MTD 750, 550 User Manual

Operator’s Manual

Snow Boss 550

(H623D)

Snow Boss 750

(H633E)

IMPORTANT: Read safety rules and instructions carefully before operating equipment.

Warning:

covered, brush-covered or grass-covered land unless the engine’s exhaust systemisequippedwith 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 theState of Californiathe above is required bylaw (Section 4442 of the California Public Resources Code). Otherstates 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 361131 Cleveland, Ohio 44136-9722.

WHITE OUTDOOR PRODUCTS COMPANY. P.O. BOX 361131 CLEVELAND, OHIO 44136-9722

PRINTED IN U.S.A.

This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-

FORM NO.

770-10014A.mif

(6/99)

TABLE OF CONTENTS

Content Page

Important Safe Operation Practices...................................................................3

Loose Parts........................................................................................................5

Assembling Your Snow Thrower........................................................................5

Know Your Snow Thrower .................................................................................7

Operating Your Snow Thrower...........................................................................8

Making Adjustments ..........................................................................................10

Maintaining Your Snow Thrower........................................................................11

Service...............................................................................................................12

Troubleshooting.................................................................................................16

Parts List............................................................................................................17

FINDING MODEL NUMBER

This Operator’s Manual is an important part of your new Snow Thrower. It will help you assemble, prepare and maintain the unit for best performance. Please read and understand what it says.

Before you start assembling your new equipment, please locate the model plate on the equipment and copy the information from it in the space provided below. The information on the model plate is very important if you need help from our Customer Support Department or an authorizeddealer.

• You can locate the model number by looking at the lower frame cover in the rear of your snow thrower. A sample model plate is explained below. For future reference, please copy the model number and the serial number of the equipment in the space below.

(Model Number)

(Serial Number)

WHITE OUTDOOR

PRODUCTS COMPANY

P.O. BOX 361131

CLEVELAND,OHIO 44136

Copy the model number here:

Copy the serial number here:

CALLING WARRANTY SERVICE

If you are having difficulty assembling this product or if you have any question regarding the controls, operationor maintenanceof this unit, please callthe CustomerDealer ReferralLine. You can reach them by calling:

1-800-949-4483

Before calling your local dealer, make sure that you have your model and serial numbers ready. By having the model and serial numbers ready, you help your local dealer give you faster service.

SECTION 1: IMPORTANT SAFE OPERATION PRACTICES

This Warning 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.

DANGER:Your snow thrower was built to be operated according to the rules for safe 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. Failure to observe the following safety instructions could result in serious injury or death.

TRAINING

• Read this operators 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 operationshould 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.

PREPARATION

• Thoroughly inspectthe areawhere the equipmentis 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 offany 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 objectsthat may be thrown from the machine in any direction.

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.

• 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 the auger, 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 throwerwithout 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 machineat high transportspeeds 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 accessoriesapproved by the manufacturer of snow thrower (such as wheel weights, counter weights, cabs, etc.).

• Never operate the snow thrower without good visibilityor light. Alwaysbe 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.

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 insidea building whereignition 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 operators 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 preventfreeze up of collector/impeller.Check clutch controls periodically to verify they engage and disengageproperly and readjust if necessary.Refer to operators manual for adjustment instructions.

Y our 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. Some of the safety labels on the equipment are reproduced below. Take a moment to study these labels before operating the unit. Always maintain safety while operating or servicing the equipment.

AND CLOTHING AWAY. KEEP HANDS, FEET ROTATING AUGER AVOID INJURY FROM

SHUT OFF ENGINE

BEFORE

UNCLOGGING

DISCHARGE CHUTE.

DANGER

WARNING

STOP ENGINE BEFORE REMOVING

1. DEBRIS AND SERVICING UNIT.

KEEP CLEAR OF IMPELLER WHILE

2. ENGINE IS RUNNING.

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.

SECTION 2: LOOSE PARTS

The snow thrower is shipped with following loose parts in the carton. Please remove all loose parts from the carton before discarding it. See Figure 1 to identify the parts noting that these parts may be referred to again in the following sections of this manual. Part numbers are shown in parentheses.

