Troy-Bilt 21A 643D766 Tuffy CRT Roto Tiller Parts manual (2006)

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 1 of 16
Drive and Wheels

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 2 of 16
Drive and Wheels

Ref # Part Number Qty DescriptionS/P/F

1 736-0159 Flat Washer, 5/161 S
2 756-04198 Pulley, Engine Drive1 S
3 656-04023 Transmission Pulley (for models 643C)1
3 656-04005 Transmission Pulley (for models 643B, 643D

1 S

& 645A)

4 756-04169 Pulley, Reverse Idler (for models 643B, 643D

5 786-04095 Guard, Belts/Pulleys1 S
6 754-04090 Forward Drive Belt1 S
7 754-04091 Reverse Drive Belt (for models 643B, 643D &

8 731-05268 Belt Cover1 /P
9 732-04289 Reverse Return Spring (for models 643B,

10 732-04081 Belt Guide (for models 643B, 643D & 645A)1 /P
11 732-04079 Belt Guide1 S
12 786-04068 Engine Bracket, Left1 /P
13 786-04069 Engine Bracket, Right1
14 786-04070 Bracket, Belt Cover1 S
15 748-04087 Shoulder Washer1 S
16 786-04276 Reverse Idler Arm (for models 643B, 643D &

17 786-04275 Forward Idler Lever1 S
18 710-0672 Hex Hd. Screw, 5/16-24 x 1.25 (model 643C)1 /P
18 710-0117 Hex Hd. Screw, 5/16-24 x 1 (for models

1 S

& 645A)

1 S

645A)

1 S

643D & 645A)

1 /P

645A)

1 S

643B, 643D & 645A)

19 710-0237 Hex Hd. Screw, 5/16-24 x 5/81 /P
20 710-0376 Hex Hd. Screw, 5/16-18 x 11 /P
21 710-04049 Hex Hd. Screw, 5/16-18 x 5/81 /P
22 710-0347 Hex Hd. Screw, 3/8-16 x 1-3/4 (model 643C)1 /P
22 710-0520 Hex Hd. Screw, 3/8-16 x 1.50 (for models

23 710-0599 Screw, Self-Tapping, 1/4-20 x 1/21 /P
24 710-3103 Hex Hd. Screw, 5/16-18 x 2 (for models

25 712-3000 Lock Nut, 3/8-161 S
26 712-3009 Lock Nut, 5/16-18 (for models 643B, 643D &

27 736-0119 Lock Washer, 5/16 (model 643C)1 S
28 750-0535 Spacer, .380 ID x .625 OD x .21 (model

28 736-3050 Flat Washer .406 x .812 x .051 (for models

29 736-3090 Flat Washer1 /P
30 736-0452 Bell Washer1 S
31 710-0459A Hex Hd. Screw, 3/8-24 x 1.50, GR51 /P
32 736-04181 Support Washer1 S
33 732-04085 Forward Return Spring1 /P

1 /P

643B, 643D & 645A)

1 /P

643B, 643D & 645A)

1 S

645A)

1 S

643C)

1 /P

643B, 643D & 645A)

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 3 of 16
Drive and Wheels

Ref # Part Number Qty DescriptionS/P/F

34 786-04107 Bracket, Cable Mounting1
35 756-04170 Forward Idler Pulley1 /P
36 714-0105 Key, 3/16" x 1"1 S
37 736-3078 Flat Washer1 /P
38 736-04193 Belleville Washer1 /P
39 710-0805 Hex Screw, 5/16-18 x 1.50 Gr5 (model 643C,

1 /P

model 643B & model 643D )

39 710-0395 Hex Screw, 5/16-18 x 2-1/4, Gr5 (model

40 712-04063 Nut, Hex Lock, 5/16-181 /P
41 750-0258 Spacer, Shoulder (model 643C)1 /P
42 736-0315 Washer, Flat, .75 x 1.5 x .125 (model 643C)1 /P
42 736-04192 Flat Washer .786 x 1.000 x .031 (for models

43 736-0242 Bell Washer1 /P
44 749-04193 Bumper (model 645A)1 S
45 726-0201 Nut, Speed, 5/16-18 (model 645A)1
46 714-0143 Klik Pin1 S
47 734-04188 Complete Wheel Assembly 10 x 2.75 (model

48 634-043203 Complete Wheel Assembly 12 x 4 x 6 LH

48 634-043204 Complete Wheel Assembly 12 x 4 x 6 LH

48 734-04164 Tire LH 12.0 x 4.10 x 6.00 (model 643B)1
48 634-04200 Rim Assembly (model 643B)1
48 734-0255 Air Valve (model 643B) (model 645A)1 S
48 734-04161 Complete Wheel Assembly 10 x 2.75 RH

