Owner’s Manual MRT190HA
WARNING
USE EXTREME CAUTION WHILE USING THIS EQUIPMENT. INJURY CAN OCCUR. READ
CAREFULLY AND UNDERSTAND ALL ASSEMBLY AND SAFE OPERATION INSTRUCTIONS BEFORE OPERATING. FAILURE TO FOLLOW THE SAFETY RULES AND OTHER BASIC SAFETY
PRECAUTIONS MAY RESULT IN SERIOUS PERSONAL INJURY.
Maxim 800-621-2789 RT190H Rev. A Pg.
SAFETY RULES
Safe Operation Practices for Walk-Behind Tillers
TRAINING
• Read the Manual carefully. Be thoroughly familiar
with the controls and the proper use of the equipment.
Know how to stop the unit and disengage the controls
quickly
• Never allow children to operate the equipment. Never
allow adults to operate the equipment without proper
instruction.
• Keep the area of operation clear of all persons, partic-
ularly small children, and pets.
PREPARATION
• Thoroughly inspect the area where the equipment is
to be used and remove all foreign objects.
• Disengage all controls before starting the engine
(motor).
• Do not operate the equipment without wearing adequate outer garments. Wear footwear that will improve footing on slippery surfaces.
• Handle fuel with care; it is highly flammable.
• Never add fuel to a running engine or hot engine.
• Fill fuel tank outdoors with extreme care. Never fill
fuel tank indoors.
• Replace gasoline cap securely and clean up spilled
fuel before restarting.
• Never attempt to make any adjustments while the engine (motor) is running (except where specifically recommended by manufacturer).
OPERATION
• Do not put hands or feet near or under rotating parts.
• Exercise extreme caution when operating on or cross-
ing gravel drives, walks, or roads. Stay alert for hidden hazards or traffic. Do not carry passengers.
• After striking a foreign object, stop the engine (motor),
remove the wire from the spark plug, thoroughly in-
spect the tiller for any damage, and repair the damage
before restarting and operating the tiller.
• Exercise caution to avoid slipping or falling.
• If the unit should start to vibrate abnormally, stop the
engine (motor) and check immediately for the cause.
Vibration is generally a warning of trouble.
• Stop the engine (motor) when leaving the operating
position.
• Take all possible precautions when leaving the machine unattended. Disengage the tines, and stop the
engine.
• Before cleaning, repairing, or inspecting, shut off the
engine and make certain all moving parts have
stopped. Disconnect the spark plug wire, and keep
the wire away from the plug to prevent accidental
starting.
• Do not run the engine indoors; exhaust fumes are
dangerous.
! !
• Never operate the tiller without proper guards, plates,
or other safety protective devices in place.
• Keep children and pets away.
• Do not overload the machine capacity by attempting
to till too deep at too fast a rate.
• Never operate the machine at high speeds on slippery
surfaces. Look behind and use care when backing.
• Never allow bystanders near the unit.
• Use only attachments and accessories approved by
the manufacturer of the tiller.
• Never operate the tiller without good visibility or light.
• Be careful when tilling in hard ground. The tines may
catch in the ground and propel the tiller forward. If
this occurs, let go of the handlebars and do not restrain the machine.
MAINTENANCE AND STORAGE
• Keep machine in safe working condition.
• Check shear pins, engine mounting bolts, and other
bolts at frequent intervals for proper tightness to be
sure the equipment is in safe working condition.
• Never store the machine with fuel in the fuel tank in-
side a building where ignition sources are present,
such as hot water and space heaters, clothes dryers,
and the like. Allow the engine to cool before storing in
any enclosure.
• Always refer to the operator’s guide instructions for
important details if the tiller is to be stored for an extended period.
- IMPORTANT -
CAUTIONS, IMPORTANTS, AND NOTES ARE A MEANS
OF ATTRACTING ATTENTION TO IMPORTANT OR
CRITICAL INFORMATION IN THIS MANUAL.
IMPORTANT: USED TO ALERT YOU THAT THERE IS
A POSSIBILITY OF DAMAGING THIS EQUIPMENT.
NOTE: Gives essential information that will aid you to
better understand, incorporate, or execute a particular set
of instruction.
Look for this symbol to point out important
safety precautions. It means CAUTION!! BE-
!
!
The engine exhaust from this product contains chemicals knows to the State of California to cause cancer, birth defects, or other reproductive harm.
COME ALERT!! YOUR SAFETY IS INVOLVED.
CAUTION: Always disconnect spark plug
wire and place wire where it cannot contact
spark plug in order to prevent accidental
starting when setting up, transporting, adjusting or making repairs.
WARNING
! !
Maxim 800-621-2789 RT190H Rev. A Pg. 2
PRODUCT SPECIFICATIONS
Gasoline Capacity:
Oil (API-SG-SL):
(Capacity: 20 oz/0.6L)
Spark Plug:
(Gap: .030”/0.76mm)
4 Quarts (2.8L)
Unleaded Regular
SAE 30 (Above 40 F/4 C
SAE 5W-30 (Below 40 F/4 C)
Champion
RC12YC
CONGRATULATIONS on your purchase of a new tiller.
