Irwindale TWC78-K6 User manual

Owner’s Manual
Instructions for Assembly, Testing, Operation, Servicing, and Storage.
Portable Gas Pressure Washer:
For Outdoor Use Only!
Irwindale Industrial Pressure Washer TWC78-K6 Owner’s
Manual

Welcome
Thank you for your purchase of this quality Irwindale Industrial product. We wish you years
of success using your new pressure washer. This machine is designed to clean dirty
surfaces with high pressure cold water.
This manual contains general warnings about the inherent risks of operating pressure
washers and specific warnings about the operation and maintenance of this particular
pressure washer. In addition, it outlines important maintenance and storage procedures.
Please read it carefully before operating, maintaining, repairing, and storing your new
pressure washer. Keep this owner’s manual handy so you can refer to it at any time. This
owner’s manual is considered a permanent part of the pressure washer and should remain
with the pressure washer if resold.
The information and specifications included in this publication were in effect at the time of
approval for printing. IES reserves the right, however, to discontinue or change
specifications or design at any time without notice and without incurring any obligation
whatsoever. No part of this publication may be reproduced without written permission.
Thank you for your business.
WARNING:
READ and UNDERSTAND the Owner’s Manual completely before using this
pressure washer.
Assemble, test and use only in accordance with the Owner’s Manual instructions.
WEAR personal protective gear when filling, using, cleaning, and servicing the
pressure washer.
DO NOT START the pressure washer until you have read, understood, and
followed the instructions in this manual. Improper use of the pressure washer
could result in serious injury or illness to the operator or nearby persons/animals,
and cause property damage.

2
Quick Facts About Your Pressure Washer
Inspect Upon Delivery: FIRST! Inspect for missing or damaged components. See “Initial
Set-Up” section of this manual for information on where to report missing or damaged parts.
Add Engine Oil: Engine is shipped without oil. See engine manual for instructions on
capacity and viscosity recommendations as well as instructions and safety precautions for
adding/changing engine oil.
Replace Temporary Shipping Pump Oil Plug: The pump is shipped with oil but with a
temporary shipping plug to prevent leakage during shipping. Check pump oil level before
starting, oil level should be half-way up the sight glass to the level pointed to by the
indicator. Remove the RED shipping oil cap and install the BLACK permanent crankcase
vent cap plug that is contained in the plastic bag containing this Owner’s Manual ( on select
units only).
Water Flow Requirements: Make sure your supply water flow rate is 20% higher than the
pressure washer’s flow rate (see “Operation” section for detail), and that your water is clean
and particle free.
Chemical Spraying: Use only approved pressure washer chemicals designed for high-
pressure use.
Storage: Do not allow water to freeze in the pump, hose, or spray gun(s). See “Storage”
section for more information.
Maintenance Schedule: Engine and pump require periodic inspection and servicing to
keep pressure washer functioning efficiently. See “Maintenance Schedule” section for
frequency of servicing.
Any Questions Contact Customer Service
Consult an Authorized Service Dealer regarding maintenance or repair procedures.
Please contact us with service-related questions regarding operating and assembling your
new pressure washer, including parts you may be missing.
Customer support: 1-888-980-4938
[email protected]
www.IrwindaleIND.com

3
Retain for your records
Record your pressure washer’s model number and serial number as well as the date you
purchased the pressure washer below.
Retain this information for your records. You’ll need to refer to this information when
ordering parts and contacting customer service about maintaining your pressure washer
and its warranty.
Model number:
_________________________________________
Serial number:
__________________________________________
Date purchased:
________Month _____________Day _____________Year
TWC34-K6 Nameplate

