Mi-T-M HMT-4004-0MGH User manual

HMT-4004-0MGH Operator's Manual 1©Copyright 2019 Form #37-1467-E/S-011422
CAUTION
RISK OF INJURY!
READ MANUAL BEFORE OPERATING!
This manual is an important part of the hot water trailer and must
remain with the unit when you sell or rent it!
HMT-4004-0MGH
HMT-4004-0MGV
HOT WATER TRAILER
OPERATOR'S MANUAL

2 HMT-4004-0MGH Operator's Manual
WARNING: This product can expose you to
chemicals including Lead, which is known to
the State of California to cause cancer and birth
defects or other reproductive harm. For more
information go to www.P65Warnings.ca.gov
WARNING
WARNING: This product can expose you to
chemicals including carbon monoxide, which is
known to the State of California to cause birth
defects or other reproductive harm. For more
information go to www.P65Warnings.ca.gov
WARNING
INTRODUCTION...........................................................................................................................................3
IMPORTANT ............................................................................................................................................3
IMPORTANT SAFETY INSTRUCTIONS........................................................................................................4
HMT-4004-0MGH FEATURES....................................................................................................................10
INSTALLATION & PREPARATION...............................................................................................................11
WARNING ........ ........................................................................................................................................18
OPERATING INSTRUCTIONS ..................................................................................................................19
STORAGE & MAINTENANCE.....................................................................................................................23
TROUBLESHOOTING ................................................................................................................................26
MAINTENANCE CHART TRAILER..............................................................................................................28
MAINTENANCE CHART PRESSURE WASHER.........................................................................................29

HMT-4004-0MGH Operator's Manual 3
INTRODUCTION
Congratulations on the purchase of your new hot water trailer! You can be assured your hot water trailer was con-
structed and designed with quality and performance in mind. Each component has been rigorously tested to ensure
the highest level of acceptance.
This operator's manual was compiled for your benet. By reading and following the simple safety, installation,
operation, maintenance and troubleshooting steps described in this manual, you will receive years of trouble free
operation from your new hot water trailer. The contents of this manual are based on the latest product information
available at the time of publication. The manufacturer reserves the right to make changes in price, color, materials,
equipment, specications or models at any time without notice.
! IMPORTANT !
These paragraphs are surrounded by a "SAFETY ALERT BOX". This box is used to designate and emphasize
Safety Warnings that must be followed when operating this pressure washer.
Accompanying the Safety Warnings are "signal words" which designate the degree or level of hazard
seriousness. The "signal words" used in this manual are as follows:
DANGER:Indicates an imminently hazardous situation which, if not avoided, WILL
result in death or serious injury.
WARNING: Indicates a potentially hazardous situation which, if not avoided, COULD
result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation which, if not avoided, MAY
result in minor or moderate injury.
The symbols set to the left of this paragraph are "Safety Alert Symbols." These symbols are used to call attention
to items or procedures that could be dangerous to you or other persons using this equipment.
ALWAYS PROVIDE A COPY OF THIS MANUAL TO ANYONE USING THIS EQUIPMENT. READ ALL INSTRUCTIONS BEFORE
OPERATING THIS PRESSURE WASHER AND ESPECIALLY POINT OUT THE "SAFETY WARNINGS" TO PREVENT THE
POSSIBILITY OF PERSONAL INJURY TO THE OPERATOR. ONLY TRAINED OPERATORS SHOULD USE THIS PRODUCT!
Once the unit has been removed from the box, immediately write in the serial number of your unit in the space pro-
vided below.
SERIAL NUMBER_________________________________
Inspect for signs of obvious or concealed freight damage. If damage does exist, le a claim with the transportation
company immediately. Be sure that all damaged parts are replaced and the mechanical and electrical problems are
corrected prior to operation of the unit. If you require service, contact your Customer Service Representative.
Please have the following information available for all service calls:
1. Model Number
2. Serial Number
3. Date and Place of Purchase

4 HMT-4004-0MGH Operator's Manual
POTENTIAL CONSEQUENCE PREVENTION
IMPORTANT SAFETY INSTRUCTIONS
READ ALL SAFETY WARNINGS BEFORE USING PRESSURE WASHER
RISK OF
EXPLOSION OR FIRE Serious injury or death may occur
from normal sparks in the multiple
ignition sources or engine/burner
exhaust.
Always operate pressure washer in a well
ventilated area free of ammable vapors,
combustible dust, gases or other combus-
tible materials.
Do not store the pressure washer near an
open ame or any equipment such as a
stove, furnace, water heater, etc., which
utilizes a pilot light or sparking device.
Do not use this pressure washer to spray
ammable material!
Do not smoke while lling fuel tanks.
Never ll the fuel tanks while the engine is
running or hot. Allow the engine to cool two
minutes before refueling.
Do not refuel indoors or in a poorly venti-
lated area.
Always refuel slowly to avoid the possibility
of spilled fuel which may cause a risk of re.
Engine Fuel Tank:
If using a Gasoline Engine, refuel with gaso-
line only. Do not use diesel or fuel oil.
Burner Fuel Tank:
When refueling the Burner Fuel Tank, use
No. 1 or No. 2 fuel oil/diesel or kerosene.
Do not use gasoline, crankcase drainings, or
oil containing gasoline or solvents.
Do not operate the unit if gasoline or diesel
fuel is spilled. Wipe the pressure washer
clean and move it away from the spill.
Avoid creating any ignition until the gasoline
or diesel fuel has evaporated.
When the battery is being activated, hydro-
gen and oxygen gases in the battery are
extremely explosive. Keep open sparks and
ames away from the battery at all times,
especially when charging the battery.
Be certain to disconnect the battery ground
terminal before servicing. When discon-
necting the cable from the battery, start
with the negative terminal, and when con-
necting them, start with the positive cable.
When charging the battery, remove the bat-
tery vent plugs.
Use only a voltmeter or hydrometer to check
a battery charge.
DO NOT jump start the battery unless both
batteries are of equal voltage and amper-
age.
HAZARD
Serious injury or death may occur
from the battery.
Serious injury or death may occur
as a result of improper fueling.