It has been designed, engineered and manufactured to
give you the best possible dependability and performance.
Should you experience any problems you cannot easily
remedy, please contact your nearest authorized service
center. We have competent, well-trained technicians
and the proper tools to service or repair this unit.
Please read and retain this manual. The instructions
will enable you to assemble and maintain your tiller
properly. Always observe the “SAFETY RULES”.
CUSTOMER RESPONSIBILITIES
• Read and observe the safety rules.
• Follow a regular schedule in maintaining, caring for
and using your tiller.
• Follow instructions under “Maintenance” and
“Storage” sections of this Owner’s Manual.
WARNING: This unit is equipped with an internal combustion engine and should not be used on or near any
unimproved forest-covered, brush-covered or grass
covered land unless the engine’s exhaust system is
equipped with a spark arrester meeting applicable local
laws (if any). If a spark arrester is used, it should be
maintained in effective working order by the operator.
In the state of California, a spark arrester is required by
law (Section 4442 of the California Public Resources
Code). Other states may have similar laws. Federal
laws apply on federal lands. See your authorized service center/DEPARTMENT for spark arrester.
TABLE OF CONTENTS
SAFETY RULES . . . . . . . . . . . . . . . . . . . . . . . . . 2
CUSTOMER RESPONSIBILITIES . . . . . . . . . . . 3
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
MAINTENANCE SCHEDULE . . . . . . . . . . . . . . . 8
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . 9-10
SERVICE & ADJUSTMENTS. . . . . . . . . . . . . . . 11-13
STORAGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
TROUBLESHOOTING . . . . . . . . . . . . .. . . . . . . 15
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Maxim 800-621-2789 RT190H Rev. A Pg. 3
OPERATION
KNOW YOUR TILLER
READ THIS OWNER’S MANUAL AND SAFETY RULES BEFORE OPERATING YOUR TILLER.
Compare the illustrations with your tiller to familiarize yourself with the location of various controls and adjustments.
Save this manual for future reference.
These symbols may appear on your Tiller or in literature supplied with the product. Learn and understand their
meaning.
Operator Present Safety
Twist Forward
& Reverse
Gas Cap
Choke
Recoil
Starter
Handle
Tine
Engagement
Hydro Oil Cap
Throttle
Hydro Oil Filter
On/Off Switch
FIG. 8
CHOKE CONTROL - Used when starting a cold engine.
DEPTH BAR - Controls depth at which tiller will dig.
TILLER CONTROL ROD - Used to engage tines.
TINE FLAP - Levels tilled soil
Maxim 800-621-2789 RT190H Rev. A Pg. 4
RECOIL STARTER HANDLE - Used to start the engine.
Variable speed with the twist of your wrist, forward and
reverse.
OPERATION
WEAR YOUR SAFETY
GLASSES
FORESIGHT IS BETTER
THAN NO SIGHT
HOW TO USE YOUR TILLER
Know how to operate all controls before adding fuel and
oil or attempting to start engine.
STOPPING (See Fig. 9)
TINES AND DRIVE
• Turn handlebar back to center position for neutral.
• Move tine control rod to your left and bring to center
ENGINE
• Never use choke to stop engine.
• Turn engine switch (OFF).
The operation of any tiller can result in foreign objects thrown into the eyes, which can result in severe eye
damage. Always wear safety glasses or eye shields before starting your tiller and while tilling. We recommend a wide vision safety mask for over spectacles or standard safety glasses.
position to stop movement on tines.
TILLING (See Fig. 12)
• Loosen depth bar tightener, pull the depth bar up for
increased tilling depth. Move drag stake to desired
position and retighten tightener handle to lock into
position.
• Place tine control rod in desired position. Slowly low-
er tines into the ground. Twist handle bar forward to
desired speed.
• Move throttle control to “FAST” position for deep tilling. To cultivate, throttle control can be set at any
desired speed, depending on how fast or slow you
wish to cultivate.
IMPORTANT: ALWAYS DISENGAGE TINE CONTROL
ROD WHEN NOT TILLING.
Self Centering,
release grip for
neutral
In Reverse
Position
Tine Control In
Neutral Position
TINE OPERATION
In Forward
Position
FIG. 9
• Tine movement is achieved by pulling tine control rod
back for counter rotating till position or push forward
for forward rotation tilling.
FORWARD -WHEELS ONLY
• Release tine rod, twist handle bar forward.
REVERSE -WHEELS ONLY
• DO NOT STAND DIRECTLY BEHIND TILLER.
• Move the tine control rod to the left and bring to center
position.
• Move throttle control to “SLOW” position.
• Twist handle bar backwards.
