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Operator's Manual
Rear-tine Tiller Models
640C-- Tuffy_ CRT
644A m Super Bronco TM CRT
Mode1644A Shown
IMPORTANT: Read safety rules and instructions carefully before operating equipment.
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 attester meeting applicable local or state law
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TABLEOFCONTENTS Content Page Content Page Customer Support 2 Maintenance 17 Safety 3 Off-season Storage 21 Assembly 6 Troubleshooting 22 Features and Controls 10 Parts List 23 Operation 12 Warranty Back Cover FINDINGMODELNUMBER This Operator's Manual is an important part of your new lawn tractor. 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 t
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SECTION 1: SAFETY This machine meets voluntary safety stan- dard B71.8-1996, which is sponsored bythe Outdoor Power Equipment Institute, Inc., and is published by the American National Standards Institute. ForwardClutchBail Reverse ClutchControl (Models644A) WARNING DepthRegulator The engine exhaust from this productcontains chemicals known to the State of California to TineHoodFlap cause cancer, birth defects or other reproduc- SafetyAlertSymbol in this manual and on the unit to alert Standard-
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4.Exercise caution toavoid slipping orfall- If indoubtaboutthetilling conditions, al- 24. Do not touch engine parts which may ing. ways usethe following operating precau- behot from operation.Let parts cool down tionsto assistyouin maintainingcontrol sufficiently. 5.Iftheunitshould start tovibrate abnor- of the tiller: 25. Pleaseremember:Youcan alwaysstop mally, stoptheengine, disconnect the a. Walk behindandto one side of the spark plug wireandprevent itfromtouch- the tines and wheels by releas
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Decals ReverseClutch Control Forward ClutchBail For your safety and the safety of others, vari- OperatingInstruction (Models 644A) ous safety and operational decalsare located on your unit (seeFigure 1-2). Keepthe decalsclean and legible at all times. StartingStabilization Contactyour local service dealeror thefactory Message (on engine) for replacementsif any decalsaredamagedor missing. WarningMessages Referto the Parts List pagesin this Manualfor decal locations, descriptions and part num- ber
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SECTION 2: ASSEMBLY ASSEMBLY STEPS WARNING: Toprevent personal injury or property STEP 1: UNPACKING INSTRUCTIONS damage,do not start the engine _iiii NOTE:While unpacking, do not severely until all assemblysteps are bend any control cables. complete andyou have read and understandthe safety and 1. The tiller weighs approximately 133 Ibs. operating instructions in this Do not attempt to remove it from the ship- manual. ping platform until instructed to do so in these Assembly steps. INTRODUCTION
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°-! ° Fig. 2-3: Wheel in FREEWHEEL position A STEP 4: INSTALL FORWARD CLUTCH CABLE 1. Carefully unwrap the forward clutch ca- ble(cable without an attached knob) from its shipping position and slide the thin ca- blewire (T,Fig. 2-4) into the slot in the ca- blebracket. Push the cable connector (U, Fig.2-4) upthrough the holein the bracket until the groove in the connector snaps into place. 2. Threadthe #10-24 hex nut (Z, Fig. 2-5) halfway onto the screw (V) which runs J through the spring (W, Fi
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4. Checkfor correct tension onthe forward drive belt by taking two measurements of the cable spring, as follows: a. With the Forward Clutch Bail (Y,Fig. 2- 6) in an open (released)position, measure the length of the cable spring (W) from the outermost coil to the outermost coil. b. Squeeze the ForwardClutch Bailagainst the handlebar(see Fig. 2-7) and re-mea- sure the spring length. The belt tension is correct if this second measurementis be- tween 1/16" to 3/16" longer than the first measurement
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5! 6: CHECK TRAHSMiSSiOH I El-'/: AUU IVlUI UH UIL _1 El-' 8: I.;HEI.;K HAHUWAHE OIL LEVEL Thetiller is shipped withoutoil in the en- Checkall nuts and screws for tightness. gine. Thetransmission was filled with gearoil at STEP g: CHECK AIR PRESSURE IN the factory. However,you should checkthe IMPORTANT:Do not start the engine with- TIRES (unitswithpneumatictires) gear oil level at this time to makecertain it out first adding motor oil. Severeengine Checkthe air pressurewith a tire gauge. is corr
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SECTION 3: FEATURES ANDCONTROLS operating your machine, _ ARNING: Before carefully readand understand all safety, controls and operating instructions in this Manual,the separateEngine ForwardClutch Bail ReverseClutchControl Owner's Manual,and on the decalson the machine. Failureto follow these (Model 644A) instructions can result in serious personal injury. gulator INTRODUCTION HandlebarHeight Adjustment This Section describes the location and function of the controls on your tiller. Refer to th
