Can’t find your part?   Contact us:
+1-309-603-4777
Sears Parts Direct
Tips to find your model number
Orders

  • Keep track of the models you own in your profile

    Sign in or Register to view or add models

Schedule a repair
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.

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.

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
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
Crankshaft 027-120-010
#3

Crankcase diagram

Crankshaft

Part #027-120-010

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

Air Valve Cpl. 957-114-010
#20

Fuel tank, tubular grip diagram

Air valve cpl.

Part #957-114-010

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

Cramp 020-111-070
#39

Crankcase diagram

Cramp

Part #020-111-070

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

Rewind Spring 020-163-031
#6

Ignition electronics, starter diagram

Rewind spring

Part #020-163-031

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

Short-circuit Switch Cpl. 957-605-112
#32

Crankcase diagram

Short-circuit switch cpl.

Part #957-605-112

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

Hex. Nut M8 923-208-004
#35

Chain brake, hand guard diagram

Hex. nut m8

Part #923-208-004

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

Screw M5x20 908-005-205
Screw m5x20

Part #908-005-205

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

Fan Housing Cpl. 020-112-630
#2

Ignition electronics, starter diagram

Fan housing cpl.

Part #020-112-630

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

Snow Filter 957-112-160
#407

Cylinder, piston and accessories diagram

Snow filter

Part #957-112-160

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.

View all

Why won't my chainsaw start?

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

Read more

Why does my chainsaw run roughly?

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

Read more

What should I do if my chainsaw leaks gas?

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

Read more

Repair guides for gas chainsaws

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

View all
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…

Read more
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…

Read more
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…

Read more
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.

View all
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.…

Read more
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.…

Read more

Parts & More