Issued 1/02
Item
Part No. Description
34 753-1203 Starter Housing Assembly
(includes 26-31 & 41)
35 791-181862 Housing Screw
36 791-182368 Clutch Washer
37 791-182369 Clutch Rotor Assembly
38 791-153592 Clutch Drum Assembly
39 791-612468 Spring
40 753-1204 Clutch Cover Assembly
(includes 41-44)
41 791-181345 Cover Screw
42 791-182519 Anti-Rotation Screw
43 753-04003 Clamping Screw
44 791-180217 Clamping Nut
45 791-182798 Wire Leads and Sleeve
46 791-611063 Ground Tab
47 753-1205 Module Assembly
48 791-610311B Spark Plug
49 791-182066 Muffler Assembly (includes 50-52)
50 791-182747 Spark Arrestor Screen
51 791-182065 Exhaust Gasket
52 791-147575 Muffler Mounting Bolt Assembly
53 753-1206 Cylinder Assembly (includes 55)
54 753-1207 Piston and Rod Assembly
55 753-1197 Cylinder Gasket
56 791-182723 Cylinder Bolt
* 791-180090 O.E.M. Carburetor Repair Kit (Zama)
* 791-180091 Gasket Diaphragm Repair Kit (Zama)
* 753-1209 Piston Ring Set
* 753-1210 Short Block Assembly
(includes 8, 12, 14, 22, 48, 51-56)
* 791-610309 Crankcase Seal
* 791-181599 Clutch Springs (Qty. 2)
* Items Not Shown
41
1
2
3
6
8
10
3
4
5
9
11
13
14
54
55
12
20
56
18
15
16
17
19
36
37
38
39
24
25
32
26
27
30
28
35
44
34
23
46
47
53
48
51
49
52
22
21
7
ENGINE PARTS - MODEL TB90BC
2-CYCLE GAS TRIMMER/BRUSHCUTTER
PPN 41ADT90C063
45
42
41
40
50
Item Part No. Description
1 753-1192 Air Cleaner/Muffler Cover Assembly
(includes 2 & 41)
2 791-180350B Air Cleaner Filter
3 791-180351 Carburetor Mounting Screw Assembly
4 753-1193 Choke Extension
5 753-1194 Choke Plate
6 753-1195 Carburetor Assembly W/Limiter Caps
(includes 7 & 18)
7 791-610675 Carburetor Gasket
8 791-181860 Carb Mount Screw
9 791-181801 Primer and Hose Assembly
10 791-182063 Carb Mount Assembly (includes 8)
11 791-684451 Reed Assembly
12 791-182790 Power Shaft Assembly
13 753-1208 Carburetor Mount Gasket
14 791-182807 Crank Case Service Assembly
(includes 10, 12 & 22)
15 791-612134 Rear Mounting Pad
16 753-1198 Fuel Tank Assembly (includes 17-19)
17 791-182612 Fuel Cap Assembly
18 791-181168 Fuel Return Line
19 791-682039 Fuel Line Assembly
20 791-145308 Front Mounting Pad
21 791-153520 Shroud Assembly
22 791-181861 Shroud Screw
23 791-182064 Shroud Extension and Stand
24 791-181867 Flywheel Assembly
25 791-181065 Spacer
26 753-1199 Recoil Pulley Assembly
27 791-613102 Recoil Spring
28 753-1200 Rope Guide
29 791-181441 Pulley Retainer
30 791-181079 Pull Handle
31 791-613102 Rope
32 753-1201 Pressure Plate Assembly
33 7531202 Plate Screw
33
29
31
41
43
25
26
26
30
27
27
28
32
33
38
36
37
42
35
31
34
34
40
39
35
41
43
1
1
6
15
16
17
18
14
13
11
10
9
12
8
7
2
3
4
5
29
21
20
19
22
23
24
Issued 9/01
BOOM AND TRIMMER PARTS - MODEL TB90BC
2-CYCLE GAS TRIMMER/BRUSHCUTTER
PPN 41ADT90C063
Item Part
No. Description
1 182801 Throttle Housing and Trigger
Assembly (includes 2-4)
2 182802 Throttle Trigger Lock-Out
3 182803 Throttle Trigger
4 182690 Throttle Trigger Spring
5 182539 Switch Assembly (includes 6)
6 182357 Throttle Cable Assembly
7 610327 Harness Clip
8 182309 Upper Drive Shaft Housing Assembly
9 181099 J-Handle Assembly (includes 10 & 11)
10 612831 Grip
11 612021 Tube Closure
12 683295 Handle Bracket Assembly (includes 13-18)
13 181811 Screw
14 181812 Upper Handle Clamp
15 181813 Middle Handle Clamp
16 181814 Lower Handle Clamp
17 181815 Nut
18 145569 Anti-Rotation Screw
19 181616 Click-Link Coupler (includes 20-23)
20 182057 Screw
21 181617 Bolt
22 181618 Adjustment Knob
23 181886 Knob Retaining Nut
24 180804 Lower Drive Shaft Housing Assembly
25 613300 Lower Flexible Drive Shaft
26 182200 Shield Mount Screw Assembly
27 182193 2 piece Gearbox Assembly (includes 28-30)
28 182195 Gearbox Mounting Hardware
29 145569 Anti-Rotation Screw
30 182196 Blade Driver
31 147492 Blade Shield/Shield Mount
32 683304 Shield Mounting Screw
33 683299 Shield and Blade Assembly (includes 34)
34 682061 Blade Assembly
35 147490 Retaining Washer
36 612483 Spool Shaft
37 683301 Outer Spool and Eyelet Assembly
38 612026 Retainer
39 610636 Spring
40 147495 Inner Reel
41 180814 Bump Head Knob Assembly
42 145873 4-Tooth Blade
43 181699 Nut
* 180014 Blade Retaining Kit (includes 35 & 43)
* 613226 Locking Rod Tool
* 682075 Shoulder Harness
2
Piece Gearbox Assembly Parts – Item 27
44 182191 Left Housing
45 182192 Right Housing
46 182194 Pinion Gear Assembly
47 182199 Output Shaft Bushing
48 182198 Output Shaft Gear
49 182197 Output Shaft Assembly (includes 46 & 47)
Optional Accessories
* 180120 Replacement Line,
0.095 Diameter
* 147345 Reel and Line Assembly
* 147498 Bump Head Assembly
(includes 36-41)
* 147543 Ryobi 2-Cycle Oil
* Items Not Shown
47
48
44
28
45
30
29
28
46
49