Mi-T-M HSD-SERIES User manual

HSD-SERIES Operator's Manual 1
©Copyright 2005, Mi-T-M Corporation® Form #37-0490-091505
CAUTION
RISK OF INJURY!
READ MANUAL BEFORE OPERATING!
This manual is an important part of the pressure washer and must
remain with the unit when you sell or rent it!
OPERATOR'S MANUAL FOR
HSD-SERIES
HOT WATER
PRESSURE WASHERS
(UTILIZES EMF SYSTEM PATENT #5,954,494)

2 HSD-SERIES Operator's Manual
TABLE OF CONTENTS
INTRODUCTION ...................................................................................................................... 3
IMPORTANT SAFETY WARNINGS ..................................................................................... 4-7
RISK OF EXPLOSION OR FIRE ................................................................................. 4
RISK OF ASPHYXIATION ........................................................................................... 5
RISK OF INJECTION OR SEVERE CUTTING INJURY ............................................. 5
RISK OF ELECTROCUTION OR ELECTRICAL SHOCK ........................................... 5
RISK OF BURNS ......................................................................................................... 5
RISK OF BURSTING ................................................................................................... 6
RISK FROM MOVING PARTS .................................................................................... 6
RISK OF BODILY INJURY .......................................................................................... 7
FEATURES ........................................................................................................................... 8-9
INSTALLATION & PREPARATION .................................................................................. 10-12
ATTIRE 10
SET-UP ...................................................................................................................... 10
ENGINE/BURNER FUEL TANK ................................................................................ 10
DUAL LANCE ASSEMBLY WITH ADJUSTABLE PRESSURE ...................................11
WATER SUPPLY ........................................................................................................11
UNLOADER ............................................................................................................... 12
HEAT DUMP VALVE .................................................................................................. 12
PRE-START INSPECTION PROCEDURES ............................................................. 12
OPERATING INSTRUCTIONS ......................................................................................... 14-15
FLUSHING THE SYSTEM ........................................................................................ 14
START-UP/COLD WATER OPERATION ................................................................... 14
HOT WATER OPERATION ........................................................................................ 15
CLEANING WITH DETERGENTS ............................................................................ 15
SHUTDOWN ............................................................................................................. 15
STORAGE & MAINTENANCE .......................................................................................... 16-17
SPECIFIC MAINTENANCE ...................................................................................... 16
WINTERIZING ........................................................................................................... 17
TROUBLESHOOTING ...................................................................................................... 18-19
MAINTENANCE CHART ....................................................................................................... 20
ACCESSORIES ..................................................................................................................... 21
STATEMENT OF WARRANTY .............................................................................................. 22
NOTES ................................................................................................................................. 23

HSD-SERIES Operator's Manual 3
INTRODUCTION
Congratulations on the purchase of your new Mi-T-M hot water pressure washer featuring the patent pending Electro
Magnetic Firing (EMF) system! You can be assured your Mi-T-M hot water pressure washer was constructed 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 benefit. 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 Mi-T-M hot water pressure washer. The contents of this manual are based on the latest product information
available at the time of publication. Mi-T-M reserves the right to make changes in price, color, materials, equipment,
specifications 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 uncrated, immediately write in the serial number of your unit in the space provided below.
SERIAL NUMBER_________________________________
Inspect for signs of obvious or concealed freight damage. If damage does exist, file 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 Mi-T-M Customer Service at [phone].
Please have the following information available for all service calls:
1. Model Number
2. Serial Number
3. Date and Place of Purchase
Mi-T-M Corporation
8650 Enterprise Drive
Peosta, IA 52068

