® O m m 'w//////al&_,411111111111111F / m mllllllllllllllllml m Operator's Manual Rear-tine Tiller Models 643C m Tuffy¢ / Bronco CRT 643B, 645A -- Super BroncoTM Mode1645A Shown IMPORTANT: Warning: Read safety rules and instructions This unit is equipped with an internal combustion carefully before operating engine and should not be used on or near any unimproved equipment.
TABLEOFCONTENTS Content Customer Support Safety Assembly Features and Controls Page 2 3 6 10 Operation Content Maintenance Off-season Storage Troubleshooting Parts List 12 Page 17 21 22 24 Warranty Back Cover FINDINGMODELNUMBER This Operator's Manual is an important part of your new tiller. It will help you assemble, prepare and maintain the unit for best performance. Please read and understand what it says.
SECTION1: SAFETY This machine meets voluntary safety standard B71.8-1996, which is sponsored by the Outdoor Power Equipment Institute, Inc., and is published by the American National Standards Institute. ForwardClutchBail ReverseClutchControl (Mode/s643B& 645A) WARNING DepthRegulator The engine exhaust from this productcontains chemicals known to the State of California to TineHoodFlap cause cancer, birth defects or other reproductive harm.
5.If theunitshould starttovibrate abnor- If in doubtaboutthe tilling conditions,al- 24. Do not touch engine parts which may mally, stoptheengine, disconnect the ways usethe following operating precau- be hot from operation. Let parts cool down sparkplugwireandprevent itfromtouch- tionsto assistyou in maintainingcontrol sufficiently. ingthesparkplug,andcheck immediatelyof the tiller: 25. Pleaseremember:Youcan alwaysstop a. Walk behindand to one side of the forthecause.
Decals Reverse Clutch Control Forward Clutch Bail For your safety and the safety of others, various safety and operational decals are located on your unit (seeFigure 1-2). Keepthe decals clean and legible at all times. Contactyour local service dealer or thefactory for replacementsif any decals are damagedor missing.
SECTION2: ASSEMBLY WARNING: To prevent personal injury or property damage,do not start the engine until all assembly steps are complete and you have read and understand the safety and operating instructions in this manual. INTRODUCTION Carefully follow these assembly steps to correctly prepare your tiller for use. It is recommendedthat you readthis Section in its entirety before beginning assembly. NOTE: Various tiller models are presented in this Manual.
The supportbracketsmust be assembledto the outside of the handlebar assembly. Fig.2-3: Wheelin FREEWHEEL position (wheeldrivepin throughwheelshaftonly). STEP 4: INSTALL FORWARD CLUTCH CABLE 1. Carefully unwrap the forward clutch cable (cable without an attached knob) from its shipping position and slide the thin cable wire (M, Fig. 2-4) into the slot in the cable bracket. Push the cable connector (N, Fig. 2-4) up through the hole in the bracket until the groove in the connector snaps into place. 2.
4. Checkfor correct tension on the forward drive belt by taking two measurements of the cable spring, as follows: a. With the Forward Clutch Bail (Y,Fig. 26) in an open (released)position, measure the length of the cable spring (W) from the outermost coil to the outermost coil. b. Squeezethe Forward Clutch Bail against the handlebar (see Fig. 2-7) and re-measure the spring length. The belt tension is correct if this second measurement is between 1/16" to 3/16" longer than the first measurement.
5! =-P6: CHECKTRAHSMiSSiOH OIL LEVEL Thetransmission was filled with gear oil at the factory. However,you should checkthe gear oil level at this time to make certain it is correct. IMPORTANT:Donot operatethe tiller if the gear oil level is low. Doing so will result in severe damageto the transmission components. 1. With the tiller on level ground, pull the Depth Regulator Lever (FF,Fig. 2-10) back and then all the way up until the lowest notch in the lever is engaged. 2. Removethe oil fill plug (GG,Fig.
SECTION3: FEATURES ANDCONTROLS _ operating your machine, ARNING: Before carefully readand understand all safety, controls and operating instructions in this Manual, the separateEngine Owner's Manual,and on the decals on the machine. Failureto follow these instructions can result in Forward Clutch ReverseClutchControl (Models643B& 645A) Regulator serious personal injury. INTRODUCTION This Section describes the location and Height Adjustment function of the controls on your tiller.
