Troy-Bilt TB490BC User manual

1
47
46
50
51
52
53
55
54
48
49
93
56
58
59
63
92 91
60
61
72
77
78
79
76
75
74
70
68
80
81
82
84
83
73
68
71
85
86
87
88
86
89
69
67
66
65
64
57
2
316 17 18
19 20
21
22
23
24
25 26
90 27
28
30
31
33
36
4
5
8
10
6
7
9
13
11
38
12
15
14
39
37
43
40
41 42
44
45
29
32
35 34
Reissued12/01
ENGINE PARTS - MODEL TB490BC
4-CYCLE GAS TRIMMER
(ppn - 41ADT49C063) (Serial Number 011...... and greater)
Part Numbers On Following Page
36A
36B
22B
22A
62

ENGINE PARTS - MODEL TB490BC
4-CYCLE GAS TRIMMER
(ppn - 41ADT49C063) (Serial Number 011...... and greater)
Reissued 12/01
Item Part No. Description
47 791-181247 Palnut
48 753-1199 Recoil Pulley
49 791-613102 Recoil Spring
50 791-182366 Nut Clip
51 791-181079 Pull Handle
52 791-611061 Rope Guide
53 791-613103 Rope
54 791-181020 Starter Housing Screw
55 753-1237 Starter Housing Assembly
(includes 49-56)
56 791-182368 Clutch Washer
57 753-1238 Clutch with Spacer
58 791-153592 Clutch Drum
59 753-1239 Clutch Cover
60 791-145569 Anti-Rotation Screw
61 753-1240 Screw
62 753-1241 Nut
63 791-181345 Clutch Cover Screw
64 791-182725 Ignition Module with Screws
65 791-181065 Spacer
66 791-181867 Flywheel
67 791-182743 Shroud Assembly with Screws
68 753-1244 Crankcase Assembly
(includes 69-73)
69 791-610309 Oil Seal
70 791-182372 Bearing
71 791-182380 Crankshaft
72 791-182375 90° Elbow
73 791-182379 Breather Hose
74 791-181015 Cam Gear
75 753-1242 Cam Follower Set
76 791-181013 Cam Bracket
77 791-181012 Cam Bracket Screw
78 791-181040 Valves, Intake and Exhaust
79 791-182374 Cylinder Gasket
80 791-181018 Oil Pan Gasket
81 791-182377 Oil Pan (includes 80 & 82)
82 791-181020 Oil Pan Screw
83 791-182378 Dipstick Assembly (includes 84)
84 791-182290 O-Ring
85 791-181009 Connecting Rod
86 791-181008 Wrist Pin Button
87 753-1243 Piston
88 791-181006 Wrist Pin
89 791-182295 Piston Ring Set
90 791-182409 Washer
91 791-181861 Screw
92 791-612468 Compression Spring
93 791-182537 Grommet
*791-180852B Spark Plug
*753-1245 Short Block Assembly
(includes 3-7, 68-89)
*791-182745 Cylinder Assembly
(includes 9, 12, 14 & 79)
*791-180142 Starter Pawl Repair Kit
*791-182156 Carburetor Repair Kit
*753-1248 Gasket Diaphragm Repair Kit
*Parts not shown
Item Part No. Description
1791-182338 Engine Cover
2791-182339 Engine Cover Screws
3791-181025 Valve Cover Screw
4791-182098 Valve Cover
5791-182099 Valve Cover Gasket
6791-182340 Rocker Adjustment Nut
7791-182101 Rocker Arm Pivot
8791-182100 Rocker Arm
9791-182341 Rocker Arm Stud
10 791-182103 Valve Spring Retainer
11 791-181038 Valve Spring
12 791-182102 Push Rod Guide
13 791-181033 Push Rod
14 791-182700 Cylinder Head (includes 9 & 12)
15 791-182344 Cylinder Screw
16 791-182345 Intake Baffle
17 791-182749 Carburetor Mount Gasket
18 791-181034 Nut
19 791-182347 Carburetor Mount (includes 18)
20 791-182348 Carburetor Mount Screw
21 791-182732 Carburetor Gasket
22A 791-182654 Carburetor with Primer
22B 753-1225 Carburetor with Primer
23 791-181751 O-Ring, Carburetor
24 753-1227 Air Filter/Choke Cover Assembly
(includes 27 & 28)
25 791-182097 Breather Tube
26 791-181750 Air Filter Mounting Screw
27 791-181757 Air Filter
28 753-1228 Air Filter Cover
29 753-1229 Fuel Cap
30 791-182352 Fuel Return Line
31 791-182353 Fuel Pick-Up Line with Filter
32 791-181080 Screw
33 791-182354 Washer
34 753-1230 Fuel Tank Assembly (includes 29-31)
35 791-182356 Fuel Tank Shield
36A 753-1234 Throttle Cable
36B 753-1231 Throttle Cable
37 791-182358 Muffler Baffle
38 791-181048 Muffler Gasket
39 791-182359 Muffler (includes 40, 42-44)
40 791-180890 Spark Arrestor Screen
41 791-181045 Screen Cover
42 791-181046 Screw
43 791-182360 Muffler Shield
44 791-182361 Muffler Mounting Screw
45 791-182362 Muffler Cover
46 791-182804 Switch Wire Assembly