HMT-4004-0MGH Operator's Manual 5
HAZARD POTENTIAL CONSEQUENCE PREVENTION
IMPORTANT SAFETY INSTRUCTIONS
READ ALL SAFETY WARNINGS BEFORE USING PRESSURE WASHER
Serious injury or death may occur
from inhaling engine/burner ex-
haust or dangerous vapors. The
engine exhaust from this product
contains chemicals known to the
State of California to cause can-
cer, birth defects, or other repro-
ductive harm.
A spark arrester must be added to the
mufer of this engine when using on land
covered with any ammable agricultural
crop (hay and grain), and if they are used
in or near brush or forested areas. The
arrester must be maintained in effective
working order by the operator. In the state
of California, the above is required by law.
(Section 4442 and 4443 of the California
Public Resources Code.) Other states
may have similar laws. Federal laws apply
on Federal lands.
This pressure washer has a Safety Re-
lief Valve which should never be altered,
modied, removed or made inoperative. If
the device fails, replace immediately with
genuine manufacturer replacement part.
Never operate this pressure washer in an
enclosed area. Always make certain there
is adequate ventilation (fresh outside air)
for breathing and combustion. This will
prevent the buildup of dangerous carbon
monoxide gases. Beware of poorly ven-
tilated areas, or areas with exhaust fans
which can cause poor air exchange.
Follow all safety instructions provided with
the materials you are spraying. Use of a
respirator may be required when work-
ing with some materials. Do not use this
pressure washer to dispense hazardous
detergents.
RISK OF
ASPHYXIATION
Serious injury or death may occur
from a ground re caused by a muf-
er spark.
RISK OF FIRE
Serious injury or death may occur
if system safety's are not properly
maintained.

6 HMT-4004-0MGH Operator's Manual
HAZARD POTENTIAL CONSEQUENCE PREVENTION
IMPORTANT SAFETY INSTRUCTIONS
READ ALL SAFETY WARNINGS BEFORE USING PRESSURE WASHER
Keep clear of nozzle and spray! Never
put your hand, ngers or body directly
over the spray nozzle.
Never point the high pressure discharge
spray at yourself or anyone else. This
equipment is to be used only by trained
operators.
Always keep operating area clear of all
persons.
Do not allow children to operate this unit.
Seek emergency medical care if the spray
appears to have penetrated the skin! Do
not treat as a simple cut!!
High pressure hoses and fuel lines should
be inspected daily for signs of wear. If ev-
idence of failure exists, promptly replace
all suspect hoses and fuel lines to prevent
the possibility of injury from the high pres-
sure spray. If a hose or tting is leaking,
Never place your hand directly on the leak
Never operate the gun with the trigger
wired in the open position. To prevent ac-
cidental discharge, the trigger gun should
be securely locked when not in use.
Before removing the spray nozzle or
servicing the unit, always shut off the unit
and trigger the gun to release trapped
pressure. (Even after you shut off the
unit, there is high pressure water left in
the pump, hose and gun until you release
it by triggering the gun.)
Serious injury or death could
occur from high pressure spray
penetrating the skin.
RISK OF INJECTION
OR
SEVERE CUTTING INJURY
RISK OF
ELECTROCUTION
OR ELECTRICAL SHOCK
Serious injury or death may occur
from contact with electricity. Do not direct spray on or into electrical installations of any kind! This includes
electrical outlets, light bulbs, fuse boxes,
transformers, the unit itself, etc.
Do not allow metal components of the
pressure washer to come in contact with
live electrical components.

HMT-4004-0MGH Operator's Manual 7
RISK OF BURNS Serious injury may occur from
touching the engine, mufer or
heat exchanger. These areas can
remain hot for some time after
the pressure washer is shutdown.
Serious injury may occur from a
pressure washer malfunction or
exploding accessories if incorrect
system components, attachments
or accessories are used.
Never make adjustments to the factory set
pressures.
Never exceed manufacturers maximum al-
lowable pressure rating of attachments.
Do not allow any hoses to make contact
with the engine, mufer, or heat exchanger
to prevent the possibility of bursting. Avoid
dragging the hoses over abrasive surfaces
such as cement.
Use only manufacturer recommended repair
parts for your pressure washer.
In freezing temperatures, the unit must al-
ways be warm enough to ensure there is no
ice formation in the pump. Do not start the
pressure washer if it has been transported in
an open or non heated vehicle without rst
allowing the entire unit to thaw.
RISK OF BURSTING
Before making any adjustments, be cer-
tain the engine is turned off. Be certain
to disconnect the battery ground terminal
before servicing and the ignition cable(s)
is removed from the spark plug(s). Turning
the machinery over by hand during adjust-
ment or cleaning might start the engine and
machinery with it.
Do not operate the unit without all protective
covers in place.
Never allow any part of your body to contact
the engine, mufer or heat exchanger.
Serious injury may occur to the
operator from moving parts on the
pressure washer.
RISK FROM MOVING PARTS
HAZARD POTENTIAL CONSEQUENCE PREVENTION
IMPORTANT SAFETY INSTRUCTIONS
READ ALL SAFETY WARNINGS BEFORE USING PRESSURE WASHER
Serious injury or death may occur
if attempting to start the pressure
washer when the pump is frozen.