Shear Bolts (710-0890A)

HexLockNuts (712-0429)

Figure 1

AUGER SHEAR BOLTS

The augers are secured to the auger 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 may shear. Two replacement shear bolts and nuts are provided for your convenience. Store in a safe place until needed.

IMPORT ANT :NEVER replace the auger shear bolts with standard

hex bolts. Any damage to the auger gearbox or other components as a result of doing so will NOT be covered by your snow thrower’s warrant y.

SECTION 3: ASSEMBLING YOUR SNOW THROWER

NOTE:

side of the snow thrower is observed from the operator’s position.

IMPORTANT: Make any final adjustments as instructed

later on in this section BEFORE operating your snow thrower. Failure to follow the instructions may cause damage to the snowthrower.

• Remove screws from the top sides and ends of the

• Set panel aside to avoid tire punctures or personal

• Remove and discard plastic bag that covers unit.

• Roll unit out of crate.

• Remove the lower two plastic wing knobs, cupped

Any reference in this manual to the left or right

shipping crate. injury.

washers and carriage bolt (eyebolt on the left side) from the lower handle. See Figure 2.

• Raise the upper handle assembly until it locks over the lower handle. See Figure 2 and Figure 3.

• Lookat thelower rear of snow throwerframeto be sure both cables are aligned with cable roller guides.

• Secure the upper handle and lower handle with the two plastic wing knobs, cupped washers and carriage bolt (eyebolt on the left side)previously removed. See Figure 3.

Hex Nut

Connector

Wing Knobs,

Washers

and Bolts

Figure 2

Eyebolt

Wing Knobs

Figure 3

• Adjust the eyebolt on the chute directional control so the rod does not come into contact with the engine by moving the hex nut against the handle (if necessary). Retighten the wing nut to secure the directional control in this position.

• Slide the connector down over the end of the lower shift rod. See Figure 3. Tap the connector until it locks on the lower shift rod.

NOTE:

If the connector is not properly assembled, the shift rod will pivot and you will not be able to change speeds or change directions.

• If not already attached, slip the cables that run from

the handle panel to the chute into the cable guide located on top of the engine. See Figure 4.

Cable Guide

Figure 4

• Unwrap the headlight wire which is attached to the

headlight, beneath the handle panel. Wind the headlight wire around the right handle until excess slack is removed.

• Plug the wire from the headlight into the wire lead

coming from the right side of the engine, beneath thefueltank.

• Recheck the adjustment before retightening the jam nut against the cable.

Skid Shoe Adjustment

The space between the shave plate and the ground can be adjusted by repositioning the skid shoes found on either side of the snow throwers auger housing. For close snow removal, place skid shoes in the low position.Usemiddleorhighpositionwhenareatobe cleared is uneven. See Figure 6.

Final Adjustments

Auger Control Adjustment

Check the adjustment of the auger control as follows:

• Push forward on the auger control (Refer to Figure

7) until the small rubber bumper contacts the upper handle. There should be slack in the cable.

• Release the auger control. The cable should be straight. Make certain you can depress the auger control against the left handle completely.

If adjustment is necessary, proceed as follows:

• Loosen the jam nut and thread the cable in (for less slack) or out (for more slack) as necessary. See Figure 5.

“Z” End

Jam Nut

Auger Control Cable

Figure 5

Skid

Shoes

Figure 6

IMPORT ANT : It is NOT recommended that this snow

thrower be operated on a gravel surface, asloose stones can be easily picked up and thrown by the machine. If you must operate on a gravel surface, ALWAYS adjust the skid shoes into the HIGH position to allow the shave plate maximum clearance.

Adjust skid shoes as follows:

• Loosen, but do NOT remove, the three hex nuts which fasten the skid shoe to the auger housing.

• Raiseor lower the skid shoe to desired position.

NOTE:

Make certain the entire base of both skid shoes

Hex Nuts

are against the ground to avoid uneven wear on the skid shoes. When one side does wear out, the skid shoes are reversable.

• Retighten the hex nuts loosened earlier.

