Gas Line Trimmer

Model # MAC284S 12-400128-86 Official McCulloch trimmer

Here are the diagrams and repair parts for Official McCulloch MAC284S 12-400128-86 trimmer, as well as links to manuals and error code tables, if available.

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Browse Parts for
MAC284S 12-400128-86 Line Trimmers
Dm/rpe A 222869
#13

Starter housing assembly diagram

Dm/rpe a

Part #222869

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

Hsg/eyelet A 300091
#17

Shaft/shield assembly diagram

Hsg/eyelet a

Part #300091

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

Decal 223407
#5

Shaft/shield assembly diagram

Decal

Part #223407

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

Sparkplug Rd 92879
#63A

Powerhead assembly diagram

Sparkplug rd

Part #92879

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

Screw,6-19x. 111061
#2

Starter housing assembly diagram

Screw,6-19x.

Part #111061

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

Washer 322210
#59

Powerhead assembly diagram

Washer

Part #322210

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

Screw 111072
#5

Powerhead assembly diagram

Screw

Part #111072

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

Plug 300119
#21

Starter housing assembly diagram

Plug

Part #300119

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

Piston 300661
#49

Powerhead assembly diagram

Piston

Part #300661

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

Muffler 224228
#6

Powerhead assembly diagram

Muffler

Part #224228

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.

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

Main causes: stale fuel, clogged fuel filter, faulty spark plug, clogged air filter, cracked fuel lines, clogged carbure…

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

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.

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…

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 …

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…

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.

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…

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.…

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…