4
Contents
Welcome .................................................................................................................................................. 1
Quick Facts About Your Pressure Washer............................................................................................... 2
Any Questions Contact Customer Service.......................................................................................... 2
Important safety precautions.................................................................................................................... 6
Pressure washer Safety........................................................................................................................... 7
Safety Label Locations............................................................................................................................. 9
Safety and Operation Labels:................................................................................................................. 10
Detailed Safety warnings........................................................................................................................ 11
Carbon Monoxide WARNINGS.............................................................................................................. 11
Injection Injury WARNINGS ................................................................................................................... 12
Electrical Shock WARNINGS................................................................................................................. 12
About your pressure washer .................................................................................................................. 13
Reference manual contains critical information...................................................................................... 13
What’s in the Box? ................................................................................................................................. 13
Pressure washer Major Components and Controls Diagram................................................................. 14
Engine Major Components and Controls Diagram................................................................................. 15
Engine Controls...................................................................................................................................... 16
Initial Set-Up........................................................................................................................................... 17
Step 1, Inspect and Unpack................................................................................................................... 17
Step 2, Assembly ................................................................................................................................... 18
Step 3, Select Suitable Location ............................................................................................................ 20
Pre-operation check and Safety Rules................................................................................................... 22
Are you ready to get started?................................................................................................................. 22
Is your Pressure washer read to go? ..................................................................................................... 26
Fuel Requirements................................................................................................................................. 28
Always follow these general safety rules when fueling: ......................................................................... 29
Fill Engine Fuel Tank.............................................................................................................................. 30
Inspect Fuel System/Check for Leaks.................................................................................................... 30
Inspect Spray System ............................................................................................................................ 31
Perform Scheduled Maintenance, As Needed....................................................................................... 31
Connect Hoses, Water Supply, Spray Gun, and Spray Nozzle.............................................................. 31
Operation................................................................................................................................................ 36
Pressure washer Placement .................................................................................................................. 36
Start-Up Procedures............................................................................................................................... 36
Starting Engine. (See the engine owner’s manual for more details.) .................................................... 37

5
Applying Cleaning Chemical (If Desired)................................................................................................ 38
High Pressure Spraying ......................................................................................................................... 39
Shutdown Procedures............................................................................................................................ 40
Maintenance........................................................................................................................................... 40
Importance of maintenance.................................................................................................................... 40
Maintenance safety precautions............................................................................................................. 41
Pressure washer Maintenance Schedule............................................................................................... 42
Detailed Instructions – Maintenance & Repair....................................................................................... 43
Engine Maintenance............................................................................................................................... 45
Pump Maintenance ................................................................................................................................ 45
Inspect Fuel System............................................................................................................................... 45
Inspect & Clean Spark Arrestor (If equipped)......................................................................................... 46
Keep Pressure Washer Clean................................................................................................................ 46
Storing and transporting your pressure washer ..................................................................................... 47
Between-Use Storage............................................................................................................................ 47
Long Term Storage Preparation:............................................................................................................ 48
Preparing Pressure Washer for Freezing Conditions............................................................................. 48
Troubleshooting...................................................................................................................................... 49
Pressure washer assembly and parts list:.............................................................................................. 52
Pump assembly and parts list: ............................................................................................................... 53
Engine assembly and parts list:.............................................................................................................. 53
Contact information for Technical and Customer Assistance................................................................. 53
Locate an Authorized Service Dealer..................................................................................................... 53
Registration Card ................................................................................................................................... 54
Customer assistance.............................................................................................................................. 54
Limited Warranty.................................................................................................................................... 55

6
Important safety precautions
This manual contains critical safety information. Please read the entire manual closely.
Because safety is paramount and using a pressure washer carries significant
responsibilities, we have outlined warnings and the general hazards of operating pressure
washers. In addition, we have summarized the recommended procedures for operating,
repairing, maintaining, and storing your specific pressure washer to keep you and others
safe.
It would be impossible for us to warn you of each risk and all of the hazards involved in the
use of pressure washers. Therefore, it’s essential that you use your best judgment and
take precautions when using, maintaining, repairing, and storing your pressure washer.
There are many safety warnings in this manual and on the pressure washer itself to guide
you:
Pressure washer safety labels: The safety labels on your pressure washer warn of
potential danger. It’s critical that you read them. If any labels become difficult to read or
have been removed, contact your dealer for a replacement label.
Manual safety messages: This manual contains specific instructions and severe warnings
about the ramifications of using poor judgment and not following the instructions outlined in
this manual. The ramifications range from serious injury and losing consciousness to
death. These messages are preceded by a safety alert symbol and one of three signal
words, DANGER, WARNING, or CAUTION.
These signal words mean:

