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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 it from touching the 
spark plug, whenever you leave the operat-
ing position, before unclogging the tines, 
or when making any repairs, adjustments 
or inspections.

7.

 Take all possible precautions when leav-

ing the machine unattended. Stop the en-
gine. Disconnect the spark plug wire and 
move it away from the spark plug. Be sure 
that both wheels are in the Wheel Drive po-
sition. 

8.

 Before cleaning, repairing, or inspect-

ing, stop the engine and make certain all 
moving parts have stopped. Disconnect 
the spark plug wire and prevent it from 
touching the spark plug to prevent acci-
dental starting. 

9.

 The flap on the tine hood must be down 

when operating the tiller.

10.

 Never use the tiller unless proper 

guards, plates, or other safety protective 
devices are in place.

11.

 Do not run the engine in an enclosed 

area. Engine exhaust contains carbon 
monoxide gas, a deadly poison that is 
odorless, colorless, and tasteless.

12.

 Keep children and pets away.

13. Never operate the tiller under engine 
power if the wheels are in the Freewheel 
position.

 In the Freewheel position, the 

wheels will not hold the tiller back and the 
revolving tines could propel the tiller rapid-
ly, possibly causing loss of control. Always 
engage the wheels with the wheel drive 
pins in the Wheel Drive position before 
starting the engine or engaging the 
tines

wheels with the Forward Clutch Bail 

(all models) or the Reverse Clutch control 
(Model 644A only).

14.

 

Be aware that the tiller may unex-

pectedly bounce upward or jump forward 
if the tines should strike extremely hard 
packed soil, frozen ground, or buried ob-
stacles like large stones, roots, or 
stumps. 

If in doubt about the tilling conditions, al-
ways use the following operating precau-
tions to assist you in maintaining control 
of the tiller:

a. Walk behind and to one side of the

tiller, using one hand on the handle
bars Relax your arm, but use a 
secure hand grip.

b.  Use shallower depth regulator 

settings, working gradually deeper
with each pass.

c.  Use slower engine speeds.
d.  Clear the tilling area of all large

stones, roots or other debris. 

e.  Avoid using downward pressure on

the handlebars. If need be, use
slight upward pressure to keep the
tines from digging too deeply.

f.  Before contacting hard packed soil

at the end of a row, reduce engine
speed and lift the handlebars to
raise the tines out of the soil.

g.  In an emergency, stop the tines and

wheels by releasing whichever
clutch control is engaged. Do not
attempt to restrain the tiller.

15.

 Do not overload the tiller’s capacity by 

attempting to till too deeply at too fast a 
rate.

16.

 Never operate the tiller at high trans-

port speeds on hard or slippery surfaces. 
Look behind and use care when backing 
up.

17.

 Do not operate the tiller on a slope that 

is too steep for safety. When on slopes, 
slow down and make sure you have good 
footing. Never permit the tiller to freewheel 
down slopes.

18.

 Never allow bystanders near the unit.

19.

 Only use attachments and accessories 

that are approved by the manufacturer of 
the tiller.

20.

 Use tiller attachments and accessories 

when recommended.

21.

 Never operate the tiller without good 

visibility or light.

22.

 Never operate the tiller if you are tired; 

or under the influence of alcohol, drugs or 
medication.

23.

 Operators shall not tamper with the en-

gine-governor settings on the machine; 
the governor controls the maximum safe 
operating speed to protect the engine and 
all moving parts from damage caused by 
overspeed. Authorized service shall be 
sought if a problem exists.

24.

 Do not touch engine parts which may 

be hot from operation. Let parts cool down 
sufficiently.

25.

 Please remember: You can always stop 

the tines and wheels by releasing the For-
ward Clutch Bail or on Model 644A the Re-
verse Clutch control, (whichever control is 
engaged), or by moving the ignition switch 
and

or throttle control lever on the engine 

to “OFF” or “STOP”.

26.

 To load or unload the tiller, see the in-

structions in Section 4 of this Manual.

27.

 Use extreme caution when reversing 

or pulling the machine towards you.

28.

 Start the engine carefully according to 

instructions and with feet well away from 
the tines.

29.

 Never pick up or carry a machine while 

the engine is running.

Maintenance and Storage

1.

 Keep the tiller, attachments and acces-

sories in safe working condition.

2.

 Check all nuts, bolts, and screws for 

proper tightness to be sure the equipment 
is in safe working condition.

3.

