Troy-Bilt 21A 643D766 Tuffy CRT Roto Tiller Parts manual (2006)
For Discount Troy Bilt Parts Call 606-678-9623 or 606-561-4983
21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 1 of 16
Drive and Wheels
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For Discount Troy Bilt Parts Call 606-678-9623 or 606-561-4983
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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For Discount Troy Bilt Parts Call 606-678-9623 or 606-561-4983
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)
www.mymowerparts.com
For Discount Troy Bilt Parts Call 606-678-9623 or 606-561-4983
21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 4 of 16
Drive Shaft
www.mymowerparts.com
For Discount Troy Bilt Parts Call 606-678-9623 or 606-561-4983
21A-643D766 Tuffy CRT Roto-Tiller (2006) Page 5 of 16
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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