Part Location Diagram of 791-180350B MTD Filter, Air Cleane
See part A-2 in the diagram
Replacing your MTD Trimmer Filter, Air Cleane
( Grid squares measure 1x1 inch )

Filter, Air Cleane 791-180350B

Manufactured by:
MTD
ERP Number:
ERP9137666
Part Number:
791-180350B
Original Equipment Manufacturer ?
In Stock
Delivers in 3-5 Business Days!

Easy 

15 - 30 mins 

(19 rated repairs) ?

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Product Description

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This is an OEM replacement part and is sold individually. Its purpose is to filter out dust and debris from contaminating the carburetor and engine. When replacing the filter you can open the package in comes in and put a bit of two cycle oil in the bag and let it absorb into the filter. Then remove it from the bag and squeeze it with a paper towel to remove the excess oil. This will aid the filter in filtering out the unwantables.

Troubleshooting

This part works with the following brands:
  • MTD
  • Ryobi
  • Troy-Bilt
  • Craftsman
  • Yard Man
  • Bolens
  • Yard Machines
  • Murray
This part works with the following products:
  • Trimmer
  • Leaf Blower / Vacuum
  • Tiller
  • Cultivator
Part# 791-180350B replaces these:
791-180350, 791-180350B, 791-92-3201,

Videos For installing this part.

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Replacing your Filter, Air Cleane

Customer Part Reviews

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Customer Repair Instructions

All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.

Easy 

15 - 30 mins 

(19 rated repairs) ?
  • 1
  • 2
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Sorry, we couldn't find any existing installation instruction that matched.

Fuel line was cracked and leaking, and general tuneup needed.

Mike from Fairfax, Iowa

8 of 8 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers, Socket set, Wrench set
I replaced the fuel line/filter first. Removing the old filter was a chore because of the tight fit of the barbs on the filter. Pushing it out with the pliers, little by little, worked well. The new fuel line/filter did not fit well into the hole, so i used a drill bit of the same size as the hole & carefully reamed out the inside of the hole by hand (the plastic fuel tank) so i could get it started through the hole. Tight working space. I used a flat screwdriver to push the filter down into place - inserted through the fuel tank opening - as well as gently pulling on the line & took some work to get it fully seated.
Replacing the air cleaner filter and spark plug were simple and quick. There were 4 torx head screws to remove the cover. The screws also have a slot for a straight-blade screwdriver, but it was worth it to get the Torx set.
Replacing the auto feed line assembly was straightforward, except there is a somewhat hidden setscrew on the inside of the shaft that must be removed. No replacement instructions came with the assembly, so I struggled with removing the old one before finding the setscrew. Once I removed it, the assembly removal and replacement was quick and easy.
The trimmer starts, runs, and doesn\'t leak.
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Fuel lines rotten

Tim from Rio Linda, California

4 of 4 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers
1. Remove engine cover
2. Remove old lines
3. Install new lines
4. Replace air filter
5. Replace engine cover
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Would not start

Mike from Rockledge, Pennsylvania

4 of 4 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers
Used the videos on your website. Never did this before. Easy- peasy. Thanks for the help and parts.
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Trimmer idled fine but died when throttle applied.

Jeffrey from Estacada, Oregon

3 of 3 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Nutdriver, Pliers
Parts Used:
753-04233, 791-180350B
1. I first disassembled the air cleaner from the machine and gave it a cleaning.
2. Removed the carb and throttle connection.
3. Removed fuel lines and fuel tank.
4. Installed new fuel lines. Couldn\'t thread the new line thru hole in the tank since it was on opposite end of tank fill. So, I cut the line in the tank with the fuel filter and used a splice in the tank. Worked well.
5. Went ahead and bought a new carb for $12.99 and installed.
Hooked new lines to carb and new primer bulb.
6. Installed new air filter and put it all back together.
7. Works great, after slight adjustment of the idle screw.
8. No more ethanol fuel for me.
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Replace fuel filter in tank, replace plug and install new air filter.