 Never store the tiller with fuel in the fuel 

tank inside a building where ignition sourc-
es are present such as hot water and space 
heaters, furnaces, clothes dryers, stoves, 
electric motors, etc.). Allow the engine to 
cool before storing the unit in any enclo-
sure.

4.

 To reduce the chances of a fire hazard, 

keep the engine free of grass, leaves, or ex-
cessive grease.

5.

 Store gasoline in a cool, well-ventilated 

area, safely away from any spark- or 
flame-producing equipment. Store gaso-
line in an approved container, safely away 
from the reach of children.

6.

 Refer to the Maintenance sections of 

this Manual and the separate Engine Own-
er’s Manual for instructions if the unit is to 
be stored for an extended period.

7.

 Never perform maintenance while the 

engine is running or the spark plug wire is 
connected, except when specifically in-
structed to do so.

8.

 If the fuel tank has to be drained, do this 

outdoors.

Summary of Contents for 640C - Tuffy CRT

Page 1: ...engine s exhaust system is equipped with 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 the State of California the above is required by law Section 4442 of the California Public Resources Code Other states may have similar laws Federal laws apply on federal lands A spark arrester for ...

Page 2: ...n seek help from the experts Choose from the options below Visit troy bilt com for many useful suggestions Click on Customer Support button and you will get the four options reproduced here Click on the appropriate button and help is immediately available If you prefer to reach a Customer Support Representative please call 1 800 520 5520 The engine manufacturer is responsible for all engine relate...

Page 3: ...igars pipes open flames and sparks away from the fuel tank and fuel container d Fill fuel tank outdoors with extreme care Never fill fuel tank indoors Use a funnel or spout to prevent spillage e Replace all fuel tank and container caps securely f If fuel is spilled do not attempt to start the engine but move the ma chine away from the area of spillage and avoid creating any source of ig nition unt...

Page 4: ...ls by releasing whichever clutch control is engaged Do not attempt to restrain the tiller 15 Do not overload the tiller s capacity by attempting to till too deeply at too fast a rate 16 Never operate the tiller at high trans port speeds on hard or slippery surfaces Look behind and use care when backing up 17 Do not operate the tiller on a slope that is too steep for safety When on slopes slow down...

Page 5: ...AND SHIELDS IN PLACE AND WORKING NEVER ALLOW CHILDREN OR UNINSTRUCTED ADULTS TO OPERATE TILLER SHUT OFF ENGINE AND DISCONNECT SPARK PLUG WIRE BEFORE MANUALLY UN CLOGGING TINES OR MAKING REPAIRS KEEP BYSTANDERS AWAY FROM MACHINE KEEP AWAY FROM ROTATING PARTS USE EXTREME CAUTION WHEN REVERSING OR PULLING THE MACHINE TOWARDS YOU Operating Symbols Varioussymbols shownhere withworddescriptions maybeuse...

Page 6: ...your local dealer or the factory items are missing or dam aged NOTE Use the screw length template Fig 2 1 to identify screws Loose Parts List Qty Description 1 Handlebar Support see A Fig 2 2 1 Handlebar Assembly see K Fig 2 2 Hardware bag contents 4 Hex hd screw 5 16 18 x 1 1 2 2 Hex hd screw 3 8 16 x 3 4 2 Flat Washer 3 8 4 Split lock washer 5 16 4 Hex nut 5 16 18 2 Hex locknut 3 8 16 Model 644A...

Page 7: ...in Wheel Drive Pins in Section 3 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 ble wire T Fig 2 4 into the slot in the ca ble bracket Push the cable connector U Fig 2 4 up through the hole in the bracket until the groove in the connector snaps into place 2 Thread the 10 24 hex nut Z F...

Page 8: ... 8 and Fig 2 9 from its shipping po sition and route it up to the handlebar Be sure that the cable is routed beneath the Forward Clutch Bail 2 Insert the cable CC Fig 2 8 through the slot in the cable bracket and position the flat side of the threaded assembly next to the flat side of the hole Slide the hex nut DD up the cable and tighten it securely 3 Fasten the reverse clutch cable to the left s...

Page 9: ...mage will result if the engine is run with out oil 1 Refer to the separate Engine Owner s Manual for engine oil specifications and capacities 2 With the tiller on level ground move the Depth Regulator Lever FF Fig 2 10 up or down until the engine is level 3 Add motor oil as described in the En gine Owner s Manual 4 Move the Depth Regulator Lever all the way down until the highest notch is en gaged...

