Troy-Bilt 643C Tuffy/Bronco, 645A Super Bronco manual Models 643C, 643B & 645A

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	REF	PART NO.	DESCRIPTION
	NO.	PART NO.	DESCRIPTION
	NO.
	1	736-0159	Flat Washer, 5/16
	2	756-04198	Pulley, Engine Drive
	3	656-04023	Transmission Pulley (A)
		656-04005	Transmission Pulley (B) (C)
	4	756-04169	Pulley, Reverse Idler (B) (C)
	5	786-04095	Guard, Belts/Pulleys
	6	754-04090	Forward Drive Belt
	7	754-04091	Reverse Drive Belt (B) (C)
	8	731-05268	Belt Cover
	9	732-04289	Reverse Return Spring (B) (C)
	10	732-04081	Belt Guide (B) (C)
	11	732-04079	Belt Guide
	12	786-04068	Engine Bracket, Left
	13	786-04069	Engine Bracket, Right
	14	786-04070	Bracket, Belt Cover
	15	748-04087	Shoulder Washer
	16	786-04276	Reverse Idler Arm (B) (C)
	17	786-04275	Forward Idler Lever
	18	710-0672	Hex Hd. Screw, 5/16-24 x 1.25 (A)
		710-0117	Hex Hd. Screw, 5/16-24 x 1 (B) (C)
	19	710-0237	Hex Hd. Screw, 5/16-24 x 5⁄8
	20	710-0376	Hex Hd. Screw, 5/16-18 x 1
	21	710-04049	Hex Hd. Screw, 5/16-18 x 5/8
	22	710-0347	Hex Hd. Screw, 3/8-16 x 1-3/4 (A)
		710-0520	Hex Hd. Screw, 3/8-16 x 1.50 (B) (C)
	23	710-0599	Screw, Self-Tapping, 1/4-20 x 1/2
	24	710-3103	Hex Hd. Screw, 5/16-18 x 2 (B) (C)
	25	712-3000	Lock Nut, 3/8-16
	26	712-3009	Lock Nut, 5/16-18 (B) (C)

MODELS 643C, 643B & 645A

	REF	PART NO.	DESCRIPTION
	NO.	PART NO.	DESCRIPTION
	NO.

	27	736-0119	Lock Washer, 5/16 (A)
	28	750-0535	Spacer, .380 ID x .625 OD x .21 (A)
		736-3050	Flat Washer .406 x .812 x .051 (B) (C)
	29	736-3090	Flat Washer
	30	736-0452	Bell Washer
	31	710-0459A	Hex Hd. Screw, 3/8-24 x 1.50, GR5
	32	736-04181	Support Washer
	33	732-04085	Forward Return Spring
	34	786-04107	Bracket, Cable Mounting
	35	756-04170	Forward Idler Pulley
	36	714-0105	Key, 3/16" x 1"
	37	736-3078	Flat Washer
	38	736-04193	Belleville Washer
	39	710-0805	Hex Screw, 5/16-18 x 1.50 Gr5 (A) (B)
		710-0395	Hex Screw, 5/16-18 x 2-1/4, Gr5 (C)
	40	712-04063	Nut, Hex Lock, 5/16-18
	41	750-0258	Spacer, Shoulder (A)
	42	736-0315	Washer, Flat, .75 x 1.5 x .125 (A)
		736-04192	Flat Washer .786 x 1.000 x .031 (B) (C)
	43	736-0242	Bell Washer
	44	749-04193	Bumper (C)
	45	726-0201	Nut, Speed, 5/16-18 (C)
	46	714-0143	Klik Pin
	47	734-04188	Complete Wheel Assembly 10 x 2.75 (A)
	48	634-04232	Complete Wheel Assembly 13 x 5 x 6 (B) (C)
		634-04218	Rim Assembly (B) (C)
		734-0255	Air Valve (B) (C)
		734-04163	Tire (B) (C)

(A)For Model 643C

(B)For Model 643B

(C)For Model 645A

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Contents Operator’s Manual Customer Support Table of ContentsFinding Model Number Do not put hands or feet near or under rotating parts Safety Alert SymbolKeep children and pets away Refer to the Maintenance sectionsStarting the engine or engaging Use slower engine speedsTo Avoid Serious Injury Operating SymbolsAssembly Steps AssemblyIntroduction Inspect UnitUse the handlebar to roll the tiller to a flat area Install Forward Clutch CableWith the Forward Clutch Bail Y, Fig While preventing the cable adjuster from turningOperation SafetyCheck all nuts and screws for tightness From wheel drive shaft B Ature package to identify the controls on your engineFreewheel To adjust the handlebars Travel Position Shallow SettingsTo operate the Forward Clutch Bail Stop all tiller motion by releasing the Forward Clutch BailIntroduction BREAK-IN Operation Following steps describe how to start and stop the engineStarting and Stopping Change engine oilOperating the Tiller For forward motion of the wheels and power to the tinesStopping the Engine and Tiller To move the Model 643C in reverse for short distancesTilling Tips & Techniques Tilling On Slopes Tilling Tips & Techniques CON’TClearing the Tines Read the following recommendations before tilling on slopesTerrace Gardening Loading and Unloading the TillerTiller Lubrication Transmission Gear OIL ServiceCheck Hardware Check Tire PressureRemoving⁄Installing a Tine Assembly Removing⁄Installing a Single TineBolo Tines Tine InspectionTo Check Forward Belt Tension Checking and AdjustingReplacement Belt Information Engine Cleaning AIR Cleaner Service Engine OIL Service Forward Clutch Bail AdjustmentModels 643B & 645A only To Check Reverse Belt TensionSpark Arrester Screen Service Spark Plug ServiceOFF-SEASON Storage To Change the Engine OilProblem Possible Cause Correction TroubleshootingPage Models 643C, 643B & 645A Description Models 643C, 643B & 645AGW-1224-3 Front Model 643C Models 643C, 643B & 645A Page Page TROY-BILT Tiller Lifetime Limited Warranty