tank.
2. Low oil level. 2. Fill crankcase to proper level.
Engine lacks power. Dirty air filter. Replace air filter.
Engine hunts or falters. Choke is opened too soon. Move choke to halfway position
until engine runs smoothly.
TROUBLESHOOTING POINTS
Page 20
20
High Pressure Washer
GENERAC
EXPLODED VIEW PRESSURE WASHER
Drawing No. B2307
Generac 1800PSI High Pressure Washer
20
Page 21
21
High Pressure Washer
REPAIR PARTS PRESSURE WASHER
Drawing No. B2307
GENERAC
Generac 1800PSI High Pressure Washer
1 BB2058 BASE, VSPW 1
2 B1932 DECAL, Instructions 1
3 20566 DECAL, 1-800 Number 1
4 48031G CLAMP, Hose 3/16 1
5 B2192 DECAL, GENERAC 1
6 B1730 BOLT, Eye 1
7 50190 WASHER, M8 Flat 2
8 B2309 DECAL, Logo 1800 PSI 1
9 B1210 CARD, Starting Instructions 1
11 30809 GROMMET, Chem Hose 1
12 B2335 WAND, Turbo 1
13 B1631B BILLBOARD, Plastic 1
14 B1760 TIRE, 3.5 X 10 Black Mag 2
15 75402 PUSHNUT, 1/2 2
16 52858 NUT, M8 Locking Flange 2
17 A1408 CAP, Garden Hose Inlet 1
18 21424 CONNECTOR, Garden Hose 1
19 88185 BRUSH, Utility 1
20 27007 MOUNT, Rubber Foot 2
21 B1214 HHCS, M8 X 1.25 X 45 Long 2
22 B1735 STUD, Double Ended 3
23 B1880 NUT, with Washer 3
24 A1040B HOSE, Chemical 1
25 A1041 FILTER, Chemical Hose 1
26 B1469 ENGINE, TECUMSEH 6 HP ELITE LE 1
27 98300 SEAL, Engine Donut 1
28 88934 BRUSH, Extension 1
29 88935 ADAPTER, Brush Extension 1
30 B1262A PUMP, GPW-EG Assembly 1
31 97100 CAP, High Pressure 1
32 88056 DECAL, Data 1
33 79552 OVERLAMINATE 1
34 BB1945 HANDLE, VS PW 1
35 97178 KNOB, PW Handle 2
36 95597 BRUSH, Broom 1
37 95598 HANDLE, Broom 1
38 31669 BOLT, 1/4-20 X 1.75 Carriage 1
39 B1969 HOSE, 1/4 X 25 1
40 97566 HANG TAG, Nozzle 1
41 B1867E WAND, Adjustable Nozzle 1
42 B1861 GUN, High Pressure 1
43 B1460 CAP, Vinyl Black 3
44 B1953 WIREFORM 1
ITEM PART NO. DESCRIPTION. QTY.
Page 22
22
High Pressure Washer
GENERAC
Generac 1800PSI High Pressure Washer
Drawing No. B2023
EXPLODED VIEW PUMP
Page 23
23
High Pressure Washer
GENERAC
Generac 1800PSI High Pressure Washer
REPAIR PARTS PUMP
23
Drawing No. B2023
ITEM PART NO. DESCRIPTION QTY
1 96795 SLEEVE, RUBBER GROMMET SPACER 3
2 21640 ASSY., CAGE NEEDLE BEARING 45 X 65 1
3 21641 WASHER, BRG. DIA. 45 x 65 x 1T ( 1
4 21642 WASHER, BRG. DIA. 36 x 65 x 6T [SPECIAL] 1
5 93680 SEAL, OIL PISTON DIA. 15 3
6 97828 SPRING, PISTON RETURN EG 3
7 93667 SEAL, U-CLIP 3
8 98304 CAM, AXIAL 5.6mm w/INSERT 1
9 98227 ADAPTER, ENGINE 1
10 20110 HOUSING, PISTON AND UNLOADER 1
11 97830 RETAINER, PISTON SPRING 3
12 97831 SPACER, PILOT 3
13 97832 PISTON, DIA. 15-65 LONG 3
14 A1111B HEAD, PUMP 1
15 57018 BEARING, BALL RADIAL 1
16 21429 BUSHING, RUBBER 6
17 97835 O RING, HOUSING SEAL 1
18 97837 O RING, HI-PRESSURE TRANSFER 1
19 97838 ASSY, CHECK VALVE INLET 3
20 97839 ASSY, CHECK VALVE OUTLET 3
21 97840 O RING, INLET PORT CAP 3
23 97841 CAP, INLET PORT 3
24 97842 SEAT, UNLOADER 1
25 97843 O RING, UNLOADER VENTURI 1
26 B1253 PISTON, UNLOADER 1
27 97845 SEAL, UNLOADER PARBACK 2
28 A2731 SPRING, UNLOADER 1
29 97847 O RING, UNLOADER CAP 1
30 A2730 CAP, UNLOADER 1
31 21424 GARDEN HOSE CONNECTOR 1
32 A1575 BARB, HOSE WITH NYLON INSERT 1
33 96137 PLUG, 1/8 NPT [WITH SEALANT] 1
34 95379 BALL, DIA. 5.5 CHEMICAL INJECTOR 1
35 95380 SPRING, CHEMICAL INJECTOR 1
36 20631 VENTURI, CHEMICAL INJECTOR 1
37 97934 O RING, CHECK VALVE INLET 3
39 93873 LOCK WASHER, M6 RIBBED 7
40 40946 SOCKET HEAD CAPSCREW M6-1.0 x 35mm 4
41 97851 O RING PISTON HOUSING 3
42 97962 SOCKET HEAD CAPSCREW, M6-1.0 x 25mm 3
43 21783 THERMAL RELIEF 1
44 20876 .5 OZ. SEALANT, THREAD LOCKTITE 545 O
45 B1077 O RING VENTURI 1
