Page 1
2250PSI
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 11 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. 10421 (2250 PSI High Pressure Washer) Manual No. B2137 Revision 2 (4/13/98)
Page 2
CAUTION: 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.
2
High Pressure Washer
Generac 2250PSI High Pressure Washer
GENERAC
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 for ice formation.
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.
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 a mask to be 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 and 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 gun trigger 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 severe burns may occur.
Operate and store this unit on a stable surface.
The high pressure hose can develop leaks from wear, kinking,
abuse, etc. Water spraying from a leak is capable of injecting mate-
rial into skin. Inspect the hose each time before use. Check all
hoses for cuts, leaks, abrasions or bulging of cover, or damage
or movement of couplings. If any of these conditions exist, replace
hose immediately. Never repair the high pressure hose. Replace
it with another hose that meets minimum pressure rating of your
pressure 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::
Page 3
Generac 2250PSI High Pressure Washer
GENERAC
3
High Pressure Washer
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 . . . . 2250 psi
Flow Rate . . . . . . . . . 2.22 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 . . . . . . Briggs & Stratton Intek
Rated Horsepower . . 6.0
Displacement . . . . . . 190cc
Spark Plug
Type . . . . . . . . RC-12YC
Set Gap To: . . 0.030 inch (0.76mm)
Gasoline Capacity . . 4.2 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 1042-1
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.
Page 4
4
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 2250PSI High Pressure Washer
GENERAC
Pump Develops high pressure.
Recoil Starter Used for starting the engine man-
ually.
Spray Gun Controls the application of water onto
cleaning surface with trigger device. Includes safety
latch.
Adjustable Nozzle Extension You must attach
this to the spray gun to provide high pressure
stream. The adjustable nozzle allows you to adjust
the spray pattern which, in turn, adjusts the force of
spray.
Dual Element Air Filter Filter element limits the
amount of dirt and dust that gets in the engine.
Water Inlet Connection for garden hose.
High Pressure Outlet Connection for high pres-
sure hose.
High Pressure Hose Connect one end to water
pump and the other end to spray gun.
Goggles Always use the enclosed goggles or
other eye protection when running your pressure
washer.
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.
Pressure Control Knob Varies the pressure of
the high pressure spray.
Oil Fill Cap Fill engine with oil here.
Gas Tank Fill tank with regular unleaded
gasoline.
Spray Gun
Adjustable Nozzle
Extension
High Pressure Hose
Recoil Starter
Goggles
Gas Tank
Water Inlet
Pressure Control Knob
Pump equipped with
Automatic Cool Down System
High Pressure Outlet
Dual Element Air Filter
Oil Fill Cap
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 the exception of those parts left
unassembled for shipping purposes.
REMOVE PRESSURE
WASHER FROM CARTON
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
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 the high pressure hose and spray gun.
Connect the 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).
Note: It may be necessary to move the handle supports from side to side in order to align the handle so
it will slide over the handle supports.
Generac 2250PSI 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
bottom of the
handle are
aligned with the
holes in the top
of the handle
supports
Handle
Handle
Support
Page 6
Generac 2250PSI High Pressure Washer
AASSSSEEMMBBLLYY
GENERAC
6
High Pressure Washer
Insert the carriage bolts through the aligned holes
on the handle and attach the plastic knobs. Tighten
the knobs by hand (Figure 2).
Insert the wire support with the longer arm positioned
on the left. From this view (from rear of unit) 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 rated SAE 30 weight.
Select the oils viscosity grade according to your
expected operating temperature. Do Not Use SAE
10W40 Oil. Do not use the upper grey oil fill cap.
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 yellow oil fill
cap (Figure 4). Do not use the upper grey oil fill
cap.
Fill with recommended oil. Oil should be full to
overflowing. (Approximately 21 ounces).
Install oil fill cap, 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.
DO NOT operate or refuel engine with
spark plug access hole cover removed.
Allow engine to cool 2 minutes before
refueling.
Figure 3 — Fit wire form on handle.