DEPTH BAR STAKE (See Fig. 12)
• Can be raised or lowered to allow you more versatile
tilling and cultivating, or to more easily transport your
tiller.
Depth
Bar
Depth Bar
Release
Tine Flap
TURNING
• Disengage the tine control rod.
• Move throttle control to “SLOW” position.
• Lift handle to raise tines out of ground.
• Swing the handle in the opposite direction you wish to
turn, being careful to keep feet and legs away from
tines. Slowly twist handlebar to desired direction.
• When you have completed your turn-around, with
handle up and tines out of ground, again engage tines
in desired direction. Slowly lower handle to start tilling. Slowly twist handlebar forward to desired speed.
FIG. 12
CULTIVATING
• Use the forward rotating tine drive when cultivating,
tilling soft ground or tilling pre-tilled soil.
• Loosen depth bar tightener and move depth bar to de-
sired height. Tighten tightener to lock. Lower drag stake.
• Move tine control rod in forward rotating till position.
• Move throttle control “FAST” position for deep tilling.
To cultivate, throttle control can be set at any desired
speed, depending on how fast or slow you wish to
cultivate.
• Always lower the depth bar when using the forward rotating tine drive.
Maxim 800-621-2789 RT190H Rev. A Pg. 5
OPERATION
TO TRANSPORT
CAUTION: Before lifting or transporting,
!
AROUND THE YARD
• Move the tine control rod to center position (neutral).
• Loosen depth bar tightener and move depth bar
• Slowly twist handlebar to desired direction and speed.
• Move throttle control to desired speed.
AROUND TOWN
• Disconnect spark plug wire.
• Drain fuel tank.
• Transport in upright position to prevent oil leakage.
allow tiller engine and muffler to cool. Disconnect spark plug wire. Drain gasoline
from fuel tank.
down. This will keep tine from damaging the yard or
from getting damaged.
BEFORE STARTING ENGINE
IMPORTANT: BE VERY CAREFUL NOT TO ALLOW DIRT TO
ENTER THE ENGINE WHEN CHECKING OR ADDING OIL OR
FUEL. USE CLEAN OIL AND FUEL AND STORE IN APPROVED, CLEAN, COVERED CONTAINERS. USE CLEAN
FILL FUNNELS.
CHECK ENGINE OIL LEVEL (See Fig. 13)
• The engine in your unit has been shipped, from the
factory, already filled with SAE 30 summer weight oil.
• With engine level, clean area around oil filler plug and
remove plug.
• Engine oil should be to point of overflowing when engine is level. For approximate capacity see
“PRODUCT SPECIFICATIONS” on page 2 of this
manual. All oil must meet A.P.I. Service Classification
SG-SL.
• Reinstall engine oil cap and tighten.
• For cold weather operation you should change oil for
easier starting (See oil viscosity chart in the Maintenance section of this manual).
• To change engine oil, see the Maintenance section in
this manual.
ADD GASOLINE
• Fill fuel tank to bottom of filler neck. Do not overfill.
Use fresh, clean, regular unleaded gasoline with a
minimum of 87 octane. (Use of leaded gasoline will
increase carbon and lead oxide deposits and reduce
valve life). Do not mix oil with gasoline. Purchase
fuel in quantities that can be used within 30 days to
assure fuel freshness.
CAUTION: Fill to within 1/2 inch of top of
fuel tank to prevent spills and to allow for
!
IMPORTANT: WHEN OPERATING IN TEMPERATURES BELOW 32 F (0 C), USE FRESH, CLEAN WINTER GRADE
GASOLINE TO HELP INSURE GOOD COLD WEATHER
STARTING.
fuel expansion. If gasoline is accidentally
spilled, move machine away from area of
spill. Avoid creating any source of ignition until gasoline vapors have disappeared.
Wipe off any spilled oil or fuel. Do not
store, spill or use gasoline near an open
flame.
CAUTION: Alcohol blended fuels (called gasohol
or using ethanol or methanol) can attract moisture
which leads to separation and formation of acids
during storage. Acidic gas can damage the fuel system of an engine while in storage. To avoid engine
problems, the fuel system should be emptied before
storage of 30 days or longer. Drain the gas tank,
start the engine and let it run until the fuel lines and
carburetor are empty. Use fresh fuel next season.
See Storage Instructions for additional information.
Never use engine or carburetor cleaner products in
the fuel tank or permanent damage may occur.
TO START ENGINE (See Fig. 14)
CAUTION: Keep tine control rod in
!
“DISENGAGED” position when starting
engine.
When starting engine for the first time or if engine has run
out of fuel, it will take extra pulls of the recoil starter to
move fuel from the tank to the engine.
• Make sure spark plug wire is properly connected.
• Place throttle control in “FAST” position.
• Turn fuel shut-off valve 1/4 turn to open position.
• Move choke control to choke position.
