Troy-Bilt 21A-643B766 Bronco RotoTillers OEM Replacement Parts From eReplacementParts.com

Find Troy-Bilt 21A-643B766 (2006) Parts By Symptom

Choose a symptom to view parts that fix it.

Won't start

26%

Leaks oil

17%

Engine rotates but tines don't

16%

Hard to start

11%

Tines stall under load

Vibrates excessively

One tine / one side doesn't rotate

Engine lacks power

Starts, runs for a while, then dies

Blows black smoke from exhaust

Engine RPM's surge up and down

Show All Symptoms

Find Troy-Bilt 21A-643B766 (2006) Parts by Symptom

Popular Parts for Troy-Bilt 21A-643B766 (2006)

Nut-flglk 5/16-18

4 Reviews

In Stock

$4.10

Screw-hex Wash Sf

Min qty 2 required

9 Reviews

In Stock

$4.44 ea.

Nut-flange Lk.nylo

6 Reviews

In Stock

$4.24

Belt-v 3l X

44 Reviews

In Stock

$26.85

Nut-flglk

7 Reviews

In Stock

$4.19

Seal-oil

11 Reviews

In Stock

$11.04

Belt-v Fwd Drv 4

14 Reviews

In Stock

$21.43

Washer-bell .337 X

Min qty 2 required

4 Reviews

Usually ships in 7 - 12 business days

$4.32 ea.

Tine-bolo 10 Lh

In Stock

$20.88

Search within model

Questions & Answers for Troy-Bilt 21A-643B766 (2006)

Browse all Parts

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Page A

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Page F

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Showing All Parts

Page A

Hotspots

Fig #

Use 936-0159

$5.28

Part Number:736-0159

Backorder: No ETA

Note: Not Used in This Application

$5.28

Pulley-engine

$69.81

Part Number:756-04198A

Usually ships in 7 - 12 business days

$69.81

Pulley Asm-trans Obsolete - Not Available

$83.11

Part Number:656-04023A

Discontinued

Pulley Asm-trans Tiller Obsolete - Not Available

$68.13

Part Number:656-04005A

Discontinued

Pulley-rev Idler

$25.62

Part Number:756-04169

In Stock

$25.62

Guard-trns Pulley Obsolete - Not Available

$33.10

Part Number:786-04095-0637

Discontinued

Belt-v Fwd Drv 4

$21.43

Part Number:954-04090

In Stock

Note: Length: 12 inches Width: 1/2 inch

$21.43

Belt-v Rev Drv 3

$20.31

Part Number:954-04091

In Stock

Note: (Reverse)(Closer to the Engine, V-Side Out)

$20.31

Cover-belt

$49.16

Part Number:731-05268

Usually ships in 7 - 12 business days

$49.16

Spring-rev Return Obsolete - Not Available

$5.48

Part Number:1916724

Discontinued

A10

Guide-belt

$12.66

Part Number:732-04081

In Stock

$12.66

A11

Guide-forward Belt Obsolete - Not Available

$8.99

Part Number:1916726

Discontinued

A12

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 1916794001 OEM replacement Use 786-04068

Use 786-04068 Obsolete - Not Available

$13.60

Part Number:1916794001

Discontinued

A13

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 1916795001 OEM replacement 786-04069 Bracket-

786-04069 Bracket- Obsolete - Not Available

$14.23

Part Number:1916795001

Discontinued

A14

Bracket:belt Cover Obsolete - Not Available

$46.61

Part Number:786-04070-0637

Discontinued

A15

Spacer-pivot Idler

$8.07

Part Number:748-04087A

In Stock

$8.07

A16

Idler Arm-reverse

$20.59

Part Number:786-04276

Usually ships in 7 - 12 business days

$20.59

A17

Arm:idler:forward

$44.91

Part Number:786-04275-0637

In Stock

$44.91

A18

Screw-hex 5/16-24

$5.48

Part Number:710-0672

Usually ships in 7 - 12 business days

Note: For 10 & 11 Hp

$5.48

A18

Screw-hex Special

$4.44

Part Number:710-0888

In Stock

Note: (Special)

$4.44

A19

Screw-hex 5/16-24

$5.60

Part Number:710-0237

In Stock

Note: Tightening Torque: 150-300 In. Lbs.