Manual headings and sections: We’ve devoted several sections of this manual to outline
the risks, hazards, and warnings when using, repairing, maintaining, and storing your
pressure washer.
Not following instructions or using poor judgment when using
and maintaining your pressure washer can cause you or
someone else to be KILLED or SERIOUSLY INJURED.
DANGER
WARNING
CAUTION
You WILL be KILLED or SERIOUSLY HURT if you don’t follow
instructions
You CAN be KILLED or SERIOUSLY HURT if you don’t follow
instructions
You CAN be HURT if you don’t follow instructions

7
Instructions: how to use this Pressure washer correctly and safely.
Pay attention to cautions such as, “Carbon monoxide WARNINGS” or “Burn and fire
WARNINGS.”
Pressure washer Safety
WARNING: SPECIAL HAZARDS
CO Poisoning: Exhaust from engine contains carbon monoxide, a poisonous gas that can
cause carbon monoxide poisoning and possible death if inhaled.
Injection Injury: High pressure water can pierce skin and underlying tissue, leading to
serious injury and possible amputation. Such an injection injury can result in blood
poisoning and/or severe tissue damage.
Flying Debris: High-pressure water can cause flying debris and possible surface damage.
Electric Shock: Operating equipment in wet conditions or near water can cause electric
shock.
Chemical Exposure: Cleaning chemical vapors or contact with skin may be hazardous.
Fire/Explosion: Engine sparking can ignite fuel or other flammable liquids or vapors in the
vicinity. Hot exhaust from engine can ignite combustible materials.
Burns: Pressure washer pump and engine are hot surfaces that can cause burn injuries.
* Detailed safety information about these hazards appears throughout this manual.
Important Safety Information
Irwindale Industrial pressure washers are designed to provide high pressure cold water
spray. Cleaning chemicals may be incorporated into the low pressure spray if desired. The
pressure pump for this equipment is powered by a gasoline internal combustions engine.
Special precautions are necessary when using this equipment in order to safely operate this
pressure washer. It is the user responsibility to read and understand this entire manual and
to operate this pressure washer in a safe manner.
Note: Do not use for other purposes, as unforeseen hazards or equipment damage may
result.
Most injuries or property damage can be prevented if you follow all instructions in this
manual and on the pressure washer. The most common hazards are discussed below,
along with the best way to protect yourself and others.

8
Operators Responsibility
It is the operator’s responsibility to provide the necessary safeguards to protect people and
property. Know how to stop the pressure washer quickly in case of emergency. If you leave
the pressure washer for any reason, always turn the engine off. Understand the use of all
controls and connections.
Adult Control ONLY: Only trained adults should set up and operate the pressure washer.
Be sure that anyone who operates the pressure washer receives proper instruction. Do not
let children operate the pressure washer. Keep children and pets away from the area of
operation.
Personal Protection: Wear safety apparel during operation, including safety glasses with
side and top protection. Ear protection is also recommended if working near any operating
engine.
Under the influence: Never operate, or let anyone else operate, the pressure washer while
fatigued or under the influence of alcohol, drugs, or medication.
* Keep this manual for reference and review.
Pressure washer Operation
This pressure washer is intended for outdoor use only.
This pressure washer is powered by a gasoline engine and therefore can only be operated
outdoors.
This pressure washer will require you to supply and install the following fluids and
equipment:
Pump oil (as specified)
Gasoline (as specified)
Engine Oil (as specified)
Personal Protection Equipment
* See “Specifications” section of this manual for more details.
Refuel With Care
Gasoline is extremely flammable, and gasoline vapor can explode. Refuel outdoors, in a
well-ventilated area, with the engine stopped and the pressure washer on a level surface.
Do not fill the fuel tank above the fuel strainer shoulder. Never smoke near gasoline, and
keep other flames and sparks away. Always store gasoline in an approved container.
Make sure that any spilled fuel has been wiped up before starting the engine.
Hot Exhaust
The muffler becomes very hot during operation and remains hot for a while after stopping
the engine. Be careful not to touch the muffler while it is hot. Let the engine cool down
before transporting the pressure washer or storing it indoors.