4 HSD-SERIES Operator's Manual
POTENTIAL CONSEQUENCE PREVENTION
SAFETY WARNINGS
WARNING: When using this product, precautions should always be observed, including the following.
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.
Serious injury or death may occur
as a result of improper fueling.
Serious injury or death may occur
from the battery.
Serious injury or death may occur
from a ground fire caused by a
muffler spark.
Serious injury or death may occur
if system safety's are not properly
maintained.
Always operate pressure washer in a well
ventilated area free of flammable vapors,
combustible dust, gases or other combustible
materials.
Do not store the pressure washer near an open
flame 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
flammable material!
Do not smoke while filling fuel tanks.
Never fill 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 ventilated
area.
Always refuel slowly to avoid the possibility of
spilled fuel which may cause a risk of fire.
Engine Fuel Tank (Red):
If using a Gasoline Engine, refuel with
gasoline only. Do not use diesel or fuel
oil.
Diesel Fuel Tank (Black):
If using a Diesel Engine, refuel with
diesel only. Do not use gasoline.
Burner Fuel Tank (Black):
When refueling the Burner Fuel Tank, use
No. 1 or No. 2 fuel oil/diesel or kerosene.
Do not use gasoline.
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, hydrogen
and oxygen gases in the battery are extremely
explosive. Keep open sparks and flames away
from the battery at all times, especially when
charging the battery.
Be certain to disconnect the battery ground
terminal before servicing. When disconnecting
the cable from the battery, start with the negative
terminal, and when connecting them, start with
the positive one.
When charging the battery, remove the battery
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 amperage.
A spark arrester must be added to the muffler
of this engine if it is to be used on any forest
covered, brush covered or grass covered
unimproved land. 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 of the California
Public Resources Code.) Other states may
have similar laws. Federal laws apply on
Federal lands.
This pressure washer has a Safety Relief
device which should never be altered, modified,
removed or made inoperative. If the device
fails, replace immediately with only genuine
manufacturer replacement part.
HAZARD

HSD-SERIES Operator's Manual 5
POTENTIAL CONSEQUENCE PREVENTION
SAFETY WARNINGS
READ ALL SAFETY WARNINGS BEFORE USING PRESSURE WASHER
Serious injury or death may occur
from inhaling engine/burner
exhaust or dangerous vapors.
The engine exhaust from this
product contains chemicals known
to the State of California to cause
cancer, birth defects, or other
reproductive harm.
This pressure washer was designed for
outdoor use only. 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 ventilated 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 working
with some materials. Do not use this
pressure washer to dispense hazardous
detergents.
Serious injury or death could
occur from high pressure spray
penetrating the skin.
Keep clear of nozzle and spray! Never put
your hand, fingers or body directly over the
spray nozzle.
Never point the high pressure discharge spray
at yourself or anyone else.
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 evidence
of failure exists, promptly replace all suspect
hoses and fuel lines to prevent the possibility of
injury from the high pressure spray. If a hose
or fitting is leaking, NEVER PLACE YOUR
HAND DIRECTLY ON THE LEAK.
NEVER operate the gun with the trigger wired
in the open position. To prevent accidental
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.)
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.
RISK OF
ASPHYXIATION
RISK OF INJECTION
OR
SEVERE CUTTING INJURY
HAZARD

6 HSD-SERIES Operator's Manual
RISK OF BURNS
RISK FROM MOVING PARTS
POTENTIAL CONSEQUENCE PREVENTION
SAFETY WARNINGS
READ ALL SAFETY WARNINGS BEFORE USING PRESSURE WASHER
Serious injury may occur from
touching the gasoline engine,
muffler 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.
Serious injury or death may occur
if attempting to start the pressure
washer when the pump is frozen.
Never make adjustments to the factory set
pressures.
Never exceed manufacturers maximum
allowable pressure rating of attachments.
Do not allow any hoses to make contact
with the engine muffler, gasoline engine 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
always 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 underheated
vehicle without first allowing the pump to
thaw.
RISK OF BURSTING
Before making any adjustments, be certain
the engine is turned off and the ignition
cable(s) is removed from the spark plug(s).
Turning the machinery over by hand during
adjustment 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
gasoline engine, muffler or heat exchanger.
HAZARD
Serious injury may occur to the
operator from moving parts on the
pressure washer.

HSD-SERIES Operator's Manual 7
RISK OF BODILY INJURY
SAFETY WARNINGS
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.
Injury may occur from the pressure
washer.
SEEK EMERGENCY MEDICAL CARE if
you are using cleaning agents and the spray
appears 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, especially
when using cleaning detergents.
Keep all detergents out of the reach of
children!
ALWAYS wear protective goggles when
operating the unit to shield the eyes from flying
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
influence 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 protective
foot gear and keep good footing and balance
at all times.
NEVER trigger the gun while on a ladder or
roof.
ALWAYS hold on firmly 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.
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 inspected and
repaired by a qualified service person.
NEVER run the unit with the governor
disconnected or operate at excessive
speeds.
Place unit in a clean, dry, flat 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, flat area. If applicable, block wheels to
prevent unit from moving.
Do not move the unit by pulling on the hose.
POTENTIAL CONSEQUENCE PREVENTION
!SAVE THESE INSTRUCTIONS!
HAZARD