• Grasp recoil starter handle with one hand and place
foot on bottom part of front bumper. Pull rope out
slowly until engine reaches start of compression cycle
FIG. 13
Maxim 800-621-2789 RT190H Rev. A Pg. 6
(rope will pull slightly harder at this point).
• Pull recoil starter handle quickly. Do not let starter
handle snap back against starter.
OPERATION
• If engine fires but does not start, move choke control
to half choke position. Pull recoil starter handle until
engine starts.
• When engine starts, slowly move choke control to
“RUN” position as engine warms up.
NOTE: A warm engine requires less choking to start.
• Move throttle control to desired running position.
• Allow engine to warm up for a few minutes before en-
gaging tines.
NOTE: If at a high altitude (3000 feet) or in cold tempera-
tures (below 32 F), the carburetor fuel mixture may need to
be adjusted for best engine performance. See “TO ADJUST
CARBURETOR” in the Service and Adjustments section of
this manual.
NOTE: If engine does not start, see troubleshooting
points.
tilling; however, extremely wet soil will “ball-up” or
clump during tilling. Wait until the soil is less wet in
order to achieve the best results. When tilling in the
fall, remove vines and long grass to prevent them from
wrapping around the tine shaft and slowing your tilling
operation.
• Do not lean on handle. This takes weight off the
wheels and reduces traction. To get through a really
tough section of sod or hard ground, apply downward
pressure on handle or raise the depth bar.
TILLING HINTS (See Fig. 15)
FIG. 14
CAUTION: Until you are accustomed to
!
• Tilling is digging into, turning over, and breaking up
• You will find tilling much easier if you leave a row un-
• Soil conditions are important for proper tilling. Tines
handling your tiller, start actual field use
with throttle in slow position (mid-way between “FAST” and “IDLE”).
packed soil before planting. Loose, unpacked soil
helps root growth. Best tilling depth is 4” to 6” (10-15
cm). A tiller will also clear the soil of unwanted vegetation. The decomposition of this vegetable matter
enriches the soil. Depending on the climate (rainfall
and wind), it may be advisable to till the soil at the end
of the growing season to further condition the soil.
tilled between passes. Then go back between tilled
rows. (See Fig. 15) There are two reasons for doing
this. First, wide turns are much easier to negotiate
than about-faces. Second, the tiller won’t be pulling
itself, and you, toward the row next to it.
will not readily penetrate dry, hard soil which may contribute to excessive bounce and difficult handling of
your tiller. Hard soil should be moistened before
CULTIVATING
Cultivating is destroying the weeds between rows to prevent them from robbing nourishment and moisture from
the plants. At the same time, breaking up the upper layer
of soil crust will help retain moisture in the soil. Best digging depth is 1” to 3” (2.5 - 7.5 cm).
• Cultivate up and down the rows at a speed which will
allow tines to uproot weeds and leave the ground in
rough condition, promoting no further growth of weeds
and grass (See Fig. 16).
• Do not lean on handle, this takes weight off the
wheels, reduces traction, and may cause the tiller to
skip over the ground.
• Always lower the depth bar when using the forward rotating tine drive.
Maxim 800-621-2789 RT190H Rev. A Pg. 7
MAINTENANCE
SCHEDULE
FILL IN DATES
AS YOU COMPLETE
REGULAR SERVICE
Check Engine Oil Level X X
Change Engine Oil X1,2
Check Hydro Oil Level X
Inspect Spark Arrester/Muffler X
Inspect Air Screen X
Clean or Replace Air Cleaner Cartridge X2
MAINTENANCE
SERVICE DATES
Clean Engine Cylinder Fins X
Replace Spark Plug X
Change Hydro Oil X
Check Tine Chain Tension X
Check Tine Chain Oil X
Change Tine Chain Oil X
Change Hydro Oil Filter X
1 - Change more often when operating under a heavy load or in high ambient temperatures.
2 - Service more often when operating in dirty or dusty condition.
GENERAL RECOMMENATIONS
The warranty on this tiller does not cover items that have
been subjected to operator abuse or negligence. To receive full value from the warranty, the operator must maintain tiller as instructed in this manual.
Some adjustments will need to be made periodically to
properly maintain your tiller.
All adjustments in the Service and Adjustments section of
this manual should be checked at least once each sea-
son.
BEFORE EACH USE
• Check engine oil level.
• Check tine operation.
• Check for loose fasteners.
• Once a year you should replace the spark plug, clean
or replace air filter, and check tines for wear. A new
spark plug and clean air filter assure proper air-fuel
mixture and help your engine run better and last longer.
Maxim 800-621-2789 RT190H Rev. A Pg. 8
!
MAINTENANCE
Disconnect spark plug wire before performing any maintenance (except carburetor adjustment)
to prevent accidental starting of engine.
Prevent fires! Keep the engine free of grass, leaves, spilled oil, or fuel. Remove fuel from tank
before tipping unit for maintenance. Clean muffler area of all grass, dirt, and debris.
Do not touch hot muffler or cylinder fins as contact may cause burns.
