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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
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