• Repeat this adjustment on the skid shoe found on the opposite side of the snow thrower.

Tire Pressure Adjustment

The tires are over-inflated for shipping purposes. Check tire pressure and reduce to between 15 psi and 20 psi.

NOTE:

unit may pull to one side or the other.

If the tire pressure is not equal in both tires, the

Traction Control and Shift Lever Adjustment

To check the adjustment of the traction control and shift lever, proceed as follows:

• Move the shift lever into sixth (6) position. a. Withthetractioncontrol(refertoFigure7in

Section 4 of this manual) released, gently push the snow thrower forward, then pull it back. Disregarding the overall weight of the snow thrower, the machine should otherwise move freely.

b. Engage the traction control, and attempt to

movethem machine both forwardand rearward. You should experience resistance as the wheels should not be turning.

• Move the shift lever into the fast reverse (R2)

position and repeat the previous steps (a & b). If you experienced resistance either when repositioning theshiftleverfrom6toR2orwhenattemptingtomove the machine forward or rearward with the traction controlreleased,your snow thrower’straction controlis

in need of adjustment and you should NOT operate the machine before completing the adjustment as follows:

• Loosen the jam nut on the traction control cable and UNTHREAD the cable one full turn.

• Recheckthe adjustment.

• Retighten the jam nut to secure the cable when correct adjustment is reached.

If the machine can be moved freely both forward and rearward when the traction control fully depressed, proceed as follows:

• Loosenthejamnutonthetractiondrivecableand THREAD the cable in one full turn.

• Recheck the adjustment and repeat adjustment as necessary.

• Retighten the jam nut to secure the cable when correct adjustment is reached.

NOTE:

correct adjustment, refer to Traction Control Adjustment in Section 6 of this manual.

SECTION 4: KNOW YOUR SNOW THROWER

IMPORT ANT : Always release tractionalcontrol before

T ractio n Control /

Auger Control Lock

Auger

Control

Chute

Tilt

Control

Chute Directional

Control

Figure 7

Shift

Lever

Traction Control / Auger Contr ol Lock

The traction control is located on the right handle. Squeeze the traction control to engage the wheel drive. Releasetostop.

This same lever also locks the auger control so you can turn the chute directional control without interrupting the snow throwing process. If the auger control is engaged along with the traction control, the operator can release the auger control (on the left handle) and the augers will remain engaged. Release the traction control to stop both the augers and wheel drive (auger control must also be released).

changing speeds.

Headlight

The headlight is on whenever the engine is running.

Shift Lever

The shift lever is located in the center of thehandlepanelandisusedto determine both ground speed and direction of travel. It can be moved into any of eight positions.

Forward

Your snow thrower has six forward (F) speeds. Position number one (1) is the slowest. Position number six (6) is the fastest.

Reverse

Your snow thrower has two reverse (R) speeds. R1 is the slower, while R2 is the faster of the two.

IMPORT ANT : Always release tractionalcontrol before

changing speeds.

Auger Control

The auger drive clutch is located on the left handle. Squeeze the clutch grip to engage the augers. Release to stop the snow throwing action. (Traction control must also be released.)

If you are uncertain that you have reached the

Chute Directional Contr ol

The chute directional control is located on left side of the snow thrower.

To change the direction in which snow is thrown, turn chute directional control as follows:

• Crank clockwise to discharge to the left.

• Crankcounterclockwise to dischargeto theright.

Chute Tilt Contr ol

The distance snow is thrown can be adjusted by adjusting the angle of the chute assembly. Move the chute tilt control forward to decrease the distance, toward the rear to increase.

Fuel Shut-off Valve

The fuel shut-off valve, located under fuel tank, controls fuel flow from thetank. Always make certain it is in the Open (vertical) position before attempting to start the engine.

Closed

Open

Primer

Choke

Rope

Ignition Key

Throttle Control

Figure 8

Starter Handle

Safety Ignition Key

The safety ignition key must be fully inserted in the switch before the unit will start. Remove the ignition key when snow thrower is not in use.

Throttle Control

The throttle control is located on the engine. It regulates the speed of the engine.

