Ryobi TB490BC User Manual
ENGINE PARTS - MODEL TB490BC
4-CYCLE GAS TRIMMER
PPN - 41BDT49C063
1
46
45
49
50
51
52
54
53
47
48
89
55
57
58
62
88
87
59
60
68
73
74
75
72
71
70
67
76
77
78
79
80
69
81
82
83
84
82
85
66
65
64
63
56
2
3
16
17
18
19
20
21
22
23
25
26
86
27
30
31
33
36
4
5
8
10
6
7
9
13
11
38
12
15
14
39
37
40
41
42
43
45
29
32
35
34
61
Issued 9/02
24
ENGINE PARTS - MODEL TB490BC
4-CYCLE GAS TRIMMER
PPN - 41BDT49C063
Item Part No. Description
46 791-181247 Palnut
47 753-1199 Recoil Pulley
48 753-04286 Recoil Spring
49 791-182366 Nut Clip
50 791-181079 Pull Handle
51 791-611061 Rope Guide
52 791-613103 Rope
53 791-181020 Starter Housing Screw
54 753-1237 Starter Housing Assembly (includes 46-52)
55 791-182368 Clutch Washer
56 753-1238 Clutch with Spacer
57 791-153592 Clutch Drum
58 753-1239 Clutch Cover
59 791-145569 Anti-Rotation Screw
60 753-1240 Screw
61 753-1241 Nut
62 791-181345 Clutch Cover Screws
63 753-04298 Ignition Module with Screws
64 791-181065 Spacer
65 753-04299 Flywheel
66 791-182743 Shroud Assembly with Screws
67 791-182376 Crankcase Assembly (includes 68 & 69)
68 791-182375 90° Elbow
69 791-182379 Breather Hose
70 791-181015 Cam Gear
71 753-1242 Cam Follower Set
72 791-181013 Cam Bracket
73 791-181012 Cam Bracket Screw
74 791-181040 Valves, Intake and Exhaust
75 791-182374 Cylinder Gasket
76 791-181018 Oil Pan Gasket
77 791-182377 Oil Pan (includes 76 & 78)
78 791-181020 Oil Pan Screw
79 753-04041 Dipstick Assembly (includes 84)
80 791-182290 O-Ring
81 791-181009 Connecting Rod
82 791-181008 Wrist Pin Button
83 753-1243 Piston
84 791-181006 Wrist Pin
85 791-182295 Piston Ring Set
86 791-182409 Washer
87 791-181861 Screw
88 791-612468 Compression Spring
89 791-182537 Grommet
* 791-180852B Spark Plug
* 753-1245 Short Block Assembly (includes 3-15, 66-85)
* 791-180142 Starter Pawl Repair Kit
* 791-182156 Carburetor Repair Kit
* 753-1248 Gasket Diaphragm Repair Kit
* Parts not shown
Item Part No. Description
1 753-04083 Engine Cover
2 791-182339 Engine Cover Screws
3 791-181025 Valve Cover Screw
4 791-182098 Valve Cover
5 791-182099 Valve Cover Gasket
6 791-182340 Rocker Adjustment Nut
7 791-182101 Rocker Arm Pivot
8 791-182100 Rocker Arm
9 791-182341 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
14 791-182745 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
22 753-04296 Carburetor with Primer
23 791-181751 O-Ring, Carburetor
24 753-04305 Air Filter/Choke Cover Assembly
(includes 27)
25 791-182097 Breather Tube
26 791-181750 Air Filter Mounting Screw
27 791-181757 Air Filter
28 753-04316 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
36 753-04297 Throttle Cable
37 791-182358 Muffler Baffle
38 791-181048 Muffler Gasket
39 791-182359 Muffler (includes 38, 40-42)
40 791-180890 Spark Arrestor Screen
41 791-181045 Screen Cover
42 791-181046 Screw
42 791-182361 Muffler Mounting Screw
44 753-04092 Muffler Cover
45 791-182804 Switch Wire Assembly
Issued 9/02
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