IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY
Warning:
covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a spark arrester meeting
applicable local or state 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 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. A spark arrester for the muffler is available through your nearest engine authorized
service dealer or contact the service department, P.O. Box 368022 Cleveland, Ohio 44136-9722.
MTD PRODUCTS INC. P.O. BOX 368022 CLEVELAND, OHIO 44136-9722
PRINTED IN U.S.A.FORM NO. 770-0359A
This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-
SECTION 1: IMPORTANT SAFE OPERATION PRACTICES
WARNING:
THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS WHICH, IF
NOT FOLLOWED, COULD ENDANGER THE PERSONAL SAFETY AND/OR PROPERTY OF
YOURSELF AND OTHERS. READ AND FOLLOW ALL INSTRUCTIONS IN THIS MANUAL
BEFORE ATTEMPTING TO OPERATE YOUR SNOW THROWER. FAILURE TO COMPLY WITH
THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY. WHEN YOU SEE THIS
SYMBOL-HEED ITS WARNING.
:
WARNING
The Engine Exhaust from this product contains chemicals
known to the State of California to cause cancer, birth defects or other reproductive
harm.
DANGER:
operation in this manual. As with any type of power equipment, carelessness or error on the
part of the operator can result in serious injury. If you violate any of these rules, you may
cause serious injury to yourself or others.
Your snow thrower was built to be operated according to the rules for safe
1. TRAINING
• Read this operator's manual carefully in its entirety
before attempting to assemble or operate this
machine. Be completely familiar with the controls
and the proper use of this machine before
operating it. Keep this manual in a safe place for
future and regular reference and for ordering
replacement parts.
• Never allow children under 14 years old to operate
a snow thrower. Children 14 years old and over
should only operate snow thrower under close
parental supervision. Only persons well acquainted
with these rules of safe operation should be
allowed to use your snow thrower.
• No one should operate this unit while intoxicated
or while taking medication that impairs the senses
or reactions.
• Keep the area of operation clear of all persons,
especially small children and pets.
• Exercise caution to avoid slipping or falling,
especially when operating in reverse.
2. PREPARATION
• Thoroughly inspect the area where the equipment
is to be used and remove all door mats, sleds,
boards, wires and other foreign objects.
• Disengage all clutches and shift into neutral before
starting engine.
• Do not operate equipment without wearing
adequate winter outer garments. Do not wear
jewelry, long scarfs or other loose clothing which
could become entangled in moving parts. Wear
footwear which will improve footing on slippery
surfaces.
• Before working with gasoline, extinguish all
cigarettes and other sources of ignition. Check the
fuel before starting the engine. Gasoline is an
extremely flammable fuel. Do not fill the gasoline
tank indoors, while the engine is running, or until
engine has been allowed to cool at least two
minutes. Replace gasoline cap securely and wipe
off any spilled gasoline before starting the engine
as it may cause a fire or explosion.
• Use a grounded three wire plug-in for all units with
electric drive motors or electric starting motors.
• Adjust collector housing height to clear gravel or
crushed rock surface.
• Never attempt to make any adjustments while
engine is running (except where specifically
recommended by manufacturer).
• Let engine and machine adjust to outdoor
temperature before starting to clear snow.
• Always wear safety glasses or eye shields during
operation or while performing an adjustment or
repair, to protect eyes from foreign objects that
may be thrown from the machine in any direction.
3. OPERATION
• Do not put hands or feet near or under rotating
parts. Keep clear of discharge opening and auger
at all times.
• Exercise extreme caution when operating on or
crossing gravel drives, walks, or roads. Stay alert
for hidden hazards or traffic. Do not carry
passengers.
• After striking a foreign object, stop the engine,
remove wire from spark plug, and thoroughly
inspect the snow thrower for any damage. Repair
the damage before restarting and operating the
snow thrower.
2
• If the snow thrower should start to vibrate
abnormally, stop the engine and check
immediately for the cause. Vibration is generally a
warning of trouble.
• Stop engine whenever you leave the operating
position, before unclogging the collector/impeller
housing or discharge guide, and making any
repairs, adjustments, or inspections. Never place
your hand in the discharge or collector openings.
Use a stick or wooden broom handle to unclog the
discharge opening.
• Take all possible precautions when leaving the unit
unattended. Disengage the collector/impeller, shift
into neutral, stop the engine, and remove the key.
• When cleaning, repairing, or inspecting, make
certain collector/impeller and all moving parts have
stopped. Disconnect spark plug wire and keep
away from plug to prevent accidental starting.
• Do not run engine indoors, except when starting
engine and transporting snow thrower in or out of
building. Open doors. Exhaust fumes are
dangerous.
• Do not clear snow across the face of slopes.
Exercise extreme caution when changing direction
on slopes. Do not attempt to clear steep slopes.
• Never operate snow thrower without guards,
plates, or other safety protection devices in place.
• Never operate snow thrower near glass enclosure,
automobiles, window wells, drop off, etc., without
proper adjustments of snow thrower discharge
angle. Keep children and pets away.
• Do not overload machine capacity by attempting to
clear snow at too fast a rate.
• Never operate the machine at high transport
speeds on slippery surfaces. Look behind and use
care when backing.
• Never direct discharge at bystanders or allow
anyone in front of unit.
• Disengage power to collector/impeller when
transporting or not in use.
• Use only attachments and accessories approved
by the manufacturer of snow thrower (such as
wheel weights, counter weights, cabs, etc.).
• Never operate the snow thrower without good
visibility or light. Always be sure of your footing
and keep a firm hold on the handles. Walk, never
run.
• Muffler and engine become hot and can cause a
burn. Do not touch.
4. MAINTENANCE AND STORAGE
• Check shear bolts, engine mounting bolts, etc., at
frequent intervals for proper tightness to be sure
equipment is in safe working condition.
• Never store the machine with fuel in the fuel tank
inside a building where ignition sources are
present, such as hot water and space heaters,
clothes dryers, and the like. Allow engine to cool
before storing in any enclosure.
• Always refer to operator's manual instructions for
important details if snow thrower is to be stored for
an extended period.