$5.60

A20

Hex Bolt 5/16-18 X .1in. Lg. (

$4.21

Part Number:710-0376

In Stock

Note: for Faster Service Obtain Standard Nuts, Bolts and Washers Locally. if These Items Cannot Be Obtained Locally, Order by Part Num

$4.21

A21

Screw-hex Flange 5

$5.86

Part Number:710-04049

In Stock

$5.86

A22

Screw-hex 3/8-16 X

$5.06

Part Number:710-0347

In Stock

Note: Purchase Locally

$5.06

A22

Screw-hex 3/8-16 X

$5.60

Part Number:710-0520

In Stock

Note: Attaching the Chute Crank Support Tube.

$5.60

A23

Screw-hex Wash Sf

Minimum Quantity of 2 Required

$4.44

Part Number:710-0599

In Stock

Note: Not Used on Units With Electric P.T.O.

$4.44

A24

Bolt-5/16-18 X 2.0

$4.63

Part Number:710-3103

In Stock

Note: for Faster Service Obtain Standard Nuts, Bolts and Washers Locally. if Items Cannot Be Obtained Locally, Order by Part Number an

$4.63

A25

Nut, Hexlck, 3/8-16, Cntrlck

$4.49

Part Number:712-3000

Usually ships in 7 - 12 business days

$4.49

A26

Hex L-nut 5/16-18 Thd.

$6.03

Part Number:712-3009

Usually ships in 7 - 12 business days

$6.03

A27

Washer-lock 5/16

Minimum Quantity of 2 Required

$4.95

Part Number:936-0119

In Stock

Note: for Faster Service Obtain Standard Nuts, Bolts and Washers Locally. if Items Cannot Be Obtained Locally, Order by Part Number an

$4.95

A28

Spacer-.380 Id X .

$5.57

Part Number:950-0535

Usually ships in 7 - 12 business days

Note: Model Lc-40 Only

$5.57

A28

Washer-fl

$4.49

Part Number:736-3050

In Stock

$4.49

A29

Washer-fl

$8.24

Part Number:736-3090

In Stock

Note: Part of Motor, Switch & Cord Ass'y. Comp. (Ref. 49)

$8.24

A30

Use 936-0452

$4.66

Part Number:736-0452

In Stock

$4.66

A31

Screw-hex 3/8-24 X

$7.49

Part Number:710-0459A

In Stock

Note: Special

$7.49

A32

Washer

$8.45

Part Number:GW-50027

In Stock

$8.45

A33

Spring-return

$17.66

Part Number:732-04085

In Stock

$17.66

A34

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 786-04107 OEM replacement Bracket:cable Mt

Bracket:cable Mt Obsolete - Not Available

$4.99

Part Number:786-04107

Discontinued

A35

Pulley-idler

$44.53

Part Number:756-04170

In Stock

$44.53

A36

Key-sq 3/16 X 1.00

$3.99

Part Number:914-0105

In Stock

Note: Honda Engine

$3.99

A37

Washer-fl-344x1.00

$4.55

Part Number:736-3078

Usually ships in 7 - 12 business days

Note: Code: N

$4.55

A38

Washer-belvl .8

$8.45

Part Number:736-04193

In Stock

$8.45

A39

Belt-v 3l X

$26.85

Part Number:954-04032B

In Stock

$26.85

A39

Screw-hex 5/16-18

$5.83

Part Number:710-0395

In Stock

Note: Purchase Locally

$5.83

A40

Nut-flglk 5/16-18

$4.10

Part Number:712-04063

In Stock

Note: Use With 618-04378a Transmission, Double "D" Input Shaft

$4.10

A41

Spacer

$14.22

Part Number:750-0258

Backorder: No ETA

Note: (Used W/46\\\\

$14.22

A42

Washer-fl

$8.45

Part Number:736-0315

Usually ships in 7 - 12 business days

$8.45

A42

Washer:flat

$8.45

Part Number:736-04192

In Stock

$8.45

A43

Washer-bell .337 X

Minimum Quantity of 2 Required

$4.32

Part Number:736-0242

Usually ships in 7 - 12 business days

Note: Not Used in This Application

$4.32

A44

Bumper

$54.84

Part Number:749-04193-0637

In Stock

$54.84

A45

Push Cap

$8.55

Part Number:726-0201

In Stock

Note: (Not Used on This Model)

$8.55

A46

Pin-klik

$6.53

Part Number:714-0143A

In Stock

Note: Model No.(S) E633e, E6b3h

$6.53

A47

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 734-04188 OEM replacement Wheel:compl:10.0

Wheel:compl:10.0 Obsolete - Not Available

$131.96

Part Number:734-04188

Discontinued

A48

Wheel:compl:13 X 5

$215.36

Part Number:934-04232

Usually ships in 7 - 12 business days

$215.36

A48

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 634-04218 OEM replacement Rim Only (6.0 X 3.25)

