Troy-Bilt 21A-644A766 Bronco RotoTillers OEM Replacement Parts From eReplacementParts.com

Find Troy-Bilt 21A-644A766 (2005) Parts By Symptom

Choose a symptom to view parts that fix it.

Won't start

27%

Leaks oil

17%

Engine rotates but tines don't

17%

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

Show All Symptoms

Find Troy-Bilt 21A-644A766 (2005) Parts by Symptom

Popular Parts for Troy-Bilt 21A-644A766 (2005)

Screw-hex Wash Sf

Min qty 2 required

9 Reviews

In Stock

$4.44 ea.

Nut-flglk

7 Reviews

In Stock

$4.19

Nut-flglk 5/16-18

4 Reviews

In Stock

$4.10

Belt-v Fwd Drv 4

14 Reviews

In Stock

$21.43

Seal-oil

11 Reviews

In Stock

$11.04

Tine-bolo 10 Lh

In Stock

$17.11

Belt-v Rev Drv 3

5 Reviews

In Stock

$20.31

Washer-lock 5/16

Min qty 2 required

5 Reviews

In Stock

$4.95 ea.

Tine-bolo 10 Rh

1 Review

In Stock

$17.11

Search within model

Questions & Answers for Troy-Bilt 21A-644A766 (2005)

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Page A

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Showing All Parts

Page A

Hotspots

Fig #

Bumper

$54.84

Part Number:749-04193-0637

In Stock

Note: For Model 644A

$54.84

Screw-hex 5/16-18

$4.70

Part Number:710-0395

In Stock

Note: Purchase Locally - For Model 644A

$4.70

Push Cap

$6.92

Part Number:726-0201

In Stock

Note: (Not Used on This Model) - For Model 644A

$6.92

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

Page B

Hotspots

Fig #

Use 936-0159

$4.27

Part Number:736-0159

Backorder: No ETA

Note: Not Used in This Application - For Model 640C

$4.27

Key-sq 3/16 X 3/16

$9.19

Part Number:714-0139

Usually ships in 7 - 12 business days

Note: For Model 644A

$9.19

B2A

Use 914-0133

$4.84

Part Number:714-0133

In Stock

Note: 646f & 666g

$4.84

Pulley Asm-trans Obsolete - Not Available

$83.11

Part Number:656-04023A

Discontinued

Note: For Model 644A

B4A

Pulley Asm-trans Tiller Obsolete - Not Available

$68.13

Part Number:656-04005A

Discontinued

Note: For Model 644A

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 - For Model 644A

$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

Troy-Bilt 21A-644A766 (2005) Bronco RotoTiller 1917128 OEM replacement Cover-belt

Cover-belt Obsolete - Not Available

$23.59

Part Number:1917128

Discontinued

Note: For Model 644A

B10

Spring-rev Return Obsolete - Not Available

$5.48

Part Number:1916724

Discontinued

Note: For Model 644A

B11

Guide-belt

$10.48

Part Number:732-04081

In Stock

$10.48

B12

Guide-forward Belt Obsolete - Not Available

$8.99

Part Number:1916726

Discontinued

B13

Troy-Bilt 21A-644A766 (2005) Bronco RotoTiller 1916794001 OEM replacement Use 786-04068

Use 786-04068 Obsolete - Not Available

$13.60

Part Number:1916794001

Discontinued

B14

Troy-Bilt 21A-644A766 (2005) Bronco RotoTiller 1916795001 OEM replacement 786-04069 Bracket-

786-04069 Bracket- Obsolete - Not Available

$14.23

Part Number:1916795001

Discontinued

B15

Bracket:belt Cover Obsolete - Not Available

$46.61

Part Number:786-04070-0637

Discontinued

B16

Spacer-pivot Idler

$6.52

Part Number:748-04087A

In Stock

Note: For Model 644A

$6.52

B17

Idler Arm-reverse

$16.66

Part Number:786-04276

Usually ships in 7 - 12 business days

$16.66

B18

Arm:idler:forward

$36.35

Part Number:786-04275-0637

In Stock

Note: For Model 640C

$36.35

B19

Hex Screw, 5/16-24 X .750

$4.24

Part Number:710-0627

Backorder: No ETA

Note: for Faster Service Obtain Standard Nuts, Bolts and Washers Locally. if These Items Cannot Be Obtained Locally, Order by Part Num - For Model 644A