Page 10: ...ch Control Model 644A is en gaged Use the FREEWHEEL mode only when the engine is not running In FREEWHEEL the wheel drive pins are placed only through the holes in the wheel shaft not the wheel hubs thus allowing the wheels to turn freely when you manually move the tiller To place the wheels in WHEEL DRIVE or FREEWHEEL 1 Stop engine disconnect spark plug wire from spark plug and allow engine to co...

Page 11: ...nob F Figure 3 4 out The wheels and tines will rotate in a reverse direction 4 Release the control knob to disengage stop the wheels and tines the engine will continue to run DEPTH REGULATOR LEVER This lever G Figure 3 5 controls the till ing depth of the tines Pull the lever back and slide it up or down to engage the notched height settings The travel position highest notch raises the tines appro...

Page 12: ...ng to the directions in the separate Engine Owner s Manual Follow all instructions and safety rules carefully 8 Attach spark plug wire to spark plug Starting the Engine The following steps describe how to start and stop the engine WARNING Do not attempt to engage the tines or wheels until you have read all of the operating instructions in this Section Also review the safety rules in Section 1 Safe...

Page 13: ...n on the handlebars to try to make the tiller till more deeply This prevents the wheels from holding the tiller back and can allow the tines to rapidly propel the tiller forward which could result in loss of control property damage or personal injury 5 For reverse motion of the wheels and tines Model 644A only a Look behind and exercise caution when operating in reverse Do not till while in revers...

Page 14: ...hrottle lever at a speed to give the engine adequate power and yet allow it to operate at the slowest possible speed at least until you have achieved the maximum tilling depth you desire Faster engine speeds may be desirable when making final passes through the seedbed or when cultivating Selection of the correct engine speed in relation to the tilling depth will ensure a sufficient power level to...

Page 15: ... debris It may be necessary to remove the debris by hand a pocket knife will help you to cut away the material Be sure to stop the engine and disconnect the spark plug wire before clearing the tines by hand WARNING Before clearing the tines by hand stop the engine allow all moving parts to stop and disconnect the spark plug wire Remove the ignition key on electric start models Failure to follow th...

Page 16: ...wo or more people are needed to do this The ramps must be strong enough to support the combined weight of the tiller and any handlers The ramps should pro vide good traction to prevent slipping they should have side rails to guide the tiller along the ramps and they should have a locking device to secure them to the vehicle The handlers should wear sturdy footwear that will help to prevent slippin...

Page 17: ...f a cover is leaking check for loose screws If the screws are tight a new gasket or oil seal may be required If the leak is from around a shaft and oil seal the oil seal probably needs to be replaced See your authorized dealer or contact the factory for service or advice IMPORTANT Never operate the tiller if the transmission is low on oil Check the oil level after every 30 hours of operation and w...

Page 18: ...of the transmission 6 Reinstall the wheel 7 Install a new gasket do not reuse old gasket and reinstall the transmission cov er 8 Refill the transmission using GL 4 gear oil SAE 85W 140 or SAE 140 9 Refill the engine with motor oil and re plenish the fuel tank with gasoline BOLO TINES The bolo tines will wear with use and should be inspected at the beginning of each tilling season and after every 3...

Page 19: ...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 turn the slotted screw lo cated inside the spring clockwise viewed from operator s position to increase ten sion on the spring Turn the screw counter clockwise to decrease tension Once adjusted reattach the spring to the For ward Clutch Bail e RepeatSteps2and3tore measurethe ...

Page 20: ...the bracket 7 Measure the gap by repeating Step 3 Readjust as needed by repeating Steps 5 and 6 8 Reinstall the belt cover Replacement Belt Information If the drive belt needs to be replaced see your local authorized dealer or refer to the Parts List for ordering information Use only a factory authorized belt as an over the counter belt may not perform satis factorily The procedure requires averag...

Page 21: ...s on the machine the governor controls the maximum safe operating speed to protect the engine and all moving parts from damage caused by overspeed Authorized service shall be sought if a problem exists CARBURETOR GOVERNOR CONTROL ADJUSTMENTS The carburetor was adjusted at the factory for best operating speed Refer to the En gine Owner s Manual for any adjustment information or see your authorized ...

Page 22: ... oil level see Engine Owner s Manual Engine does not shut off 1 Misadjusted throttle control or ignition switch 1 See Engine Owner s Manual or Engine Service Dealer Wheels and Tines will not turn 1 Improper use of controls 1 Review Sections 3 and 4 2 Worn broken or misadjusted drive belt s 2 See Checking Drive Belt Tension Section 5 3 Internal transmission wear or damage 3 Contact local dealer or ...

