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MTD
Gas Line Trimmer

Model # 41AD778C799 Official MTD gas trimmer

Here are the diagrams and repair parts for Official MTD 41AD778C799 gas trimmer, 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 72 parts  |
Kmart Line Trimmer Flexible Drive Shaft 753-05267
#16

Driveshaft/handle/shield diagram

Kmart line trimmer flexible drive shaft

Part #753-05267

$43.20 | 
12% OFF Phone Price : $49.20
In Stock
Line Trimmer Throttle Cable 753-05222
#42

Cylinder/fuel tank/muffler diagram

Line trimmer throttle cable

Part #753-05222

This item is not returnable
$24.62 | 
20% OFF Phone Price : $30.62
In Stock
Line Trimmer Ignition Coil 753-05226
#33

Cylinder/fuel tank/muffler diagram

Line trimmer ignition coil

Part #753-05226

$130.28
In Stock
Lawn & Garden Equipment Engine Carburetor Engine Mount 753-05217
#9

Cylinder/fuel tank/muffler diagram

Lawn & garden equipment engine carburetor engine mount

Part #753-05217

$63.98
In Stock
Line Trimmer Handle 791-182167
#9

Driveshaft/handle/shield diagram

Line trimmer handle

Part #791-182167

$102.80
In Stock
Line Trimmer Muffler 753-05169
#35

Cylinder/fuel tank/muffler diagram

Line trimmer muffler

Part #753-05169

$97.29 | 
11% OFF Phone Price : $109.29
In Stock
Line Trimmer Fuel Line 753-05219
#16

Cylinder/fuel tank/muffler diagram

Line trimmer fuel line

Part #753-05219

This item is not returnable
$17.02 | 
11% OFF Phone Price : $19.02
In Stock
Gasket 753-04619
#36

Cylinder/fuel tank/muffler diagram

Gasket

Part #753-04619

$4.33
In Stock
O-ring 753-05487
#11

Cylinder/fuel tank/muffler diagram

O-ring

Part #753-05487

Replaced by #721-04163

?
Manufacturer substitution
This part replaces 753-05487. Substitute parts can look different from the original.
This item is not returnable
$5.64 | 
15% OFF Phone Price : $6.64
In Stock
Spring 791-181599

#NI03

All parts diagram

Spring

Part #791-181599

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…

Read more
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 …

Read more
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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