• Run machine a few minutes after throwing snow to
prevent freeze up of collector/impeller.
• Check clutch controls periodically to verify they
engage and disengage properly and readjust if
necessary. Refer to operator's manual for
adjustment instructions.
WARNING - YOUR RESPONSIBILITY:
Restrict the use of this power machine to
persons who read, understand and follow the warnings and instructions in this manual and
on the machine.
DANGER
AV OID INJUR Y FROM
ROTATING AUGER KEEP HANDS, FEET
AND CLOTHING A WA Y .
W ARNING
STOP ENGINE BEFORE REMOVING
1.
DEBRIS AND SERVICING UNIT
KEEP CLEAR OF IMPELLER WHILE
2.
ENGINE IS RUNNING
3.
NEVER DIRECT DISCHARGE AT
BYSTANDERS OR WINDOWS OR
ALLOW ANYONE IN FRONT OF
UNIT
THOROUGHLY INSPECT THE AREA
4.
WHERE THE EQUIPMENT IS TO BE
USED AND REMOVE ALL DOOR
MATS, SLEDS, BOARDS, WIRES AND
OTHER FOREIGN OBJECTS
REFER TO OWNERS MANUAL FOR
5.
FULL INSTRUCTIONS
3396MW
Figure 1
3
SECTION 2: FINDING YOUR MODEL NUMBER
This Operator’s Manual is an important part of your new snow thrower. It will help you assemble, prepare
and maintain your snow thrower. Please read and understand what it says.
Before you start to prepare your snow thrower for its first use, please locate the model plate and copy the
information from it in this Operator’s Manual. The information on the model plate is very important if you need
help from your dealer or the MTD customer support department.
• Every snow thrower has a model plate. You can locate it by standing behind the unit in the operating
position and looking down at the rear frame below the engine.
• The model plate will look like Figure 2.
This is where your model number will be.
XXX-X-XXX-X-XXX XXXXXXXXXXX
This is where your serial number will be.
Copy the model number here:
MTD PRODUCTS INC
CLEVELAND, OHIO 44136
Copy the serial number here:
Figure 2
SECTION 3: CALLING CUSTOMER SUPPORT
If you are having difficulty assembling this product or if you have any question regarding the controls,
operation or maintenance of this snow thrower, please call the Customer Support Department. You can
reach them by calling:
1-800-800-7310
Before you call, make sure that you have both your model and serial number ready. By having the model and
serial number ready, you help the Customer Support Representative give you faster service. To find your
units model and serial number, see SECTION 2: FINDING YOUR MODEL NUMBER.
4
SECTION 4: CONTENTS OF HARDWARE PACK
Lay out the hardware according to the illustration for identification purposes. Parts are illustrated approximately
one-half size. Part numbers are shown in parentheses. (Hardware pack may contain extra items which are not
used on your unit.)
ATTACHING THE HANDLE ASSEMBLY
A
Hex Bolts
5/16-18 x 1-3/4" Long
(710-3180)
Hex Bolts
5/16-18 x 3/4" Long
(710-3008)
Lock Washer s
5/16" I.D.
(736-0119)
Carriage Bolts
5/16-18 x 1-1/2" Long
(710-0262)
Hex Nuts
5/16-18 Thread
(712-3010)
ATTACHING THE CHUTE CRANK
C
Flat Washers
3/8" I.D. x 5/8" O.D.
(736-0185)
Hairpin Clip
(714-0104)
AUGER SHEAR BOLTS
F
The augers are secured to the spiral shaft with two shear bolts
and hex lock nuts. If you hit a foreign object or ice jam, the snow
thrower is designed so that the bolts will shear. Two replacement shear bolts and nuts are provided for your convenience.
Store in a safe place until needed.
Shear Bolts
5/16-18 x
1-1/2" Long
(710-0890A)
Hex Bolt
5/16-18 x 1-1/2"
Long
(710-0442)
Lock Washer
5/16" I.D.
(736-0119)
Hex Nut
5/16-18 Thread
(712-3010)
(784-5599)
Hex Lock Nuts
5/16-18 Thread
(712-0429)
Saddle
ATTACHING THE CHUTE ASSEMBLY
B
1/4-20 x 3/4" Long
Hex Lock Nuts
1/4-20 Thread
(712-3027)
ATTACHING THE SHIFT ROD
D
AND CLUTCH CABLES
Ferrule
(711-0677)
Flat Washers
5/16" I.D. x 5/8" O.D.
ATTACHING THE CLUTCH GRIPS
E
Hex Screw 5/16-18
x 2.0 (710-0116)
Hex T op L-Nut
5/16-18 (712-0429)
Hairpin Clips
(714-0104)
(736-0264)
“Z”-Fitting (R)
(746-0778)
.325 I.D. x .50 O.D. x .25
Hex Bolts
(710-3015)
Chute Flange
Keepers
(731-0851A)
Jam Nuts
#10-24 Thread
(712-0121)
Spacer
(750-1032)
5
SECTION 5: ASSEMBLY INSTRUCTIONS
IMPORTANT:
with gasoline, and check oil level as instructed in the
separate engine manual packed with your unit.
NOTE:
snow thrower are determined from behind the unit
in the operating position.
All references to right or left side of the
After assembly, service engine
UNPACKING
1. Remove staples or break glue on the top flaps of
the carton. Remove any loose parts like
operator’s manual or hardware pack included
with unit.
2. Cut along dotted lines and lay end of carton
down flat. Remove packing material.
3. Roll unit out of carton. Check carton thoroughly
for loose parts.
4. Extend cables out behind unit and lay them on
the floor.
5. Lay out the contents of the hardware pack
according to the illustration on page 5 and
identify each part.
6. Find the loose parts in the carton and lay these
on the floor. You should locate the following
loose parts in the carton:
1.Handle Panel
2.Right Handle
3.Left Handle
4.Auger Control Grip
5.Traction Drive Control Grip
6.Right Clutch Grip Bracket
7.Left Clutch Grip Bracket
8.Shift Rod (Not Illustrated)
9.Chute Crank Assembly (Not Illustrated)
10. Chute Assembly (Not Illustrated)
11. Hardware Pack (Not Illustrated)
Attaching the Handle Assembly.