8 HSD-SERIES Operator's Manual
0MHSD019-070700-RD
HSD-SERIES FEATURES

HSD-SERIES Operator's Manual 9
FEATURES LISTING
1. Burner On/Off Switch
2. Burner Fuel Shut Off Valve
3. Decal-Caution: Battery
4. Decal-Warning: Beltguard
5. Skid Foot
6. Engine Oil Drain Plug
7. Roll Cage
8. Four Point Lift
9. Gun/Lance Holder
10. Decal-Warning: Muffler Hot
11. Beltguard
12. Heat Exchanger Exhaust
13. Water Float Tank
14. Water Inlet Strainer
15. Water Inlet
16. Burner Air Regulation
17. Water Outlet
18. Coil Drain Plug
19. Engine Fuel Tank
20. Decal-Caution: Risk of Fire
21. Burner Diesel Fuel Tank (Black)
22. Decal-Caution: Risk of Fire-Diesel/Fuel Oil
23. Detergent Metering Valve
24. Easy Start Valve
25. High Pressure Pump
26. Pump Oil Drain Plug
27. Decal-Warning: Hot Coil Exhaust
28. Burner Fuel/Water Separator
29. Decal-Warning/Caution/Operation
30. Decal-Warning: Do Not Modify Plumbing
31. Data Plate
32. Hose Reel Receiver
33. High Pressure Discharge Hose
34. Trigger Gun
35. Trigger Safety Lock
36. Insulated Dual Lance
37. Nozzle
38. Optional Wheel Kit (HX-0048)
SPECIFIC UNIT INFORMATION
BODY/FRAME: One piece, welded construction, full Roll
Cage with Four Point Lift.
FINISH: Powder coated
HIGH PRESSURE HOSE: 3/8" x 50'
TRIGGER GUN ASSEMBLY: Trigger controlled, safety
lockoff, insulated Dual Lance.

10 HSD-SERIES Operator's Manual
INSTALLATION & PREPARATION
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.
2. Do not use unit in an area:
a. with insufficient ventilation.
b. where there is evidence of oil, gas or fuel leaks.
c. where flammable gas vapors may be present.
This unit has multiple ignition sources that could cause an explosion or
fire.
3. If applicable, be certain to block the wheels to prevent the unit from moving
while operating.
4. Do not allow the unit to be exposed to rain, snow or 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.
5. Pump oil level should be checked before each use. Check the oil level
indicator on the pump crankcase. Make certain the oil is in the center of
the oil sight glass. If the level appears to be low, fill with Mi-T-M pump oil
#AW-4085-0016.
6. Your pressure washer is equipped with an Electric Starter. On initial start-
up, wear proper eye and skin protection when filling the battery with acid.
Fully charge the battery to allow Electric Starter to function.
ATTIRE:
Proper attire is essential to your safety. It is advised to utilize whatever
means necessary to protect eyes, ears, and skin. Additional safety attire
(such as respiratory mask) may be required when using detergent cleaning
agents with this washer.
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.
RISK OF UNIT BURSTING!
DO NOT STORE/OPERATE UNIT
WARNING
RISK OF EXPLOSION OR FIRE!
ALWAYS STORE FUEL AWAY
FROM THE WASHER WHILE THE
UNIT IS RUNNING OR HOT.
DANGER
RISK OF FIRE!
-DO NOT SMO KE W HIL E
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 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.
ENGINE/BURNER FUEL TANKS:
1. Review "Risk of Explosion or Fire" warnings, pg. 4, before fueling.
2. Locate the Safety Decals on your unit and heed their warnings.
3. Gasoline Engines:
When filling (red) tank, gasoline fuel should be a minimum of 85 octane.
DO NOT MIX OIL WITH GASOLINE. Gasoline fuel should be purchased
in quantities that may be used within 30 days. Use of clean, fresh lead-free
gasoline is recommended. Leaded gasoline may be used if lead-free is
unavailable. DO NOT use gasoline containing methanol or alcohol.
Diesel Fueled Engines:
When filling (black) tank, diesel fuel should be a minimum of 45 cetane.
Diesel fuel oil substitutes are not recommended. Diesel fuel should be free
of water and dirt.
Burner Fuel:
When filling (black) 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.