1 /P

645A)

1 /P

643B, 643D & 645A)

1

643C)

1

(model 643B)

1

(model 643B)

1 /P

(model 643D)

48 734-04162 Complete Wheel Assembly 10 x 2.75 LH

48 634-04232 Complete Wheel Assembly 13 x 5 x 6 (model

48 634-04218 Rim Assembly (model 645A)1
48 734-04163 Tire model (model 645A)1 S
49 714-04048 Cotter Pin1 /P
50 711-04126 Clevis Pin1 /P
99 710-0117 Hex Hd. Screw, 5/16-24 x 11 S

1 /P

(model 643D)

1 S

645A)

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 4 of 16
Drive Shaft

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Drive Shaft

Ref # Part Number Qty DescriptionS/P/F

1 GW-9517 Snap Ring1 S
2 GW-1714 Bearing, Tapered Roller (with race)1 S
3 GW-50043 Support Washer, Rear1 S
4 711-04110 Drive Shaft1 S
5 GW-1224-1 Shim, Rear Bearing Cap, .010" thick1 S/F

GW-1224-2 Shim, same as above, except .030" thick1 S/F
GW-1224-3 Shim, same as above, except .005" thick1 S/F
GW-1224-4 Shim, same as above, except .062" thick1 S/F
GW-1325C Shim Set (Incl. the following shims: 2

1 /P

#1224-1, 2 #1224-2 & 1 #1224-4)

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 6 of 16
General Assembly

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 7 of 16
General Assembly

Ref # Part Number Qty DescriptionS/P/F

1 686-04043 Tine Hood Assembly (model 643C)1 S
1 686-04041 Tine Hood Assembly (models 643B & 645A)1 S
2 710-0395 Hex Screw, 5/16-18 x 2.251 /P
3 710-0597 Hex Hd. Screw, 1/4-20 x 11 /P
4 710-0599 Screw, Self-Tapping,1/4-20 x 1/21 /P
5 710-0874 Hex Hd. Screw, 5/16-18 x 1-1/41 /P
6 710-3008 Hex Hd. Screw, 5/16-18 x .751 /P
7 712-04063 Hex Lock Nut, Nylon, 5/16-181 /P
8 712-04064 Hex Lock Nut, Nylon, 1/4-201 /P

9 715-0108 Spirol Pin1 /P
10 732-04320 Spring, Depth Regulator1 /P
11 736-0275 Flat Washer, 5/161 S
12 750-04149 Spacer, .462 x .328 x 1.631
13 750-04160 Bushing1 S
14 750-04556 Spacer1
15 786-04092 Reverse Stop Arm1 /P
16 786-04098 Channel Support Bracket1
17 786-04104 Drag Bar1 /P
18 786-04191 Flap Stop Bracket1 S
19 786-04290 Hood Bracket, Left Hand1
20 786-04291 Hood Bracket, Right Hand1
21 786-04292 Adjustable Depth Bar1
22 710-0106 Hex Hd. Screw, 1/4-20 x 1-1/41 /P
23 710-04163 Screw, #10-24 x 21 /P
24 712-3009 Hex Lock Nut, 5/16-181 S
25 712-0121 Hex Nut, #10-241 S
26 712-0291 Hex Lock Nut, 1/4-201 S
27 732-04185 Spring, Forward Clutch1
28 746-04208 Cable Assembly, Forward Clutch1 S
29 746-04058 Cable Assembly, Reverse Clutch (models

1 S

643B & 645A)

30 747-04210 Bail, Forward Clutch1 S
31 749-04084 Upper Handlebar1 S
32 749-04208 Lower Handlebar1 S
33 749-04106 Tab, Conduit Mount1 S
34 786-04040 Bracket, Reverse Clutch Cable (models 643B

35 786-04188 Handlebar Support1 S
36 786-04200 Panel1 S
37 710-0216 Screw, Hex, 3/8-16 x 3/41 /P
38 710-0805 Screw, Hex, 5/16-18 x 1-1/21 /P
39 712-3000 Hex Lock Nut, 3/8-161 S
40 736-0119 Lock Washer, 5/161 S
41 725-0157 Cable Tie1 /P
42 736-3050 Flat Washer, 3/81 /P
43 712-04065 Flange Lock Nut 3/8-161 /P
44 710-0347 Hex Hd. Screw, 3/8-16 x 1-3/41 /P
45 710-0514 Hex Hd. Screw, 3/8-16 x 1, Grade 51 /P
46 710-04048 Flange Screw .312-18 x 1.001 /P
47 742-04116 Single Bolo Tine See Tine Chart1 S
48 742-04117 Single Bolo Tine See Tine Chart1 S
49 686-04066 Tine Holder (model 643C)1