(Hardware A and E)
Lay loose parts out on flat surface.
Control
1. Handle Panel
2. Right Handle
3. Left Handle
4. Auger Control Grip
4
3
1. Attach left handle and grip bracket to handle
panel with two carriagebolts, lock washers and
hexnuts. (Be sure the bend in the gripbracketis
towards the center of the handlepanel. (See
Figure 4.) Do not tighten at this time.
Outer
Edge
of Handle
Panel
Left Grip Bracket
5. Traction Drive
Grip
6. Right Grip Bracket
7. Left Grip Bracket
7
Figure 3
6
1
5
2
Handle Panel
Tools Required
The snow thrower comes partly assembled in the
carton. You will have to complete the assembly.
Follow assembly instructions in this operator’s
manual to make the job safe and easy. You will
need the following tools to assemble the snow
thrower.
A.Set of Wrenches (3/8", 9/16", 1/2" or
adjustable)
B. Pair of pliers
Carriage
Bolts
Left Handle
(curves in)
Lock Washer s
Figure 4
2. Locateauger control grip, part #4 in Figure 3.
The triangular metal tab on theauger control
grip must face the center of the handle panel.
(Hardware D)
6
3. Insert curved end of the Z fitting into the top
hole in the triangular metal tab on the auger
control grip. See Figure 5.
Triangle
Metal T ab
Auger Control
Grip
“Z” Fitting
Figure 5
4. Place the auger control grip on top of the left
handle. The triangular metal tab must be
between the handle and the grip bracket. See
Figure 6.
5. Secure with hex bolt, spacer and lock nut. See
Figure 6. (Do not overtighten this bolt as it will
prevent the grips from automatically returning to
their upright position.)
6. Repeat process for the right side Traction Drive
Control Grip.
7. Lay handle assembly behind snow thrower. See
Figure 7.
Hex Bolt
(5/16-18 x 3/4")
& Lock Washer
Figure 7
8. Insert a hex bolt and lock washer through the
lower hole on the bottom of the handle. See
Figure 7.
9. Hold the handle assembly up to the bottom of
the snow thrower frame and thread the hex bolt
into the lower hole in snow thrower frame. Do
not tighten at this time. See Figure 8.
Left
Handle
Spacer
Hex Screw
(5/16-18
x 2.0")
Handle
Panel
Auger Control Grip
Clutch Grip Bracket
Figure 6
Hex Lock Nut
(5/16-18)
“Z” Fitting
Figure 8
10. Repeat process on the other side.
11. Raise the handle assembly into the upright
position and align the top holes in the handles
with the top holes in the snow thrower frame.
Attach using hex bolts, lock washers and
saddles. (Curve in saddle must match the curve
in the handle.) See Figure 9 and Figure 10.
12. Tighten four carriage bolts and nuts used to
attach the handle panel to the right and left
handles in step 1.
13. Tighten all hardware used to attach the handle
assembly to the snow thrower frame.
7
Cable
Roller
Guide
Handle
Tab
Hex
Bolt 1-3/4”
Long
Figure 9
Hex Bolt
3/4” Long
Lock
Washers
Traction
Drive
Clutch
Hairpin
Clip
Hairpin
Flat
Washer
Clip
Flat
Washer
Hairpin
Clip
Figure 11
Flat
Washer
Flat
Washer
Shift
Lever
Ferrule
Shift
Rod
Assembly
Shift
Lever
Shift
Arm
Ferrule
Shift
Rod
Figure 10
ATTACHING SHIFT ROD
(Hardware D)
1. Place the shift lever in the fifth (5) or the fastest
forward speed position.
2.Models 642, 662: Rotate the shift arm
assembly counter clockwise, as far as it will go.
Insert the shift rod through the shift arm
assembly. When installed the shift arm
assembly should point to the right. Secure with
flat washer and hairpin clip. See Figure 11.
Model 614, 644, 664: Rotate the shift arm
assembly clockwise as far as it will go. Insert
the shift rod through the shift arm assembly.
When installed, the shift arm assembly should
point left. Secure with flat washer and hairpin
clip. See Figure 12.
Hairpin
Clip
Shift
Arm
Assembly
Figure 12
3.Models 642, 662: Thread the ferrule up or down
the shift rod and align with the lower hole on the
wider side of the shift lever assembly behind the
handle panel. See Figure 11.
Model 614, 644, 664: Thread the ferrule onto the
shift rod, up or down the shift rod and align with
the far hole on the narrow side of the shift lever
assembly behind the handle panel. See Figure 12.
4. Secure the ferrule to the shift arm assembly
with flat washer and hairpin clip.
NOTE:
Make certain to check for correct
adjustment of the shift rod as instructed in the
FINAL ADJUSTMENTS section before operating
the snow thrower.
8
ATTACHING CLUTCH CABLES
1. Thread the hex jam nuts all the way up the
threaded portion of the “Z” ends.
2. Make certain all cables are in the grooves of the
cable roller guides. The roller guides are located
in the lower rear of the unit. Lift the clutch grip in
the raised (up) position.
3. Thread the cable onto the threaded portion of
the “Z” end until there is no slack in the cable,
but the cable is NOT tight. Do not overtighten
cable. See Figure 13.
WARNING:
there is tension on the cable with the
clutch grip released, the safety features
of the snow thrower may be overridden.
If cable is tightened so
“Z” End
Hex Jam
Nut
Chute
Assembly
Hex Bolt
Hex Lock Nut
Chute Flange
Keeper
Figure 14
ATTACHING THE CHUTE CRANK
(Hardware C)
1. Insert hex bolt through the upper chute crank
bracket (located on the chute crank).
See Figure 15.
Lock Washer
Hex Nut
Cable is
Straight
Figure 13
4. When correct adjustment is reached, tighten the
hex nut against the cable to lock it in position.
ATTACHING THE CHUTE ASSEMBLY
(Hardware B)
1. Place chute assembly over chute opening, with
the opening in the chute assembly facing the
front of the unit.
2. Place chute flange keepers beneath lip of chute
assembly, flat side down.