$4.24

B19A

Screw-hex Special

$4.44

Part Number:710-0888

Usually ships in 7 - 12 business days

Note: (Special)

$4.44

B20

Screw-hex 5/16-24

$4.53

Part Number:710-0237

In Stock

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

$4.53

B21

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

B22

Screw-hex Flange 5

$4.74

Part Number:710-04049

In Stock

$4.74

B23

Screw-hex 3/8-16 X

$5.06

Part Number:710-0347

In Stock

Note: Purchase Locally

$5.06

B24

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. - For Model 644A

$4.44

B25

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

B26

Use 912-3000

$4.49

Part Number:712-3000

In Stock

$4.49

B27

Hex L-nut 5/16-18 Thd.

$6.03

Part Number:712-3009

Usually ships in 7 - 12 business days

$6.03

B28

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

B29

Spacer-.380 Id X .

$4.49

Part Number:950-0535

Backorder: No ETA

Note: Model Lc-40 Only

$4.49

B30

Washer-fl

$6.67

Part Number:736-3090

Backorder: No ETA

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

$6.67

B31

Use 936-0452

$4.66

Part Number:736-0452

In Stock

$4.66

B32

Screw-hex 3/8-24 X

$7.55

Part Number:710-0151

In Stock

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

$7.55

B33

Washer

$6.84

Part Number:GW-50027

In Stock

$6.84

B34

Spring-return

$14.29

Part Number:732-04085

In Stock

$14.29

B36

Pulley-idler

$36.05

Part Number:756-04170

In Stock

$36.05

B37

Use Gw-9301099

$3.99

Part Number:GW-9301

In Stock

$3.99

B38

Washer-fl-344x1.00

$4.55

Part Number:736-3078

Backorder: No ETA

Note: Code: N

$4.55

B39

Washer-belvl .8

$6.84

Part Number:736-04193

In Stock

Note: For Model 640C

$6.84

B40

Screw-hex 5/16-18

$4.70

Part Number:710-0395

In Stock

Note: Purchase Locally - For Model 640C

$4.70

B41

Use 912-3010

$4.48

Part Number:712-3010

In Stock

Note: For Model 640C

$4.48

B42

Spacer

$11.51

Part Number:750-0258

Backorder: No ETA

Note: (Used W/46\\\\ - For Model 640C

$11.51

B43

Washer-fl

$6.84

Part Number:736-0315

Usually ships in 7 - 12 business days

Note: For Model 644A

$6.84

Washer:flat

$6.84

Part Number:736-04192

In Stock

$6.84

Page C

Hotspots

Fig #

Ring-retaining

$4.43

Part Number:716-04102

In Stock

$4.43

Bearing-roller-3/4

$48.16

Part Number:941-0107

Usually ships in 7 - 12 business days

Note: (Service Only)

$48.16

Washer-flat .765 X

$4.44

Part Number:736-04304

In Stock

$4.44

Shaft-drive

$172.26

Part Number:911-04110

Usually ships in 7 - 12 business days

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

$172.26

Washer-flat 1.50 X

$4.43

Part Number:736-04308

Backorder: No ETA

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

$4.43

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.

$4.43

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 #1224-1, Two 1224-2 & One #1224-4; Use As Required To Obtain Between .005" And .015" Allowable End-Play.