Reissued 12/01
BOOM AND TRIMMER PARTS - MODEL TB490BC
4-CYCLE GAS TRIMMER
(ppn - 41ADT49C063) (Serial Number 011...... and greater)
Item Part No. Description
1791-00040 Throttle Housing and Trigger
Assembly (includes 2-4)
2791-00041 Throttle Trigger Lock-Out
3791-00042 Throttle Trigger
4791-182690 Throttle Trigger Spring
5791-182673 Switch Assembly
6791-610327 Harness Clip
7753-1247 Upper Drive Shaft Housing Assembly
8791-181099 J-Handle Assembly (includes 9 & 10)
9791-612831 Grip
10 791-612021 Tube Closure
11 791-683295 Handle Bracket Assembly (includes 12-17)
12 791-181811 Screw
13 791-181812 Upper Handle Clamp
14 791-181813 Middle Handle Clamp
15 791-181814 Lower Handle Clamp
16 791-181815 Nut
17 791-145569 Anti-Rotation Screw
18 753-1190 Click-Link Coupler (includes 18-22)
19 791-182057 Screw
20 791-181617 Bolt
21 791-181981 Adjustment Knob
22 791-181886 Knob Retaining Nut
23 791-182541 Lower Drive Shaft Housing Assembly
24 791-613300 Lower Flexible Drive Shaft
25 791-182200 Shield Mount Screw Assembly
26 791-182193 2 piece Gearbox Assembly
(includes 25, 27 & 28)
27 791-182195 Gearbox Screw
28 791-145569 Anti-Rotation Screw
29 791-147492 Blade Shield/Shield Mount
30 791-182196 Blade Driver
31 791-683304 Shield Mounting Screw
32 753-1191 Shield and Blade Assembly (includes 33)
33 791-682061 Blade Assembly
34 791-147490 Retaining Washer
35 791-612483 Spool Shaft
36 791-683301 Outer Spool and
Eyelet Assembly
37 791-612026 Retainer
38 791-610636B Spring
39 791-147495 Inner Reel
40 791-180814B Bump Head Knob Assembly
41 791-145873B 4-Tooth Blade
42 791-181699 Nut
*791-180014B Blade Retaining Kit
(includes 34 & 42)
*791-613226 Locking Rod Tool
*791-682075B πShoulder Harness
2Piece Gearbox Assembly Parts –Item 26
43 791-182191 Left Housing
44 791-182192 Right Housing
45 791-182194 Pinion Gear Assembly
46 791-182199 Output Shaft Bushing
47 791-182198 Output Shaft Gear
48 791-182197 Output Shaft Assembly
(includes 46 & 47)
49 753-1159 O-Ring
Optional Accessories
*753-1160 Reel and Line Assembly
*753-1161 Bump Head Assembly
(includes 35-40)
*753-1249 4-Cycle Oil
*Items Not Shown
17
23
24
25
27
30
30
27
27
28
31
29
33 26
26
32
37
35
41
36
34
33
22
39
38
34
40
42
1
1
5
13
14
15
16
12
11
10
8
7
6
9
4
3
2
46
47
43
44
28
45
48
18
19
20 21
27
49