3. Insert hex bolt up through chute flange keeper
and chute assembly as shown in Figure 14.
Secure with hex lock nut.
4. After assembling all three chute flange keepers,
tighten all nuts and bolts securely, then back off
1/4 turn to allow easier movement.
Hex Bolt
Upper Chute
Crank Bracket
Figure 15
2. Place the hex bolt into the hole provided in the
left handle. Secure with lock washer and hex
nut. Do not tighten at this point.
3. Loosen the carriage bolts and hex lock nuts
which secure the lower chute crank bracket to
the extension on the left side of the chute
assembly. See Figure 16.
Carriage Bolts
Hex Lock Nuts
Lower
Chute
Crank
Bracket
9
Figure 16
4. Place one flat washer on the end of the chute
crank, then insert the end of the crank into the
hole in the plastic bushing in the chute crank
bracket. See Figure 17.
Flat Washer
Hairpin Clip
Chute Crank
Bracket
Figure 17
5. Place the other flat washer on the end of the chute
crank, and insert hairpin clip into hole in the end of
crank. See Figure 17.
6. Adjust the chute bracket so that the spiral on the
chute crank fully engages the teeth on the chute
assembly.
7. Tighten the nuts on the lower chute crank bracket
securely. Tighten the hex bolt and nut on the upper
chute crank bracket on the handle .
Chute Crank
LAMP WIRING
Lamp Wire
Right Handle
Figure 18
1. Wrap the wire from the lamp down the right
handle until the wire can be plugged into the
alternator lead wire under the fuel tank. See
Figure 18. Be sure lamp wire does not interfere
with the movement of any controls or cables.
IMPORTANT:
clutch cables, check the adjustments as instructed,
and make any final adjustments necessary before
operating your snow thrower. Failure to follow the
instructions may cause damage to the snow thrower.
After attaching the shift rod and
Alternator
Lead
FINAL ADJUSTMENTS
Auger Drive Clutch
1. To check the adjustment of the auger drive
clutch, push forward on the left hand clutch grip
depressing the rubber bumper under the clutch
grip (See part #13 on page 22). There should be
slack in the cable.
2. Release the clutch grip. The cable should be
straight. Make certain you can depress the auger
drive clutch grip against the left handle
completely.
3. If necessary, loosen the hex jam nut and thread
the cable in (for less slack) or out (for more slack)
as necessary. Refer to Figure 13. Recheck the
adjustment. Tighten the jam nut against the cable
when correct adjustment is reached.
Traction Drive Clutch and Shift Lever
Adjustment
To check the adjustment of the traction drive clutch
and shift lever:
1. Move the shift lever all the way forward to sixth
(6) position. With the traction drive lever released,
push the snow thrower forward. The unit should
roll forward.
2. Then engage the traction drive clutch grip. The
wheels should stop turning.
3. Now release the traction drive clutch grip, and
push the unit again. Move the shift lever back to
the fast reverse position, then all the way forward
again. There should be no resistance in the shift
lever, and the wheels should keep turning.
4. If you have resistance when moving the shift
lever or the wheels stop when they should not,
loosen the jam nut on the traction drive cable and
unthread the cable one turn. If the wheels do not
stop when you engage the traction drive clutch
grip, loosen the jam nut on the traction drive
cable and thread the cable in one turn. Recheck
the adjustment and repeat as necessary.
5. Tighten the jam nut to secure the cable when
correct adjustment is reached.
NOTE:
the correct adjustment, refer to SECTION 8:
ADJUSTMENTS on page 14.
If you are uncertain that you have reached
10
Adjusting The Skid Shoes
The space between the shave plate and the ground
can be adjusted by adjusting the skid shoes.
1. Place skid shoes in the low position to remove
snow close to the ground. Place skid shoes in a
higher position to remove snow from uneven
ground. See Figure 19.
2. Adjust skid shoes by loosening the four hex
nuts and carriage bolts and moving skid shoes
to desired position. Make certain the entire
bottom surface of skid shoe is against the
ground to avoid uneven wear on the skid shoes.
Retighten nuts and bolts securely.
Skid
Shoe
Low Position
Hex Nuts
Carriage Bolts
Figure 19
WARNING:
that you operate this snow thrower on
gravel as loose gravel can be easily
picked up and thrown by the auger
causing an injury and/or damage to the
thrower.
snow
It is not recommended
High Position
SECTION 6: CONTROLS
THROTTLE CONTROL
The throttle control is located on the engine. It regulates
the speed of the engine.
SAFETY IGNITION SWITCH
The ignition key must be inserted in the switch before
the unit will start. Remove the ignition key when
snow thrower is not in use
FUEL SHUT-OFF
VALVE
The fuel shut-off valve,
located under fuel tank,
controls fuel flow from
tank. (If equipped)
(See Figure 21)
(See Figure 21)
Closed
Open
Figure 20
Starter
Handle
SHIFT LEVER
and 662. See Figure 23 for Model 614, 644, 664)
The shift lever is located in the center of the handle
panel. The shift lever may be moved into one of six
positions. Run engine with throttle in the fast
position. Use the shift lever to determine ground
speed.
Forward—Five forward speeds: position one (1) is
the slowest; position five (5) is the fastest.
Reverse—One reverse (R) speed.
NOTE:
Model 614, 644, 664 has seven positions
See Figure 22 for Models 642
.
AUGER DRIVE CLUTCH
(See Figure 22 for Models 642 and 662. See
Figure 23 for Model 614, 644, 664)
The auger drive clutch is located on the left handle.
Squeeze the auger drive clutch against the handle
to engage the augers. Release to stop the snow
throwing action.
TRACTION DRIVE CLUTCH
(See Figure 22 for Models 642 and 662. See
Figure 23 for Model 614, 644, 664)
The traction drive clutch is located on the right
handle. Squeeze the traction drive clutch to engage
the wheel drive. Release to stop.
Ignition
Key
Choke
Throttle
Figure 21
Primer
CHUTE CRANK
(See Figure 22 for Models 642 and 662. See
Figure 23 for Model 614, 644, 664)
The chute crank is located on left hand side of the
snow thrower.