Figure 4 — Add oil to engine crankcase. Do not
attempt to start engine without
adding oil.
Yellow Oil
Fill Cap
Figure 2 — Insert the carriage bolt and hook
and attach the knobs.
colder 32°F warmer
5W30 SAE 30
Page 7
Generac 2250PSI High Pressure Washer
GENERAC
AA
SSSSEEMMBBLL
YY
7
High Pressure Washer
The manufacturer recommends fresh, clean unleaded
automotive gasoline with a minimum of 85 octane.
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 (over 30 days).
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.
Note: Some fuels, called oxygenated or reformulated
gasolines, are gasoline blended with alcohols or
ethers. Excessive amounts of these blends can
damage the fuel system or cause performance problems. If any undesirable operating systems occur, use
gasoline with a lower percentage of alcohol or ether.
Connect Hose and Water
Supply to Pump
IMPORTANT: You must assemble spray gun 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 outlet on the pump (Figure 7). Tighten by
hand.
Before you connect your garden hose to the water
inlet, inspect the Inlet Screen (see Figure 8). Clean
the screen if it contains debris or have it replaced if
damaged. Do not run the pressure washer if the
inlet screen is damaged.
Connect garden hose to water inlet. Tighten by
hand (Figure 8).
Figure 7 — Connect high pressure hose to
pump.
Figure 6 — Connect high pressure hose
to spray gun.
Figure 5 — Add gasoline to fuel tank.
Gas Cap
Connect High Pressure
Hose Here
Connect High
Pressure Hose
Here
Page 8
Generac 2250PSI High Pressure Washer
GENERAC
AASSSSEEMMBBLLYY
8
High Pressure Washer
Turn ON the water (open valve completely).
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.
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.
Figure 8 — Connect the garden hose to water
inlet and turn ON the water.
Check Screen
for Damage
Page 9
Generac 2250PSI 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.
This pressure washer requires a water source that
flows at least 2 gallons per minute. Do not attempt
to siphon water from a non-pressurized container. Place the pressure washer close enough to
an outside water source so that no more than 50' of
garden hose is needed.
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 the water on all the
way.
IMPORTANT: Do not run pump without the water
supply connected and turned on. You must follow this
caution or the pump will be damaged.
Set choke control to Choke position. Note: This
is a multi-position choke.
Move the throttle control to the Fast position.
Note: For a warm engine, be sure the Throttle Con-
trol Lever is in the Fast position and the Choke
Lever is in the Run position.
Turn the fuel shutoff valve to the On position.
Move the stop control to the On position.
Squeeze the trigger on the spray gun to relieve air
pressure caused by turning ON the water. Water
will spew out the gun in a thin stream. Continue to
hold trigger until you have a steady stream of water
and no air remains.This will make it easier to pull
start the engine. Release the trigger.
Apply the safety latch to the spray gun trigger
(Figure 10).
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 in the Fast
position when operating the pressure washer.
When the engine starts, gradually move the choke
control from one position to the next until it is in the
Run position.
If after 3 pulls the engine fails to start, disengage the
spray gun safety latch, squeeze the trigger to relieve
water pressure, re-engage the spray gun safety latch,
move the choke control to the Run position and pull
the recoil starter handle rapidly (Max. 3 pulls).
How to Stop Your Pressure
Washer
Important: Do Not move the choke control to
Choke position to stop the engine. Backfire or
engine damage may occur.
Move the throttle control to the Idle or Slow posi-
tion.
Wait for the engine to idle down.
Move the stop control to the Off position.
Close the fuel shutoff valve.
Squeeze trigger on the spray gun to relieve
pressure in the hose. Simply shutting off the
engine will not release pressure in the system.
Note: A small amount of water will squirt out when
you release the pressure.
Figure 10 — Safety Latch.
Safety Latch ON
Page 10
Generac 2250PSI High Pressure Washer
GENERAC
10
High Pressure Washer
How to Use the Adjustable
Nozzle and Adjust Pressure
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 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.