WARNING: Use extreme caution when reversing or pulling the machine towards you. Look behind to avoid obstacles. Never attempt to till in reverse. Failureto follow this warning could result in personal injury or property damage. To operatethe Reverse Clutch Control: 1. Put wheels in WHEELDRIVEposition (see "WARNING" statement at the left). Figure 3-3: FREEWHEELposition. WARNING: Beforestarting engine, be sure that both wheels are in WHEELDRIVE position. See WheelsDrive Pins for instructions.
SECTION4: OPERATION _ 1. Completethe Pre-Start Checkliston this page. ReverseClutchControl (Mode/s643B& operating your machine, ARNING: Before carefully readand understand all safety (Section 1), controls (Section 3) and operating instructions (Section 4) in this Manual, the separateEngine Owner's Manual,and on the decals on the machine. Failureto follow these instructions can result in 2. Putthe wheels in the WHEEL DRIVEposition (see WheelDrive Pinsin Section3 of this manual).
3. Start engine and allow it to warm up. Then put throttle in "FAST"setting. 4. For forwardmotion of the wheels and power to the tines: (a) Pull Forward Clutch Bail (Fig. 4-1) up against handlebar.Releasebail to stop forward motion of wheels and tines. (b) When tilling, relaxand let the wheels pull the unit while the tines dig. Walk behind and a little to one side of the unit. Use Stopping the Engineand Tiller 1.
TILLINGTIPS& TECHNIQUES Tilling Depths WAHNING: This is a CRT(counter-rotatingtine) tiller. As the wheels pull forward, the tines rotate backward. This createsan "uppercut" tine action which digs deeply,uprooting soil and weeds. Don't overloadthe engine,but dig as deeplyas possible on eachpass. On later passes,the wheelsmaytendto spinin thesoft dirt. Helpthem along by lifting up slightly on thehandlebar (one hand,palm up,works most easily).
TILLINGTIPS & TECHNIQUES (CON'T) Tilling OnSlopes Read the followingrecommendationsbeforetilling on slopes: WAHNING: If you must gardenon a moderateslope, pleasefollow two very importantguidelines: 1. Till only on moderateslopes,neveron steepground wherefooting is difficult (review safety rulesin Section 1: Safetyof this manual). 2. We recommendtilling up and down slopes ratherthan terracing. Tilling vertically on a slopeallows maximum plantingarea and also leavesroom for cultivating.
TILLINGTIPS & TECHNIQUES (CON'T) TerraceGardening(continued) • Tocreate a terrace, start at the top of the slopeand work down. Go back and forth acrossthe first row as shown in Fig.4-10. • Eachsucceedinglowerterrace is startedby walking belowthe terrace you're 0 preparing.Foraddedstability of thetiller, alwayskeepthe uphill wheel in thesoft, newlytilled soil. Do not till the last 12" or more of the downhill outside edge of eachterrace.
SECTION5: MAINTENANCE WARNING: Before TILLER LUBRICATION inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to come to a complete stop, disconnect spark plug wire and move wire away from spark plug. Remove ignition key on electric start models. Failureto follow these instructions can result in serious personal injury or property damage. MAINTENANCESCHEDULE After every 10 operating hours, oil or grease the lubrication points shown in Figure5-1 and described below.
moving parts to come to a completecleaning stop, disconnect spark wire and move wire away WARNING: Beforeinspecting, or servicing theplug machine,shut off engine, waitfrom for all spark plug. Failureto follow these instructions can result in serious personal injury or property damage. 4. Thegear oil level is correct if the gear oil is approximately halfway up the side of the main drive shaft. 5. If the gear oil level is low, add gear oil as described next.
,_ moving parts to come to a completecleaning stop, disconnect spark wire and move wire away WARNING: Beforeinspecting, or servicing theplug machine,shut off engine, waitfrom for all spark plug. Failureto follow these instructions can result in serious personal injury or property damage. b. Unthread the hex nut (C, Figure 5-4) halfway up the adjustment screw (D). c. Unhookthe top of the spring from the Forward Clutch Bail. d.
