Troy-Bilt 640 Series Setup guide

TROY-BILT LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019
Printed In USA
Il l u s t r a t e d Pa r t s Ma n u a l
Small Frame Tiller — 640 & 650 Series
Form No. 769-03893
(February 22, 2008)

22
640 & 650 Series Handle & Tine Shield
23
27
25
28
41
33
22
36
31
34
4
29
30
4
1
7
16
2
12 18 46
7
15
8
7
19
11
21
9
20
3
9
10 14
5
13
17
7
44
49
6
24
37
6
32
49
48
24 40
35
38
26
4
47
43
45
47 39
A
A
48
39
42

33
640 & 650 Series Handle & Tine Shield
Ref. Part Number Description
1. 686-04076 Tine Hood Assembly (A)
—686-04077 Tine Hood Assembly (B, C)
2. 710-0395 Hex Screw, ⁄-18 x 2.25
3. 710-0597 Hex Head Screw, ⁄-20 x 1
4. 710-0599 Self-Tapping Screw, ⁄-20 x ⁄
5. 710 - 0874 Hex Head Screw, ⁄-18 x 1-⁄
6. 710-3008 Hex Head Screw, ⁄-18 x .75
7. 712- 04063 Nylon Hex Lock Nut, ⁄-18
8. 712- 04064 Nylon Hex Lock Nut, ⁄-20
9. 715-0108 Spirol Pin
10. 732-04320 Depth Regulator Spring
11. 736-0275 Flat Washer, ⁄
12. 750 -04149 Spacer, .462 x .328 x 1.63
13. 750-04160 Bushing
14. 750-04556 Spacer
15. 786-04092 Reverse Stop Arm
16. 786-04098 Channel Support Bracket
17. 786-04104 Drag Bar
18. 786-04191 Flap Stop Bracket
19. 786-04290 Hood Bracket, Left Hand
20. 786-04291 Hood Bracket, Right Hand
21. 786-04292 Adjustable Depth Bar
22. 710-0106 Hex Hd. Screw, ⁄-20 x 1-⁄
23. 710-04163 Screw, #10-24 x 2
24. 712-3009 Hex Lock Nut, ⁄-18
25. 712-0121 Hex Nut, #10-24
Ref. Part Number Description
26. 712- 0291 Hex Lock Nut, ⁄-20
27. 732-04185 Forward Clutch Spring
28. 746-04208 Forward Clutch Cable Assembly
29. 746-04058 Rev. Clutch Cable Assembly (B, C)
30. 747-04210 Forward Clutch Bail
31. 749 - 04084 Upper Handlebar
32. 749-04208 Lower Handlebar
33. 749-04106 Conduit Mount Tab
34. 786-04040 Reverse Clutch Cable Bracket (B, C)
35. 786-04188 Handlebar Support
36. 786-04200 Panel
37. 710-0216 Hex Screw, ⁄-16 x ⁄
38. 710-0805 Hex Screw, ⁄-18 x 1-⁄
39. 712-3000 Hex Lock Nut, ⁄-16
40. 736 - 0119 Lock Washer, ⁄
41. 725-0157 Cable Tie
42. 736-3050 Flat Washer, ⁄
43. 712-04065 Flange Lock Nut, ⁄-16
44. 710-0347 Hex Hd. Screw, ⁄-16 x 1-⁄
45. 710-0514 Hex Hd. Screw, ⁄-16 x 1
46. 710-04048 Flange Screw, .312-18 x 1.00
47. 742- 0 4117 Single Bolo Tine Left Hand
48. 742- 0 4116 Single Bolo Tine Right Hand
49. 686-04066 Tine Holder (A)
— 686-04065 Tine Holder (B, C)
(A) — Bronco
(B) — Super Bronco
(C) — Pro Line

44
640 & 650 Series Drive System
23
29
8
19
27
14
40
45
44
13 49
12
46
21
23
34
39
23
5
37
17
32
15
27
20
36
25
33
28
35
22
31
30
6
2
42
7
48
26
1
10
1
4
18
43
11
15
9
37
16
24
18
38
3
18 38
3
641
32
36
11
43 50
42
2
30
31 35
25
28
33 22
37
17
15
27
20
47
A
A
Bronco
Engine shown for reference only.