To change the direction in which snow is thrown, turn
chute crank as follows:
Crank clockwise to discharge to the left
Crank counterclockwise to discharge to the right.
11
Auger
Drive
Clutch
Traction
Drive
Clutch
Auger
Drive
Clutch
Traction Drive
Clutch
Shift
Chute
Crank
Figure 22
Lever
SECTION 7: OPERATION
BEFORE STARTING
WARNING: Observe all Warning
Labels on the snow thrower prior to
use. See Figure 1.
Your snow thrower is shipped with oil; however,
you must check the oil level before operating.
Be careful not to overfill.
The spark plug wire was disconnected for safety.
Attach spark plug wire to spark plug before starting
GAS AND OIL FILL-UP
Check oil level and add oil if necessary. Service the
engine with gasoline as instructed in the separate
engine manual packed with your snow thrower.
Read instructions carefully.
WARNING: Never fill fuel tank
indoors, with engine running or while
engine is hot. Do not smoke when
filling fuel tank.
TO START ENGINE
NOTE:
augers) with the clutch grips disengaged, shut
engine off immediately. Readjust as instructed in
the Final Adjustments section of SECTION 5:
ASSEMBLY INSTRUCTIONS.
1. Attach spark plug wire to spark plug. Make
2. Make certain the fuel cutoff valve is in the
If unit shows any sign of motion (drive or
certain the metal loop on end of the spark plug
wire (inside the boot) is fastened securely over
the metal tip on the spark plug. See Figure 24.
OPEN (vertical) position. See Figure 20.
Chute
Crank
Figure 23
Metal Loop
on Spark
Plug Wire
Figure 24
3. Make certain the auger and drive clutch levers
are in the disengaged (released) position.
4. Move throttle control up to FAST position. Insert
ignition key into slot. See Figure 21. Be certain
it snaps into place. Do not turn key.
ENGINE WILL NOT START
UNLESS IGNITION KEY IS INSERTED INTO IGNITION
SLOT IN CARBURETOR
COVER. DO NOT TURN IGNITION KEY.
Shift
Lever
Rubber Boot
Electric Starter:
WARNING: The electric starter is
equipped with a three-wire power cord
and plug, and is designed to operate on
120 volt AC household current. It must
be properly grounded at all times to
avoid the possibility of electric shock
which may be injurious to the operator.
Follow all instructions carefully. If the
house wiring system is not a three-wire
grounded system, do not use this
electric starter under any conditions.
12
Follow all instructions carefully. Determine that your
house wiring is a three wire grounded system. Ask a
licensed electrician if you are not certain. If your
house wiring system is not a three-wire grounded
system, do not use this electric starter under any
conditions. If your system is grounded and a threehole receptacle is not available at the point your
starter will normally be used, one should be
installed by a licensed electrician.
When connecting the power cord, always connect
cord to starter on engine first, then plug the other
end into a three-hole grounded receptacle.
When disconnecting the power cord, always unplug
the end from the three-hole grounded receptacle
first.
1. Make certain the auger drive and traction drive
clutch grips are in the disengaged (released)
position.
2. Move throttle control up to FAST position. Insert
ignition key into slot. Refer to Figure 21 on page
11. Be certain it snaps into place. Do not turn
key.
3. Rotate choke knob to OFF position.
4. Connect power cord to switch box on engine.
Plug the other end of power cord into a threehole, grounded 120 volt AC receptacle.
5. Push starter button on top of the engine to
crank engine. As you crank the engine, move
choke knob to FULL choke position.
6. When engine starts, release starter button, and
move choke gradually to OFF. If engine falters,
move choke immediately to FULL and then
gradually to OFF.
7. Repeat steps 6 and 7 until engine starts. If
engine fails to start, repeat steps 5, 6, and 7
until engine starts.
8. As engine warms up and begins to operate
evenly, rotate choke knob slowly to OFF
position. If engine falters, return to FULL choke,
then slowly move to OFF position.
Recoil Starter.
1. Make certain the auger drive and traction drive
clutch grips are in the disengaged (released)
position.
2. Move throttle control up to FAST position. Insert
ignition key into slot. Refer to Figure 21 on page
11. Be certain it snaps into place. Do not turn
key.
3. Rotate choke knob to FULL choke position (cold
engine start).
If engine is warm, place choke in OFF position
instead of FULL.
4. Push primer button two or three times. Refer to
Figure 21 on page 11. If engine is warm, push
primer button once only.
NOTE: Always cover vent hole in primer button
when pushing. Additional priming may be necessary
for first start if temperature is below 15oF.
5. Grasp starter handle (refer to Figure 21 on page
11) and pull rope out slowly, until it pulls slightly
harder. Let rope rewind slowly.
6. Pull starter handle rapidly. Do not allow handle
to snap back. Allow it to rewind slowly while
keeping a firm hold on the starter handle.
7. Repeat steps 6 and 7 until engine starts. If
engine fails to start, repeat steps 5, 6 and 7 until
engine starts.
TO STOP ENGINE
1. Run engine for a few minutes before stopping to
help dry off any moisture on the engine.
2. To help prevent possible freeze-up of starter,
proceed as follows.
Electric Starter:
Connect power cord to switch box on engine, then
to 120 volt AC receptacle. With the engine running,
push starter button and spin the starter for several
seconds. The unusual sound made by spinning the
starter will not harm engine or starter. Disconnect
the power cord from receptacle first, and then from
switch box.
Recoil Starter:
With engine running, pull starter rope with a rapid,
continuous full arm stroke three or four times.
Pulling the starter rope will produce a loud clattering
sound, which is not harmful to the engine or starter.
3. To stop engine, remove the ignition key. Do not
turn key. Disconnect the spark plug wire from
the spark plug to prevent accidental starting
while equipment is unattended.
NOTE: Do not lose ignition key. Keep it in a safe
place. Engine will not start without the ignition key.
4. Wipe all snow and moisture from the carburetor
cover in the area of the control levers. Also,
move control levers back and forth several
times. Leave throttle control lever in the STOP
or OFF position. Leave choke control in the
FULL choke position.