ENGINE
LUBRICATION
Use only high quality detergent oil rated with API service
classification SG-SL. Select the oil’s SAE viscosity grade
according to your expected temperature.
NOTE: Although multi-viscosity oils (5W-30, 10W-30,
etc.) improve starting in cold weather, these multi-viscosity
oils will result in increased oil consumption when used
above 40 F (4 C). Check your engine oil level more frequently to avoid possible engine damage from running
low on oil.
Change the oil after every 25 hours of operation or at least
once a year if the tiller is not used for 25 hours in one year.
Check the crankcase oil level before starting the engine
and after each five (5) hours of continuous use. Add SAE
30 motor oil or equivalent. Tighten oil filler plug securely
each time you check the oil level.
TO CHANGE ENGINE OIL (See Figs. 19 and 20)
• Be sure tiller is on level surface.
• Oil will drain more freely when warm.
• Use a funnel to prevent oil spill on tiller, and catch oil
in a suitable container.
• Remove drain plug.
• For easier removal of plug use 7/16 12 Pt. socket with
extension.
• After oil has drained completely, replace oil drain plug
and tighten securely.
• Remove oil filler plug. Be careful not to allow dirt to
enter the engine.
• Refill engine with oil. See “CHECK ENGINE OIL LEVEL” in the Operation section of this manual.
AIR FILTER (See Fig. 21)
Your engine will not run properly using a dirty air filter.
Clean the foam pre-cleaner after every 25 hours of operation or every season. Service paper cartridge every 100
hours of operation or every season, whichever occurs first.
Service air cleaner more often under dusty conditions.
• Remove cover screw and cover
TO SERVICE PRE-CLEANER
• Remove foam pre-cleaner from air cleaner cover.
• Wash it in liquid detergent and water.
• Squeeze it dry in a clean cloth.
• If very dirty or damaged, replace pre-cleaner.
• Reinstall pre-cleaner into air cleaner cover.
• Reinstall cover and secure screw.
TO SERVICE CARTRIDGE
• Carefully remove cartridge to prevent debris from entering carburetor. Clean base carefully to prevent debris from entering carburetor.
• Clean cartridge by tapping gently on flat surface. If
very dirty or damaged, replace cartridge.
• Reinstall cartridge, cover with pre-cleaner and secure
with screw.
IMPORTANT: PETROLEUM SOLVENTS, SUCH AS KEROSENE, ARE NOT TO BE USED TO CLEAN THE CARTRIDGE.
THEY MAY CAUSE DETERIORATION OF THE CARTRIDGE.
DO NOT OIL CARTRIDGE. DO NOT USE PRESSURIZED AIR
TO CLEAN OR DRY CARTRIDGE.
FIG. 20
Oil Drain
Oil Fill
Maxim 800-621-2789 RT190H Rev. A Pg. 9
Oil Level
MAINTENANCE
COOLING SYSTEM (See Fig. 22)
Your engine is air cooled. For proper engine performance and long life, keep your engine clean.
• Clean air screen frequently using a stiff-bristled
brush.
• Remove blower housing and clean as necessary.
• Keep cylinder fins free of dirt and chaff.
MUFFLER
Do not operate tiller without muffler. Do not tamper with
exhaust system. Damaged mufflers or spark arresters
could create a fire hazard. Inspect periodically and replace if necessary. If your engine is equipped with a
spark arrester screen assembly, remove every 50 hours
for cleaning and inspection. Replace if damaged.
SPARK PLUG
Replace spark plugs at the beginning of each tilling
season or after every 50 hours of use, whichever
comes first. Spark plug type and gap setting is shown
in “PRODUCT SPECIFICATIONS” on page 3 of this
manual.
CLEANING
Do not clean your tiller when the engine, pump, and
motors are hot. We do not recommend using pressur-
ized water (garden hose, etc.) to clean your unit unless
the gasket area around the pump and the engine muffler, air filter and carburetor are covered to keep water
out. Water in engine will shorten the useful life of your
tiller.
• Clean engine, wheels, finish, etc., of all foreign mat-
ter.
• Keep finished surfaces and wheels free of all gaso-
line, oil, etc.
• Protect painted surfaces with automotive type wax.
Maxim 800-621-2789 RT190H Rev. A Pg. 10
SERVICE AND ADJUSTMENTS
!
CAUTION: Disconnect spark plug wire from spark plug and place wire where it cannot come
into contact with plug.
TILLER
TO ADJUST HANDLE HEIGHT (See Fig. 23)
Select handle height best suited for your tilling conditions. Handle height will be different when tiller digs
into soil.
• Handle height is changed by different setting on
rear tiller assembly.
• Lower holes on main frame will raise handle height.
• Unbolt rear tiller assembly (4-bolts) and move to
desired setting.
• Make sure all bolts are tight before operating.