Rim Only (6.0 X 3.25) Obsolete - Not Available

$2.99

Part Number:634-04218

Discontinued

A48

Valve-tubeless Air

$4.41

Part Number:934-0255

In Stock

Note: Model No.(S) E633e, E6b3h

$4.41

A99

Screw-hex Special

$4.44

Part Number:710-0888

In Stock

Note: (Special)

$4.44

Page B

Hotspots

Fig #

Ring-retaining

$4.43

Part Number:716-04102

In Stock

$4.43

Bearing-roller-3/4

$59.50

Part Number:941-0107

In Stock

Note: (Service Only)

$59.50

Washer-flat .765 X

$5.50

Part Number:736-04304

In Stock

$5.50

Shaft-drive

$212.83

Part Number:911-04110

Usually ships in 7 - 12 business days

Note: Use As Required To Obtain Between .005" And .015" Allowable End-Play.

$212.83

Washer-flat 1.50 X

$4.43

Part Number:736-04308

In Stock

Note: Washers Used to Obtain .005 to .015 Allowable End Play on Drive Shaft - Use As Required To Obtain Between .005" And .015" Allowable End-Play.

$4.43

Washer-flat 1.50 X

$5.48

Part Number:736-04307

In Stock

Note: Washers Used to Obtain .005 to .015 Allowable End Play on Drive Shaft - Use As Required To Obtain Between .005" And .015" Allowable End-Play.

$5.48

Washer-flat 1.50 X

$4.43

Part Number:736-04306

In Stock

Note: Washers Used to Obtain .005 to .015 Allowable End Play on Drive Shaft - Use As Required To Obtain Between .005" And .015" Allowable End-Play.

$4.43

Washer-flat 1.50 X

$4.05

Part Number:736-04305

In Stock

Note: (the Flat Washers Listed Are Used as Required to Obtain .005 to .015" Allowable End Play on the Drive Shaft.) - Incl. The Following Shims: Two 2 #1224-1, Two 2 1224-2 And One 1 #1224-4

$4.05

Shim Set

$19.40

Part Number:GW-1325C

Usually ships in 7 - 12 business days

$19.40

Page C

Hotspots

Fig #

Shield Asm-tine Br

$111.48

Part Number:686-04076A-0638

Usually ships in 7 - 12 business days

$111.48

Screw-hex 5/16-18

$5.83

Part Number:710-0395

In Stock

Note: Purchase Locally

$5.83

Screw-hex 1/4-20 X

$4.21

Part Number:710-0597

Usually ships in 7 - 12 business days

Note: for Faster Service Obtain Standard Nuts, Bolts and Washers Locally. if These Items Cannot Be Obtained Locally, Order by Part Num

$4.21

Screw-hex Wash Sf

Minimum Quantity of 2 Required

$4.44

Part Number:710-0599

In Stock

Note: Not Used on Units With Electric P.T.O.

$4.44

Screw-hex 5/16-18

$8.55

Part Number:710-0874

Backorder: No ETA

Note: If Equipped

$8.55

Hex Bolt 5/16-18 X .75

$4.33

Part Number:710-3008

In Stock

Note: Models With Electric Pto Only

$4.33

Nut-flglk 5/16-18

$4.10

Part Number:712-04063

In Stock

Note: Use With 618-04378a Transmission, Double "D" Input Shaft

$4.10

Nut-flglk

$4.19

Part Number:712-04064

In Stock

Note: Models Without Clutch Lock

$4.19

Pin-spring Spir 1/

$6.22

Part Number:715-0108

Usually ships in 7 - 12 business days

$6.22

C10

Spring:torsion

$5.48

Part Number:732-04320

In Stock

$5.48

C11

Fl-wash. .34

$6.03

Part Number:736-0275

Usually ships in 7 - 12 business days

$6.03

C12

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 750-04149 OEM replacement Spacer:split

Spacer:split Obsolete - Not Available

$13.43

Part Number:750-04149

Discontinued

C13

Bushing Obsolete - Not Available

$3.99

Part Number:GW-55088

Discontinued

C14

Spacer:split

$8.55

Part Number:750-04556

Usually ships in 7 - 12 business days

$8.55

C15

Arm:rev:stop

$25.91

Part Number:786-04092

Usually ships in 7 - 12 business days

Note: *Choose Color When Ordering*

$25.91

C16

Bracket:supt

$26.75

Part Number:786-04098

Usually ships in 7 - 12 business days

$26.75

C17

Bar:depth Drag

$33.68

Part Number:786-04104

Usually ships in 7 - 12 business days

Note: *Choose Color When Ordering*

$33.68

C18

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 786-04191-0637 OEM replacement Bracket-hood Stop

Bracket-hood Stop Obsolete - Not Available

$19.03

Part Number:786-04191-0637

Discontinued

C19

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 786-04290 OEM replacement Bracket:hood Lh

Bracket:hood Lh Obsolete - Not Available

$23.34

Part Number:786-04290

Discontinued

C20

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 786-04291 OEM replacement Bracket:hood Rh

Bracket:hood Rh Obsolete - Not Available

$23.34

Part Number:786-04291

Discontinued

C22

Hex Bolt 1/4-20 X 1.25 Lg.