9
To prevent fire hazards, keep the pressure washer at least 7 feet (2 meter) away from
building walls and other equipment during operation. Do not place flammable objects close
to the engine.
Carbon Monoxide Hazard
Exhaust contains poisonous carbon monoxide, a colorless and odorless gas. Breathing
carbon monoxide can cause loss of consciousness and may lead to death.
If you run the pressure washer in an area that is confined, or even partly enclosed, the air
you breathe could contain a dangerous amount of exhaust gas.
Never run the engine inside a closed garage, house, or confined area.
Safety Label Locations
NOTICE:
ATTENTION: Rental Companies and Private Owners who loan this
equipment to others!
 All persons to whom you rent/loan this pressure washer must have access to and read
this manual. Keep this owner’s manual with the pressure washer at all times and
advise all persons who will operate the machine to read and understand it. You must
also provide personal instruction on how to safely set-up and operate the pressure
washer and remain available to answer any questions a renter/borrower might have.
Owner’s manuals are available from Irwindale Industrial Customer Support at 1-888-
980-4938 or [email protected]
On Product Warning Labels
Part Number Description
201386 Fuel Explosion Hazard
20137 Burn Hazard
201388 Operational Warnings
201385 Explosion/CO2 Warning
201387 Operation Instructions
E15 E15 Warning

10
Safety and Operation Labels:
To order replacement safety labels, call Irwindale Industrial Customer Support at
1-888-980-4938.

11
Detailed Safety warnings
Carbon Monoxide WARNINGS
Only operate your pressure washer outdoors.
Operating a pressure washer carries serious responsibility. There
are precautions that you need to take when operating a pressure
washer:
Never operate your pressure washer indoors or near any
windows or doors.
Never operate your pressure washer in an enclosed or a
partially enclosed area such as a garage.
Do not let the exhaust from your pressure washer build up to
dangerous levels.
Do not breathe the poisonous gas in your pressure washer’s
exhaust.
Become familiar with your pressure washer. Understand all of
your pressure washer’s controls, connections, and outputs.
Know how to quickly stop your pressure washer in case of an
emergency.
If anyone else operates your pressure washer, be sure he/she
is properly instructed.
Do not let children play with or operate your pressure washer.
Keep your pressure washer at least three feet away from flammable materials.
WARNING: Engine Exhaust Chemicals
The engine exhaust from this product contains chemicals known to the State of
California to cause cancer, birth defects or other reproductive harm.
Burn and Fire/Explosion WARNINGS
The exhaust from your pressure washer contains carbon monoxide. Breathing this
poisonous gas, which is odorless and colorless, can cause unconsciousness and
could even kill you.
Your pressure washer’s exhaust system becomes hot
enough that it could ignite some materials and cause severe
burns. Gasoline is highly flammable and can be explosive,
so use extreme caution when refueling and operating your

12
Operating a pressure washer carries serious responsibility. There are precautions that you
need to take when operating a pressure washer to avoid fire, burns, or explosions:
Stop engine when refueling.
Do not smoke when refueling your pressure washer.
Keep your pressure washer at least seven feet (or 2 meters)
away from buildings and equipment.
Keep flammable materials away from your pressure washer.
Do not allow sparks or flames near your pressure washer when
it’s refueled and keep them away from your stored gasoline.
Fuel vapors are highly flammable, so they could ignite after your
pressure washer is started. Wipe up any spilled fuel before you
restart your pressure washer.
Do not operate your pressure washer in enclosed or partially
enclosed areas.
Avoid touching your pressure washer’s muffler. It becomes
extremely hot when your pressure washer is in use. It remains hot for quite a while after
you turn your pressure washer off, so wait to move your pressure washer into storage
until the muffler has completely cooled to avoid severe burns.
Injection Injury WARNINGS
This pressure washer produces a high pressure water spray that
can pierce skin and underlying tissues, leading to serious injury and
possible amputation. Such an injection injury can result in blood
poisoning and/or severe tissue damage. Never direct the spray at
people or animals. Seek IMMEDIATE medical /surgical treatment
for suspected injection injury. If injured by high-pressure fluid, no
matter how small the wound is, see a doctor at once. A typical
injection injury may be a small puncture wound that does not look
serious. However, severe infection or reaction can result if proper
medical treatment is not administered immediately by a doctor who
is familiar with injection injuries.
Electrical Shock WARNINGS
Water can conduct electricity, when operating the pressure washer keep water away from
electrical outlets and electric devices.