8 HMT-4004-0MGH Operator's Manual
RISK OF BODILY INJURY
IMPORTANT SAFETY INSTRUCTIONS
READ ALL SAFETY WARNINGS BEFORE USING PRESSURE WASHER
Serious injury or death may occur
from detergents contacting the
skin.
Serious injury can occur from
loose debris being propelled at a
high speed from the spray gun.
Injury may occur if the operator
loses his balance caused by the
thrust of water traveling through
the spray nozzle.
Seek emergency medical care if you are
using cleaning agents and the spray ap-
pears to have penetrated the skin! Do not
treat as a simple cut. Be prepared to tell a
physician exactly what kind of detergents
you were using by reading the Material
Safety Data Sheet (MSDS) provided with
your detergent.
Never use any solvents or highly corrosive
detergents or acid type cleaners with this
pressure washer.
Protective equipment such as rubber suits,
gloves and respirators are advisable, espe-
cially when using cleaning detergents.
Keep all detergents out of the reach of
children!
Always wear protective goggles when oper-
ating the unit to shield the eyes from ying
debris and detergents.
Do not direct spray toward fragile materials
such as glass for shattering could occur.
Stay alert-watch what you are doing. Do
not operate the unit when fatigued or under
the inuence of alcohol or drugs.
Never squeeze the trigger unless securely
braced.
Do not overreach or stand on unstable
support.
Wet surfaces can be slippery, wear protec-
tive foot gear and keep good footing and
balance at all times.
Never trigger the gun while on a ladder or
roof.
HAZARD POTENTIAL CONSEQUENCE PREVENTION

HMT-4004-0MGH Operator's Manual 9
RISK OF BODILY INJURY
IMPORTANT SAFETY INSTRUCTIONS
READ ALL SAFETY WARNINGS BEFORE USING PRESSURE WASHER
Always hold on rmly to the gun/lance
assembly when starting and operating the
unit. Failure to do so can cause the lance
to fall and whip dangerously.
Know how to stop the pressure washer and
bleed pressures quickly. Be thoroughly
familiar with controls.
Follow the maintence instructions specied
in the manual.
Do not leave pressurized unit unattended.
Shut off the pressure washer and release
trapped pressure before leaving.
Do not operate the unit if you see any fuel,
oil or water leaks from the machine. Do not
resume operation until the unit has been in-
spected and repaired by a qualied service
person.
Never run the unit with the governor dis-
connected or operate at excessive speeds.
Place unit in a clean, dry, at area for
servicing. Before servicing the unit: turn
the unit off, relieve the water pressure from
the trigger gun, and allow the unit to cool
down. Service in clean, dry, at area. If ap-
plicable, block wheels to prevent unit from
moving.
Do not move the unit by pulling on the
hose.
HAZARD POTENTIAL CONSEQUENCE PREVENTION
!SAVE THESE INSTRUCTIONS!
Injury may occur from the pressure
washer.

10 HMT-4004-0MGH Operator's Manual
HMT-4004-0MGH FEATURES
1 Quick Connect Nozzle Holder
2 Fuel Tank
3 Engine
4 Gas Tank
5 Choke
6 Control Panel
7 Rocker Switch - Burner
8 Water Inlet
9 Water Outlet
10 High Pressure Pump
11 Gun/Wand Holder
12 Frame Assembly
13 Pressure Switch
14 High Pressure Hose
15 Trigger Safety Lock
16 Trigger Gun
17 Insulated Lance
18 Adjustable Pressure Dual Lance
19 High Pressure Nozzle
20 Safety Flag
21 Caster Assembly
22 Swing-Away Coupler
23 Unloader
24 Key Switch
25 Heat Exchanger Outlet
26 Burner
27 Fuel Filter/Water Seperator
28 Battery Box
29 Engine Oil Drain
HMT FEATURES 030920
20
16
15
17
18
19
21
22
14
12 11
13
1
6
8
9
10
2
3
7
4
5
25
23
27
26
28
29
24

