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Troy-Bilt 640C-Tuffy CRT - page 1
Rear-tine Tiller Models 640C — T uffy ® CR T 644A — Super Bronco TM CR T Model 644A Shown Oper ator’ s Man ual PRINTED IN U.S. A. 769-00585C OM.fm 9/15/04 FORM NO. IMPOR T ANT : Read saf ety r ules and instructions carefully before operating equipment. Warning: This unit is equipped with an internal co mbustion engine and should not be used ...
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Troy-Bilt 640C-Tuffy CRT - page 2
2 TABLE OF CONTENTS FINDING MODEL NUMBER This Operator’s Ma nual is an important part of your new lawn tractor. It will help you assemble , prepare and maintain the unit for best performance. Please r ead and understand wha t it says. Before you start as sembling your new equipment , plea se locate th e model plate on the equipment a nd copy the ...
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Troy-Bilt 640C-Tuffy CRT - page 3
3 Training 1. Carefully read this Own- er’ s Manual, the separate Engine Owner’ s Manual, and any other literature you may receive. Be thoroughly familiar with the controls and the proper use of the tiller and its en- gine. Know how to stop the unit and disen- gage the controls quickly . 2. Never allow children to operate the tiller . Never all ...
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Troy-Bilt 640C-Tuffy CRT - page 4
4 4 . Exercise caution to avoid slipping or fall- ing. 5 . If the unit should start to vibrate abnor- mally , stop the engine, disconnect the spark plug wire and prevent it from touch- ing the spark plug, and check immediately for the cause. Vibration is generally a warning of trouble. 6 . Stop the engine, disconnect the spark plug wire and prevent ...
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Troy-Bilt 640C-Tuffy CRT - page 5
5 Decals For your safety and the safety of others, vari- ous safety and operational decals are located on your unit (see Figure 1-2). Keep the decals clean and legible at all times. Contact your local service dealer or the factory for replacements if any decals are damaged or missing. Refer to the Parts List pages in this Manual for decal locations ...
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Troy-Bilt 640C-Tuffy CRT - page 6
6 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 recommended that you read this Section in it ...
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Troy-Bilt 640C-Tuffy CRT - page 7
7 drive pin (M) through the wheel shaft only (not through the wheel hub). Secure the wheel drive pin with the hairpin cotter (L), pushing the hairpin cotter in as far as it will go. The wheel should now spin freely (freewheel) on the wh eel shaft. Repeat with the other wheel. 4. Use the handlebar to roll the tiller to a flat area. IMPORT ANT: Befor ...
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Troy-Bilt 640C-Tuffy CRT - page 8
8 4. Check for correct tens ion on the for ward 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 Forward Clutch Bail against the handlebar (see ...
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Troy-Bilt 640C-Tuffy CRT - page 9
9 STEP 6: CHECK TRANSMISSION OIL LEVEL The transmission was filled with gear oil at the factory . However , you should check the gear oil level at this time to make certain it is correct. IMPORT ANT : Do not operate the tiller if the gear oil level is low . Doing so will result in severe damage to the transmission com- ponents. 1. With the tiller o ...
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Troy-Bilt 640C-Tuffy CRT - page 10
10 WARNING: Before operating your machine, carefully read and understand all safety, controls and operating instructions in this Manual, the separate Engine Owner’s Manual, and on the decals on the machine. Failure to follow these instructions can result in serious personal injury. INTRODUCTION This Section describes the location and function of ...
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Troy-Bilt 640C-Tuffy CRT - page 11
11 WARNING: Before starting engine, be sure that both wheels are in WHEEL DRIVE position. See Wheels Drive Pins for instructions. Engaging the Forward Clutch Bail or Reverse Clutch Control (if equipped) when the wheels are not in WHEEL DRIVE could allow the tines to rapidly propel the tiller forward or backward. Failure to comply could cause loss o ...
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Troy-Bilt 640C-Tuffy CRT - page 12
12 WARNING: Before operating your machine, carefully read and understand all safety (Section 1), controls (Section 3) and operating instructions (Section 4) in this Manual, the separate Engine Owner’s Manual, and on the decals on the machine. Failure to follow these instructions can result in serious personal injur y . INTRODUCTION Read this Oper ...