Located on the side of the pump is a pressure con-
trol knob. You can increase and decrease the
pressure of the spray by turning the knob clockwise
or counterclockwise respectively (Figure 12).
Point the nozzle toward the ground and press the
trigger to test the pattern.
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 sur-
face.
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 — Pressure control knob.
Pressure Control
Knob
Page 11
Generac 2250PSI 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 (Figure 13).
Place small filter end of the chemical injection 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
engine.
Apply detergent to a dry surface, starting from the
bottom and working up to avoid streaking.
Allow the detergent to soak in for 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 plastic chemical
injection 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 backward 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 a 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 the chemical injection tube from the
bottle.
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 base of the unit. This system
prevents internal damage to the pump.
Figure 13 — Insert the small filter into container
of cleaning solution.
Page 12
Generac 2250PSI High Pressure Washer
GENERAC
12
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 periodi-
cally to properly maintain your high pressure
washer.
All adjustments in the Service and Adjustments
section of the engine owners 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 chemical injection 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 Chemical Injection Tube
Examine the filter on the chemical injection tube and
clean if clogged. The 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 Nozzle Extension
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 nozzle extension from the gun.
Squeeze the trigger on the gun and hold.
To remove any 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 extension from the spray gun.
Start the engine according to instructions in OPER-
ATION section.
Squeeze the trigger on the spray gun and hold.
When the water supply is steady and constant,
engage the safety latch and refasten the nozzle
extension.
Page 13
Cleaning Chemical Injection Tube
If you have used the chemical injection tube you must
flush it with clean water before stopping the engine.
Place the small filter end of the chemical injection
tube in a bucket of clean water.
Slide the adjustable nozzle forward.
Squeeze the spray gun trigger for five minutes to
flush the chemical injection tube.
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.
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 wand 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 clog-
ging or restricting the nozzle.
Figure 17 — Removing and cleaning nozzle.
Remove additional debris by back-flushing water
supply through nozzle extension (Figure 18). Backflush between 30 to 60 seconds. Turn nozzle
extension to stream spray and move nozzle forward
and backward while flushing.
Figure 18 — Backflushing the nozzle.
Reinstall nozzle into the nozzle extension. DO NOT
overtighten.
Reconnect the nozzle extension to the spray 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.
SERVICE AND
ADJUSTMENTS
See the engine Owners Manual for instructions on
how to properly service and adjust the engine.
13
High Pressure Washer
Generac 2250PSI High Pressure Washer
GENERAC
Page 14
14
High Pressure Washer
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 chemical injection tube by placing the injector
filter into a pail of clean water while running pressure washer and squeezing the spray gun trigger
with the adjustable 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 the 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 windshield washer fluid into pump by pouring
RV Antifreeze fluid (antifreeze without any alcohol)
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.
GENERAC
Generac 2250PSI High Pressure Washer
Page 15
NOTES
15
High Pressure Washer
GENERAC
Generac 2250PSI High Pressure Washer
Page 16
TROUBLESHOOTING POINTS
Generac 2250PSI High Pressure Washer
GENERAC
16
High Pressure Washer
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. Clear nozzle.
10. Pump is faulty. 10. Contact Generac service facility.
Detergent fails to mix with spray. 1. Chemical injection tube is not submerged. 1. Insert chemical injection tube into
detergent.
2. Chemical injection tube filter is clogged. 2. Clean or replace filter/chemical
injection tube.
3. Nozzle is in high pressure mode. 3. Push nozzle forward for
low pressure mode.
Engine runs well 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 17
TROUBLESHOOTING POINTS
17
High Pressure Washer
GENERAC
Generac 2250PSI 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.