Handle
(Lowest Position)
Handle
(High Position)
Wheel
Nut
Cotter
Pin
FIG. 24
FIG. 23
TIRE CARE
CAUTION: When mounting tires, unless
!
• Maintain 39 pounds of tire pressure. If tire pres-
• Keep tires free of gasoline or oil which can damage
TO REMOVE WHEEL (See Fig. 24)
• Place blocks under wheel motor to keep tiller from
• Remove cotter pin and wheel nut.
• Remove wheel and tire.
• Repair tire and reassemble.
beads are seated, over-inflation can
cause an explosion.
sures are not equal, tiller will pull to one side.
rubber.
tipping.
Maxim 800-621-2789 RT190H Rev. A Pg. 11
SERVICE AND ADJUSTMENTS
TINE REPLACEMENT
(See Figs. 27, 28 and 29)
CAUTION: Tines are sharp. Wear
gloves or other protection when han-
!
A badly worn tine causes your tiller to work harder and
dig more shallow. Most important, worn tines cannot
chop and shred organic matter as effectively nor bury it
as deeply as good tines. A tine this worn needs to be
replaced.
• To maintain the superb tilling performance of this
dling tines.
machine, the tines should be checked for sharpness, wear, and bending, particularly the tines
which are next to the transmission. If the gap between the tines exceeds 3 1/2 inches, they should
be replaced or straightened as necessary.
• For tines that are slightly worn, the bolted tine and
hub assemblies can be switched between sides to
continue tilling in the same tilling mode if tilling in a
different mode is desired then the bolted tine and
hub assemblies should be switched back to their
original side so that the tine edge with the least
wear will be used.
New
Tine
FIG. 27
Worn
Tine
Shear
Bolt
3 1/2”
Max
FIG. 29
Maxim 800-621-2789 RT190H Rev. A Pg. 12
SERVICE AND ADJUSTMENTS
ENGINE
TO ADJUST THROTTLE CONTROL CABLE
(See Fig. 30)
The throttle control has been preset at the factory and
adjustment should not be necessary. If adjustment is
necessary, proceed as follows:
• With engine not running, move remote throttle con-
trol lever to “FAST” position.
• If throttle lever on engine touches high speed stop,
no further adjustment is necessary. If throttle lever
does not touch high speed stop, continue with adjustment procedure.
• Loosen cable clamp screw.
• Move throttle lever up until it touches high speed
stop, and hold in this position.
• Tighten cable clamp screw securely.
TO ADJUST CARBURETOR
The carburetor has been preset at the factory and adjustment should not be necessary. However, engine
performance can be affected by differences in fuel, temperature, altitude or load. If the carburetor does need
adjustment, contact your nearest authorized service
center/department.
IMPORTANT: NEVER TAMPER WITH THE ENGINE GOVERNOR, WHICH IS FACTORY SET FOR PROPER ENGINE
SPEED. OVERSPEEDING THE ENGINE ABOVE THE FACTORY HIGH SPEED SETTING CAN BE DANGEROUS. IF YOU
THINK THE ENGINE GOVERNED HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR NEAREST AUTHORIZED SERVICE CENTER/DEPARTMENT, WHICH HAS THE PROPER
EQUIPMENT AND EXPERIENCE TO MAKE ANY NECESSARY
ADJUSTMENTS.
FIG. 30
Maxim 800-621-2789 RT190H Rev. A Pg. 13
STORAGE
Immediately prepare your tiller for storage at the end of
the season or if the unit will not be used for 30 days or
more.
CAUTION: Never store the tiller with
gasoline in the tank inside a building
!
where fumes may reach an open flame
or spark. Allow the engine to cool before storing in any enclosure.
TILLER
• Clean entire tiller (See “CLEANING” in the Mainte-
nance section of this manual).
• Be sure that all nuts, bolts and screws are securely
fastened. Inspect moving parts for damage, breakage and wear. Replace if necessary.
• Touch up all rusted or chipped paint surfaces; sand
lightly before painting.
ENGINE
FUEL SYSTEM
IMPORTANT: IT IS IMPORTANT TO PREVENT GUM DEPOS-
ITS FROM FORMING IN ESSENTIAL FUEL SYSTEM PARTS
SUCH AS THE CARBURETOR, FUEL FILTER, FUEL HOSE,
OR TANK DURING STORAGE. ALSO, EXPERIENCE INDICATES THAT ALCOHOL BLENDED FUELS (CALLED GASOHOL OR USING ETHANOL OR METHANOL) CAN ATTRACT
MOISTURE WHICH LEADS TO SEPARATION AND FORMATION OF ACIDS DURING STORAGE. ACIDIC GAS CAN
DAMAGE THE FUEL SYSTEM OF AN ENGINE WHILE IN
STORAGE.
• Empty the fuel tank by starting the engine and let it
run until the fuel lines and carburetor are empty.
• Never use engine or carburetor cleaner products in
the fuel tank or permanent.
• Use fresh fuel next season.