HSD-SERIES Operator's Manual 11
INSTALLATION & PREPARATION
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 pressure "fan" spray. Simply rotate
the adjustable grip on the dual lance to achieve the desired pressure
selection.
1. Selection of high pressure can be achieved by turning the adjustable grip
on the Dual Lance assembly counterclockwise as shown in the figure
below.
2. Selection of low pressure detergent application can be achieved by turning
the adjustable grip on the Dual Lance clockwise as shown in the figure
below. Once the pressure is low enough, the detergent injector on the
pressure washer will draw detergent into the system. A water/detergent
mixture exits from both the spray nozzle and detergent nozzle.
DUAL LANCE CONNECTION:
1. Be certain the trigger gun is locked in the "OFF" position.
2. Connect the dual lance assembly to the trigger gun assembly at this
time (if applicable). Be certain the connection is securely tightened.
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!
WATER SUPPLY:
1. Select a water supply hose which is a quality grade of garden hose
measuring at least 3/4" ID and no longer than 50'.
2. Check the water inlet strainer to ensure it is clean and free of any
obstructions. As a strainer becomes obstructed, it restricts proper flow
of water to the pump. This can result in cavitations which will cause
premature failure of pump packings.
a. Unscrew the strainer cap from the unit.
b. Remove the strainer screen and clean or replace.
3. Connect one end of the water supply hose to the water inlet of the unit.
Connect the other end of the hose to your 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 20 pounds per square
inch (PSI) and a maximum of 125 PSI.
b. Incoming GPM must be approximately one gallon more than the
outgoing GPM stated on the pressure washer nameplate.
(You can check GPM by timing how long it takes to fill a 5 gallon
container)
c. Incoming water temperature must not exceed 125°F. Excessive
pump damage may result if the water temperature exceeds this
acceptable level.
5. Never allow the unit to operate without the incoming water line attached
and the water supply completely turned on.
WATER INLET STRAINER

12 HSD-SERIES Operator's Manual
INSTALLATION & PREPARATION
END OF PREPARATION INSTRUCTIONS
UNLOADER:
The unloader has been preset at the factory and should only be adjusted by a
trained Mi-T-M Service Representative.
HEAT DUMP VALVE:
To ensure the bypass water temperature does not exceed acceptable levels,
never allow the pressure washer to operate in the bypass mode (with the unit
running and the trigger closed) for more than three minutes.
A heat dump valve has been added to this unit to protect the pump. It may
begin to open and release water if the water temperature in the pump has
exceeded 140° F. This will allow fresh, cool water to enter the system.
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", #2, pg. 11.
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,
pg. 4. 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, pg. 5. 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.

HSD-SERIES Operator's Manual 13
WARNING
THE FOLLOWING PAGES CONTAIN OPERATING AND
MAINTENANCE INSTRUCTIONS
DO NOT ATTEMPT TO OPERATE THIS PRESSURE WASHER UNTIL
YOU HAVE READ AND UNDERSTOOD ALL SAFETY
PRECAUTIONS AND INSTRUCTIONS LISTED IN THIS MANUAL.
INCORRECT OPERATION OF THIS UNIT CAN CAUSE SERIOUS
INJURY!!
DO NOT ALTER OR MODIFY THIS EQUIPMENT IN ANY MANNER!