13
TO ENGAGE DRIVE/AUGER
1. With the engine running near top speed, move
shift lever into one of the FORWARD or
REVERSE positions. Select a speed
appropriate for the snow conditions that exist.
Use the slower speeds until you are familiar
with the operation of the snow thrower.
2. Squeeze the left hand auger drive clutch to
engage auger.
3. While the left hand auger drive clutch is
engaged, engage the right hand traction drive
clutch.
NOTE: NEVER move shift lever without first
releasing the drive clutch.
TIRE CHAINS (OPTIONAL):
Use tire chains when extra traction is necessary.
OPERA TING TIPS
NOTE:
minutes as the engine will not develop full power
until it reaches operating temperature.
Allow the engine to warm up for a few
WARNING: Temperature of muffler and
surrounding areas may exceed 150
Avoid these areas.
• For most efficient snow removal, remove
snow immediately after it falls.
• Set the skid shoes 1/4" below the scraper bar
for normal usage. The skid shoes may be
adjusted upward for hard-packed snow.
Adjust downward when using on gravel or
crushed rock.
• Be certain to follow the precautions listed
under ‘‘To Stop Engine’’ in previous column
to prevent possible freeze-up.
• Clean the snow thrower thoroughly after each
use.
o
F.
SECTION 8: ADJUSTMENTS
WARNING: Never attempt to clean
chute or make any adjustments while
engine is running.
ADJUSTING CHUTE
You can control the distance that snow is thrown by
adjusting the angle of the chute assembly. The
sharper the angle, the shorter the distance snow is
thrown.
1. To adjust the chute, loosen the hand knob. See
Figure 25.
2. Pivot the top of the chute assembly to the
position desired.
Hand
Knob
Figure 25
ADJUSTING SKID SHOE
The space between the shave plate and the ground
can be adjusted by adjusting the skid shoe. Slide
the skid shoe upwards and lower the housing to
remove snow close to the ground. Slide skid shoe
downwards and raise the housing to remove snow
from uneven ground like gravel. For more details,
refer to page 11.
ADJUSTING TRACTION DRIVE CLUTCH
Refer to the Final Adjustments section on page 10
for instructions to adjust the traction drive clutch. If
you are not sure whether you have been able to
adjust the traction drive clutch properly, check as
follows.
1. Drain the gasoline from the snow thrower or put
a plastic film under the gas cap if the snow
thrower has already been operated. Tip the
snow thrower forward onto the auger housing.
2. Remove the frame cover underneath the snow
thrower by removing the six self-tapping screws.
3. With the traction drive clutch released, check if
there is clearance between the friction wheel
and the drive plate in all positions of the shift
lever. For correct adjustment there has to be
enough clearance.
4. With the traction drive clutch engaged, check if
the friction wheel is contacting the drive plate.
See Figure 26. For correct adjustment, these
two must contact.
14
5. If adjustment is necessary, loosen the jam nut
on the traction drive cable, and thread cable in
or out as necessary.
6. Tighten the jam nut to secure the cable when
correct adjustment is reached. Reassemble the
frame cover with six self-tapping screws.
Friction
Wheel
Model 614, 644, 664:
3. Push down on the shift arm assembly as far as
it will go. Thread the ferrule up or down the shift
rod and align it with the hole closest to the shift
knob on the narrow side of the shift lever
assembly behind the handle panel.
NOTE: Make certain to check for correct
adjustment of the shift rod as instructed in the Final
Adjustments section before operating the snow
thrower.
Gear
Shaft
Drive
Plate
Figure 26
Note: If you had earlier placed plastic film under
the gas cap, be sure to remove it once the
adjustment to the traction drive clutch is done and
the snow thrower frame is re-installed.
ADJUSTING AUGER CLUTCH
To adjust the auger clutch, refer to the Final
Adjustments section on page 10.
ADJUSTING SHIFT ROD
1. Remove the hairpin clip and flat washer from
the ferrule and remove the ferrule from the shift
lever. Place the shift lever in the fifth (5) or the
fastest forward speed position.
Models 642, 662:
2. Push up on the shift arm assembly as far as it
will go. Thread the ferrule up or down the shift
rod and align with the lower hole on the wider
side of the shift lever assembly behind the
handle panel. Secure the ferrule to the shift arm
assembly again with the hardware earlier
removed.
CARBURETOR ADJUSTMENT
WARNING: If any adjustments are
made to the engine while the engine is
running (e.g. carburetor), keep clear of
all moving parts. Be careful of heated
surfaces and muffler.
Minor carburetor adjustment may be required to
compensate for differences in fuel, temperature,
altitude and load.
Refer to the separate engine manual packed with
your unit for carburetor adjustment information.
DRIVE WHEELS
The wheels may be adjusted for two different
methods of operation. The adjustment is made by
placing the klick pins in one of two different holes on
the right side of the unit. See Figure 28.
1. One Wheel Driving—Place klick pin in the
outside axle hole on the right side. This position
gives power drive to the left wheel only, making
the unit easier to maneuver.
Both Wheels Driving—Place klick pin in the hole in
the hub next to the rim on the right side. This
position is good for heavy snow as there is power
drive in both wheels.
Klick Pin in Hole
in Hub Next to Rim
15
Outside Hole
in Axle
Figure 27
SECTION 9: LUBRICATION
WARNING: Disconnect the spark
plug wire and ground against the
engine before performing any
lubrication or maintenance.
ENGINE
Refer to engine manual for all engine lubrication
instructions.
WARNING: When following instruct-
ions in separate engine manual for
draining oil, be sure to protect frame to
avoid oil dripping onto transmission
parts.
CHUTE CRANK
The gear on the end of the chute crank should be
greased with multi-purpose automotive grease once
a season.
AUGER SHAFT
At least once a season, remove shear bolts on auger
shaft. Oil or spray lubricant inside shaft. See Figure
28. Also lubricate the auger bearings at least once a
season.
Shear Bolts
GEAR CASE
The gear case is lubricated with grease at the
factory and does not require checking. If
disassembled for any reason, lubricate with 2
ounces of Shell Alvania grease EPR00, part number
737-0168. Before reassembling, remove old sealant
and apply “Loctite 5699” or equivalent.
