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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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ALL PARTS
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
Cover Plate 027-213-111
#25

Chain brake, hand guard diagram

Cover plate

Part #027-213-111

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

Screw M5x62 (2) 908-205-625
#38

Hood, air filter, muffler diagram

Screw m5x62 (2)

Part #908-205-625

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

Gasket 963-100-050
#36

Crankcase diagram

Gasket

Part #963-100-050

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

Pump Drive 027-245-010
#3

Oil pump diagram

Pump drive

Part #027-245-010

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

Pre-filter 020-173-011
#28

Crankcase diagram

Pre-filter

Part #020-173-011

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

Hex. Nut M8x1 920-308-024
#21

Ignition electronics, starter diagram

Hex. nut m8x1

Part #920-308-024

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

Friction Ball 118-151-170
#16

Carburetor diagram

Friction ball

Part #118-151-170

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

Shaft For Brake Lever 027-213-130
#31

Chain brake, hand guard diagram

Shaft for brake lever

Part #027-213-130

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

Guide Disc 001-182-060
#38

Oil pump diagram

Guide disc

Part #001-182-060

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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