$4.05

Shim Set

$15.70

Part Number:GW-1325C

Usually ships in 7 - 12 business days

$15.70

Page D

Hotspots

Fig #

Cable:reverse Cont

$64.68

Part Number:946-04058

In Stock

$64.68

Handle: Upper: Til Obsolete - Not Available

$109.63

Part Number:749-04084-0638

Discontinued

Bail-forward Clutc

$52.21

Part Number:1916106001

Backorder: No ETA

$52.21

Cable:drive:tuffy

$40.94

Part Number:946-04208

In Stock

$40.94

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

Hex Bolt 5/16-18 X .75

$4.33

Part Number:710-3008

In Stock

Note: Models With Electric Pto Only

$4.33

Hex L-nut 5/16-18 Thd.

$6.03

Part Number:712-3009

Usually ships in 7 - 12 business days

$6.03

Bracket-handle Supt

$17.78

Part Number:786-04188-0638

In Stock

$17.78

Handle-lower Tille

$56.12

Part Number:749-04742-0638

In Stock

$56.12

D10

Panel-handle

$28.51

Part Number:786-04200-0638

In Stock

$28.51

D11

Tab-cable Mounting

$20.11

Part Number:GW-55044

In Stock

$20.11

D12

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

$4.99

Part Number:710-04163

Discontinued

D13

Tie-cable 7

$3.99

Part Number:725-0157

In Stock

Note: (W/ Heated Grips)

$3.99

D14

Washer-fl

$4.49

Part Number:736-3050

Backorder: No ETA

$4.49

D15

Troy-Bilt 21A-644A766 (2005) Bronco RotoTiller 786-04040 OEM replacement Bracket-rev Cable

Bracket-rev Cable Obsolete - Not Available

$11.66

Part Number:786-04040

Discontinued

D16

Spring-fwrd Clutch

$7.16

Part Number:732-04185

In Stock

$7.16

D17

Hex Bolt 1/4-20 X 1.25 Lg.

$3.99

Part Number:710-0106

In Stock

$3.99

D18

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

D20

Screw-hex Cap

$4.32

Part Number:710-0805A

In Stock

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

$4.32

D21

Hex Nut #10-24 Thd.

$3.99

Part Number:712-0121

In Stock

$3.99

D22

Use 912-0291

$4.53

Part Number:712-0291

Usually ships in 7 - 12 business days

Note: (Optional)

$4.53

D23

Use 912-3000

$4.49

Part Number:712-3000

In Stock

$4.49

D25

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

Page E

Hotspots

Fig #

Pin-spring Spir 1/

$5.04

Part Number:715-0108

Usually ships in 7 - 12 business days

$5.04

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

$6.92

Part Number:710-0874

Usually ships in 7 - 12 business days

Note: If Equipped

$6.92

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

$4.19

Part Number:712-04064

In Stock

Note: Models Without Clutch Lock

$4.19

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

Troy-Bilt 21A-644A766 (2005) Bronco RotoTiller 1916707001 OEM replacement Bracket-support Chann

Bracket-support Chann Obsolete - Not Available

$25.51

Part Number:1916707001

Discontinued

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

E10

Bracket:hood Lh

$31.82

Part Number:786-04290-0638

Usually ships in 7 - 12 business days

$31.82

E11

Bracket:hood Rh Obsolete - Not Available

$24.04

Part Number:786-04291-0638

Discontinued

E12

Bar:depth Drag

$37.06

Part Number:786-04104-0638

Usually ships in 7 - 12 business days

$37.06

E13

Bar-depth Adjust

$67.73

Part Number:786-04292A-0638

In Stock

Note: For Model 640C

$67.73

E14

Shield Asm-tine Br

$90.24

Part Number:686-04076A-0638

Backorder: No ETA

Note: For Model 644A

$90.24

E15

Bushing Obsolete - Not Available

$3.99

Part Number:GW-55088

Discontinued

E16

Spring:torsion

$4.43

Part Number:732-04320

In Stock

$4.43

E17

Spacer

$4.26

Part Number:GW-9534

In Stock

$4.26

E18

Screw-hhflg 5/16-

$4.82

Part Number:710-04048

In Stock

Note: For Model 640C

$4.82

E19

Troy-Bilt 21A-644A766 (2005) Bronco RotoTiller 918-04254 OEM replacement Transmission-tille

