Manuals+

MTD TB90BC 2-Cycle Gas Trimmer/Brushcutter Parts

Engine Parts

This section details the engine components for the MTD TB90BC 2-cycle gas trimmer/brushcutter. The diagram shows an exploded view of the engine assembly with numbered parts corresponding to the list below.

ItemPart No.Description
1753-1192Air Cleaner/Muffler Cover Assembly (includes 2 & 41)
2791-180350BAir Cleaner Filter
3791-180351Carburetor Mounting Screw Assembly
4753-1193Choke Extension
5753-1194Choke Plate
6753-1195Carburetor Assembly W/Limiter Caps (includes 7 & 18)
7791-610675Carburetor Gasket
8791-181860Carb Mount Screw
9791-181801Primer and Hose Assembly
10791-182063Carb Mount Assembly (includes 8)
11791-684451Reed Assembly
12791-182790Power Shaft Assembly
13753-1208Carburetor Mount Gasket
14791-182807Crank Case Service Assembly (includes 10, 12 & 22)
15791-612134Rear Mounting Pad
16753-1198Fuel Tank Assembly (includes 17-19)
17791-182612Fuel Cap Assembly
18791-181168Fuel Return Line
19791-682039Fuel Line Assembly
20791-145308Front Mounting Pad
21791-153520Shroud Assembly
22791-181861Shroud Screw
23791-182064Shroud Extension and Stand
24791-181867Flywheel Assembly
25791-181065Spacer
26753-1199Recoil Pulley Assembly
27791-613102Recoil Spring
28753-1200Rope Guide
29791-181441Pulley Retainer
30791-181079Pull Handle
31791-613102Rope
32753-1201Pressure Plate Assembly
337531202Plate Screw
34753-1203Starter Housing Assembly (includes 26-31 & 41)
35791-181862Housing Screw
36791-182368Clutch Washer
37791-182369Clutch Rotor Assembly
38791-153592Clutch Drum Assembly
39791-612468Spring
40753-1204Clutch Cover Assembly (includes 41-44)
41791-181345Cover Screw
42791-182519Anti-Rotation Screw
43753-04003Clamping Screw
44791-180217Clamping Nut
45791-182798Wire Leads and Sleeve
46791-611063Ground Tab
47753-1205Module Assembly
48791-610311BSpark Plug
49791-182066Muffler Assembly (includes 50-52)
50791-182747Spark Arrestor Screen
51791-182065Exhaust Gasket
52791-147575Muffler Mounting Bolt Assembly
53753-1206Cylinder Assembly (includes 55)
54753-1207Piston and Rod Assembly
55753-1197Cylinder Gasket
56791-182723Cylinder Bolt
*791-180090O.E.M. Carburetor Repair Kit (Zama)
*791-180091Gasket Diaphragm Repair Kit (Zama)
*753-1209Piston Ring Set
*753-1210Short Block Assembly (includes 8, 12, 14, 22, 48, 51-56)
*791-610309Crankcase Seal
*791-181599Clutch Springs (Qty. 2)

Boom and Trimmer Parts

This section details the boom and trimmer components for the MTD TB90BC 2-cycle gas trimmer/brushcutter. The diagram shows an exploded view of the trimmer assembly, including the boom, handle, gearbox, and cutting head, with numbered parts corresponding to the list below.