HMT-4004-0MGH Operator's Manual 11
INSTALLATION & PREPARATION
SAFETY:
WARNING: DO NOT OPERATE TRAILER UNTIL THIS MANUAL HAS BEEN READ AND UNDERSTOOD.
1. Thoroughly read and understand all instructions before operating this trailer.
REPORTING SAFETY DEFECTS:
If you believe that your vehicle has a defect which could cause a crash or could cause injury or death, you should
immediately inform the National Highway Trafc Safety Administration (NHTSA) in addition to notifying the trailer
manufacturer.
If NHTSA receives similar complaints, it may open an investigation, and if it nds that a safety defect exists in a
group of vehicles, it may order a recall and remedy campaign. However, NHTSA cannot become involved in individu-
al problems between you, and your local dealer.
To contact NHTSA, you may either call the Auto Safety Hotline toll free at 1-800-424-9393 (or 366-0123 in Washing-
ton, DC area) or write to NHTSA, U.S. Department of Transportation, Washington, DC 20590. You can also obtain
information about motor vehicle safety from the Hotline.
BEFORE TOWING TRAILER:
WARNING: BEFORE USING A TOW VEHICLE WITH A TRAILER, VERIFY THAT THE VEHICLE IS DESIGNED
FOR THE LOAD. USING A VEHICLE THAT IS TOO SMALL IS VERY DANGEROUS. BE CERTAIN THAT IT
CAN HANDLE THE M.G.T.W. (MAXIMUM GROSS TRAILER WEIGHT) AND THE TONGUE WEIGHT FOR
SAFE TOWING AND BRAKING.
SELECTING THE PROPER TOWING EQUIPMENT
WEIGHT
When selecting the proper towing equipment, the two most important factors that must be considered are the
M.G.T.W. (Maximum Gross Trailer Weight) and the Tongue Weight. The M.G.T.W. is the total weight of the trailer plus
the payload in the trailer. The tongue weight is the downward pressure exerted at the coupler. The easiest way to
measure the gross trailer weight is to place the loaded trailer on a vehicle scale making sure that the scales are sup-
porting the entire weight of the loaded trailer.
The easiest method to measure tongue weight (up to 300 lbs.) is to place the jack stand (trailer tongue) on a bath-
room scale making sure the trailer is level. For heavier tongue weights, place a board across the bathroom scale and
a solid object of the same thickness as the scales with a piece of pipe between each. The trailer tongue should be
level and in its normal towing position. Multiply the scale reading by three (3) to obtain the tongue weight. Make sure
the tow vehicle is able to tow the load.
• Be sure hitch capacity is equal to or greater than the load when mounted on the vehicle.
• Be sure the size and rating of the hitch ball is equal to or greater than the load.
• Make sure the safety chain(s) rating is equal to or greater than twice the maximum gross trailer weight
rating of your trailer.
• It is against the law to carry passengers in the back of any trailer.
• Any alterations or changes made to the trailer void any express or implied warranties on the trailer or
towing equipment.
• Check lug nuts for tightness before initial trip, at 25 miles, every 100 miles of operation thereafter.
TOW VEHICLE
Make sure the vehicle you are using to tow the trailer is capable of towing the weight. Check the vehicle Owner's
Manual for towing capability of the towing vehicle or contact the car dealer for this information. Make sure the tow
vehicle is able to tow the load. Vehicle brake capacity is extremely critical and the tow vehicle must be able to handle
the additional weight of the trailer. Radiator and transmission cooling must also be considered.
TOW HITCH CAPACITY
Hitch Class Maximum Tow Capacity Maximum Tongue Weight
Sub Class I 1000 Lbs. 100 Lbs.
Class I 2000 Lbs. 200 Lbs.
Class II 3500 Lbs. 300 Lbs.
Class III and 4 5000 Lbs. Plus 500 Lbs. Plus

12 HMT-4004-0MGH Operator's Manual
SAFETY CHAINS
Listed in the chart below are the different class's of safety chains and the rated load each chain must be capable of
withstanding.
WARNING: FAILURE TO PROPERLY ATTACH SAFETY CHAINS BETWEEN THE TRAILER AND TOW
VEHICLE CAN RESULT IN A RUNAWAY TRAILER.
WARNING: TO AVOID ACCIDENTS, BEFORE TRAILERING:
• Hitch only to ball size marked on coupling.
• Ball clamp must capture ball and lever or hand wheel is fully clamped
• Cross safety chains under coupling.
• Allow only enough slack for turns.
ELECTRICAL TRAILER WIRING
All trailers must have taillights, brake lights and turn signals connected to the towing vehicle's electrical system. It
is also recommended that a heavy duty turn signal asher and emergency asher (if separate) be installed since the
trailer lights place an extra load on car asher units.
TOWING HEAVY TRAILER LOADS
Additional equipment. The following items may be helpful for towing heavy loads. Consult your vehicle's owner
manual or dealership for recommended towing accessories.
• Overload Springs
• Overload or air shocks
• Transmission Oil Cooler
• Engine Oil Cooler
• Coolant Recovery System
• Heavy Duty Fan
• Side View Mirrors
• Sway Control
TIRE PRESSURE
Proper air pressure for your tires is printed on the sidewall. Check pressure while tires are cold. Do not raise or lower
pressure to meet load. Pressure other than recommended pressure will lead to excessive tire wear or tire failure.
Balancing recommended. Preferred balancing method is to center off of stud holes, since 13" through 16.5 wheels
are not hub piloted.
WARNING: FOR A NEW TRAILER, THE WHEEL LUG NUTS SHOULD BE TIGHTENED TO THE PROPER
TORQUE SPECIFICATION BEFORE USE, AFTER 25 MILES OF OPERATION AND EVERY 100 MILES
OF OPERATION THEREAFTER. FAILURE TO CHECK THE LUG NUTS FOR PROPER TIGHTNESS CAN
RESULT IN AN ACCIDENT DUE TO A WHEEL FALLING FROM THE TRAILER.
WARNING: NEVER OPERATE A TRAILER OR TOW VEHICLE THAT HAS A LOOSE, MISSING OR BROKEN
LUG NUT. THE TRAILER IS DESIGNED FOR SAFE OPERATION WITH ALL LUG NUTS INSTALLED AND
ALL AT THE PROPER TORQUE RATING. OPERATING THE TRAILER WITH ONE OR MORE BROKEN
OR MISSING LUG NUTS GREATLY INCREASES THE LOAD ON THE REMAINING NUTS AND CAN
CAUSE FAILURE OF THE REMAINING NUTS THAT CAN RESULT IN AN ACCIDENT DUE TO A WHEEL
FALLING FROM THE TRAILER.
INSTALLATION & PREPARATION
Trailer Class Trailer weigth GVWR in lbs. Minimum braking strength in lbs.
Class I to 2000 lbs. 2000 lbs.
Class II 2000 to 3500 lbs. 3500 lbs.
Class III 3500 to 5000 lbs. 5000 lbs.