Page 18
GENERAC
EXPLODED VIEW PRESSURE WASHER
Drawing No. B2138
Generac 2250PSI High Pressure Washer
18
High Pressure Washer
18
Page 19
REPAIR PARTS PRESSURE WASHER
Drawing No. B2138
GENERAC
19
High Pressure Washer
Generac 2250PSI High Pressure Washer
1 A1040D 1 HOSE, 4-1/2 Chemical Clear
2 A1041 1 FILTER, Chemical Hose
3 70453 1 TAG, Warning Oil
4 97178 2 KNOB, Handle 1/4 - 20 PW
5 31669 2 BOLT, 1/4 - 20 x 1-3/4 Carriage
6 21424 1 CONNECTOR, Garden Hose
7 99583 8 NUT, Flange Lock 5/16-28
8 B1982 1 BUMPER
9 97054 1 TAG, Pres. Adjust
10 B1288 1 TAG, PW Breather Cap
11 B2718 1 CLAMP, Hose 7/16" Dia.
13 32713 1 SCREW, Taptite #10 - 32 x 5/8" Lg
12 97566 1 TAG, Nozzle
14 45771 8 NUT, M8 - 1.25 Hex
15 22129 8 LOCKWASHER, M8
16 21217 2 MOUNT, Rubber Shock
17 B1236F NOZZLE, Replacement 1.25 mm
18 97100 1 CAP, H.P. Adaptor
19 97098 1 CAP, Garden Hose Inlet
20 B2043 7 BOLT, 5/16 - 18 x 1-3/4" Carriage
21 N/A 1 ASSEMBLY, Pump
(see pump exploded view)
22 B1827 1 ENGINE
23 B1983 1 HANDLE
24 B1631A 1 BILLBOARD, Plastic
25 B1932 1 DECAL, Instructions
26 B1981 2 SUPPORT, Handle
27 B2192 1 DECAL, Generac
28 B1760 2 ASSEMBLY, 10" Tire & Wheel
29 75402 2 PUSHNUT, .50 Dia.
30 AB1770 1 BASE
31 52858 2 NUT, M8 1.25 Locking
32 42909 2 HHCS, M8 1.25 x 30
33 50190 2 WASHER, M8 Flat
34 27007 2 MOUNT, Donut Type Vibration
35 20566 1 DECAL, Generac #1-800
36 B2150 1 HOOK , Gun
37 B2146 1 DECAL, Logo
38 52857 2 NUT, M6 1.0 Locking
39 20707 1 BRACKET, Pump Support
40 21216 2 MOUNT, Rubber Shock
41 38750 2 HHCS, M6 1.0 x 30
42 B1969 1 HOSE, High Pressure
43 87815 1 GOGGLES, Saftey
44 B1867F 1 WAND
45 B1861 1 GUN, High Pressure
46 B2203 1 KIT, Handle Fastening
47 B2163 1 KIT, Cleaning
48 B1460 2 CAP, Vinyl (black)
49 B2168 1 HANGER, Hose, Gun, Jug
65 B2516 1 CAP, Vinyl (black)
66 95441 1 SPACER, Engine Pilot (not
shown)
Item Part # Qty Description
Item Part # Qty Description
Page 20
EXPLODED VIEW PUMP
GENERAC
Generac 2250PSI High Pressure Washer
Drawing No. B1962E
20
High Pressure Washer
Page 21
REPAIR PARTS PUMP
GENERAC
21
High Pressure Washer
Generac 2250PSI High Pressure Washer
21
Drawing No. B1962E
Item Part # Qty. Description
Item Part # Qty. Description
1 93871 1 GASKET, Engine Adapter
2 96430A 1 ADAPTER, Engine
3 96542 1 BEARING, Eng. Adptr. Roller
Thrust 4 x 4
4 97675 1 C - RING, Cam Retainer
5 97570 1 WASHER, Thrust
6 95524 1 WASHER, Retainer
7 92479 4 LOCKWASHER, M8 Ribbed
8 95531 4 BOLT, SHC 5/16 - 24 x 3/4" Lg
9 95435 1 ADAPTER, Engine Shaft 3/4"
10 21277V 1 CAM, Axial 7.5 Lift