55
640 & 650 Series Drive System
Ref. Part Number Description
1. 736-0159 Flat Washer, ⁄
2. 756-04198 Engine Drive Pulley
3. 656-04023A Transmission Pulley (A)
—656-04005A Transmission Pulley (B, C)
4. 756-04169 Reverse Idler Pulley (B, C)
5. 786-04095 Belts/Pulleys Guard
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 Belt Cover Bracket
15. 748- 04087 Shoulder Washer
16. 786-04276 Reverse Idler Arm (B, C)
17. 786-04275 Forward Idler Lever
18. 710 - 0117 Hex Head Screw, ⁄-24 x 1
19. 710-0237 Hex Head Screw, ⁄-24 x ⁄
20. 710-0376 Hex Head Screw, ⁄-18 x 1
21. 710-04049 Hex Head Screw, ⁄-18 x ⁄
22. 710-0347 Hex Head Screw, ⁄-16 x 1-⁄ (A)
—710-0520 Hex Head Screw, ⁄-16 x 1.50 (B, C)
23. 710-0599 Self-Tapping Screw, ⁄-20 x ⁄
24. 710-3103 Hex Head Screw, ⁄-18 x 2 (B, C)
25. 712-3000 Lock Nut, ⁄-16
26. 712-3009 Lock Nut, ⁄-18 (B, C)
Ref. Part Number Description
27. 73 6 - 0119 Lock Washer, ⁄ (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, .260 x .720 x .060
30. 736-0452 Bell Washer, .396 x 1.140 x .095
31. 710-0459A Hex Head Screw, ⁄-24 x 1.50
32. 736-04181 Support Washer, .690 x 1.250 x .075
33. 732-04085 Forward Return Spring
34. 786-04107 Cable Mounting Bracket
35. 756 - 04170 Forward Idler Pulley
36. 714-0105 Key, ⁄” x 1”
37. 736-3078 Flat Washer, .344 x 1.00 x .063
38. 736-04193 Belleville Washer, .827 x .331 x .098
39. 710-0805 Hex Screw, ⁄-18 x 1.50 (A, B)
—710-0395 Hex Screw, ⁄-18 x 2-⁄ (C)
40. 712-04063 Hex Lock Nut, ⁄-18
41. 750-0258 Shlder Spacer, .315 x .750 x .375 (A)
42. 736-0315 Flat Washer, .75 x 1.5 x .125 (A)
—736-04192 Flat Washer, .786 x 1.000 x .031 (B, C)
43. 736-0242 Bell Washer, .340 x .872 x .060
44. 749-04193 Bumper (C)
45. 726-0201 Speed Nut, ⁄-18 (C)
46. 714-0143 Klik Pin
47. 734- 04188 Complete Wheel Ass., 10 x 2.75 (A)
48. 634-04232 Complete Whl. Ass., 13 x 5 x 6 (B, C)
49. 618-04360A Transmission Assembly (A)
—618-04362 Transmission Assembly (B, C)
50. 710-0672 Hex Head Screw, ⁄-24 x 1.25
(A) — Bronco
(B) — Super Bronco
(C) — Pro Line

66
640 & 650 Series Transmission Assembly
16
20
11
25
7
9
4
41
18
22
426 18
20
17 11
20 25
6
27
3
5
19
13
21
21
21
21
12
2
25
20
11
17
25
20 11
16
20
23
24
15
25
24
23
10
8