13
About your pressure washer
Reference manual contains critical information
It’s recommended that you keep this Owner’s Manual near your pressure washer, so you
can refer to it while operating and maintaining it. If you resell your pressure washer, this
manual is considered to be a part of the pressure washer and should be passed along with
it to the new owner.
The information contained in this manual as well as the specifications outlined in it were in
effect upon approval for publishing this manual. Irwindale Industrial reserves the right to
change the specifications and instructions. Irwindale Industrial also reserves the right to
discontinue and modify the design of the pressure washer at any point without incurring any
obligation and without providing notice. This document may not be reproduced in whole or
in part without written permission from Irwindale Industrial.
Attention: All Rental Companies and Private Owners who loan this equipment
to others!
All persons to whom you rent/loan this pressure washer must have access to and read this
manual. Keep this owner’s manual with the pressure washer at all times and advise all
persons who will operate the machine to read it. You must also provide personal instruction
on how to safely operate the pressure washer and be available to answer any questions a
renter/borrower might have.
This pressure washer is a machine designed for outdoor pressure washer applications
primarily used in cleaning surfaces. The technical specifications for your pressure washer
are provided in the “Specifications” section of this manual.
What’s in the Box?
Below is a summary of the components included in your pressure washer package. It’s
recommended that you review the items listed below and confirm they were all included in
your purchase.
Name of Component Quantity
Pressure Washer 1
Owner’s Manual
Engine Manual
Pump Manual
1
1
1

14
Pressure washer Major Components and Controls Diagram
Below are diagrams of your pressure washer’s major components and controls:
1. Handle: Foldable handle that
locks into place for ease of
mobility and storage.
2. Trigger: Controls the release
of high pressure water.
3. Upper Wand Holder: To
store wand on the frame for
transport and storage.
4. Upper Support: Provides
hose storage and displays
safety/operation warnings.
5. High Pressure Hose: High
pressure hose for connect
pressure washer to the wand.
6. Gun Assembly: Houses the
trigger and connects to the
wand to form the entire
gun/wand assembly.
7. Engine: Shipped WITHOUT
engine oil. Refer to engine
owner’s manual for proper
engine oil and capacity.
8. Lower Wand/Lance
Holder: Secures the lower
wand and lance to the frame for
transport and storage.
9. Nozzle holder: Securely
holds the nozzles not currently
in use and provides easy
access for changing nozzles.
10. High Pressure Pump:
pressurizes water
11. High Pressure Hose
Connection: Connection for
high pressure hose.
12. Frame: Solid tubular frame.
13. Run-Flat Tires: Provide
ease of mobility, no
maintenance.
14. Support Legs: Provide
stable support for pressure
washer.

15
Engine Major Components and Controls Diagram

16
Engine Controls
Fuel Shut Off
The fuel shut off valve opens and closes the connection between the fuel tank and the
carburetor. The fuel shut off valve lever must be in the ON position for the engine to run.
When the engine is not in use, leave the fuel valve lever in the OFF position to prevent
flooding and to reduce the possibility of fuel leaks.
On/Off Switch
The ignition On/Off switch controls the ignition system. The ignition switch must be in the
ON position for the engine to run. Turning the ignition switch to the OFF position stops the
engine.
Choke Control
The choke control lever opens and closes the choke valve in the carburetor. The CLOSED
position enriches the fuel mixture for starting a cold engine. The OPEN position provides
the correct fuel mixture for operation after starting, and for restarting a warm engine.
Throttle Control
The throttle control lever controls engine speed. Moving the lever toward the fast position
makes the engine run faster and moving the lever towards the slow position makes the
engine run slower. Pressure washer output is controlled by adjusting the throttle lever. At
fastest throttle position, the Pressure washer will deliver the highest output volume. Moving
the throttle control lever to toward the slow position will decrease the output volume of the
Pressure washer.
Starting Handle
Pulling the starting handle operates the recoil starter to crank the engine for starting.
Oil Sentry (if equipped)
This switch is designed to prevent engine from starting in low oil or no oil condition. Oil
Sentry may not shut down a running engine before damage occurs. In some applications
this switch may activate a warning signal.