HMT-4004-0MGH Operator's Manual 13
WHEEL LUGS
Wheel lug nuts must be tightened with a torque wrench. Refer to the chart below for proper torque.
1. Start all bolts or nuts by hand to prevent cross threading.
2. Tighten bolts or nuts following sequence at right.
3. Tightening of the fasteners should be done in stages. Following the recommened sequence, tighten fasteners per
wheel torque chart below.
4. Wheel nuts/bolts shuld be torqued before rst road use and after each wheel removal. Check and re-torque after
rst 10 miles, 25 miles and again at 50 miles.. Check periodically thereafter.
CASTER OPERATION
This trailer is equipped with a tongue mounted caster for use when not coupled to the tow vehicle.
WARNING: THE CASTER MUST BE IN THE UP POSITION WHEN
ATTACHED TO THE TOW VEHICLE FOR SAFE AND PROPER
TOWING.
To place the caster in the up position remove the locking safety pin and
remove caster from trailer. Rotate caster bracket 90 degrees and install on
trailer. Install the safety pin and ensure lock wire is secure.
BRAKE OPERATION
This trailer is equipped with a caster mounted brake mechanism for use when
not coupled to the tow vehicle.
WARNING: TO AVOID INJURY, THE TRAILER BRAKE MUST BE APPLIED WHEN OPERATING THE UNIT
AND WHEN NOT IN USE.
To engage the caster brake simply push down on the brake lever using your foot. To release the caster brake pull up
on the brake lever until it is in the horizontal position.
ATTENTION: PLACING BRAKE LEVER ABOVE HORIZONTAL POSITION WILL NOT ALLOW THE CASTER
TO SWIVEL AND CAN CAUSE PAINT DAMAGE.
SWING-AWAY TONGUE OPERATION
This trailer is equipped with a swing-away tongue coupler kit for compact storage.
WARNING: HINGE PIN MUST BE INSTALLED AND SECURED IN
SWING-AWAY WHEN ATTACHED TO THE TOW VEHICLE FOR
SAFE AND PROPER TOWING.
To operate swing-away coupler remove cotter pin from hinge pin. Remove
hinge pin from coupler and swing tongue to side.
ATTENTION: INSTALL HINGE PIN IN STATIONARY SIDE OF SWING-
AWAY WHEN IN USE TO PREVENT LOSS OF DAMAGE.
INSTALLATION & PREPARATION
Torque Sequence
Wheel size 1st Stage 2nd Stage 3rd Stage
16" 20-25 50-60 80-90
1
2
34
5

14 HMT-4004-0MGH Operator's Manual
SET-UP:
1. This unit should only be placed on a level surface to ensure proper lubrication for the engine and water pump while
operating. Never spray water directly on the unit.
WARNING: DANGER RISK OF EXPLOSION OR FIRE! -WHEN CHARGING BATTERIES, THEY GENERATE
A HIGHLY EXPLOSIVE HYDROGEN GAS. A SPARK COULD CAUSE AN EXPLOSION OR FIRE!
-DO NOT JUMP START BATTERY UNLESS BOTH BATTERIES ARE OF EQUAL VOLTS & AMPS.
-DO NOT SMOKE OR ALLOW SPARKS OR FLAMES NEAR THE BATTERY.
-DO NOT PLACE UNIT IN AN AREA WHERE FLAMMABLE GAS VAPORS MAY BE PRESENT. A SPARK
COULD CAUSE AN EXPLOSION OR FIRE.
WARNING: RISK OF UNIT BURSTING! DO NOT STORE/OPERATE UNIT IN FREEZING ENVIRONMENTS!
WARNING: RISK OF ASPHYXIATION! USE THIS PRODUCT ONLY IN WELL VENTILATED AREAS! DO NOT
OPERATE IN AN ENCLOSED AREA. THE EXHAUST CONTAINS CARBON MONOXIDE, A POISONOUS,
ODORLESS AND INVISIBLE GAS. BREATHING THIS GAS CAN CAUSE SERIOUS INJURY, ILLNESS &
POSSIBLE DEATH.
2. Do not use unit in an area:
a. with insufcient ventilation.
b. where there is evidence of oil, gas or fuel leaks.
c. where ammable gas vapors may be present.
This unit has multiple ignition sources that could cause an explosion or re.
3. Do not allow the unit to be exposed to freezing temperatures. If any part of the unit becomes frozen, excessive
pressure may build up in the unit which could cause it to burst resulting in possible serious injury to the operator
or bystanders.
4. Pump oil level should be checked before each use. Check oil level on sight glass on backside of pump. Oil should
be half way up the sight glass. If the level appears to be low, ll with 10-40W non-detergent pump oil. The oil level
can also be checked by using the dipstik on the top of the pump.
5. Battery Specications:
- RV / Marine Dual Purpose Deep Cycle / Cranking Battery.
- BCI Group 24DC
- Battery Box Size: 11" L x 7 1/2" W x 8 1/4" H (Battery can be slightly taller and still be covered by lid.)
- Battery should have lifting strap for easy installation.
ATTIRE:
Proper attire is essential to your safety. It is advised to utilize whatever means neces-
sary to protect eyes, ears, and skin. Additional safety attire (such as respiratory mask)
may be required when using detergent cleaning agents with this washer.
INSTALLATION & PREPARATION