IMPORT ANT : Do NOT attempt to turn the key.

SECTION 5: OPERATING YOUR SNOW THROWER

Gas And Oil Fill-up

IMPORT ANT :Although your snow thrower comes

shipped with oil already in the engine, you MUST check the engine oil level as instructed in the separate engine manual packed with your unit BEFORE starting the engine for the first time. Read instructions carefully

Service the engine with gasoline and oil 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.

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. 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 three-hole 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 tostarteronenginefirst,thenplugtheotherendintoa three-hol egrounded receptacle .

When disconnecting the power cord, always unplug the end from the three-hole grounded receptacle first.

To Start Engine

IMPORT ANT : If unit shows any sign of motion(traction

oraugers) with the controls disengaged, shut engine off immediately. Readjust as instructed under the heading Final Adjustments in Section 3 of this manual.

• Attachsparkplugwiretosparkplug.

• Make certain the fuel shut-off valve is in the open (vertical) position.

• Make certain that both the auger control and the traction control are in the disengaged (released) position.

• Move throttle control up to FAST position. Insert ignition key into slot. See Figure 8. Be certain it snaps into place. Do not turn the key.

• Rotate choke knob to FULL choke position (cold engine start). If engine is warm, place choke in OFF position instead of FULL.

• Electric Start Only: Connect power cord to switch box on engine. Plug the other end of power cord into a three-hole, grounded 120 volt AC receptacle.

• Recoil Start Only: Push primer button two or three times when using recoil starter. If engine is warm, pushprimerbuttononceonly.SeeFigure8.

NOTE:

pushing. Additional priming may be necessary for first start if temperature is below 15

• Electric Start: Do NOT prime engine. Push starter

• Recoil Start: Grasp starter handle (see Figure 8)

• As engine warms up and begins to operate evenly,

Alwayscoverventholeinprimerbuttonwhen

button on top of the engine to crank the engine. When engine starts, release starter button.

and pull rope out slowly, until it pulls slightly harder. Let rope rewind slowly. 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.

rotate choke knob slowly to OFF position. If engine falters, return to FULL choke, then slowly move to OFF position.

To Stop Engine

• Run engine for a few minutes before stopping to help dry off any moisture on the engine.

• To help prevent possible freeze-up of starter, proceed as follows: ElectricStarter: 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 (Optional Instructions): 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.

• Tostop 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:

Engine will not start without the ignition key.

• Wipe all snow and moisture from the carburetor

Do not lose ignition key. Keep it in a safe place.

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.

To Engage Drive

• With the engine running near top speed, move shift lever into one of the six FORWARD positions or two REVERSE positions. Select a speed appropriate for the snow conditions that exist.

NOTE:

with the operation of the snow thrower.

• Squeeze the traction control against the right

IMPORT ANT :NEVER move shift lever without first

releasing the traction control. Doing so will cause premature wear to drive system’s friction wheel rubber.

Use the slower speeds until you are familiar

handle and the snow thrower will move. Release it and the drive motion will stop.

To Engage Augers

To engage the augers and start the snow throwing action, squeeze the auger control against the left handle.

To disengage power to the augers, release both the auger control and the traction control, if engaged,

NOTE:

can turn the chute directional control without interrupting the snow throwing process. Refer to Traction Control/ Auger Control Lock in Section 4 of this manual.

The auger control can also be locked so you

Tire Chains (Optional Equipme nt)

Tire chains should be used whenever extra traction is needed. See your local White Outdoor dealer for information regarding tire chains and other optional accessories for your snow thrower.

Operating Tips

NOTE:

as the engine will not develop full power until it reaches operating temperature.

• Set the skid shoes 1/4" below the shave plate for

• Remove snow immediately after it falls.

• Discharge snow downwind whenever possible.

Allow the engine to warm up for a few minutes

WARNING: Temperature of muffler and surrounding areas may exceed 150

Avoid these areas.

normal usage. The skid shoes may be adjusted upward(to lower the shave plate)for hard-packed snow. Adjust downward (to raise the shave plate) whenusingongravelorcrushedrock.

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