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Troy-Bilt 640C-Tuffy CRT - page 13
13 Stopping the Engine an d Tiller 1. T o stop the wheels and tines, release the Forward Clutch Bail (all models) or the Re- verse Clutch Control (Model 6 4 4A) — whichever control is in use. 2. T o stop the engin e, put the ignition switch and/or the throttle control lever in the “OFF” or “STOP” position. OPER ATING THE TILLER The follow ...
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Troy-Bilt 640C-Tuffy CRT - page 14
14 Preparing Seedbeds Tilling wet soil often results in large, hard clumps of soil that can inter fere with plant- ing. If time permits, wait a day or two after heavy rains to allow the s oil to dry before tilling. T est soil by squeezing it into a ball. If it compresses too easily , it is too wet to till. Avoid Tilling Soggy, Wet Soil Whenever pos ...
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Troy-Bilt 640C-Tuffy CRT - page 15
15 Tilling On Slopes Read the following recomm endations before tilling on slopes: If you must garden on a moderate slope, please follow two ver y important guidelines: 1. Till only on moderate slopes, never on steep ground where footing is difficult (review safe - ty rules in Section 1 : Safety of this ma nual). 2. We recommend tilling up and down ...
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Troy-Bilt 640C-Tuffy CRT - page 16
16 Terrace Gardening (conti nued) • T o 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 walk ing below the terrace you’re preparing. For added stability of the tiller , always ke ep the uphill whe el in the soft, newly ti ...
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Troy-Bilt 640C-Tuffy CRT - page 17
17 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. Remove ignition key on electric start models. Failure to follow these instructions can result in serious personal injury or property damage. NOTES 1 - ...
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Troy-Bilt 640C-Tuffy CRT - page 18
18 4. The gear 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. If the gear oil level is okay , securely replace the oil fill plug. IMPORT ANT : Do not operate the tiller if the gear oil level is low . Doing so will result in severe d ...
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Troy-Bilt 640C-Tuffy CRT - page 19
19 CHECKING AND ADJUSTING FORW ARD DRIVE BELT TENSION It is important to maintain correct tension on the forward drive belt . A l oose bel t w ill cause the tines and wheels to sl ow do wn — or stop completely — even though the en- gine is running at full speed. A too tight belt can result in u nintentional tine move- ment when the clutch bail ...
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Troy-Bilt 640C-Tuffy CRT - page 20
20 FORW ARD CLUTCH BAIL ADJUSTMENT If the Forward Clutch Bail does not func- tion properly , first check that the forward drive belt is adjusted properly (see Check- ing and Adjusting Forward Drive Belt T en- sion ). If this fails to correct the problem, contact T roy-Bilt LLC or your authorized dealer for service advice. CHECKING AND ADJUSTING RE- ...
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Troy-Bilt 640C-Tuffy CRT - page 21
21 3. Clean around the oil dipstick or oil fill tube (whichever applies) to prevent dirt from falling into the crankcase. 4. On engines with an oil fill tube, remove the fill cap and add oil (if required) until it reaches the top of the fill tube. Reinstall the fill cap. 5. On engines with a dipstick, remove it and wipe it clean. Reinsert the dipst ...
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Troy-Bilt 640C-Tuffy CRT - page 22
22 TROUBLESHOOTING PROBLEM POSSIBLE CAUSE CORRECTION Engine does not start 1. Spark plug wire disconnected. 1. Reconnect wire. 2. Engine Throttle Control L e ver incorrectly set. 2. Put lever in ST ART position. 3. Fuel tank em pty . 3. Add fuel. 4. Choke control (if so equipped) in inco rrect position. 4. See Engine Owner’ s Manual. 5. Stale gas ...
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Troy-Bilt 640C-Tuffy CRT - page 23
23 Section 6 Parts List 5 1 3 14 2 11 18 17 16 10 9 7 4 15 12 6 4 15 1 7 9 7 19 20 13 7 21 22 24 23 REF NO. P A RT NO. DESCRIPTION 1 715-0108 Spirol Pin 2 710-0597 Hex Hd. Screw, 1/4-20 x 1 3 710-0599 Screw, Self -Tapping,1/4-20 x 1/2 4 710-0874 Hex Hd. Screw, 5/16-18 x 1-1/4 5 710-3008 Hex Hd. Screw, 5/16-18 x .75 6 712-04064 Hex Lock Nut, Nylon, ...