HMT-4004-0MGH Operator's Manual 15
ENGINE/BURNER FUEL TANKS:
1. Review "Risk of Explosion or Fire" warnings, pgs. 4-5, before fueling.
2. Locate the Safety Decals on your unit and heed their warnings.
3. Engines: See Engine Owner's Manual for fuel requirements.
Burner Fuel: When lling tank, use No. 1 or No 2 fuel oil/diesel or kerosene.
4. Check the engine oil level before starting the engine. (See Engine Manual.)
5. Refer to the Engine Manual supplied with this unit for proper engine adjustment procedures.
6. Review the Engine Manual accompanying this pressure washer for correct engine start-up and maintenance
procedures.
WARNING: DANGER RISK OF FIRE! DO NOT SMOKE WHILE FUELING! -DO NOT FILL THE FUEL TANKS
WHILE UNIT IS RUNNING OR HOT. ALLOW UNIT TO COOL FOR TWO MINUTES BEFORE REFUELING.
DO NOT FILL FUEL TANKS TO POINT OF OVERFLOWING. ALLOW APPROXIMATELY 1/4" OF TANK
SPACE FOR FUEL EXPANSION.
WARNING: RISK OF EXPLOSION OR FIRE! ALWAYS STORE FUEL AWAY FROM THE WASHER WHILE THE
UNIT IS RUNNING OR HOT.
DUAL LANCE ASSEMBLY WITH ADJUSTABLE PRESSURE:
This unit features a dual lance assembly with adjustable pressure which allows the user to select a high or low pres-
sure spray. Simply rotate the adjustable grip on the dual lance to achieve the desired pressure selection.
1. Selectionofhigh pressurecanbe achievedbyturningtheadjustablegripontheDualLanceassemblycounterclockwise.
2. Selection of low pressure can be achieved by turning the adjustable grip on the Dual Lance clockwise.
WARNING: RISK OF INJECTION CAUSING SEVERE INJURY! THE TRIGGER GUN SHOULD ALWAYS
BE LOCKED IN THE OFF POSITION WHEN NOT IN USE! NEVER LOOK DIRECTLY AT THE NOZZLE
UNLESS IT IS DISCONNECTED FROM THE TRIGGER GUN/DUAL LANCE ASSEMBLY!
INSTALLATION & PREPARATION

16 HMT-4004-0MGH Operator's Manual
QUICK-CONNECT NOZZLES:
Various nozzles may be quick-connected into the end of the dual lance to change the spray pattern. The detergent
nozzle has been pre-installed at the factory. When using quick-connects (Q.C.), be certain the connection is securely
locked as shown at right. If not, the high pressure water may shoot the nozzle from the lance, causing severe injury
or serious damage. To determine spray fan, refer to the actual number stamped on the nozzle. The rst two digits
indicate the spray fan degree: 00=0°, 15=15°, 25=25°, 40=40°, 65=65°.
1. The 0° nozzle (RED):
This is a blasting nozzle. It delivers a very concentrated stream of water. Be cautious when using the straight narrow
stream. It is not recommended for use on painted or wood surfaces or items attached with adhesive backing. Uses:
Removing weeds from sidewalk cracks, stubborn stains from concrete, masonry, aluminum and steel, caked mud
from equipment, and cleaning lawn mower undersides.
2. The 15° nozzle (YELLOW):
This is a chiseling nozzle. The spray should be directed at a 45° angle to the surface and used like a scraper to
remove paint, grease and dirt. Uses: Surface preparation (removing mildew stains and paint chips).
3. The 40° nozzle (WHITE):
This is a wash nozzle. This wide spray pattern disperses the water pressure over a large area and is recommended
for moderate washing. Uses: Washing aluminum siding, cleaning windows, washing vehicles, spraying sidewalks,
driveways, and patios.
4. The 25° nozzle (GREEN):
This is a ushing nozzle. This pattern is best suited for ushing dirt, mud, and grime. Uses: Wet sweeping leaves
from walks, curbs and driveways, cleaning stable oors, washing swimming pool bottoms, degreasing engines.
5. The 65° nozzle: (included in dual lance.)
This is a detergent nozzle. The broad spray pattern distributes solution over vast areas. Uses: Detergent application,
misting or rinsing.
NOZZLE CONNECTION:
1. Ensure the trigger gun is locked in the OFF position.
2. Quick-connect nozzles can be connected or disconnected from the dual lance assembly by retracting the locking
ring on the quick-connect tting. When connecting the desired nozzle, push the locking ring over the quick connect
nozzle to secure connection.
INSTALLATION & PREPARATION
NOZZLES NOZZLE LOCK
NOZZLE CONNECTION