1

& 645A)

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 8 of 16
General Assembly

Ref # Part Number Qty DescriptionS/P/F

49 686-04065 Tine Holder (models 643B & 645A)1 S

GW-1901 Bolo Tine Replacement Set (Incl. 8 RH tines,

1 /P

8 LH tines and req'd hardware (model 643C,
643B & 645A)

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 9 of 16
Quick Reference

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Quick Reference

Ref # Part Number Qty DescriptionS/P/F

TC-34645 Spark Plug1 /P
TC-36634 Pre Filter1 /P
TC-36046 Air Filter1 /P
N/A Fuel Filter1
754-04090 Drive Belt - FWD1 S
754-04091 Drive Belt - REV1 S
756-04170 Idler Pulley1 /P
746-04208 Clutch Cable - FWD1 S
746-04058 Clutch Cable - REV1 S
742-04117 Tines See Tine Chart1 S
742-04116 Tines See Tine Chart1 S
686-04066 Tine Holder1
N/A Rim1
N/A Tire1
734-04188 Wheel Assembly - RH Model 21A-643D1
734-04188 Wheel Assembly - LH Model 21A-643D1
634-04204-0911 Wheel Assembly - RH Model 21B-643B1 /P
634-04203-0911 Wheel Assembly - LH Model 21B-643B1 /P
734-04161 Wheel Assembly - RH Model 21B-643D1 /P
734-04162 Wheel Assembly - LH Model 21B-643D1 /P
N/A Foam Grip1
N/A Shift Control Knob1
N/A Handle Knob1

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 11 of 16
Tine Chart

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 12 of 16
Tine Chart

Ref # Part Number Qty DescriptionS/P/F

742-04116-0637 Tines1 S
742-04117-0637 Tines1 S
742-04118-0637 Tines1 /P
742-04119-0637 Tines1 /P
1901118 Set of Tines1 S
GW-1901 Set of Tines1 /P

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 13 of 16
Transmission

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 14 of 16
Transmission

Ref # Part Number Qty DescriptionS/P/F

2 1909950 Retainer, Snap Ring1 S

3 GW-1166-1 Shim, 0.062" thick1 S/F

3 GW-1166-2 Shim, 0.030" thick1 /P/F

3 GW-1166-3 Shim, 0.015" thick1 /P/F

3 GW-1166-4 Shim, 0.010" thick1 S/F

3 GW-1166-5 Shim, 0.005" thick1 S

4 GW-1086 Bronze Bushing1 S

5 711-04512 Wheel Shaft (model 643C)1 S

5 711-04092 Wheel Shaft (model 643B)1 S

5 711-04486 Wheel Shaft (model 645A)1 S

5 711-04088 Wheel Shaft (model 643D)1 S

6 GW-9305 Key, Hi-Pro, 1/4 x 11 S

7 GW-1132-2 Spacer1 /P

8 1904278 Worm Gear, Wheel Shaft1 S

9 711-04078 Tiller Shaft1 S
10 GW-1104 Woodruff Key1 /P
11 1916542 Worm Gear, Tiller Shaft1 S

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21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 15 of 16
Transmission Housing

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Transmission Housing

Ref # Part Number Qty DescriptionS/P/F

1 GW-9727 Plug, Transmission Oil Fill1 S

2 710-04049 Hex Hd. Flange Screw, 5/16-18 x 5/8,Gr. 51 /P

3 736-0119 Lock Washer, 5/161 S

4 1918377 Rear Cover, Transmission1 S

5 1916641 Front Cover, Transmission1 S

6 GW-50032 Gasket, Housing Cover1 S

7 721-04030 Oil Seal, Drive Shaft1 S

8 721-04031 Oil Seal, Wheel Shaft1 S

9 619-04013 Transmission Housing Assembly1 S
10 721-04036 Oil Seal, Tine Shaft1 S
11 736-3008 Washer, Flat, .344 x .750 x .1201 S/F
12 718-04008 Rear Bearing Cap1 S
13 710-04048 Hex Hd. Flange Screw, 5/16-18 x 11 /P
14 710-3008 Hex Hd. Flange Screw, 5/16-18 x 3/41 /P

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