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Operator’s Manual
Rear-tine Tiller Models
®
643C, 643D Tuffy / Bronco CRT
TM
643B, 645A Super Bronco
Model 645A 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 arrester meeting applicable local or state laws (if
any). If a spar
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TABLE OF CONTENTS 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 24 Operation 12 Warranty Back Cover FINDING MODEL NUMBER 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. 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 by the Outdoor Power Equipment Institute, Inc., and is published by the American National Standards Institute. Forward Clutch Bail Reverse Clutch Control (Models 643B & 645A) WARNING Depth Regulator The engine exhaust from this product contains chemicals known to the State of California to Tine Hood Flap cause cancer, birth defects or other reproduc- tive harm. Safety Alert Symbol This is a s
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5. If the unit should start to vibrate abnor- If in doubt about the tilling conditions, al- 24. Do not touch engine parts which may mally, stop the engine, disconnect the ways use the following operating precau- be hot from operation. Let parts cool down spark plug wire and prevent it from touch- tions to assist you in maintaining control sufficiently. ing the spark plug, and check immediately of the tiller: 25. Please remember: You can always stop for the cause. Vibration is generally a a. W
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Decals Reverse Clutch Control Forward Clutch Bail Operating Instruction For your safety and the safety of others, vari- (Models 643B & 645A) ous safety and operational decals are located on your unit (see Figure 1-2). Keep the decals clean and legible at all times. Starting Stabilization Contact your local service dealer or the factory Message (on engine) for replacements if any decals are damaged or missing. Warning Messages Refer to the Parts List pages in this Manual for decal locatio
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SECTION 2: ASSEMBLY WARNING: To prevent ASSEMBLY STEPS personal injury or property STEP 1: UNPACKING INSTRUCTIONS damage, do not start the engine NOTE: While unpacking, do not severely until all assembly steps are bend any control cables. complete and you have read and understand the safety and 1. The tiller weighs approximately 133 lbs. operating instructions in this Do not attempt to remove it from the ship- manual. ping platform until instructed to do so in 1 1 these Assembly steps
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I M O N The support brackets must be assembled to the outside L of the handlebar assembly. Fig. 2-3: Wheel in FREEWHEEL position (wheel drive pin through wheel shaft only). D G STEP 4: INSTALL FORWARD A CLUTCH CABLE 1. Carefully unwrap the forward clutch ca- ble (cable without an attached knob) from its shipping position and slide the thin ca- C ble wire (M, Fig. 2-4) into the slot in the ca- F ble bracket. Push the cable connector (N, Fig. 2-4) up through the hole in the bracket E until
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BRONCO 4. Check for 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. 2- 6) in an open (released) position, measure the length of the cable spring (W) from the Z outermost coil to the outermost coil. X b. Squeeze the Forward Clutch Bail against the handlebar (see Fig. 2-7) and re-mea- sure the spring length. The belt tension is correct if this second measurement is be- Hold bail against handlebar w
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STEP 6: CHECK TRANSMISSION STEP 7: ADD MOTOR OIL STEP 8: CHECK HARDWARE OIL LEVEL The tiller is shipped without oil in the en- Check all nuts and screws for tightness. gine. The transmission was filled with gear oil at STEP 9: CHECK AIR PRESSURE IN the factory. However, you should check the IMPORTANT: Do not start the engine with- TIRES (units with pneumatic tires) gear oil level at this time to make certain it out first adding motor oil. Severe engine Check the air pressure with a tire
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SECTION 3: FEATURES AND CONTROLS WARNING: Before operating your machine, carefully read and understand all safety, controls and operating instructions in this Manual, the separate Engine Forward Clutch Bail Reverse Clutch Control Owner’s Manual, and on the (Models 643B & 645A) decals on the machine. Failure to follow these instructions can result in Depth Regulator serious personal injury. INTRODUCTION This Section describes the location and Handlebar Height Adjustment function of the
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begin tilling at a very shallow depth setting WARNING: Use extreme and gradually increase the tilling depth. caution when reversing or A pulling the machine towards WARNING: Do not attempt you. Look behind to avoid D to till too deeply too quickly. obstacles. B Gradually work down to deeper Never attempt to till in reverse. tilling depths. Failure to follow this warning Place the Depth Regulator could result in personal injury C Lever in the “travel” position or property damage. be
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SECTION 4: OPERATION 1. Complete the Pre-Start Checklist on this WARNING: Before Reverse Clutch Control page. operating your machine, (Models 643B & 645A) carefully read and understand 2. Put the wheels in the WHEEL DRIVE po- all safety (Section 1), controls sition (see Wheel Drive Pins in Section 3 of (Section 3) and operating this manual). instructions (Section 4) in this WARNING: To help Forward Manual, the separate Engine Clutch Bail prevent serious personal injury Owner’s Manual
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3. Start engine and allow it to warm up. (b) Swing the handlebar to the left so the Then put throttle in “FAST” setting. right wheel takes a “step” backward. Next swing the handlebar to the right so the left 4. For forward motion of the wheels and wheel “steps” backward. Repeat as needed. power to the tines: (a) Pull Forward Clutch Bail (Fig. 4-1) up (c) If longer distances need to be covered against handlebar. Release bail to stop for- in reverse, shut off the engine, then place ward moti
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TILLING TIPS & TECHNIQUES Tilling Depths � This is a CRT (counter-rotating tine) tiller. As the wheels pull forward, the tines rotate back- ward. This creates an “uppercut” tine action which digs deeply, uprooting soil and weeds. Don’t overload the engine, but dig as deeply as possible on each pass. On later passes, the WARNING: Before wheels may tend to spin in the soft dirt. Help them along by lifting up slightly on the handlebar tilling, contact your (one hand, palm up, works most easily).
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TILLING TIPS & TECHNIQUES (CON’T) Tilling On Slopes Read the following recommendations before tilling on slopes: WARNING: Do not If you must garden on a moderate slope, please follow two very important guidelines: operate tiller on a slope too steep for safe operation. Till 1. Till only on moderate slopes, never on steep ground where footing is difficult (review safe- slowly and be sure you have ty rules in Section 1: Safety of this manual). good footing. Never permit 2. We recommend tilli
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TILLING TIPS & TECHNIQUES (CON’T) Terrace Gardening (continued) � To create a terrace, start at the top of the slope and work down. Go back and forth across the first row as shown in Fig. 4-10. � Each succeeding lower terrace is started by walking below the terrace you’re preparing. For added stability of the tiller, always keep the uphill wheel in the soft, newly tilled soil. Do not till the last 12" or more of the downhill outside edge of each terrace. This untilled strip helps prevents the t
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SECTION 5: MAINTENANCE If a cover is leaking, check for loose WARNING: Before TILLER LUBRICATION screws. If the screws are tight, 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 Figure 5-1 and described below. to a complete stop, disconnect seal, the oil seal probably needs
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WARNING: Before 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. Failure to follow these instructions can result in serious personal injury or property damage. 4. The gear oil level is correct if the gear oil B. To Drain the Transmission Gear Oil: BOLO TINES is approximately halfway up the side of the The transmission gear oil does not need to The bolo tines wi
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WARNING: Before 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. Failure to 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. Unhook the top of the spring from the Forward Clutch Bail. d. Use pliers to prevent the adjuster (B) from turning and tur
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WARNING: Before 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. Failure to follow these instructions can result in serious personal injury or property damage. 5. Release the Reverse Clutch Control Replacement Belt Information FORWARD CLUTCH knob.and then unthread the inner jam nut If the drive belt needs to be replaced, see BAIL ADJUSTMENT (C, Figure 5-6) one