IMPORTANT: Do not overfill the gear case.
Damage to the seals could result. Be sure the vent
plug is free of grease in order to relieve pressure.
SECTION 10: MAINTENANCE
AUGERS
The augers are secured to the spiral shaft with two
shear bolts and hex lock nuts. Refer to Figure 28. If
you hit a foreign object or ice jam, the snow thrower
is designed so that the hex bolts will shear.
If the augers will not turn, check to see if the bolts
have sheared. Two replacement shear bolts and
hex lock nuts have been provided with the snow
thrower. For future use, order part number 7100890 (shear bolt 5/16-18 x 1.5" long) and 712-0429
(hex insert lock nut 5/16-18 thread).
Bearings
Figure 28
SPROCKET SHAFT
Lubricate the sprocket shaft with a light oil at least
once a season or after every 25 hours of operation.
IMPORTANT: Keep all grease and oil off of the
rubber friction wheel and aluminum drive plate.
DRIVE AND SHIFTING MECHANISM
At least once a season or after every 25 hours of
operation, remove the bottom frame cover.
Lubricate any chains, sprockets, gears, bearings,
shafts, and shifting mechanism at least once a
season. Use engine oil or a spray lubricant. Avoid
getting oil on rubber friction wheel and
aluminum drive plate.
SHAVE PLATE AND SKID SHOES
The shave plate and skid shoes on the bottom of
the snow thrower are subject to wear. They should
be checked periodically and replaced when
necessary.
To remove skid shoes, remove the four carriage
bolts, belleville washers and hex nuts which attach
them to the snow thrower. Reassemble new skid
shoes with the four carriage bolts, belleville washers
(cupped side goes against skid shoes) and hex
nuts. Make certain the skid shoes are adjusted to
the same level on both sides.
To remove shave plate, remove the carriage bolts,
belleville washers and hex nuts which attach it to
the snow thrower housing. Reassemble new shave
plate, making sure heads of the carriage bolts
are to the inside of the housing. Tighten securely.
ENGINE
Refer to separate engine manual for all engine
maintenance procedures.
BELT REMOVAL AND REPLACEMENT
WARNING:
plug wire from the spark plug and
ground.
Disconnect the spark
16
AUGER BELTS
NOTE: It is necessary to remove both belts in
order to change either one. If changing just one belt,
be certain to check the condition of the other belt.
1. Remove the plastic belt cover on the front of the
engine by removing the two self-tapping
screws. See Figure 29.
2. Drain the gasoline from the snow thrower, or
place a piece of plastic under the gas cap.
3. Tip the snow thrower up and forward so that it
rests on the auger housing.
Belt
Cover
Self-Tapping
Screws
5. Roll the front and rear auger belts off the engine
pulley. See Figure 30.
6. Unhook the idler spring from the hex bolt on the
auger housing. See Figure 31.
7. Back out the stop bolt to allow the belts to slip
between the bolt and auger pulley.
See Figure 32.
8. Lift the rear auger belt from the auger pulley,
and slip belt between the support bracket and
the auger pulley. See Figure 31. Repeat this
step for front auger belt.
9. Replace both auger drive belts by following
instructions in reverse order.
DRIVE BELT
1. Follow steps 1 through 4 of previous
instructions.
2. Pull idler pulley up, and lift belt off engine
pulley, idler pulley, and friction wheel disc.
See Figure 30.
3. Back out the stop bolt until the support bracket
rests on the auger pulley. See Figure 32.
4. Slip belt between friction wheel and friction
wheel disc. See Figure 31. Remove and replace
belt. Reassemble following the instructions in
reverse order.
Figure 29
4. Remove six self-tapping screws from the frame
cover underneath the snow thrower.
Rear
Auger
Belt
Idler
Pulley
Engine
Pulley
Idler
Pulley
Drive
Belt
Engine
Pulley
Front
Auger
Belt
Figure 30
NOTE: It may be necessary to loosen the six hex
nuts that fasten the frame to the auger housing to
aid in belt removal.
NOTE: The support bracket must rest on the stop
bolt after the new belt has been assembled. See
Figure 32.
Friction
Wheel
Support
Bracket
Rear
Auger
Belt
Front
Auger
Pulley
Auger
Pulley
Idler
Spring
Figure 31
Auger
Housing
Frame
Support
Bracket
Spring
17
Friction
Wheel
Disc
Support Bracket
Stop
Bolt
Figure 32
Friction Wheel
Drive Belt
CHANGING THE FRICTION WHEEL RUBBER
The rubber on the friction wheel is subject to wear
and should be checked after 25 hours of operation,
and periodically thereafter. Replace the friction
wheel rubber if any signs of wear or cracking are
found.
1. Drain the gasoline from the snow thrower, or
place a piece of plastic under the gas cap.
2. Tip the snow thrower up and forward, so that it
rests on the auger housing.
3. Remove six self-tapping screws from the frame
cover underneath the snow thrower.
4. Remove the klick pins which secure the wheels,
and remove the wheels from the axle.
5. Using a 7/8" wrench to hold the shaft, loosen,
but do not completely remove, the hex nut and
bell washer on the left end of gear shaft. See
Figure 33.
6. Lightly tap the hex nut to dislodge the ball
bearing from the right side of frame. Remove
the hex nut and bell washer from left end of
shaft.
7. Slide the gear shaft to the right and slide the
friction wheel assembly from the shaft.
8. Remove the six screws from the friction wheel
assembly (three from each side). Remove the
friction wheel rubber from between the friction
wheel plate.
9. Reassemble new friction wheel rubber to the
friction wheel assembly, tightening the six
screws in rotation and with equal force.
Position the friction wheel assembly up onto the pin
of the shift rod assembly, and slide the shaft
through the assembly. Reassemble in reverse order.
Hex Nut
Bell Washer
Figure 33
SECTION 11: OFF-SEASON STORAGE
WARNING: Never store engine with
fuel in tank indoors or in poorly
ventilated areas, where fuel fumes may
reach an open flame, spark or pilot
light as on a furnace, water heater,
clothes dryer or other gas appliance.