Transmission-tille Obsolete - Not Available

$794.16

Part Number:918-04254

Discontinued

Note: For Model 644A

E19A

Troy-Bilt 21A-644A766 (2005) Bronco RotoTiller 918-04046 OEM replacement Transmission-tille

Transmission-tille Obsolete - Not Available

$734.61

Part Number:918-04046

Discontinued

E20

Troy-Bilt 21A-644A766 (2005) Bronco RotoTiller 786-04191-0637 OEM replacement Bracket-hood Stop

Bracket-hood Stop Obsolete - Not Available

$19.03

Part Number:786-04191-0637

Discontinued

E21

Arm:rev:stop

$25.91

Part Number:786-04092

Usually ships in 7 - 12 business days

Note: *Choose Color When Ordering*

$25.91

E22

Screw-hex 5/16-18

$4.70

Part Number:710-0395

In Stock

Note: Purchase Locally

$4.70

E23

Troy-Bilt 21A-644A766 (2005) Bronco RotoTiller 1916771 OEM replacement Spacer-.462 X .328

Spacer-.462 X .328 Obsolete - Not Available

$5.69

Part Number:1916771

Discontinued

E24

Fl-wash. .34

$6.03

Part Number:736-0275

Usually ships in 7 - 12 business days

$6.03

Page F

Hotspots

Fig #

Screw-hex 3/8-16 X

$4.36

Part Number:710-0514

In Stock

Note: (Optional)

$4.36

Tine-bolo 10 Lh

$17.11

Part Number:742-04227-0637

In Stock

$17.11

Use 912-3000

$4.49

Part Number:712-3000

In Stock

$4.49

Screw-hex 3/8-16 X

$5.06

Part Number:710-0347

In Stock

Note: Purchase Locally

$5.06

Tine-bolo 10 Rh

$17.11

Part Number:742-04226-0637

In Stock

Note: For Model 640C

$17.11

Holder Asm:tine:tu

$59.21

Part Number:686-04066-0638

In Stock

Note: For Model 644A

$59.21

F6A

Tine Holder

$42.07

Part Number:686-05008-0637

In Stock

Note: For Model 644A

$42.07

Wheel Asm Complete Obsolete - Not Available

$150.00

Part Number:634-04202-0911

Discontinued

Note: For Model 640C

F7A

Tire&whl Asm Lh Obsolete - Not Available

$111.39

Part Number:734-04162

Discontinued

Note: For Model 640C

Asm-tire&whl Rh Obsolete - Not Available

$104.40

Part Number:734-04161

Discontinued

Pin:clevis

$4.19

Part Number:711-04126

In Stock

$4.19

F10

Pin:cot:int

$8.11

Part Number:714-04048

In Stock

Note: Incl. Eight Right-Hand Tines, Eight Left-Hand Tines And Required Hardware.; For Models 640C & 644A

$8.11

Tines-bolo Set Of Obsolete - Not Available

$249.62

Part Number:GW-1901

Discontinued

Page G

Hotspots

Fig #

Plug-pipe 3/8 Npt

$6.92

Part Number:737-04202

Usually ships in 7 - 12 business days

$6.92

Screw-hex Flange 5

$4.74

Part Number:710-04049

In Stock

$4.74

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

$25.17

Part Number:786-04359

Usually ships in 7 - 12 business days

$25.17

Gasket-gear Housin

$6.96

Part Number:921-04229

In Stock

$6.96

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-644A766 (2005) Bronco RotoTiller 919-04013 OEM replacement Housing-transmissi

Housing-transmissi Obsolete - Not Available

$216.07

Part Number:919-04013

Discontinued

G10

Seal-oil

$19.98

Part Number:921-04036

In Stock

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

$19.98

G11