77
640 & 650 Series Transmission Assembly
Ref. Part Number Description
1. 1918377 Cover Housing
2. 619- 04013 Transmission Housing
3. 710-04048 Hex Head Flange Screw
4. 710-04049 Hex Head Flange Screw
5. 710-3008 Hex Screw
6. 711- 0 4078 Tiller Shaft
7. 711- 0 4 4 8 6 Wheel Shaft
8. 711- 0 48 82 Drive Shaft
9. 714-04059 Hi-Pro Key
10. 716-04102 Retaining Ring
11. 716-04104 Retaining Ring
12. 717- 04380 Worm Gear, 61T
13. 717- 04381 Worm Gear, 30T
14. 718-04008 Rear Bearing Cover
15. 721-04030 Oil Seal, .75 x 1.783
16. 721-04031 Oil Seal, 1.0 x 1.499
17. 721-04036 Oil Seal, 1.0 x 1.5
18. 721-04229 Gear Housing Gasket
19. 73 6 - 0119 Lock Washer
20. 736-04309 Flat Washer, 1.375 x 1.015 x .062*
—736-04308 Flat Washer, 1.5 x 1.75 x .01*
—736-04307 Flat Washer, 1.5 x 1.75 x .03*
—736-04306 Flat Washer, 1.5 x 1.75 x .005*
—736-04305 Flat Washer, 1.5 x 1.75 x .062*
—736-04304 Flat Washer, 1.25 x .75 x .06*
—736-04260 Flat Washer, 1.015 x 1.375 x .03*
— 736-04259 Flat Washer, 1.015 x 1.375 x .015*
—736-04258 Flat Washer, 1.015 x 1.375 x .01*
—736-04257 Flat Washer, 1.015 x 1.375 x .005*
21. 736-04310 Flat Washer, 1.015 x 1.234 x .062
22. 737-04202 Pipe Plug
23. 741-04298 Cone Bearing
24. 741- 04299 Cup Bearing
25. 741-04300 Bushing, 1.005 x 1.25 x 1.5
26. 786-04359 Transmission Cover
27. GW-1104 Woodru Key, .25 x 1.12
* — The at washers listed are used as required to obtain .005 to
.030 in allowable end play on the wheel shaft and tine shaft and
a .005 to .015 in end play on the drive shaft.

Troy-Bilt Engine (170-TO)
8

Troy-Bilt Engine (170-TO)
Part No. Part Description Ref
No. Qty.
751-10806 Air Filter Heating Pipe Base 20 1
751-10792 Ignition Complete 22 1
751-10818 Air Filter Housing 24 1
751-10794 Air Filter 24 1
751-10796 Fuel Tank 28 1
751-10790 Recoil Starter Assembly 34 1
751-10649 Fuel Filler Cap Complete 38 1
751-10654 Governor Spring 44 1
751-10657 Stud 8 × 34 57 2
751-10292 Spark Plug 58 1
751-10793 Muer 64 1
751-10662 Dipstick Decoration Cover 65 1
751-10648 Push Rod Kit 71/72 —
Valve Lifter 71 2
Push Rod 72 2
751-10647 Valve Kit 73/74 —
Inlet Valve 73 1
Exhaust Valve 74 1
751-10651 Fuel Tank Nipple 79 1
751-10655 Dipstick 82 1
751-10656 Engine/Dipstick Cover 83 1
751-10797 Carburetor 90 1
751-10799 Cylinder Head — —
Rocker Arm 51 2
Valve Adjusting Nut 52 2
Pivot Locking Nut 53 2
Cylinder Head Complete 54 1
Dowel Pin 56 2
Muer Gasket 59 1
Part No. Part Description Ref
No. Qty.
751-10798 Short Block — —
Bolt 1 6
Oil Filler Plug 2 1
O-Ring 3 1
Oil Seal 4 1
Left Crankcase Cover 5 1
Radial Ball Bearing 6 1
Camshaft Assembly 7 1
Dowel Pin 8 1
Dowel Pin 9 1
Case Cover Packing 10 1
Crankshaft Complete 11 1
Governor Kit 12 1
Radial Ball Bearing 13 1
Lock Pin 14 1
O-Ring 15 1
Governor Arm 16 1
Crankase Complete 17 1
Oil Seal 21 1
Carburetor Packing 25 1
Bolt 28 1
Nut 29 2
Head Cover Gasket 47 1
Cylinder Head Gaskket 55 1
Carburetor Insulator Packing 61 1
Carburetor Insulator 62 1
Connecting Rod Assembly 66 1
Piston Pin Clip 67 2
Piston 68 1
Piston First Ring Set 69 1
Piston Pin 70 1
751-10307 Flywheel Key (Not Shown) — —
751-10800 Carb. Kit Major (Not Shown) — —
751-10801 Gasket Kit — Ext. (Not Shown) — —
751-10802 Gasket Kit — Comp. (Not Shown) — —
9

Notes
10