ItemPart No.Description
1182801Throttle Housing and Trigger Assembly (includes 2-4)
2182802Throttle Trigger Lock-Out
3182803Throttle Trigger
4182690Throttle Trigger Spring
5182539Switch Assembly (includes 6)
6182357Throttle Cable Assembly
7610327Harness Clip
8182309Upper Drive Shaft Housing Assembly
9181099J-Handle Assembly (includes 10 & 11)
10612831Grip
11612021Tube Closure
12683295Handle Bracket Assembly (includes 13-18)
13181811Screw
14181812Upper Handle Clamp
15181813Middle Handle Clamp
16181814Lower Handle Clamp
17181815Nut
18145569Anti-Rotation Screw
19181616Click-Link Coupler (includes 20-23)
20182057Screw
21181617Bolt
22181618Adjustment Knob
23181886Knob Retaining Nut
24180804Lower Drive Shaft Housing Assembly
25613300Lower Flexible Drive Shaft
26182200Shield Mount Screw Assembly
271821932 piece Gearbox Assembly (includes 28-30)
28182195Gearbox Mounting Hardware
29145569Anti-Rotation Screw
30182196Blade Driver
31147492Blade Shield/Shield Mount
32683304Shield Mounting Screw
3368299Shield and Blade Assembly (includes 34)
34682061Blade Assembly
35147490Retaining Washer
36612483Spool Shaft
37683301Outer Spool and Eyelet Assembly
38612026Retainer
39610636Spring
40147495Inner Reel
41180814Bump Head Knob Assembly
421458734-Tooth Blade
43181699Nut
*180014Blade Retaining Kit (includes 35 & 43)
*613226Locking Rod Tool
*682075Shoulder Harness

2 Piece Gearbox Assembly Parts – Item 27

ItemPart No.Description
44182191Left Housing
45182192Right Housing
46182194Pinion Gear Assembly
47182199Output Shaft Bushing
48182198Output Shaft Gear
49182197Output Shaft Assembly (includes 46 & 47)

Optional Accessories

Part No.Description
180120Replacement Line, 0.095 Diameter
147345Reel and Line Assembly
147498Bump Head Assembly (includes 36-41)
147543Ryobi 2-Cycle Oil

PDF preview unavailable. Download the PDF instead.

0752a676-3029-8e84-815c-894586120956 Acrobat Distiller 5.00 for Macintosh

Related Documents

Preview MTD Model 790r 2-Cycle Gas Trimmer/Brushcutter Engine and Gearbox Parts List
Comprehensive parts list and diagrams for the MTD Model 790r 2-cycle gas trimmer/brushcutter, detailing engine and gearbox components with part numbers and descriptions.
Preview MTD 775r 2-Cycle Gas Trimmer Parts List and Diagrams
Comprehensive parts list and diagrams for the MTD 775r 2-cycle gas trimmer, including engine and boom components. Find part numbers and descriptions for maintenance and repair.
Preview MTD TBP6040 4-Cycle Gas Trimmer Replacement Parts List
Comprehensive replacement parts list and diagrams for the MTD TBP6040 4-Cycle Gas Trimmer. This document details all components, including engine parts, drive shafts, cutting head assemblies, and accessories, with corresponding part numbers for easy identification and ordering.
Preview MTD 700r 2-Cycle Gas Trimmer Parts List and Diagrams
Detailed parts list and diagrams for the MTD 700r 2-cycle gas trimmer, including engine and boom/trimmer components.
Preview MTD 825r 4-Cycle Gas Trimmer Parts List and Diagrams
Comprehensive parts list and exploded view diagrams for the MTD 825r 4-Cycle Gas Trimmer (PPN: 41AD825A034). Includes detailed part numbers and descriptions for engine, boom, and trimmer head components.
Preview MTD TB32 EC 2-Cycle Trimmer Replacement Parts Guide
Comprehensive replacement parts list and diagram descriptions for the MTD TB32 EC 2-Cycle Trimmer (Model 41BDZ32C766). Find part numbers and descriptions for engine, handle, drive shaft, and cutting head components.
Preview MTD YM2900EC 2-Cycle Gas Trimmer/Brushcutter Replacement Parts Guide
Detailed replacement parts list and diagrams for the MTD YM2900EC 2-cycle gas trimmer and brushcutter. Find part numbers and descriptions for engine components, handles, cutting head, and accessories.
Preview MTD TB475SS 4-Cycle Gas Trimmer Parts Diagram and List
Comprehensive parts list and exploded diagrams for the MTD TB475SS 4-Cycle Gas Trimmer, essential for identification, maintenance, and repair of engine and boom components.