1. If unit is to be stored over 30 days, prepare the
engine for storage as instructed in the separate
engine operator’s manual included with your
unit.
18
2. Remove all dirt from exterior of engine and
equipment.
3. Follow lubrication recommendations on page 16.
NOTE: When storing any type of power
equipment in a poorly ventilated or metal storage
shed, care should be taken to rust proof the
equipment. Using a light oil or silicone, coat the
equipment, especially any chains, springs, bearings
and cables.
SECTION 12: TROUBLE SHOOTING GUIDE
TroublePossible Cause(s)Corrective Action
Engine fails to start Fuel tank empty, or stale fuel.
Blocked fuel line.
Choke not in ON position
Faulty spark plug.
Key not in switch on engine.
Spark plug wire
disconnected.
Primer button not depressed.
Fuel shut-off valve closed
(if so equipped).
Improper gasoline and oil
mixture.
Engine runs
erratic**
Loss of powerSpark plug wire loose.
Engine overheatsCarburetor not adjusted
Excessive vibration Loose parts or damaged
Unit fails to propel
itself
Unit fails to
discharge snow
Unit running on CHOKE.
Blocked fuel line or stale fuel.
Water or dirt in fuel system.
Carburetor out of adjustment.
Gas cap vent hole plugged.
Exhaust port plugged.
properly.
auger.
Incorrect adjustment of drive
cable.
Drive belt loose or damaged.
Discharge chute clogged.
Foreign object lodged in
auger.
Incorrect adjustment of drive
cable.
Drive belt loose or damaged.
Fill tank with clean, fresh gasoline. Fuel will not last over thirty
days unless a fuel stabilizer is used.
Clean fuel line.
Move switch to ON position
Clean, adjust gap or replace.
Insert key.
Connect spark plug wire.
Refer to the engine manual packed with your unit.
Open fuel shut-off valve.
Refer to the engine manual packed with your unit.
Move choke lever to OFF position.
Clean fuel line; fill tank with clean fresh gasoline. Fuel will not last
over thirty days unless a fuel stabilizer is used.
Drain fuel tank. Refill with fresh fuel.
Refer to the engine manual packed with your unit or have
carburetor adjusted by an authorized service dealer.
Connect and tighten spark plug wire.
Remove ice and snow from cap. Be certain vent hole is clear.
Clean-see Maintenance section of engine manual.
Refer to the engine manual packed with your unit or have
carburetor adjusted by an authorized service dealer.
Stop engine immediately and disconnect spark plug wire. Tighten
all bolts and nuts. Make all necessary repairs. If vibration
continues, have unit serviced by an authorized service dealer.
Adjust drive cable. Refer to Adjustment section of this manual.
Replace drive belt. Refer to Belt Replacement in Maintenance
section of this manual.
Stop engine immediately and disconnect spark plug wire. Clean
discharge chute and inside of auger housing.
Stop engine immediately and disconnect spark plug wire.
Remove object from auger.
Adjust drive cable. Refer to Adjustment section of this manual.
Replace drive belt. Refer to Belt Replacement in Maintenance
section of this manual.
Note: For repairs beyond the minor adjustments above, contact your local authorized service dealer.
For TWO YEARS from the date of retail purchase
within the United States of America, its possessions
and territories, MTD PRODUCTS INC will, at its
option, repair or replace, for the original purchaser,
free of charge, any part or parts found to be
defective in material or workmanship. This warranty
covers units which have been operated and
maintained in accordance with the operating
instructions furnished with the unit, and which have
not been subject to misuse, abuse, commercial use,
neglect, accident, improper maintenance or
alteration.
Normal wear parts or components thereof are
subject to separate terms as noted below in the “No
Fault Ninety Day Consumer Warranty” clause.
All normal wear part failures will be covered on this
product for a period of 90 days regardless of cause.
After 90 days, but within the two year period, normal
wear parts failures will be covered ONLY IF caused
by defects in material or workmanship of OTHER
component parts. Normal wear parts are defined as
batteries*, belts, blades, blade adapters, grass
bags, rider deck wheels, seats, snow thrower skid
shoes, shave plates and tires.
How to obtain service: Warranty service is
available, with proof of purchase, through your local
authorized service dealer. To locate the dealer in
your area, please check the yellow pages or contact
the Customer Service Department of MTD
PRODUCTS INC, P. O. Box 368022, Cleveland,
Ohio 44136-9722. Phone 1 (800) 800-7310. The
return of a complete unit will not be accepted by the
factory unless prior written permission has been
extended by the Customer Service Department of
MTD PRODUCTS INC.
Transportation charges: Transportation charges
for the movement of any power equipment unit or
attachment are the responsibility of the purchaser.
Units exported out of the United States: MTD
PRODUCTS INC does not extend any warranty
for products sold or exported outside of the United
States of America, its possessions and territories,
except those sold through MTD PRODUCTS INC’s
authorized channels of export distribution.
Other Warranties:
1. The engine or component parts thereof carry
separate warranties from their manufacturers.
Please refer to the applicable manufacturer’s
warranty on these items.
2. *Batteries are covered by a 90-day replacement
warranty.
3. Log splitter pumps, valves and cylinders or
component parts thereof are covered by a one
year warranty.
4. All other warranties, express or implied,
including any implied warranty of
merchantability or fitness for a particular
purpose, are hereby expressly disclaimed in
their entirety.
5. The provisions as set forth in this warranty
provide the sole and exclusive remedy of MTD
PRODUCTS INC’s obligations arising from the
sales of its products. MTD PRODUCTS INC will
not be liable for incidental or consequential loss
or damage.
How state law relates to this warranty: This
limited warranty gives you specific legal rights, and
you may also have other rights which vary from
state to state. Certain disclaimers are not allowed in
some states and therefore they may not apply to
you under all circumstances.
NOTE: This warranty does not cover routine
maintenance items such as lubricants, filters, blade
sharpening and tune-ups, or adjustments such as
brake adjustments, clutch adjustments or deck
adjustments. Nor does this warranty cover normal
deterioration of the exterior finish due to use or
exposure.
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