HMT-4004-0MGH Operator's Manual 17
WATER SUPPLY:
PRESSURIZED SUPPLY:
1. Select a water supply hose which is a quality grade of garden hose measuring at least ¾” ID and no longer than
50 feet.
2. Ensure the water strainer is clean and free of obstructions. If water ow becomes restricted to the pump, cavitation
can occur which will cause premature failure of the pump packings.
3. Connect one end of the water supply hose to the swivel with lter inlet and connect the other end to the pressurized
water supply.
NOTE: If there is a high mineral content in your water, it is recommended that a water softener be used to prevent the
possibility of excessive scale buildup inside the heat exchanger coil.
4. Follow the incoming water requirements listed below:
a. Water pressure must be between a minimum of 40 PSI and a maximum of 65 PSI.
b. Incoming GPM must be approximately one gallon more per minute than the outgoing GPM stated on the machine
nameplate. (You can check the GPM of yoursource by timing the lling of a 5 gallon container.)
c. Incoming water temperature must not exceed 125°F. Excessive pump damage may result if the water temperature
exceeds this level.
5. Never allow the unit to operate without the incoming water line attached and the water supply completely turned
on.
UNLOADER:
The unloader has been preset at the factory.
PRE-START INSPECTION PROCEDURES:
Before starting the unit, perform the following procedures:
1. Check the oil level in the pump.
2. Inspect the water inlet strainer. Clean or replace if necessary. See "Water Supply".
3. Check all hose connections to ensure they are securely tightened.
4. Inspect for system water leaks, oil leaks and fuel leaks. If a fuel leak is found, DO NOT START UNIT! See "Risk of
Explosion or Fire" warnings. Be sure that all damaged parts are replaced and that the mechanical problems are
corrected prior to operation of the unit. If you require service, contact Customer Service.
5. Inspect high pressure hoses for kinking, cuts and leaks. If a cut or leak is found, DO NOT USE HOSE! Replace
hose before starting unit. See "Risk of Injection" warnings.
6. Be sure that all damaged parts are replaced and that the mechanical problems are corrected prior to operation of
the unit. If you require service, contact Customer Service.
INSTALLATION & PREPARATION
END OF PREPARATION INSTRUCTIONS

18 HMT-4004-0MGH Operator's Manual
WARNING
THE FOLLOWING PAGES CONTAIN OPERATING INSTRUCTIONS.
DO NOT ATTEMPT TO TOW YOUR HOT WATER TRAILER UNTIL YOU HAVE READ AND
UNDERSTOOD ALL SAFETY PRECAUTIONS AND INSTRUCTIONS LISTED IN THIS MANUAL.
INCORRECT OPERATION CAN CAUSE SERIOUS INJURY!!
DO NOT ALTER OR MODIFY THIS EQUIPMENT
IN ANY MANNER!

HMT-4004-0MGH Operator's Manual 19
WHILE TOWING TRAILER:
WARNING: NEVER ALLOW A PERSON TO RIDE IN OR ON A TRAILER THAT IS BEING TOWED. ALL
STATES PROHIBIT PASSENGERS IN TOWED VEHICLES. A PERSON CAN FALL OFF AND BE STRUCK
BY ANOTHER VEHICLE OR RUN OVER BY THE TOWED TRAILER. FAILURE TO OBSERVE THIS
WARNING CAN RESULT IN DEATH.
SAFETY PRECAUTIONS DURING USE
Loading Trailer. The trailer should be loaded so that the downward tongue weight is approximately 10% of the gross
trailer weight. Hitch only to the hitch points recommended by the tow vehicle manufacturer.
Following and stopping distance. The stopping distance increases when towing a trailer. A rule of thumb for the
minimum distance that should be maintained between you and the preceding car on dry pavement is one car and
trailer length (2 car lengths) for every 10 MPH you are traveling. The distance should be increased accordingly de-
pending on road and weather conditions. Avoid sudden stops if possible. Operate tow vehicle smoothly - no jerky
turns, starts or stops. When possible, avoid operating the tow vehicle near ditches, embankments and holes and
reduce speed when crossing uneven or rough terrain.
Passing. Accelerating and passing should be done slowly to allow extra distance for passing. Signal well in advance
when passing and returning to the proper lane. Allow for the extra length of the trailer before changing lanes. Never
change lanes abruptly as this may cause the trailer to sway and push the tow vehicle into a "jack knife" condition.
Turning. Allow for the extra length of the trailer. Drive slightly beyond normal turning point to avoid running over
curbs and soft shoulders. Turning radius increases when towing. Reduce speed when turning, crossing slopes and
on rough, slick or muddy surfaces.
Uphill and Downhill Grades. Reduce speed and use a lower transmission gear for steep or long up or down hill
grades. Maintain safe distance from other vehicles.
Parking. When tow vehicle is idle, engage brakes and park lock securely.
• Avoid parking on uphill or downhill grades.
• Place transmission in "PARK".
• Apply parking brake.
• Use wheel chucks.
• In parking lot, avoid parking close to other vehicles. Turning radius is greater and it may be impossible
to get out of a parking space after a few other vehicles have parked around your vehicle.
ALWAYS TURN OFF TOW VEHICLE ENGINE BEFORE MAKING ADJUSTMENTS OR REPAIRS TO AN
ATTACHED TRAILER.
AFTER USE:
1. Inspect trailer for wear or damage.
2. Ensure that all fasteners and ttings are tight.
3. Verify the stop, tail and turn signals are working properly.
4. Check wires for good connections and possible fraying or wearing of insulation.
5. Check and properly maintain the trailer, hitch, jack, ball and coupler.
6. Inspect hitch and ball for damage. Ball or hitch can be damaged in parking, hitting curbs, dragging when crossing
ditches or railroad tracks.
7. Check and properly tighten all bolts on trailer, hitch, ball and coupler (including wheels).
8. Check safety chains for wear and do not allow them to drag on ground or roadway.
9. Check tow vehicle tires for wear and proper ination (check vehicle's owner manual for proper level of ination of
tires for towing a trailer).
10. Check trailer tires for wear and proper ination. Replace only with a tire of the same size and capacity ratings.
11. For proper tow vehicle maintenance while towing a trailer, check vehicle's owner manual and manufacturer's
specications.
OPERATING INSTRUCTIONS

