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Troybilt
Gas Line Trimmer

Model # TB4000 Official Troybilt trimmer

Here are the diagrams and repair parts for Official Troybilt TB4000 trimmer, as well as links to manuals and error code tables, if available.

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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 155 parts  |
Line Trimmer Ratchet 181745
#80

Engine parts diagram

Line trimmer ratchet

Part #181745

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

O-ring 181000
#15

Engine parts diagram

O-ring

Part #181000

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

Lead Wire 182126
#71

Engine parts diagram

Lead wire

Part #182126

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

Fuel Line 182129
#96

Engine parts diagram

Fuel line

Part #182129

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

Pulley Nut 182187
#77

Engine parts diagram

Pulley nut

Part #182187

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

Spark Arrestor Screen 182153

#NI04

All parts diagram

Spark arrestor screen

Part #182153

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

Rope Guide 182122
#90

Engine parts diagram

Rope guide

Part #182122

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

Lead Wire 181690
#7

Boom and trimmer diagram

Lead wire

Part #181690

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

Recoil Case Assembly (includes 82-91) 182117
#92

Engine parts diagram

Recoil case assembly (includes 82-91)

Part #182117

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

Bushing 182199
#42

Boom and trimmer diagram

Bushing

Part #182199

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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