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.

There are a couple of ways to find the part or diagram you need:

Click a diagram to see the parts shown on that diagram.
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”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Owner’s manual

Model diagram and schematic

SEARCH WITHIN THIS MODEL

ALL PARTS

Showing 10 of 155 parts |

#39

Boom and trimmer diagram

Housing

Part #182191

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

#58

Engine parts diagram

Front housing

Part #182829

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

#44

Boom and trimmer diagram

Shaft

Part #182197

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

Boom and trimmer diagram

Strap clip

Part #610327

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

#84

Engine parts diagram

Pulley

Part #181738

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

#41

Engine parts diagram

Carburetor gasket

Part #182270

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

Boom and trimmer diagram

Trigger

Part #180975

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

#65

Engine parts diagram

Snap ring

Part #182128

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

#91

Engine parts diagram

Screw

Part #182143

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

#30

Boom and trimmer diagram

Washer

Part #147490

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.

View all

Why won't my gas line trimmer start?

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

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…

Why does my gas line trimmer leak gas?

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

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.

View all

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…

Repair difficulty

Time required

15 minutes or less

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 …

Repair difficulty

Time required

15 minutes or less

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…

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.

View all

Top 10 electric lawn and garden tools for 2023

Model # TB4000 Official Troybilt trimmer

Model diagram and schematic

SEARCH WITHIN THIS MODEL

Symptoms for gas line trimmers

Why won't my gas line trimmer start?

Why does my gas line trimmer run rough?

Why does my gas line trimmer leak gas?

Repair guides for gas line trimmers

How to rebuild a line trimmer carburetor

How to replace a line trimmer carburetor

How to replace a line trimmer fuel line

Articles and videos for gas line trimmers

Top 10 electric lawn and garden tools for 2023

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

Grass line trimmer maintenance checklist

Parts & More

Stay Connected

Quick links

Let us help you

More resources