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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
Page 2
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
1 791-182338 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
14 791-182700 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
Page 3
Reissued 12/01
BOOM AND TRIMMER PARTS - MODEL TB490BC
4-CYCLE GAS TRIMMER
(ppn - 41ADT49C063) (Serial Number 011...... and greater)
Item Part No. Description
1 791-00040 Throttle Housing and Trigger
Assembly (includes 2-4)
2 791-00041 Throttle Trigger Lock-Out
3 791-00042 Throttle Trigger
4 791-182690 Throttle Trigger Spring
5 791-182673 Switch Assembly
6 791-610327 Harness Clip
7 753-1247 Upper Drive Shaft Housing Assembly
8 791-181099 J-Handle Assembly (includes 9 & 10)
9 791-612831 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
2 Piece 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
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