Troy-Bilt LLC, P.O. BOX 361131 CLEVELAND, OHIO
Operator’s Manual
Rear-tine Tiller Models
643C, 643D Tuffy / Bronco CRT 643B, 645A Super BroncoTM
CUSTOMER SUPPORT
TABLE OF CONTENTS
Content
FINDING MODEL NUMBER
Preparation
SECTION 1 SAFETY
Safety Alert Symbol
Training
c. Use slower engine speeds
Maintenance and Storage
TO AVOID SERIOUS INJURY
Operating Symbols
Decals
maybeusedonthetillerandengine
Hardware bag contents
SECTION 2 ASSEMBLY
Loose Parts List
ASSEMBLY STEPS
Fig. 2-4 Installing forward clutch cable bracket and cable
STEP 4 INSTALL FORWARD CLUTCH CABLE
D G F E
M M N
Flat Side
X while preventing the cable adjuster from turning
STEP 8 CHECK HARDWARE
Section 3 Features and Controls
STEP 6 CHECK TRANSMISSION OIL LEVEL
STEP 7 ADD MOTOR OIL
INTRODUCTION
SECTION 3 FEATURES AND CONTROLS
WHEEL DRIVE PINS
WARNING Before
FORWARD CLUTCH BAIL
HANDLEBAR HEIGHT ADJUSTMENT
Settings
To adjust the handlebars
STARTING AND STOPPING
Pre-Start Checklist
1. Complete the Pre-Start Checklist on this page
BREAK-IN OPERATION
Stopping the Tiller and Engine
OPERATING THE TILLER
Stopping the Engine and Tiller
Avoid Making Footprints
TILLING TIPS & TECHNIQUES
Tilling Depths
Let the Tiller Do the Work
Clearing the Tines
TILLING TIPS & TECHNIQUES CON’T
Tilling On Slopes
WARNING Do not
TILLING TIPS & TECHNIQUES CON’T
LOADING AND UNLOADING THE TILLER
Terrace Gardening continued
PROCEDURE
SECTION 5 MAINTENANCE
TRANSMISSION GEAR OIL SERVICE
MAINTENANCE SCHEDULE
B B A
B. Removing⁄Installing a Single Tine
C. Removing⁄Installing a Tine Assembly
BOLO TINES
FORWARD DRIVE BELT TENSION
CHECKING AND ADJUSTING
Replacement Belt Information
FORWARD
ENGINE OIL SERVICE
FORWARD CLUTCH BAIL ADJUSTMENT
ENGINE CLEANING
AIR CLEANER SERVICE
CARBURETOR/GOVERNOR CONTROL ADJUSTMENTS
SPARK PLUG SERVICE
SPARK ARRESTER SCREEN SERVICE
THROTTLE LEVER ADJUSTMENT
CORRECTION
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
Page
MODELS 643B
643C, 643D 645A
required hardware. A B C
MODELS 643B, 643C, 643D & 645A
DESCRIPTION
DESCRIPTION
DESCRIPTION
Remove and discard when installing the transmission on tiller
MODELS 643B, 643C, 643D & 645A
DESCRIPTION
DESCRIPTION
MODELS 643B, 643C, 643D & 645A
FRONT
MODEL 643C
MODELS 643B, 643C, 643D & 645A
MODEL 643B & 643D
DESCRIPTION
Complete Wheel Assembly 10 x 2.75 A
Complete Wheel Assembly 13 x 5 x 6 C
MODELS 643B, 643C, 643D & 645A
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TROY-BILT TILLER LIFETIME LIMITED WARRANTY
TROY-BILT LLC, P.O. Box 361131, Cleveland, Ohio