NOTE: Fuel stabilizer is an acceptable alternative in
minimizing and formation of fuel gum deposits during
storage. Add stabilizer to gasoline in fuel tank or storage container. Always follow the mix ratio found on
stabilizer container. Run engine at least 10 minutes
after adding stabilizer to allow the stabilizer to reach the
carburetor. Do not empty the gas tank and carburetor if
using fuel stabilizer.
ENGINE OIL
Drain oil (with engine warm) and replace with clean oil.
(See “ENGINE” in the Maintenance section of this manual).
CYLINDERS
• Remove spark plug.
• Pour 1 ounce (29 ml) of oil through spark plug hole
into cylinder.
• Pull starter handle slowly several times to distribute
oil.
• Replace with new spark plug.
OTHER
• Do not store gasoline from one season to another.
• Replace your gasoline can if your can starts to rust.
Rust and/or dirt in your gasoline will cause problems.
• If possible, store your unit indoors and cover it to
give protection from dust and dirt.
• Cover your unit with a suitable protective cover that
does not retain moisture. Do not use plastic. Plas-
tic cannot breathe which allows condensation to
form and will cause your unit to rust.
IMPORTANT: NEVER COVER TILLER WHILE ENGINE AND
EXHAUST AREAS ARE STILL WARM.
Maxim 800-621-2789 RT190H Rev. A Pg. 14
PROBLEM
Will not start
Hard to start
Loss of power
Engine overheats
Excessive bounce/
difficult handling
Soil balls up or clumps
Engine runs but tiller
won’t move
Engine runs but labors
when tilling
Tines will not rotate
Tines skip over ground
TROUBLESHOOTING POINTS
CAUSE
1. Out of fuel.
2. Engine not “CHOKED” properly.
3. Engine flooded.
4. Dirty air cleaner.
5. Water in fuel.
6. Clogged fuel tank.
7. Loose spark plug wire.
8. Bad spark plug or improper gap.
9. Carburetor out of adjustment.
10. Tine control rod engaged.
11. Wheel drive is engaged.
1. Throttle control not set properly.
2. Dirty air cleaner.
3. Bad spark plug or improper gap.
4. Stale or dirty fuel.
5. Loose spark plug wire.
6. Carburetor out of adjustment.
1. Engine is overloaded.
2. Dirty air cleaner.
3. Low oil level/dirty oil.
4. Faulty spark plug.
5. Oil in fuel.
6. Stale or dirty fuel.
7. Water in fuel.
8. Clogged fuel tank.
9. Spark plug wire loose.
10. Dirty engine air screen.
11. Dirty/clogged muffler.
12. Carburetor out of adjustment.
13. Poor compression.
14. Clogged oil filter.
1. Low oil level/dirty oil.
2. Dirty engine air screen
3. Dirty engine.
4. Partially plugged muffler.
5. Improper carburetor adjustment.
1. Ground too dry and hard.
1. Ground too wet.
1. Hydro oil level too low.
2. Clogged oil filter.
3. Love-joy couple disconnected.
4. Control rod disconnected.
5. Pumps/motors not primed.
1. Tilling too deep.
2. Throttle control not properly adjusted.
3. Carburetor out of adjustment.
1. Shear pin(s) broken.
2. Chain/sprocket broken.
1. Depth bar not lowered in forward rotating till mode.
2. Improper tilling mode.
CORRECTION
1. Fill fuel tank.
2. See “TO START ENGINE” in Operation section.
3. Wait several minutes before attempting to start.
4. Clean or replace air cleaner cartridge.
5. Empty fuel tank and carburetor, and refill tank
with fresh gasoline.
6. Remove fuel tank and clean.
7. Make sure spark plug wire is sealed properly on
plug.
8. Replace spark plug or adjust gap.
9. Make necessary adjustments.
10. Disengage.
11. Return handle bar to neutral.
1. Place throttle control in “FAST” position.
2. Clean or replace air cleaner cartridge.
3. Replace spark plug or adjust gap.
4. Empty fuel tank and refill tank with fresh, clean
gasoline.
5. Make sure spark plug wire is seated properly on
plug.
6. Make necessary adjustments.
1. Set depth stake for shallower tilling.
2. Clean or replace air cleaner cartridge.
3. Check oil level/change oil.
4. Clean and regap or change spark plug.
5. Empty and clean fuel tank and refill, and clean
carburetor.
6. Empty fuel tank and refill fuel tank with fresh
gasoline.
7. Empty fuel tank and carburetor, and refill tank
with fresh gasoline.
8. Remove fuel tank and clean.
9. Connect and tighten spark plug wire.
10. Clean engine air screen.
11. Clean/replace muffler.
12. Make necessary adjustments.
13. Contact an authorized service center department.
14. Replace oil filter.
1. Check oil level/change oil.
2. Clean engine air screen.
3. Clean cylinder fins, air screen, and muffler area.
4. Remove and clean muffler.
5. Adjust carburetor to richer position.
1. Moisten ground or wait for more favorable soil
conditions.