Page 24
Generac 1800PSI High Pressure Washer
GENERAC
LIMITED PRESSURE WASHER WARRANTIES
(includes Master Contractor)
GENERAC warrants to the original retail purchaser, the pressure washer manufactured by GENERAC to be
free from defects in material and workmanship for the period(s) set forth below from the date of original purchase. This warranty is not transferable. The term original purchaser means the person for whom the
pressure washer is originally purchased.
Warranty Schedules
Electric Power Washer 1 year (does not apply to commercial or rental operations)
CONSUMER* COMMERCIAL*
Generac GN-Series Engine-driven Engine: 2 years 1 year
Power Washer (2nd year parts only)
Pump: 1 year 90 days
All Other Engine-driven Engine: Warranted solely by Warranted solely by
Power Washers Engine Manufacturer Engine Manufacturer
Pump: 1 year 90 days
* NOTE: For the purpose of this warranty consumer use means personal residential household use
by original purchaser. Commercial Use means all other uses, including rental, construction, commercial and income producing purposes. Once a pressure washer has experienced commercial use,
it shall thereafter be considered a commercial use pressure washer for the purposes of this warranty.
During said warranty period, GENERAC will, at its option, repair or replace any part which, upon examination
by GENERAC or GENERAC Authorized Dealers, is found to be defective under normal use and service**.
All transportation costs under warranty, including return to the factory if necessary, are to be borne by the purchaser and prepaid by the purchaser.
** NORMAL WEAR: As with all mechanical devices, the GN-Series engines need periodic parts service and replacement to perform well. This warranty will not cover repair when normal use has
exhausted the life of a part or an engine.
THIS WARRANTY DOES NOT INCLUDE: Used products and demonstration equipment. Parts such as
GUNS, HOSES, WANDS, NOZZLES or other wear items such as quick couplers, oil, gauges, belts, O-rings,
filters, pump packing, etc. Pumps which have been run without water supplied. Damage or malfunctions
resulting from: accidents, abuse, modifications, alterations, or improper servicing. Freezing or chemical deterioration. Normal maintenance such as adjustments, fuel system cleaning and obstruction (due to chemical,
dirt, carbon or lime, etc.).
THIS WARRANTY IS IN PLACE OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, SPECIFICALLY,
GENERAC MAKES NO OTHER WARRANTIES AS TO MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The duration of any implied warranties which cannot be disclaimed is limited to the time
period as specified in the express warranty. LIABILITY FOR CONSEQUENTIAL, INCIDENTAL, OR SPECIAL
DAMAGES UNDER ANY AND ALL WARRANTIES IS EXCLUDED, EVEN IF SUCH DAMAGES ARE A
DIRECT RESULT OF GENERACs NEGLIGENCE. Some states do not allow limitations on how long an
implied warranty lasts, or the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not apply to you. This warranty gives you specific legal rights and you may also
have other rights, which vary from state to state.
For service, see your nearest GENERAC authorized warranty service facility or call 1-800-333-1322. Warranty service can be performed only by a GENERAC authorized service facility. This warranty will not apply
to service at any other facility. At the time of requesting warranty service, evidence of original purchase date
must be presented.
GENERAC CORPORATION
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