14 HSD-SERIES Operator's Manual
OPERATING INSTRUCTIONS
FLUSHING THE SYSTEM:
This unit has a steel coil which, after setting, will cause the water remaining in
the coil from the previous usage to turn brown or black. This water must be
flushed from the system before start-up. This procedure should be performed
WITHOUT the high pressure hose, gun and lance assembly installed.
1. Turn on the water supply.
2. Start the engine following the start-up procedures given in the Engine Manual
accompanying this unit.
3. Adjust the engine to a low speed until you see water exiting the water
outlet. (This may take 3-5 minutes) Adjust the engine throttle back to full
RPM.
4. Once the system is flushed, stop the engine and connect the high pressure
discharge hose to the water outlet of the unit.
5. Connect the dual lance to the trigger gun assembly.
START-UP/COLD WATER OPERATION:
1. Refer to the "Safety Warnings" pgs. 4-7 before starting the unit.
2. Locate the Safety Decals on your unit and heed their warnings.
3. Ensure that 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 this
unit. Brace yourself for possible gun kickback when the pump starts.
5. Once the engine has started, ensure the engine throttle is adjusted to full
RPM and 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 UNIT OFF IMMEDIATELY! See "Risk of Explosion or Fire"
warnings, pg. 4. 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.
b. Inspect high pressure hoses for kinking, cuts and leaks. If a cut or
leak is found, DO NOT TOUCH HOSE AT LEAK! TURN UNIT OFF
IMMEDIATELY! Replace hose before starting the unit. See "Risk of
Injection" warnings, pg. 5. 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.
6. At this point, the unit is operating as a cold water pressure washer. Trigger
the gun several times. NEVER place hand or fingers in front of the nozzle
or look directly into the nozzle! High pressure water creates a risk of severe
injury!
7. Do not allow unit to operate in bypass mode (with trigger closed) for more
than three minutes without triggering the gun. Failure to follow this simple
rule can cause premature failure of pump packings, resulting in costly pump
repair.
8. Your pressure washer can deliver high pressure spray and a variety of spray
patterns using cold water. If you wish to use the Hot Water application or
Cleaning with Detergents, see pg. 15 for the correct procedures.
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.
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!
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.

HSD-SERIES Operator's Manual 15
HOT WATER OPERATION:
1. Follow the steps outlined for "START-UP/COLD WATER OPERATION."
2. Move the burner switch to the ON position. On initial start-up, water will
begin turning hot in approximately 20 seconds and will reach maximum
temperature in approximately 2-1/2 minutes provided the trigger remains
squeezed. The burner will stop firing when the trigger is released.
NOTE: While spraying, it is normal for the burner to fire intermittently. The
high limit switch will cause combustion to cease when the temperature
of the discharged water exceeds the temperature setting of the switch.
Combustion will begin again when the water temperature drops below
the minimum setting.
At this point, the unit is operating as a hot water pressure washer. Be certain
to be extremely cautious when adjusting the pressure and controlling the
trigger gun/lance assembly to avoid the possibility of burns.
CLEANING WITH DETERGENTS-HIGH PRESSURE:
NOTE: This feature is designed for use with mild detergents only. Since the
cleaning solution travels through the pump and heat exchanger coil,
do not use corrosives as they will cause extensive damage as well as
pose a considerable safety hazard.
1. Refer to "Risk of Bodily Injury" warnings, pg. 7. Be certain to wear protective
safety attire as stated on pg. 10.
2. Prepare detergent solution according to label directions. (Never pump acids,
alkalines, abrasive fluids or solvents through the unit. Due to the unknown
and often corrosive characteristics of many detergents commonly used
in the pressure washer cleaning industry, it is recommended to use only
Mi-T-M detergents with this unit.)
3. Fully immerse the strainer end of the clear vinyl detergent hose into the
detergent solution.
4. Adjust the amount of detergent desired by turning the detergent metering
valve completely counterclockwise to set at maximum siphon rate.
NOTE: Selection of low pressure detergent application can be achieved by
turning the adjustable grip on the Dual Lance clockwise as shown
in the figure below. Once the pressure is low enough, the detergent
injector on the pressure washer will draw detergent into the system. A
water/detergent mixture exits from both the spray nozzle and detergent
nozzle.
5. To apply solution: unlock the trigger gun and squeeze the trigger. In a few
moments, a detergent/water mixture will exit the nozzle. Start spraying
the lower portion of the surface being cleaned and move up, using long
overlapping strokes. Applying from the bottom up helps avoid streaking.
Allow to soak briefly. Avoid working on hot surfaces or in direct sunlight to
minimize the chances of the detergent drying, which may result in damaging
surfaces. Be certain to apply cleaning solution to a small section at a
time.
6. To rinse: lock the trigger gun in the OFF position. Turn the detergent
metering valve to the OFF position. Unlock the trigger gun and spray. It
will take about 30 seconds to purge all detergent from the line. For best
rinsing results, start at the top and work down.
7. Siphon a gallon of water through the detergent injection system after each
use. This prevents the possibility of corrosion or detergent residue causing
mechanical problems during the next use.
SHUTDOWN:
1. Move the burner switch to the OFF position.
2. Squeeze the trigger and discharge the water for three minutes to cool the
heat exchanger and high pressure hose. (Insufficient cool down period of
the high pressure hose will cause excessive wear and eventual rupturing
of the hose.)
3. On the gasoline engine models, DO NOT close the choke to stop the engine.
Backfire or engine damage may occur.
4. Move the engine On/Off switch to the OFF position.
5. Turn off the water supply and trigger the gun momentarily to relieve trapped
pressure.
6. Disconnect the high pressure hose, gun, and lance. Drain and wipe the
unit clean. Store in a non-freezing environment.
OPERATING INSTRUCTIONS
WARNING
RISK OF BURN!
THE WATER TEMPERATURE
COULD BECOME VERY HOT
DURING HOT WATER OPERA-
TION. BE CAUTIOUS WHEN
ADJUSTING PRESSURE OR
CONTROLLING THE TRIGGER
GUN/LANCE ASSEMBLY.
DETERGENT METERING VALVE
ADJUSTABLE GRIP

