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Troybilt
Gas Line Trimmer

Model # TB90BC Official Troybilt 2-cycle gas trimmer/brushcutter

Here are the diagrams and repair parts for Official Troybilt TB90BC 2-cycle gas trimmer/brushcutter, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 113 parts  |
Blade 791-145873
#42

Handle/throttle housing/shield diagram

Blade

Part #791-145873

Replaced by #791-145873B

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Manufacturer substitution
This part replaces 791-145873. Substitute parts can look different from the original.

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$57.59 | 
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In Stock
Rope Guide 753-1200
#25

Engine parts diagram

Rope guide

Part #753-1200

$20.63
In Stock
Reed Assembly 791-684451
#11

Engine parts diagram

Reed assembly

Part #791-684451

The manufacturer no longer makes this part, and there's no substitute part

Rope 791-613103
#28

Engine parts diagram

Rope

Part #791-613103

The manufacturer no longer makes this part, and there's no substitute part

Up Boom Assembly 753-04236
#8

Handle/throttle housing/shield diagram

Up boom assembly

Part #753-04236

The manufacturer no longer makes this part, and there's no substitute part

Piston Rod 753-1207
#50

Engine parts diagram

Piston rod

Part #753-1207

The manufacturer no longer makes this part, and there's no substitute part

Primer 791-683974B
#9

Engine parts diagram

Primer

Part #791-683974B

The manufacturer no longer makes this part, and there's no substitute part

Clamp 791-181813
#15

Handle/throttle housing/shield diagram

Clamp

Part #791-181813

The manufacturer no longer makes this part, and there's no substitute part

Strap 791-682075
#43C

Handle/throttle housing/shield diagram

Strap

Part #791-682075

The manufacturer no longer makes this part, and there's no substitute part

Shifter Block 753-04334

#NI04

All parts diagram

Shifter block

Part #753-04334

The manufacturer no longer makes this part, and there's no substitute part

Symptoms for gas line trimmers

Choose a symptom to see related grass line trimmer repairs.

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Why won't my gas line trimmer start?

Main causes: stale fuel, cracked fuel lines, dirty carburetor, bad spark plug, worn piston rings…

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Why does my gas line trimmer run rough?

Main causes: stale fuel, clogged fuel filter, faulty spark plug, clogged air filter, cracked fuel lines, clogged carbure…

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Why does my gas line trimmer leak gas?

Main causes: cracked fuel lines, bad carburetor seals, leaky fuel tank cap, damaged fuel tank…

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Repair guides for gas line trimmers

These step-by-step repair guides will help you safely fix what’s broken on your grass line trimmer.

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How to rebuild a line trimmer carburetor

How to rebuild a line trimmer carburetor

If the line trimmer engine won't start even though there's fuel in the tank, the carburetor could be the problem. Follow…

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Repair difficulty
Time required
 15 minutes or less
How to replace a line trimmer carburetor

How to replace a line trimmer carburetor

If the line trimmer won't start even though there's fuel in the tank, the carburetor could be the problem. Follow these …

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Repair difficulty
Time required
 15 minutes or less
How to replace a line trimmer fuel line

How to replace a line trimmer fuel line

The fuel line on a grass line trimmer deteriorates with time and eventually can split or crack. You can replace it yours…

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Repair difficulty
Time required
 15 minutes or less

Articles and videos for gas line trimmers

Use the advice and tips in these articles and videos to get the most out of your grass line trimmer.

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Top 10 electric lawn and garden tools for 2023

Top 10 electric lawn and garden tools for 2023

Learn about the top 10 must-have electric lawn & garden tools for 2023…

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How to enjoy all the online benefits we offer on our Sears PartsDirect website

How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

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Grass line trimmer maintenance checklist

Grass line trimmer maintenance checklist

Find out how to take care of your grass line trimmer from the start of the trimming season until the end, with this help…

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