Page 23: ...119 Lock Washer 5 16 10 GW 55013 1 Hood Bracket Left Hand 11 GW 55013 2 Hood Bracket Right Hand 12 GW 55015 Drag Bar 13 GW 55018 Depth Regulator Lever 14 686 04043 Tine Hood Assembly A 686 04041 Tine Hood Assembly B 15 GW 55088 Bushing 16 GW 9384 Spring Depth Regulator 17 GW 9534 Spacer 18 710 04048 Hex Hd Flange Screw 5 16 18 x 1 19 618 04254 Transmission Assembly A 618 04046 Transmission Assembl...

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 ...

Page 25: ... x 1 2 6 710 3008 Screw Hex 5 16 18 x 3 4 7 712 3009 Hex Lock Nut 5 16 18 8 786 04188 Handlebar Support 9 GW 55043 Lower Handlebar 10 786 04200 Panel 11 GW 55044 Tab Conduit Mount 12 GW 9855 Screw 10 24 x 2 13 725 0157 Cable Tie 14 736 3050 Flat Washer 3 8 15 732 04040 Bracket Reverse Clutch Cable B 16 732 04185 Spring Forward Clutch 17 710 0106 Hex Hd Screw 1 4 20 x 1 1 4 18 710 0216 Screw Hex 3 ...

Page 26: ... 5 4 6 6 8 8 9 10 10 12 3 14 13 11 7 Included with transmission when purchased as an assembly only Remove and discard when installing the transmission on tiller REF NO PART NO DESCRIPTION 1 GW 9727 Plug Transmission Oil Fill 2 710 04049 Hex Hd Flange Screw 5 16 18 x 5 8 Gr 5 3 736 0119 Lock Washer 5 16 4 1918377 Rear Cover Transmission 5 1916641 Front Cover Transmission 6 GW 50032 Gasket Housing C...

Page 27: ...66 2 Shim 0 030 thick GW 1166 3 Shim 0 015 thick GW 1166 4 Shim 0 010 thick GW 1166 5 Shim 0 005 thick 4 GW 1086 Bronze Bushing 5 711 04088 Wheel Shaft A 711 04092 Wheel Shaft B 6 GW 9305 Key Hi Pro 1 4 x 1 7 GW 1132 2 Spacer 8 1904278 Worm Gear Wheel Shaft 9 711 04078 Tiller Shaft 10 GW 1104 Woodruff Key 11 1916542 Worm Gear Tiller Shaft 1 2 3 4 7 7 4 3 2 FRONT 9 5 6 10 11 8 A For Model 640C B Fo...

Page 28: ...LS 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 ...

Page 29: ...4 x 1 B 20 710 0237 Hex Hd Screw 5 16 24 x 5 8 21 710 0376 Hex Hd Screw 5 16 18 x 1 22 710 04049 Hex Hd Screw 5 16 18 x 5 8 23 710 0347 Hex Hd Screw 3 8 16 x 1 3 4 24 710 0599 Screw Self Tapping 1 4 20 x 1 2 25 710 3103 Hex Hd Screw 5 16 18 x 2 B 26 712 3000 Lock Nut 3 8 16 27 712 3009 Lock Nut 5 16 18 28 736 0119 Lock Washer 5 16 29 750 0535 Spacer 380 ID x 625 OD x 21 30 736 3090 Flat Washer 31 ...

Page 30: ...ht Side B 734 04162 Wheel Tire Ass y Left Side Only A 8 734 04161 Wheel Tire Ass y Right Side Only A 9 GW 9380 Clevis Pin 312 x 1 3 4 10 GW 9338 Hair Pin Cotter GW 1901 Bolo Tine Replacement Set Incl eight right hand tines eight left hand tines and required hardware A B 9 9 10 7 8 3 2 TINE SHAFT 1 4 5 1 3 3 5 7 2 A For Model 640C B For Model 644A Hold Tines With Blunt End Toward You RIGHT HAND TIN...

Page 31: ...31 NOTES ...

Page 32: ... commercial institutional industrial rental or demonstrator purposes the warranty COMMERCIAL on the tiller is limited in duration to 90 days from the date of purchase USE WARRANTY This warranty does not apply to parts that have been damaged by accident alteration misuse abuse neglect improper maintenance vandalism theft fire water or damage because of peril or other natural disaster HOW TO OBTAIN ...

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