16 HSD-SERIES Operator's Manual
STORAGE & MAINTENANCE
SPECIFIC MAINTENANCE:
ENGINE: The engine instruction manual accompanying your unit lists the
specific procedures for maintenance on the engine. Following the
engine manufacturer's recommendations will extend engine life.
PUMP: Change the pump oil after the first 50 hours of operation. After
initial change, the manufacturer recommends changing the oil
every 3 months or at 250 hour intervals. If oil appears dirty or milky,
changes may be required in greater frequency. Use Mi-T-M pump
oil (#AW-4085-0016) and fill only to the center of the oil sight glass.
DO NOT overfill.
QUICK COUPLERS: There are o-ring seals inside the couplers which will
deteriorate. To replace, simply install a replacement o-ring to correct
the leak. (Additional o-rings can be purchased from your dealer.)
NOZZLE: Water flow through the spray nozzle will erode the orifice, making
it larger, resulting in a pressure loss. Nozzles should be replaced
whenever pressure is less than 85% of the maximum. The frequency
of replacement will depend upon such variables as mineral content
in the water and number of hours the nozzle is used.
FUEL WATER SEPARATOR: The fuel filter has a built in water separator.
Occasionally the water has to be drained from the separator. Follow
the procedures listed below:
1. Check the collection bowl daily.
2. Ensure the unit is off and place an oil catch basin under the
fuel cartridge.
3. Loosen the drain plug to allow the fuel/water contaminants to
flow into the catch basin.
4. Retighten the drain plug when completed.
5. Dispose of drainage according to environmental regulations
in your area.
BURNER AIR ADJUSTMENT: The air shutter has been factory preset for proper
operation between sea level and 2000 feet elevation at standard
conditions (60°F ambient water and air temperatures). To assure
maximum combustion efficiency at colder temperatures and higher
altitudes, it will be necessary to increase the air supply to the
combustion chamber. A smoke spot test is recommended during
any air shutter adjustment. This will aid in maximizing the burner
efficiency and avoid inefficient operation and excessive sooting of
the heat exchanger coil.
1. The machine must be running and the burner ON.
2. Take a smoke spot test to determine if more or less air is
required for proper combustion.
a. If the test is greater than a No. 3 smoke, turn the shutter
arm clockwise to increase the air flow into the
combustion chamber.
b. If the test is yellowish in color, turn the shutter arm
counterclockwise to decrease the air flow into the
combustion chamber.
3. Hold onto the air shutter adjusting arm and loosen the locking
nut. Move the shutter in 1/8" increments and retighten the
locking nut after each 1/8" movement.
4. Trigger the gun on and off slowly to make sure there is proper
ignition. Slight or no puffing on the ignition, and a smoke spot
test of less than No. 3 smoke is good.
5. Repeat steps 2 & 3 until step 4 is attained.
LEAKS: Promptly eliminate any leaks found in the pumping system by
removing suspect parts, applying thread sealant to the threads
and reinstalling.
NOTE: If using teflon tape, be certain no tape gets inside any plumbing to
prevent the possibility of a plugged spray nozzle.

