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 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. 11950 (1800 PSI High Pressure Washer) Manual No. B2808 Revision 1 (6/9/98)
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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 Generac
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.
WARNING:
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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
Responsibilities 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 . . . . . . Honda GC 135
Rated Horsepower . . 4.0
Displacement . . . . . . 135cc
Spark Plug
Type . . . . . . . . NGK:BPR6ES
Set Gap To: . . 028-.031 inch (.7-.8mm)
Gasoline Capacity . . 1.8 U.S. quarts
Oil . . . . . . . . . . . . . . . SAE 10W30
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 Honda service dealer.
Model Number 1195-0
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
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.
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.
Chemical Injection TubeUsed to siphon chemical
from the detergent container to the pump.
Choke Rod Prepares a cold engine for starting.
Goggles Always use the enclosed goggles or other
eye protection when running your pressure washer.
High Pressure Hose Connect one end to water
pump and the other end to spray wand.
High Pressure Outlet Connection for high pressure
hose.
Oil FillOil input area.
Pump Develops high pressure.
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.
Throttle LeverSets engine in starting mode for recoil
starter and stops a running engine.
Water Inlet Connection for garden hose.
High Pressure Hose
Adjustable Nozzle
Goggles
Choke Rod
High Pressure Outlet
Pump equipped with
Automatic Cool Down
System
Spray Gun
Water Inlet
Oil Fill
Recoil Starter
Throttle Lever
Air Cleaner
Chemical Injection Tube
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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 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
High Pressure Hose
Parts Box (which includes the following):
Wireform
Goggles
Nozzle Cleaning Kit
Owners Manual
Engine Manual
Spray Gun
Nozzle Extension
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:
Unfold the handle and attach the wire form that
holds high pressure hose and spray gun.
Connect the high pressure hose to the spray gun
and the pump and connect the water supply to the
pump.
Add oil to the engine crankcase.
Add fuel to the fuel tank.
Secure Handle and Wire Form
Lift the handle upward and allow the locking caps to
slide over the bottom part of the handle to secure it
in place. (Figure 1).
Insert the wire form into the handle with the longer arm
positioned on the left. From this view the hook should
resemble a J
(Figure 2).
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.
Generac 1800PSI High Pressure Washer
AA
SSSSEEMMBBLL
YY
GENERAC
Figure 1 — Lift the handle into an upright
position.
Lift the handle
to an upright
position and
slide the
locking caps
into place
Figure 2 — Fit wire form on handle.
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Generac 1800PSI High Pressure Washer
AASSSSEEMMBBLLYY
GENERAC
6
High Pressure Washer
Note: When adding oil to the engine crankcase, use
only high quality detergent oil rated with API service
classification SF or SG rated SAE 10W30 weight.
Do Not Use SAE 10W40 Oil.
Place the pressure washer on a level surface.
Clean the area around oil fill and remove the oil dip-
stick (Figure 3).
Wipe the dipstick clean.
Insert and remove the dipstick without screwing it
into the filler neck. Check the oil level shown on the
dipstick.
If the oil level is low, fill to the edge of the oil filler
hole with the recommended oil. DO NOT OVERFILL.
Reinstall the 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.
Clean the area around the fuel fill cap, remove the
cap (Figure 4).
Add UNLEADED regular gasoline, slowly, to fuel
tank. Use a funnel to prevent spillage.
Install the fuel cap and wipe up any spilled gasoline.
Connect Hose and Water
Supply to Pump
IMPORTANT: You must assemble the wand and
attach all hoses before you start the engine. Starting
engine without all hoses connected and water supplied will damage the pump.
Uncoil the high pressure hose and attach one end
of the hose to the base of the spray gun. (Figure 5).
Tighten by hand.
Attach the other end of the high pressure hose to
the high pressure fitting on the pump (Figure 6).
Tighten by hand.
Figure 3 — Add oil to engine crankcase. Do not
attempt to start engine without
adding oil.
Figure 4 — Add gasoline to fuel tank.
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Generac 1800PSI High Pressure Washer
GENERAC
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High Pressure Washer
Before you connect your garden hose to the water
inlet, inspect the Inlet Screen (Figure 7). 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 the garden hose to the water inlet. Tighten
by hand (Figure 7).
Turn ON the water.
Squeeze the trigger on the gun to purge the pump
system of air and impurities.
CAUTION: Before starting the pressure
washer, be sure you are wearing adequate eye protection.
Attach the nozzle extension to the spray gun.
Tighten By Hand (Figure 8).
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 the proper level in
the engine crankcase before trying to start the pres-
sure washer.
Add the proper gasoline to fuel tank.
Provide a proper water supply (not to exceed
140°F).
Be sure to read the Safety Rules and Operation
sections before using the pressure washer.
Figure 6 — Connect high pressure hose to
pump.
Figure 5 — Connect high pressure hose
to spray gun.
Connect High Pressure
Hose Here
Figure 7 — Connect the garden hose to water
inlet and turn ON the water.
