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Makita
Gas Chainsaw

Model # DCS540-21 Official Makita chainsaw

Here are the diagrams and repair parts for Official Makita DCS540-21 chainsaw, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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Showing 10 of 194 parts  |
Chain 18" 523-102-064
#401

Cylinder, piston and accessories diagram

Chain 18"

Part #523-102-064

Replaced by #72V064G

?
Manufacturer substitution
This part replaces 523-102-064. Substitute parts can look different from the original.
$31.76
In Stock
Saw Chain 3/8" (dcs540-21) 523-102-072
#401A

Cylinder, piston and accessories diagram

Saw chain 3/8" (dcs540-21)

Part #523-102-072

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

Brake Spring 027-213-050
#22

Chain brake, hand guard diagram

Brake spring

Part #027-213-050

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

Safety Goggl 191686-2
#409

Cylinder, piston and accessories diagram

Safety goggl

Part #191686-2

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

Key 939-620-371
#5

Crankcase diagram

Key

Part #939-620-371

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

Spike Bar Assembly 020-250-020
#26

Crankcase diagram

Spike bar assembly

Part #020-250-020

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

Chain Cover 952-100-643
#404

Cylinder, piston and accessories diagram

Chain cover

Part #952-100-643

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

Felt 963-601-240
#19

Fuel tank, tubular grip diagram

Felt

Part #963-601-240

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

Throttle Lever 020-117-290
#23

Fuel tank, tubular grip diagram

Throttle lever

Part #020-117-290

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

Bottom 027-118-040
#8

Hood, air filter, muffler diagram

Bottom

Part #027-118-040

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

Symptoms for gas chainsaws

Choose a symptom to see related chainsaw repairs.

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Why won't my chainsaw start?

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

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Why does my chainsaw run roughly?

Main causes: bad gas, engine needs tune up, cracked fuel lines, dirty carburetor…

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What should I do if my chainsaw leaks gas?

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

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Repair guides for gas chainsaws

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

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How to rebuild a chainsaw carburetor

How to rebuild a chainsaw carburetor

If your chainsaw isn't running well, a dirty carburetor could be the problem. You can take it apart, clean it and rebuil…

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Repair difficulty
Time required
 15 minutes or less
How to replace chainsaw fuel lines

How to replace chainsaw fuel lines

The fuel line on a chainsaw becomes brittle over time and can crack. Replacing it doesn't require a lot of DYI experienc…

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

How to replace a chainsaw carburetor

If the engine won't start even though there's fuel in the chainsaw, the carburetor could be the problem. Sometimes, it's…

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Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your chainsaws

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

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What are the most common replacement parts for chainsaws?

What are the most common replacement parts for chainsaws?

Learn about the most common replacement parts for chainsaws and how they can help you fix chainsaw problems.…

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Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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