20 HMT-4004-0MGH Operator's Manual
FLUSHING THE SYSTEM:
This unit has a steel coil which, after sitting, will cause the water remaining in the coil from the previous usage to
turn brown or black. This water must be ushed from the system before start-up. This procedure should be per-
formed WITHOUT the high pressure hose, gun and lance assembly installed.
1. Turn on the water supply.
2. Start engine on unit. Low pressure water will begin owing from the water outlet. This allows the unit to ush any
particles from the system. The unit is ushed when the water is clear.
3. Once the system is ushed, turn off engine and connect the high pressure hose to the water outlet of the unit.
4. Connect the trigger gun and dual lance assembly to the high pressure hose.
5. Install desired nozzle into dual lance assembly.
WARNING: CAUTION RISK OF UNIT DAMAGE. BE CERTAIN THE HOSE, GUN AND NOZZLE ASSEMBLY
ARE NOT CONNECTED TO THE UNIT WHILE FLUSHING THE SYSTEM. FLUSHING ALLOWS
MINERAL DEPOSITS TO BE RELEASED FROM THE SYSTEM WHICH WOULD OBSTRUCT OR
DAMAGE THE GUN AND NOZZLE ASSEMBLY RESULTING IN COSTLY REPAIRS.
START-UP/COLD WATER OPERATION:
1. Refer to the Safety Warnings before starting the machine.
2. Locate the Safety Decals on your unit and heed their warnings.
3. Ensure the Burner Switch is in the OFF position.
4. Pointing the trigger gun in a safe direction, unlock the trigger gun and squeeze the trigger. Hold the trigger gun
open while starting the engine according to the manufacturer’s instructions in the engine manual accompanying
the machine. Brace yourself for possible gun kickback when the engine starts.
WARNING: CAUTION RISK OF DAMAGE. DO NOT ALLOW SPRAY PATTERN TO REMAIN ON A FIXED
AREA FOR AN EXTENDED PERIOD OF TIME. POSSIBLE DAMAGE MAY OCCUR TO THE AREA.
5. Once the engine has started, perform the following procedures with the gun open:
a. Inspect for system water leaks, oil leaks, and fuel leaks. If a fuel leak is found, TURN MACHINE OFF IMMEDIATELY!
See “Risk of Explosion or Fire” warnings. Be sure that all damaged parts are replaced and that all mechanical
problems have been corrected prior to operation of the unit. Contact Customer Service if necessary.
b. Inspect high pressure hoses for kinks, cuts, and leaks. If a cut or leak is found, TURN MACHINE OFF
IMMEDIATELY! Replace hose before starting the machine. See “Risk of Injection” warnings. Be sure that all
damaged parts are replaced and that all mechanical problems have been corrected prior to operation of the
unit. Contact Customer Service if necessary.
6. The unit is now operating as a cold water pressure washer. Trigger the gun several times. Rotate adjustable grip
on the dual lance for high and low pressure application. NEVER place hand or ngers in front of the nozzle or look
directly into the nozzle!
DANGER RISK OF INJECTION CAUSING SEVERE INJURY! KEEP CLEAR OF NOZZLE! NEVER PLACE
HAND OR FINGERS IN FRONT OF NOZZLE! DO NOT DIRECT DISCHARGE STREAM AT PEOPLE OR
PETS!
7. Do not allow the machine to operate in the bypass mode (with the trigger gun closed) for more than three minutes
without triggering the gun. Failure to follow this simple rule can cause premature failure of the pump packings.
ADJUSTABLE GRIP
OPERATING INSTRUCTIONS