Inspect inlet
screen, do not
use if damaged, clean if
dirty
Figure 8 — Connect nozzle extension to spray
gun.
High Pressure Hose
Connection
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Generac 1800PSI High Pressure Washer
GENERAC
8
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.
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
Preparing the Pressure Washer for First Use for
illustrations.
Connect the garden hose to the water inlet on the
pressure washer pump and turn on the water.
IMPORTANT: Do not run the pump without the water
supply connected and turned on. You must follow this
caution or the pump will be damaged.
Pull the Choke to the CLOSED position (full choke)
(Figure 9).
Move the Throttle Control Lever to the Fast
position (Figure 10).
Note: For a warm engine, be sure the Choke is in the
OPEN position (no choke).
Squeeze the trigger on the spray gun (make sure
the nozzle is in low pressure mode) to relieve the
air pressure caused by turning ON the water.
Water will spew out of the gun in a thin stream.
Hold the trigger until a steady stream of water
appears. This will make it easier to pull start the
engine. Release the trigger.
Apply the safety latch to the spray gun trigger
Grasp the rope handle and pull slowly until you feel
some resistance. Then pull the cord rapidly to over-
come compression, prevent kickback and start the
engine. Let the rope return to the starter slowly.
Note: Always keep the Throttle Control Lever in the
Fast position when operating the pressure washer.
If the engine fails to start repeat above steps.
If the choke was pulled to the CLOSED position to
start the engine, slowly push it to the OPEN position
as soon as the engine warms up enough to run
smoothly.
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 9 — Choke positions.
Figure 10 — Throttle control positions.
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Generac 1800PSI High Pressure Washer
GENERAC
9
High Pressure Washer
How to Use the Adjustable
Nozzle
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 the spray nozzle
between 8 to 24 inches away from the cleaning surface.
If you get the spray nozzle too close, especially
using high pressure mode, you may damage the
cleaning surface.
Do not get closer than 8 inches when cleaning tires.
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.
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.
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Generac 1800PSI High Pressure Washer
GENERAC
10
High Pressure Washer
To apply detergent follow these steps:
Review the use of adjustable nozzles.
Prepare the detergent solution as required by the
job.
Hang the detergent solution on the hook of the
wireform on the handle as shown in Figure 13.
Place the small filter of the clear, detergent siphon-
ing tube into the detergent container.
Slide the adjustable nozzle forward to low pressure
mode.
Note: Detergent cannot be applied with the nozzle in
high pressure position.
IMPORTANT: Detergent cannot be applied without
the water source turned on.
Make sure the garden hose is connected to the
water inlet. Check that the high pressure hose is
connected to the spray gun and the pump (see
HOW TO USE YOUR PRESSURE WASHER), and
start the engine.
Apply the 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. Do not allow the detergent to dry
on. This will prevent streaking.
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.
Figure 12 — Test the spray pattern.
Figure 13 — Insert the small filter into container
of cleaning solution.
Page 11
Generac 1800PSI High Pressure Washer
GENERAC
11
High Pressure Washer
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 the nozzle forward to high pressure and wait
for the 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 the top of the 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.
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.
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High Pressure Washer
Generac 1800PSI High Pressure Washer
GENERAC
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 the full value from the
warranty, the operator must maintain the 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 the screen on the water inlet. Clean it if the
screen is clogged or replace it if screen is damaged.
Check High Pressure Hose
The high pressure hose can develop leaks from wear,
kinking, or abuse. Inspect the 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 the 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. The tube should fit tightly on the barbed fitting. Examine the tube for leaks or tears. Replace the
filter or tube if either is damaged.
Check Gun and Wand
Examine the hose connection to the gun and make
sure it is secure. Test the trigger by pressing it and
making sure it springs back into place when you
release it. Put the safety latch in the ON position and
test the trigger. You should not be able to press the
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
PREPARING THE PRESSURE WASHER FOR
FIRST USE 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
HOW TO USE YOUR PRESSURE WASHER sec-
tion, 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 the detergent siphoning tube in a bucket full
of clean water.
Flush for 1-2 minutes.
Shut off the engine.
Important: Simply shutting OFF engine will not release
pressure in the system. When the engine has shut down,
squeeze the trigger on the gun to relieve the pressure
in the hose.
Page 13
13
High Pressure Washer
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 the nozzle from the end of the nozzle exten-
sion (Figure 14) using a 2mm or 5/64 allen wrench
(like the one included in the kit).
Use the wire included in the kit (Figure 14) or a
small paper clip to free the foreign materials clogging or restricting the nozzle.
Remove additional debris by back flushing the
water supply through the nozzle extension (Figure
15). Back flush between 30 to 60 seconds. Turn the
nozzle extension to stream spray and move the
nozzle from low to high while flushing.
Figure 15 — Backflushing the nozzle.
Reinstall the 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 14 — Removing and cleaning nozzle.