$3.99

Part Number:710-0106

In Stock

$3.99

C23

Screw-solt.h.10-24 Obsolete - Not Available

$4.99

Part Number:710-04163

Discontinued

C24

Hex L-nut 5/16-18 Thd.

$6.03

Part Number:712-3009

Usually ships in 7 - 12 business days

$6.03

C25

Hex Nut #10-24 Thd.

$3.99

Part Number:712-0121

In Stock

$3.99

C26

Use 912-0291

$5.60

Part Number:712-0291

Usually ships in 7 - 12 business days

Note: (Optional)

$5.60

C27

Spring-fwrd Clutch

$8.84

Part Number:732-04185

In Stock

$8.84

C28

Cable:drive:tuffy

$40.94

Part Number:946-04208

In Stock

$40.94

C29

Cable:reverse Cont

$64.68

Part Number:946-04058

In Stock

$64.68

C30

Bail-forward Clutc

$64.50

Part Number:1916106001

Backorder: No ETA

$64.50

C31

Handle: Upper: Til Obsolete - Not Available

$109.63

Part Number:749-04084-0638

Discontinued

C32

Handle-lower Tille

$56.12

Part Number:749-04742-0638

In Stock

$56.12

C33

Tab: Conduit Mount Obsolete - Not Available

$3.99

Part Number:786-04106

Discontinued

C34

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 786-04040 OEM replacement Bracket-rev Cable

Bracket-rev Cable Obsolete - Not Available

$11.66

Part Number:786-04040

Discontinued

C35

Bracket-handle Supt

$21.97

Part Number:786-04188-0638

In Stock

$21.97

C36

Panel-handle

$28.51

Part Number:786-04200-0638

In Stock

$28.51

C37

Screw-hex 3/8-16 X

$4.53

Part Number:710-0216

Usually ships in 7 - 12 business days

Note: for Faster Service Obtain Standard Nuts, Bolts and Washers Locally. if These Items Cannot Be Obtained Locally, Order by Part Num

$4.53

C38

Belt-v 3l X

$26.85

Part Number:954-04032B

In Stock

$26.85

C39

Nut, Hexlck, 3/8-16, Cntrlck

$4.49

Part Number:712-3000

Usually ships in 7 - 12 business days

$4.49

C40

Washer-lock 5/16

Minimum Quantity of 2 Required

$4.95

Part Number:936-0119

In Stock

Note: for Faster Service Obtain Standard Nuts, Bolts and Washers Locally. if Items Cannot Be Obtained Locally, Order by Part Number an

$4.95

C41

Tie-cable 7

$3.99

Part Number:725-0157

In Stock

Note: (W/ Heated Grips)

$3.99

C42

Washer-fl

$4.49

Part Number:736-3050

In Stock

$4.49

C43

Nut-flange Lk.nylo

$4.24

Part Number:712-04065

In Stock

Note: (Not Shown)

$4.24

C44

Screw-hex 3/8-16 X

$5.06

Part Number:710-0347

In Stock

Note: Purchase Locally

$5.06

C45

Screw-hex 3/8-16 X

$4.36

Part Number:710-0514

In Stock

Note: (Optional)

$4.36

C46

Screw-hhflg 5/16-

$4.82

Part Number:710-04048

In Stock

Note: See Tine Chart

$4.82

C47

Tine-bolo 10 Rh

$21.10

Part Number:742-04226-0637

In Stock

Note: See Tine Chart

$21.10

C48

Tine-bolo 10 Lh

$20.88

Part Number:742-04227-0637

In Stock

$20.88

C49

Holder Asm:tine:tu

$55.08

Part Number:686-04066

Usually ships in 7 - 12 business days

$55.08

C49

Tine Holder

$51.98

Part Number:686-05008-0637

In Stock

Note: Incl. Eight Right-Hand Tines, Eight Left-Hand Tines And Required Hardware.