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begintilling at avery shallow depth setting and gradually increasethe tilling depth. _--'i_ caution when reversing or _ WARNING: Useextreme A pulling the machinetowards Y ,,_- D you. Look behindto avoid to till too deeplytoo quickly. _b ARNING: Do not attempt obstacles. Graduallywork down to deeper Neverattemptto till in reverse. tilling depths. Failureto follow this warning Placethe DepthRegulator could result in personal injury Lever in the "travel" position or property damage. before starting
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SECTION 4: OPERATION 1. Completethe Pre-StartCheckliston this Reverse Clutch Control page. operating your machine, _ ARNING: Before (Model644A) carefully readand understand 2. Putthe wheels inthe WHEELDRIVEpo- all safety (Section 1), controls sition (see WheelDrivePinsin Section3 of (Section 3) and operating this manual). instructions (Section4) inthis Manual,the separateEngine ClutchBail preventserious personal injury ,_ WARNING: Tohelp ,epthRegulator Owner's Manual,and on the or damageto equip
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3. Start engineand allow it to warm up. (b) Swing the handlebarto the left so the Then put throttle in "FAST"setting. right wheeltakes a "step" backward.Next 4. For forwardmotion of the wheels and swing the handlebarto the right so the left wheel"steps" backward.Repeatas needed. power to the tines: (a) Pull Forward Clutch Bail (Fig.4-1) up (c) If longer distances needto becovered against handlebar.Releasebail to stop for- in reverse,shut off the engine, then place ward motion of wheels and tines
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TILLINGTIPS& TECHNIQUES Tilling Depths This is a CRT(counter-rotatingtine) tiller. As the wheelspullforward, the tinesrotateback- ward. Thiscreatesan "uppercut" tine actionwhich digs deeply,uprooting soil and weeds. Don't overloadthe engine,but dig as deeplyas possibleon eachpass. Onlater passes,the WAHNING: Before wheelsmaytendto spinin thesoft dirt. Helpthemalongby lifting upslightly onthehandlebar tilling, contact your (onehand,palm up,works most easily). telephone or utilities company and in
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TILLINGTIPS& TECHNIQUES (CON'T) Tilling On Slopes Readthe followingrecommendationsbeforetilling on slopes: WAHNING: Do not Ifyou must gardenon a moderateslope,pleasefollow two very importantguidelines: operatetiller on aslope too steepfor safe operation.Till 1. Till only on moderateslopes,neveronsteepgroundwherefooting is difficult (reviewsafe- slowly and besure you have ty rulesin Section1: Safetyof this manual). good footing. Neverpermit 2. We recommendtilling up and down slopes ratherthan ter
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TILLINGTIPS& TECHNIQUES (CON'T) TerraceGardening(continued) • Tocreateaterrace, start at the top of the slopeand work down. Gobackand forth acrossthe first row as shown in Fig.4-10. • Eachsucceedinglowerterraceis startedby walking belowthe terraceyou're O m_ preparing.Foraddedstability of thetiller,alwayskeepthe uphillwheel inthesoft, newlytilled soil. Do not till the last 12"or more of the downhill outsideedgeof eachterrace.Thisuntilled strip helpspreventsthe terracesfrom breakingapart andwashi
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SECTION 5: MAINTENANCE WARNING: Before TILLER LUBRICATION If acover is leaking,check for loose screws. If the screws aretight, a new inspecting, cleaning or servicing After every 10 operating hours, oil or gasket or oil seal may be required. the machine, shut off engine, grease the lubrication points shown in wait for all moving parts to come If the leak is from around a shaft and oil Figure5-1 and described below. to acomplete stop, disconnect seal, the oil seal probably needsto be Useclean lub
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moving partsto come to a complete stop, disconnect spark plug wire and move wire awayfrom WARNING: Beforeinspecting, cleaning or servicing the machine,shut off engine, wait for all spark plug. Failureto follow these instructions can result in serious personal injury or property damage. B. ToDrain theTransmissionGear Oil: 4. Thegear oil level is correct if the gear oil BOLO TINES is approximately halfway upthe side of the Thetransmission gear oil does not needto The bolo tines will wear with usea
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moving partsto come to a complete stop, disconnectspark plug wire and move wire awayfrom ,_ WARNING: Beforeinspecting, cleaning or servicing the machine,shut off engine, wait for all spark plug. Failureto follow these instructions can result in serious personal injury or property damage. b. Unthreadthe hex nut (C,Figure 5-4) halfway up the adjustment screw (D). c. Unhookthe top of the spring from the Forward Clutch Bail. d. Usepliers to preventthe adjuster (B) from turning andturn the slotted sc
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moving partsto come to a complete stop, disconnectspark plug wire and move wire awayfrom ,_ WARNING: Beforeinspecting, cleaning or servicing the machine,shut off engine, wait for all spark plug. Failureto follow these instructions can result in serious personal injury or property damage. 5. Releasethe ReverseClutch Control FORWARDCLUTCH Replacement Belt Information knob.andthen unthread the inner jam nut BAIL ADJUSTMENT If the drive belt needsto be replaced,see (C, Figure 5-6) oneto two turns. P