Generac 1800PSI High Pressure Washer
GENERAC
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High Pressure Washer
GENERAC
Generac 1800PSI 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
one to two minutes.
2.Shut off the engine and let it cool, then remove all
hoses.
3.Place the 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 the
recoil handle about 6 times. This should remove
most of the liquid in the pump.
NOTE: To protect the unit from freezing temperatures, draw RV antifreeze (no alcohol) into the 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 15
15
High Pressure Washer
Generac 1800PSI 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.
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 16
16
High Pressure Washer
GENERAC
EXPLODED VIEW PRESSURE WASHER
Drawing No. B2810
Generac 1800PSI High Pressure Washer
16
Page 17
17
High Pressure Washer
REPAIR PARTS PRESSURE WASHER
Drawing No. B2810
GENERAC
Generac 1800PSI High Pressure Washer
ITEM PART NO. QTY. DESCRIPTION
1 BB2789 1 BASE, HSPW
2 B2537 1 ENGINE, Honda 4HP
3 B1262B 1 PUMP, GPW - EG
Horizontal
4 BB2534 1 HANDLE
5 22129 8 LOCKWASHER, M8
6 52858 2 NUT, M8 Locking Flange
7 39287 2 HHCS, M8 x 45
8 27007 2 MOUNT, Rubber Foot
9 B2142 2 WHEEL, 2" x 9" Black
Mag
10 75402 2 PUSHNUT, 1/2"
11 B2168 1 HANGER, Hose
12 B1460 4 CAP, Vinyl
13 B1779 2 COVER, Hinge
14 B2347 2 CAP, End
15 46476 2 CAPLUG
16 31669 1 BOLT, 1/4" - 20 x 1-3/4"
Carriage
17 B2071 2 NUT, 1/4" - 20 Locking
Flange
18 B2759 1 HOOK, Square Neck
1/4" - 20
19 B1631A 1 BILLBOARD
20 B2812 1 DECAL, 1800 PSI
21 B2796 1 DECAL, Instructions
22 88056 1 DECAL, Data
23 nsp 1 OVERLAMINATE
24 20566 1 DECAL, 1-800 #
25 A1040A 1 HOSE, Chemical
26 A1041 1 FILTER, Chemical Hose
ITEM
PART NO. QTY. DESCRIPTION
27 A1408 1 CAP, Garden Hose Inlet
28 21217 4 MOUNT, Vibration
29 45771 8 NUT, Hex M8 - 1.25
30 21424 1 CONNECTOR, Garden
Hose
31 B1880 3 NUT, M8 with Washer
32 50190 2 WASHER, M8 Flat
33 48031G 2 CLAMP, Hose 13/32"
34 B2218 2 O-RING, 1.625" I.D. x
.103"
35 B2486 1 ADAPTER, Engine
36 97100 1 CAP, High Pressure
37 B1969 1 HOSE, 1/4" x 25
38 30209 4 HHCS, 5/16" - 24 x 1
1/4"
39 B1861 1 GUN, High Pressure
40 42909 3 HHCS, M8 - 1.25 x 30
41 97739 1 PLATE, Pump Mounting
42 98300 1 SEAL, Engine Donut
43 B2517 1 DECAL, Recoil
44 97566 1 TAG, Nozzle
45 B3094 1 DECAL 4 HP
46 B1867E 1 WAND, Adjustable
Nozzle
47 B2163 1 KIT, Nozzle Cleaning
48 B2808 1 MANUAL, Owners
49 87815 1 GOGGLES, Saftey
50 30809 1 GROMMET, Drain Hose
51 B3107 1 HOSE, Thermal Relief
52 B3057 1 KIT, Maintenance
53 48031B 1 CLAMP, Hose 3/8"
Page 18
18
High Pressure Washer
GENERAC
Generac 1800PSI High Pressure Washer
Drawing No. B3096
EXPLODED VIEW PUMP
Page 19
19
High Pressure Washer
GENERAC
Generac 1800PSI High Pressure Washer
REPAIR PARTS PUMP
19
Drawing No. B3096
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 B2557 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 B3090 THERMAL RELIEF 1
44 20876 .5 OZ. SEALANT, THREAD LOCKTITE 545 O
45 B1077 O RING VENTURI 1
Page 20
Generac 1800PSI High Pressure Washer
GENERAC
LIMITED PRESSURE WASHER WARRANTIES
(includes Master Contractor)
GENERAC, LLC warrants to the original retail purchaser, the pressure washer manufactured by GENERAC,
LLC 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, llc GN-Series Engine-driven Engine: Warranted solely by Warranted solely by
Power Washer Engine Manufacturer Engine Manufacturer
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, LLC will, at its option, repair or replace any part which, upon examination by GENERAC, LLC or GENERAC, LLC 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 a pressure washer.
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, LLC 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 GENERAC, LLCs 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, LLC authorized warranty service facility or call 1-800-333-1322.
Warranty service can be performed only by a GENERAC, LLC 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 PORTABLE PRODUCTS, LLC
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