HSD-SERIES Operator's Manual 17
STORAGE & MAINTENANCE
WARNING
RISK OF UNIT BURSTING.
DO NOT STORE / OPER-
ATE UNIT IN A FREEZING
ENVIRONMENT!
COIL DRAIN PLUG
WINTERIZING:
For storage and transportation purposes in subfreezing ambient
temperatures, it will be necessary to winterize this unit. This unit must be
protected to the lowest incurred temperature for the following reasons:
1. If any part of the pumping system becomes frozen, excessive pressure
may build up in the unit which could cause the unit to burst resulting in
possible serious injury to the operator or bystanders.
2. The pumping system in this unit may be permanently damaged if frozen.
FREEZE DAMAGE IS NOT COVERED BY WARRANTY.
If you must store your unit in an area where the temperature may fall
below 32°F, you can protect your unit by following the procedure outlined
below.
1. Gather the following items:
a. Two 5 gallon containers.
b. One gallon of antifreeze. (Use an environmentally safe
antifreeze.)
c. Water supply.
2. Procedure:
a. Mix antifreeze and water in a container that can be used for pouring
the solution into the float tank.
NOTE: Proper winterizing is based on the recommended manufacturer's
instructions listed on the "Protection Chart" shown on the back label
of most antifreeze containers.
b. To start winterizing, unit must be run according to the "Start-Up/Cold
Water Operation" listed on pg. 14.
c. After running, shut off the unit and water supply.
d. Relieve system pressure by pointing the trigger gun in a safe
direction and squeezing the trigger until water flow ceases to exit
the nozzle.
e. Lock the trigger gun in the OFF position and remove the nozzle.
f. Remove lid from the float tank.
g. Start the unit and squeeze the trigger gun until the float tank is almost
empty. Release trigger.
h. Carefully pour antifreeze solution into float tank.
i. Point the trigger gun into the empty container. Trigger the gun until
the antifreeze begins to exit the trigger gun.
j. Stop the unit.
k. Disconnect the hose and trigger gun from the unit and drain any
excess antifreeze back into the 5 gallon container.
l. Drain hose, trigger gun and lance assembly and store with the unit
in a safe non-freezing area.
m. Store antifreeze solution for next use or dispose of according to state
EPA laws.
OPTIONAL PROCEDURE:
a. Shut off the unit and water supply.
b. Relieve system pressure by pointing the trigger gun in a safe
direction and squeezing the trigger until water flow ceases to exit
the nozzle.
c. Disconnect and drain the hose, trigger gun and lance assembly.
d. Remove the coil drain plug from the heat exchanger inlet.
e. Start the unit and allow it to run until all the water exits the unit. Once
the water has stopped flowing from the unit, turn unit off.
NOTE: When using this procedure, use caution as ice chips can form from
drops of water which could cause the unit to burst if starting before
completely thawed.
32˚F 0˚C

18 HSD-SERIES Operator's Manual
TROUBLESHOOTING
SYMPTOM PROBABLE CAUSE REMEDY
Engine will not start. Engine problems. Refer to the Engine Manual
accompanying your unit.
Unit components are frozen. Allow to thaw. If any part of the unit
becomes frozen, excessive
pressure may build up in the unit
which could cause the unit to burst
resulting in possible serious injury to
the operator or bystanders.
No discharge at nozzle when Inadequate water supply. Ensure hose is 3/4" diameter and
trigger mechanism is squeezed. incoming water supply is turned on.
Kink in water inlet hose. Remove kink.
Low or fluctuating pressure. Kink in high pressure discharge hose. Replace kinked high pressure hose.
Water inlet screen obstructed. Remove screen, clean or replace.
Pump sucking air. (Prime eliminated) Tighten all water intake connections
Eliminate leaks in intake line.
Adjustable grip on dual lance is Turn grip counterclockwise to
not in high pressure mode. move to high pressure.
Obstructed or worn spray nozzle. Remove, clean or replace.
Damaged or obstructed valve assy. Remove, inspect, clean or replace.
on pump.
Pump packings worn. Replace packings.
Unloader/bypass valve not operating Repair or replace.
correctly.
Water is leaking from Heat DumpValve. Water temperature is too high. Do not allow unit to operate in
bypass mode (with the trigger gun
closed) for more than three minutes.
Defective valve. Replace.
Pump oil appears milky or foamy. Water in oil. Change pump oil. Fill to proper
level.
Oil leaking from unit. Worn seals or o-rings. Contact Service Department.
Detergent will not siphon. Detergent strainer is not completely Check, submerge if necessary.
submerged in detergent solution.
Detergent strainer obstructed. Inspect, clean or replace.
Detergent hose cut, obstructed or Inspect, clean or replace.
kinked.
Detergent adjusting knob turned to Open adjusting knob. Refer to
closed position. "Cleaning with Detergents" pg. 15.
Adjustable grip on dual lance is Turn grip clockwise to move to low
not in low pressure. pressure.
Nozzle assembly is plugged. Clean or replace.
Water flows back into detergent Ball & Spring in detergent strainer Remove, clean or replace.
container. is obstructed.
Water flows from the nozzle when the Trigger gun is malfunctioning. Repair or replace.
trigger gun is locked in the OFF
position.
Water is leaking under heat Coil drain plug is not installed. Install.
exchanger coil.
Safety relief device is relieving 1. Detect and correct unloader or
caused by an unloader or pressure pressure switch problem.
switch malfunction. 2. Replace safety relief device.
NEVER run unit without safety
relief device. Doing so can
cause an explosion!