$51.98

Tines-bolo Set Of Obsolete - Not Available

$249.62

Part Number:GW-1901

Discontinued

Note: Tecumseh Engine

Page D

Hotspots

Fig #

Resistor Spark Plug

$4.99

Part Number:34645

In Stock

Note: Model 645A Honda Only

$4.99

Splg:1st Fire:rp C Obsolete - Not Available

$4.99

Part Number:FF-22

Discontinued

Note: Tecumseh Engine

Pre Filter

$6.55

Part Number:36634

In Stock

Note: Tecumseh Engine

$6.55

Air Filter

$10.00

Part Number:30-740

In Stock

Note: Model 645A Honda Only

$10.00

Air Cleaner Element

$6.11

Part Number:17211-ZL8-023

In Stock

Note: Honda Engine

$6.11

Belt-v Fwd Drv 4

$21.43

Part Number:954-04090

In Stock

Note: Length: 12 inches Width: 1/2 inch - Model 643B & 645A Only

$21.43

Belt-v Rev Drv 3

$20.31

Part Number:954-04091

In Stock

Note: (Reverse)(Closer to the Engine, V-Side Out)

$20.31

Pulley-idler

$44.53

Part Number:756-04170

In Stock

$44.53

Cable:drive:tuffy

$40.94

Part Number:946-04208

In Stock

Note: Model 643B & 645A Only

$40.94

Cable:reverse Cont

$64.68

Part Number:946-04058

In Stock

Note: See Tine Chart

$64.68

Tine-bolo 10 Lh

$20.88

Part Number:742-04227-0637

In Stock

Note: See Tine Chart

$20.88

Tine-bolo 10 Rh

$21.10

Part Number:742-04226-0637

In Stock

Note: Incl. All Hardware

$21.10

Tines-bolo Set Of Obsolete - Not Available

$249.62

Part Number:GW-1901

Discontinued

Note: Model 643C Only

Holder Asm:tine:tu

$55.08

Part Number:686-04066

Usually ships in 7 - 12 business days

Note: Model 643B & 645A Only

$55.08

Tine Holder

$51.98

Part Number:686-05008-0637

In Stock

Note: Model 643C Only

$51.98

Wheel:compl:10.0 Obsolete - Not Available

$131.96

Part Number:734-04188

Discontinued

Note: Model 643B & 645A Only

Wheel:compl:13 X 5

$215.36

Part Number:934-04232

Usually ships in 7 - 12 business days

$215.36

Page E

Hotspots

Fig #

Tine-bolo 10 Rh

$21.10

Part Number:742-04226-0637

In Stock

$21.10

Tine-bolo 10 Lh

$20.88

Part Number:742-04227-0637

In Stock

$20.88

Tine-bolo 12 Rh

$33.81

Part Number:742-04224-0637

In Stock

$33.81

Tine-bolo 12 Lh

$33.79

Part Number:742-04223-0637

In Stock

$33.79

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 1901118A OEM replacement Kit-tine Cast Iron

Kit-tine Cast Iron Obsolete - Not Available

$297.53

Part Number:1901118A

Discontinued

Tines-bolo Set Of Obsolete - Not Available

$249.62

Part Number:GW-1901

Discontinued

Page F

Hotspots

Fig #

Plug-pipe 3/8 Npt

$8.55

Part Number:737-04202

Usually ships in 7 - 12 business days

$8.55

Screw-hex Flange 5

$5.86

Part Number:710-04049

In Stock

$5.86

Washer-lock 5/16

Minimum Quantity of 2 Required

$4.95

Part Number:936-0119

In Stock

Note: for Faster Service Obtain Standard Nuts, Bolts and Washers Locally. if Items Cannot Be Obtained Locally, Order by Part Number an

$4.95

Cover-trans Rear 1 Obsolete - Not Available

$10.46

Part Number:1916109001

Discontinued

Cover-trans Housin

$31.10

Part Number:786-04359

Usually ships in 7 - 12 business days

$31.10

Gasket-gear Housin

$8.47

Part Number:921-04229

In Stock

$8.47

Seal-oil

$13.05

Part Number:921-04030

Usually ships in 7 - 12 business days

$13.05

Seal-oil

$11.04

Part Number:921-04031

In Stock

$11.04

Troy-Bilt 21A-643B766 (2006) Bronco RotoTiller 919-04013 OEM replacement Housing-transmissi

Housing-transmissi Obsolete - Not Available

$216.07

Part Number:919-04013

Discontinued

F10

Seal-oil

$19.98

Part Number:921-04036

In Stock

Note: Tine Shaft Seal (Not Shown) - Washers With Transmission When Purchased As An Assembly Only. Remove And Discard When Installing The Transmission On Tiller.

$19.98

F11