1. Wait for more favorable soil conditions.
1. Add hydro oil.
2. Replace oil filter.
3. Reconnect coupler.
4. Reconnect control rod.
5. Allow time for oil to circulate.
1. Set depth bar for shallower tilling.
2. Check throttle control setting.
3. Make necessary adjustments.
1. Replace shear pin(s).
2. Remove cover plate and check chain tension.
1. Lower depth bar.
2. Forward rotating tine drive should only be used for
soft ground or for soil that has already been tilled.
Maxim 800-621-2789 RT190H Rev. A Pg. 15
20195 South Diamond Lake Road, Suite 100 • Rogers, MN 55374
Toll-Free: 800-621-2789 • Website: maximmfg.com • Email: sales@maximmfg.com
Dear Valued Customer:
Consumer Warranty Period
Commercial Warranty Period
Weldments
1 year from date of purchase by user
1 year from date of purchase by user
Hydro-Gear
1 year from date of purchase by user
1 year from date of purchase by user
Wear Parts
Maxim shall warrant some normal wear items from defects in material or workmanship for a period of 30 days
from the date of purchase by user. Unless unused, warranty does not apply to normal wear and tear components
including, but not limited to, High impact wear related components such as tines and tine assemblies, seals, seal
shields, bearings, bushings, gaskets, tires, wheel assemblies and lubrication to include hydraulic oil
replacement, fuel contamination or from failure to follow instructions contained in the User Manual for
the equipment. Wear item warranties are subject to inspection, with warranty level of coverage or to
replace/repair is at the sole decision/discretion of Maxim. Routine maintenance items such as lubricants,
adjustments, tune ups, and/or damage from operation with loose hardware are not covered under limited
warranty.
Engines
The engine warranty is covered under the terms and conditions as outlined by the engine manufactures
warranty contained herein and is the sole responsibility of the engine manufacturer. Normal engine
maintenance such as spark plugs, oil changes, filters, adjustments, fuel system cleaning and obstruction due to
build up is not covered by this Maxim limited warranty.
The Maxim Product you just purchased is built with the finest material and craftsmanship. Use this product properly and enjoy the benefits
from its high performance. By purchasing a Maxim Product, you show a desire for quality and durability. Like all mechanical equipment this
unit requires a due amount of care. Treat this unit like the high quality piece of machinery it is. Neglect and improper handling may impair its
performance and is not covered by this limited warranty.
Thoroughly read the instructions and understand the operation before using your product. Always contact Maxim Product Support at
1-800-621-2789 prior to having any service or warranty work performed, as some services performed by parties other than Maxim approved
service centers may void this warranty. This limited warranty is in lieu of any other warranty expressed or implied, written or oral and Maxim
assumes no other responsibility or liability outside that expressed within this limited warranty.
Limited Warranty for Maxim Hydraulic Rear Tine Tiller:
RT190H
“Consumer use” means personal residential household use by a consumer. “Commercial use” means all other uses, including, but not limited
to, use for commercial, income producing or rental purposes or when purchased by a business.
This limited warranty applies to the original purchaser of the equipment (verification of purchase, in the form of a receipt, is the responsibility
of the buyer), is non-transferable, and covers parts and labor. Parts will be replaced or repaired at no charge, except when the equipment has
failed due to lack of proper maintenance. If a part is no longer available, the part may be replaced with a similar part of equal function. Any
misuse, abuse, alteration or improper installation or operations will void warranty. Determining whether a part is to be replaced or repaired is
the sole decision of Maxim. Maxim will not provide for replacement of complete products due to defective parts. Any costs incurred due to
replacement or repair of items outside of a Maxim approved facility is the responsibility of the buyer and not covered under warranty.
Transportation costs to and from service center and/or service calls are the responsibility of the customer.
This limited warranty specifically excludes the following; failure of parts due to damage caused by accident, fire, flood, windstorm, acts of God,
applications not approved by Maxim in writing, corrosion caused by chemicals, use of replacement parts which do not conform to manufacturer’s
specifications, damage related to rodent and/or insect infestation and damage caused by vandalism. Additional exclusions: loss of running time,
inconvenience, loss of income, or loss of use, including any implied warranty of merchantability of fitness for a specific use. Also, outdoor
power equipment needs periodic parts and service to perform well, and this limited warranty does not cover instances when normal use has
exhausted the life of a component or the engine.
This limited warranty does not cover any personal injury or damage to surrounding property caused by failure of any part, misuse or inability to
use the product. Alteration of the product, including safety features, shall void this limited warranty.
For products purchased on or after July 1, 2020
Great Northern Equipment Distribung, Inc.
20195 South Diamond Lake Road, Suite 100
Rogers, MN 55374
www.maximmfg.com
800-621-2789
Maxim 800-621-2789 RT190H Rev. A
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