HSD-SERIES Operator's Manual 19
Burner will not ignite Burner switch is not turned on. Check switch position.
Out of fuel. Refuel.
Trigger gun is closed. Open gun for pressure.
EMF Drive-Belt loose or broken. Adjust or replace as necessary.
Flexible coupler broken. Replace.
Dirty or clogged fuel filter/water Drain or replace as necessary.
separator.
Fuel pump sucking air. Tighten all fuel intake connections.
Eliminate leaks in intake line.
Fuel pump inoperative. Check pressure, replace if
necessary
Fuel pickup screen obstructed. Consult Service Department
Dirty or clogged fuel nozzle. Replace fuel nozzle.
Ignition module. Consult Service Department.
Ignition electrodes damaged or worn. With unit running and trigger gun
closed, look through burner sight
glass to ensure there is sparking
across electrodes.
No voltage. Consult Service Department.
Pressure switch override. Pressure should be over 250 PSI/
18 Bar to allow burner to come on.
High limit switch override. Allow unit to cool down before
reigniting.
Improper burner air adjustment. Adjust as shown on pg. 16.
Fuel solenoid valve failure. Replace.
Burner runs erratically. Water in the fuel oil. Drain fuel filter/water separator,
drain fuel tank and replace with
clean fuel.
Dirty fuel filter/water separator. Replace element.
Dirty fuel nozzle. Replace.
Fuel pickup screen obstructed. Consult Service Department
Improper air adjustment setting. Adjust as shown on pg. 16.
Fuel pump malfunctioning. Replace.
Burner runs, but will not heat. Poor or improper fuel supply. Check fuel to ensure it is correct.
Drain tank and filter if necessary
and refill with proper fuel.
Low fuel pump pressure. Check fuel pump pressure, adjust or
replace if needed.
Dirty fuel nozzle. Replace.
Fuel pickup screen obstructed. Consult Service Department
Improper air adjustment setting. Adjust as shown on pg. 16.
Scale build up in heat exchanger coil. Consult Service Department.
Burner discharges white smoke. Low on fuel. Refuel. If white smoke persists,
consult Service Department.
Excessive air supply. Adjust as shown on pg. 16.
Burner discharges black smoke. Insufficient air supply. Adjust as shown on pg. 16.
TROUBLESHOOTING
SYMPTOM PROBABLE CAUSE REMEDY

20 HSD-SERIES Operator's Manual
MAINTENANCE CHART
PROCEDURE DAILY 3 MONTHS 6 MONTHS 9 MONTHS 12 MONTHS
Check engine oil level X
Change engine oil***** X X X X
Check water pump oil level X
Change water pump oil ** X X X X
Oil leak inspection X
Fuel leak inspection X
Water leak inspection X
Hose inspection X
Check fuel filter/water separator X
Inspect belts X X X X
Replace high pressure nozzle*** X X X X
Replace fuel filter/water separator X
Inspect fuel pump filter* X
Replace fuel nozzle* X
Check burner air adjustment X X X X
Check burner electrodes* X
Test water pressure* X X X X
Test fuel pressure* X X X X
Test water temperature* X X X X
Descale coil****
* Must be performed by an authorized service technician.
** The pump oil must be changed after the first 50 hours of operation and every 250 hours or 3 months,
whichever comes first.
*** High pressure nozzle should be replaced whenever pressure is less than 85%.
**** Scale buildup will vary with mineral content in the water and amount of usage. Descaling can range from
monthly to yearly maintenance.
***** The engine oil must be changed after the first 8 hours of operation and every 50 hours or 3 months,
whichever comes first.