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Solo
Gas Chainsaw

Model # 644 Official Solo gas chainsaw

Here are the diagrams and repair parts for Official Solo 644 gas 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 264 parts  |
Chain 15" 6900875S
#180B

Chain saw engine diagram

Chain 15"

Part #6900875S

Replaced by #20BPX067G

?
Manufacturer substitution
This part replaces 6900875S. Substitute parts can look different from the original.
$32.73
In Stock
Chain 13" 6900908
#180

Chain saw engine diagram

Chain 13"

Part #6900908

Replaced by #21BPX056G

?
Manufacturer substitution
This part replaces 6900908. Substitute parts can look different from the original.
$28.18
In Stock
Chain 15" 6900881
#180A

Chain saw engine diagram

Chain 15"

Part #6900881

Replaced by #21BPX064G

?
Manufacturer substitution
This part replaces 6900881. Substitute parts can look different from the original.
$31.31
In Stock
Bar 15" 6900464
#175A

Chain saw engine diagram

Bar 15"

Part #6900464

Replaced by #158PXLBK095

?
Manufacturer substitution
This part replaces 6900464. Substitute parts can look different from the original.
$62.44
In Stock
Bar 15" 6900343
#175B

Chain saw engine diagram

Bar 15"

Part #6900343

Replaced by #160VXLGK095

?
Manufacturer substitution
This part replaces 6900343. Substitute parts can look different from the original.
$62.56
In Stock
Bar, 18-in 6900861
#175C

Chain saw engine diagram

Bar, 18-in

Part #6900861

Replaced by #180VXLGK095

?
Manufacturer substitution
This part replaces 6900861. Substitute parts can look different from the original.
$66.96
In Stock
Bar 13" 6900500
#175

Chain saw engine diagram

Bar 13"

Part #6900500

Replaced by #138PXLBK095

?
Manufacturer substitution
This part replaces 6900500. Substitute parts can look different from the original.
$58.04
In Stock
Hose 2700321
#70

Handle bar diagram

Hose

Part #2700321

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

Piston Ring (644) 2048265
#121

Chain saw engine diagram

Piston ring (644)

Part #2048265

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

Piston (651 2200244
#120A

Chain saw engine diagram

Piston (651

Part #2200244

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…

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.

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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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