17
Initial Set-Up
Step 1, Inspect and Unpack
Upon receipt, inspect pressure washer for missing or damaged parts. Verify that is the
Pressure Washer you ordered.
See “Component Identification” section of this manual for a diagram of the Pressure
Washer and its components.
For missing components, contact Irwindale Support at 1-888-980-4938.
For damage components, contact the freight company that delivered the unit and file a
claim.
If complete, fill out the product serial number information. See Limited Warranty section of
this manual.
IMPORTANT NOTE: This pressure washer is heavy and 2 (two) people will be required to
unpack and assemble the unit.
Tools required: Rubber Mallet, #3 or #2 Phillips head screwdriver, wrenches (2- 10 mm or
2-3/8 inch, 1 – 22mm or 7/8 inch, 1-19mm or ¾ inch, 1-18mm or 11/16).
UNPACK:
a) Carefully cut the straps and tape on the top of the box and open.
b) Remove the luan top cover and place on the floor.
c) Remove the cardboard cover and place it on the floor on top of the luan, this will be
used as an assembly base for the next steps.
d) Remove the components that are individually packed and set aside.
e) With the help of another person (two people are required for this step), carefully
remove the pressure washer main unit from the box and set it upon the cardboard
cover as shown below.
Step a, cut the straps
and tape on top of box Step b, remove luan cover and place on floor Step c, remove cardboard cover and place on luan for
work surface
Step d, carefully remove the individually
wrapped components and set aside Step d, with the aid of a second person, remove
the main unit and set it on the work surface.

18
Individual components:
Step 2, Assembly
1. Attach Rubber Feet and Brackets.
a. Using the bolts supplied attach the brackets with the rubber feet on to the frame as
shown in the pictures below. Insert the bolts from the outside of the unit towards the
inside and secure the bolts with the cap nuts provided using 10mm wrenches. Do
not over-tighten. A second person should steady the frame for this step.
2. Assemble Wheels and Axle Hardware.
a. Place large diameter washer on to the axle shaft and insert the axle into the
wheel/tire assembly as shown in figure a., you may have to use a rubber mallet to
tap the axle through the wheel opening.
b. Slide the axle wheel assembly onto the frame assembly and place a washer onto
the axle and secure with a cotter key as shown in figure b. A second person should
steady the frame for this step.
Figure 1,
Axle Hardware Figure 3, Upper Support Figure 4, Rubber Feet
and Brackets
Figure 2, Wheels
Figure 5, handle
lock hardware Figure 7, hose, gun, lance, and nozzles Figure 8, Kohler engine manual Figure 9, AR pump
manual
Figure a.,
axle/washer/wheel/tire
assembly
Figure b, insert washer and
secure with cotter pin,
bend pins so they do not
extend past the washer

19
3. Install the Handle Locking Hardware.
a. Separate the nut from the spring lock as shown in Figure a.
b. Insert the spring lock as shown in Figure b.
c. Secure the lock to the frame with the nut as shown in Figure c. You will need to use
a ¾ inch wrench (or 19mm) to hold the spring lock and secure the nut with a 7/8 in
wrench (or 22mm). Do not over-tighten.
4. Attach Upper Support.
a. Using the 4 bolts provided, insert the bolts through the front of the frame handle
support as shown in figure f. Next hold the Upper support against the back of the
frame handle support and secure the bolts using a #3 or #2 Phillips head
screwdriver into the Upper Support as shown in figure g. Be careful to make sure
the bolt does not cross-thread into the upper support. Do not over-tighten.
b.
5. Attach the wand to the gun.
a. Insert the wand with the nozzles attached into the gun, figure a.
b. Tighten the black nut on the gun until the wand is secured as shown in figure b.
6. Fill the engine with the required engine oil as specified in the Kohler manual included with
your pressure washer. Please follow the instructions closely from the Kohler manual and
also familiarize yourself with the engine operation as described.
Figure a, separate the
nut from the spring lock Figure b; insert the spring lock into the
frame
Figure c, secure the nut
on to the spring lock
Figure f. Figure g.
Figure a, insert the wand
into the gun nut and
tighten the nut.
Figure b, tight the nut
until the wand is secured
fully as shown.
Figure h.