,_ moving parts to come to a completecleaning stop, disconnect spark wire and move wire away WARNING: Beforeinspecting, or servicing theplug machine,shut off engine, waitfrom for all spark plug. Failureto follow these instructions can result in serious personal injury or property damage. FORWARDCLUTCH BAIL ADJUSTMENT If the Forward Clutch Bail does not function properly, first checkthat the forward drive belt is adjusted properly (see Checking and Adjusting Forward Drive Belt Tension).
moving parts to come to a completecleaning stop, disconnect spark wire and move wire away WARNING: Beforeinspecting, or servicing theplug machine,shut off engine, waitfrom for all spark plug. Failureto follow these instructions can result in serious personal injury or property damage. 3. Cleanaround the oil dipstick or oil fill tube (whichever applies) to prevent dirt from failing into the crankcase. 4.
moving parts to come to a completecleaning stop, disconnect spark wire and move wire away WARNING: Beforeinspecting, or servicing theplug machine,shut off engine, waitfrom for all spark plug. Failureto follow these instructions can result in serious personal injury or property damage. TROUBLESHOOTING PROBLEM Enginedoes not start POSSIBLECAUSE CORRECTION Reconnectwire. 1. Spark plug wire disconnected. 2. Engine Throttle Control Lever incorrectly set. 2. Put lever in STARTposition. 3.
NOTES 23
Models643C, 643B & 645A Q 24
MODELS643C,643B & 645A REF NO. 1 PART NO. 686-04043 686-04041 2 710-0395 3 710-0597 4 710-0599 5 710-0874 6 710-3008 7 712-04063 8 712-04064 9 715-0108 10 732-04320 11 736-0275 12 750-04149 REF NO. DESCRIPTION PART NO. DESCRIPTION TineHoodAssembly(A) TineHoodAssembly(B)(C} HexScrew,5/16-18x 2.25 HexHd.
MODELS643C,643B & 645A REF NO. 1 2 3 4 5 PARTNO. -- GW-9517 GW-1714 GW-50043 711-04110 GW-1224-1 * GW-1224-2" GW-1224-3" GW-1224-4" GW-1325C DESCRIPTION Snap Ring Bearing, Tapered Roller (with race) Support Washer, Rear Drive Shaft Shim, RearBearing Cap, .010"thick Shim, sameas above, except .030" thick Shim, same asabove, except .005"thick Shim, sameas above, except .062" thick Shim Set (Incl. the following shims: two #1224-1, two 1224-2 & one #1224-4) * Useas required to obtain between .005" and .
MODELS643C,643B & 645A 2 3 4 I 7 FRONT j/ 7 4 3 2 REF NO. 2 3 4 5 (A) ForModel643C (B) ForModel643B (C) ForModel645A 6 7 8 9 10 11 PARTNO. 1909950 GW-1166-1 * GW-1166-2" GW-1166-3" GW-1166-4" GW-1166-5" GW-1086 711-04512 711-04486 GW-9305 GW-1132-2 1904278 711-04078 GW-1104 1916542 DESCRIPTION Retainer,SnapRing Shim,0.062"thick Shim,0.030"thick Shim,0.015"thick Shim,0.010"thick Shim,0.
MODELS643C,643B & 645A Model 643C 28
MODELS643C,643B & 645A REF NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 PARTNO. REF NO. DESCRIPTION 27 28 736-0159 FlatWasher, 5/16 756-04198 Pulley, Engine Drive 656-04023 Transmission Pulley (A) 656-04005 Transmission Pulley (B} (C) 29 756-04169 Pulley, ReverseIdler (B) (C) 786-04095 PARTNO. DESCRIPTION 736-0119 Lock Washer, 5/16 (A) 750-0535 Spacer,.380 IDx .625 OD x .21 (A) 736-3050 736-3090 FlatWasher .406 x .812 x .
NOTES 30
NOTES 31
TROY-BILT TILLER LIFETIME LIMITED WARRANTY WHAT PRODUCT IS COVERED All Troy-Bilt branded rear tine walk-behind tillers with gear drive transmissions. This warranty begins on the date of purchase and is warranted by Troy-Bilt LLC for the life of the tiller, to the original purchaser only.