11 97606 1 BEARING, Axial Cam Roller
Thrust 5.5 x 4
12 93790 1 O RING, Crankcase 113.97 x
119.21 x 2.62
13 97568A 1 CRANKCASE, Pump
14 96400 3 SPRING, Piston Return
15 99 427 3 ASSEMBLY, Ceramic Piston & Cap
16 94944 3 SHOE, Piston Pivot
17 99735 1 ASSEMBLY, Breather
18 93680 3 SEAL, OiI Piston
19 93668 3 SPACER, Pilot
20 93667 3 SEAL, U - Cup ELF
21 93652 1 SPRING, Thermal Relief Actuator
22 95416 1 PISTON, Thermal Relief Actuator
23 93876 1 O RING, Thermal Relief 2.9 x
6.5 x 1.78
24 A1320 1 SPACER, Inlet Plate
25 93873 6 LOCKWASHER, M6 Ribbed
26 40945 6 SCREW, SHC M6 x 1.0 x 20 mm Lg
27 A2069 1 GASKET, Head
28 A2062 3 SEAT, Check Valve Inlet
29 A2060 6 POPPET, Check Valve
30 97931 3 CAGE, Check Valve Inlet
31 B2640 6 O RING, Chk Valve 12.4 x 15.96 x
1.78
32 97929 6 SPRING, Check Valve Outlet
33 97843 1 O RING, 9.25 x 12.81 x 1.78
34 A2017 2 PAR -BACK, Backup Ring
35 A1719 1 PIN, 2.0 Dia. Spindle
36 A1711 1 SPINDLE, Pressure Regulator
37 93656 1 O RING, Spindle
1/4 x 3/8 x 1/16 cs
38 A3829 1 O RING, Retainer
Nut 14 x 17.56 x 1.78
39 A1712 1 NUT, Retainer - Spindle
40 A1716 1 SPRING, Unloader
41 A2016 1 PAR-BACK, Backup Ring
42 A2039 1 HANDLE, Unloader
43 A2013 6 BOLT, Head M8 x 1.25 x 70mm Lg
44 97840 3 O RING, Chk Valve Cap
15.6 x 19.16 x 1.78
45 97841 3 CAP, Outlet Port
46 20002 3 CAGE, Check Valve Outlet
47 A3805 1 O RING, Venturi
10.82 x 14.38 x 1.78
48 A2217 3 SEAT, Check Valve Outlet
49 A1318 1 CYLINDER, Head
50 B1758 1 PLUG, Button M8 x 1.25 x 8 mm
51 96053 3 SEAL, High Pressure
52 96015 3 RING, Bearing
53 A1717 1 MAGNET, Ball Deflector
54 B1757 4 PLUG, Button M6 x 1.0 x 8 mm
55 A1718 1 SET SCREW, M8 - 1.25 x 8 mm
56 93644 1 ACTUATOR, Thermal Relief
57 95380 1 SPRING, Chemical Injector
58 95379 1 BALL, 5.5 dia. Chemical Injector
59 A1575 1 BARB HOSE, Brass with
Nylon Insert
60 97855 1 O RING, Ball Seat
6.5 x 10.5 x 2 cs
61 A1713 1 SEAT, Ball Unloader
62 A2015 1 BALL, Stainless Steel 9/32 Dia.
63 A2503 1 SEAT, Trapped Line Pressure
64 A2756 1 VALVE, Shuttle Piston
65 89138 1 SPRING, Check Valve
66 21123 1 O RING, 3.68 x 7.24 x 1.78 cs
67 A1714 1 VENTURI, Chemical
68 B2236 1 LOCKNUT, M6 x 1.0 Nylon
69 B2241 1 CAP, Plastic
73 B2665 6 WASHER
74 95441 1 PILOT, Engine
Page 22
NOTES
22
High Pressure Washer
GENERAC
Generac 2250PSI High Pressure Washer
Page 23
NOTES
23
High Pressure Washer
GENERAC
Generac 2250PSI High Pressure Washer
Page 24
Generac 2250PSI High Pressure Washer
GENERAC
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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