ROY from LAS CRUCES, New Mexico

3 of 3 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers, Socket set, Wrench set
Removed fuel tank and cleaned all areas of the trimmer. Installed new fuel filter and gas line. Installed new spark plug and air filter.
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Gas leaks

Rocco from Hermitage, Pennsylvania

2 of 2 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Pliers, Screw drivers
Removed the gas tank and replaced the gas filter and hoses. Also replaced the air cleaner and the primer bulb. The gas filter was somewhat difficult to replace because it must be seated very tightly and there is a retaining clip on the outside to insure a good seal. I had to enlarge the hole in the gas tank as it was too small to fit the new filter nozzle that the hose is attached to.
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Fuel lines cracked and clogged fuel filter

charles from Niagara Falls, New York

2 of 2 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Replaced fuel filter and all fuel lines.
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Broken trigger, air filter, hand grip

timothy from walled lake, Michigan

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
I took out all of the screws from the handle where the trigger is located. I made sure how the spring and trigger were placed in the handle. I removed the broken trigger and took out the cable. I took the new trigger, put the cable in it and put it and the spring in the handle. And put the handle together. I used some soapy water to slid e on the grip. I took out the screws that hold the filter cover and took out the old filter and put in the new one. Then put the cover back on.
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Leaking fuel lines

Randy from Harleysville, Pennsylvania

0 of 1 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
15 - 30 mins
Tools:
Nutdriver, Pliers, Screw drivers, Socket set, Wrench set
Removed old fuel lines
Re-installed new fuel lines
Replaced air filter
Replaced spark plug
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Starter rope wouldn\'t recoil and the other was the engine was running ruff and stalls and only running on choke.

Mark from MIDDLETOWN, Ohio

0 of 1 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Pliers, Screw drivers, Socket set, Wrench set
Replace the whole start system and replace the whole carburator part\'s and for good measure I have replaced the reel and the job wet well and the trimmer is running like new condition.
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Model Cross Reference

This part works with the following models:
ERP Number: ERP9137666
Manufacturer Part Number: 791-180350B
Brand Model Number Description
Yard Man 121R Tiller - (21A-900) Tiller
Yard Man 122R Tiller - (21AB901) Tiller
MTD 21A-120R000 Tiller - Tiller
MTD 21A-121R034 Tiller - MTD Tiller Model 21A-121R034 (21A121R034, 21A 121R034) Parts
Yard Machines 21A-121R129 Tiller - Yard Machines Tiller Model 21A-121R129 (21A121R129, 21A 121R129) Parts
MTD 21A-121R700 Tiller - MTD Tiller Model 21A-121R700 (21A121R700, 21A 121R700) Parts
MTD 21A-121R900 Tiller - MTD Tiller Model 21A-121R900 (21A121R900, 21A 121R900) Parts
MTD 21A-121R965 Tiller - MTD Tiller Model 21A-121R965 (21A121R965, 21A 121R965) Parts
MTD 21AB122R901 Tiller - MTD Tiller Model 21AB122R901 Parts
MTD 21AK121G931 Tiller - MTD Tiller Model 21AK121G931 Parts
MTD 21AK410G034 Tiller - MTD Tiller Model 21AK410G034 Parts
MTD 21AK410G163 Tiller - MTD Tiller Model 21AK410G163 Parts
MTD 21AS122R799 Tiller - MTD Tiller Model 21AS122R799 Parts
MTD 21B-120R000 Tiller - MTD Tiller Model 21B-120R000 (21B120R000, 21B 120R000) Parts
MTD 21B-121R765 Tiller - MTD Tiller Model 21B-121R765 (21B121R765, 21B 121R765) Parts
MTD 21BK410G034 Tiller - MTD Tiller Model 21BK410G034 Parts
MTD 21BK410G163 Tiller - MTD Tiller Model 21BK410G163 Parts
MTD 21BS122R799 Tiller - MTD Tiller Model 21BS122R799 Parts
MTD 21C-120R000 Tiller - MTD Tiller Model 21C-120R000 (21C120R000, 21C 120R000) Parts
MTD 21CK410G034 Tiller - MTD Tiller Model 21CK410G034 Parts
MTD 21CS122R799 Tiller - MTD Tiller Model 21CS122R799 Parts
MTD 21DK410G034 Tiller - MTD Tiller Model 21DK410G034 Parts
MTD 21DS122R799 Tiller - MTD Tiller Model 21DS122R799 Parts
MTD 21EK410G034 Tiller - MTD Tiller Model 21EK410G034 Parts
MTD 21ES122R799 Tiller - MTD Tiller Model 21ES122R799 Parts
MTD 21FK410G034 Tiller - MTD Tiller Model 21FK410G034 Parts
Craftsman 247292560 Cultivator - Cultivator
Ryobi 2800M Trimmer - Trimmer
Yard Machines 2800MVP Trimmer - Yard Machines String Trimmer Model 2800MVP Parts
Ryobi 2800R Trimmer - Trimmer