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Troy-Bilt 640C-Tuffy CRT - page 24
24 MODELS 640C & 644A 5 10 2 5 15 1 12 16 21 3 13 20 4 17 11 22 7 25 8 6 23 14 18 18 7 9 ...
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Troy-Bilt 640C-Tuffy CRT - page 25
25 MODELS 640C & 644A REF NO. P A RT NO. DESCRIPTION 1 749-04193 Bumper (B) 2 710-0395 Hex Screw, 5/16-18 x 2-1/4, Gr5 (B) 3 726-0201 Nut, Speed, 5/16-18 (B) 4 712-04063 Hex Lock Nut, Nylon, 5/16-18 (B) 1 4 3 2 REF NO. P A RT NO. DESCRIPTION 1 1916719 Cable Assembly, Reverse Clutch (B) 2 1916755 Upper Handlebar 3 747-04210 Bail, Forward Clutch ...
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Troy-Bilt 640C-Tuffy CRT - page 26
26 MODELS 640C & 644A * Use as required to obt ain between .005” and .015” allowable end-play . REF NO. P ART NO. DESCRIPTION 1 GW-9517 Snap Ring 2 GW-1714 Bearing, Tapered Roller (with race) 3 GW-50043 Support Washer, Rear 4 711-04110 Drive Shaft 5 GW-1224-1* Shim, Rear Bear ing Cap, .010" thick GW-1224-2* Shim, same as abov e, except ...
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Troy-Bilt 640C-Tuffy CRT - page 27
27 MODELS 640C & 644A * Use as required to obt ain between .005” and . 030” allowable end-play . REF NO. P A RT NO. DESCRIPTION 1 GW-9512 Retainer, Snap Ring, “E” Type 2 1909950 Retainer, Snap Ring 3 GW-1166-1* Shim, 0.062" thick GW-1166-2* Shim, 0.030" thick GW-1166-3* Shim, 0.015" thick GW-1166-4* Shim, 0.010" thic ...
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Troy-Bilt 640C-Tuffy CRT - page 28
28 MODELS 640C & 644A 9 24 28 20 30 25 27 1 1 11 5 17 19 28 1 12 10 14 16 38 32 31 3 2 7 8 37 19 39 33 4 38 34 FORWARD CLUTCH CABLE 35 41 28 24 22 22 24 6 13 21 28 16 29 18 36 23 40 REVERSE CLUTCH CABLE 15 28 26 42 43 ...
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Troy-Bilt 640C-Tuffy CRT - page 29
29 MODELS 640C & 640A REF NO. P A RT NO. DESCRIPTION 1 736-0159 Flat Washer, 5/16 2 714-0139 Key, 3/16" x 2" (A) 1108841 Key, 3/16" x 1-1/2" (B) 3 1916351 Pulley, Engine Drive 4 656-04023 Transmission Pulley (A) 656-04005 Transmission Pulley (B) 5 1916535 Pulley, Reverse Idler (B) 6 1916652 Guard, Belts/Pulleys 7 1916657 For ...
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Troy-Bilt 640C-Tuffy CRT - page 30
30 FORWARD MODELS 640C & 644A REF NO. P A RT NO. DESCRIPTION 1 710-0514 Hex Hd. Screw , 3/8-16 x 1, Grade 5 2 GW-50049-02 Single Bolo Tine - Left Hand 3 712-3000 Hex Lock Nut, 3/8-16 4 710-0347 Hex Hd. Screw, 3/8-16 x 1-3/4 5 GW-50049-01 Single Bolo Tine - Right Hand 6 1915075 Tine Holder (A) 1916747 Tine Holder (B) 7 1917486 Wheel & Tire A ...
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Troy-Bilt 640C-Tuffy CRT - page 31
31 NOTES ...
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Troy-Bilt 640C-Tuffy CRT - page 32
TR O Y -BIL T TILLER LIFETIME LIMITED W ARRANTY WHAT PRODUCT All Troy-Bilt brand ed rear tine walk-behind tillers with gear drive transmissions. IS COVERED This warranty begins on the date of p urchase and is warranted by Troy-Bilt LLC for the life of the tiller, to the origin al purchaser only. WHAT IS COVERED Troy-Bilt LLC will, at its option, re ...
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