Troy-Bilt 550 Series User Manual (English)

Questions and Answers:

F
fevansAug 1, 2025
How to fix Troy-Bilt 550 engine that fails to start?
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  daleclarkAug 2, 2025
  If your Troy-Bilt Lawn Mower engine won't start, possible causes include an empty fuel tank, stale fuel, a disconnected spark plug wire, or a fouled spark plug. Try filling the tank with fresh gasoline, connecting the spark plug wire, or cleaning, adjusting, or replacing the spark plug. Also, the engine may need to be primed by pushing the primer bulb two or three times if equipped. For dirty air cleaner or flooded engine, refer to the Engine Operator’s Manual.
B
bradleyburkeAug 6, 2025
Why does my Troy-Bilt 550 engine run erratic?
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  Joseph ShortAug 6, 2025
  If your Troy-Bilt Lawn Mower engine runs erratically, it might be due to a loose spark plug wire, stale fuel, a plugged vent in the gas cap, or water/dirt in the fuel system. Ensure the spark plug wire is connected and tightened. Drain the gasoline tank and refill with fresh fuel. Clear the vent in the gas cap of any debris. For a dirty air cleaner, refer to the Engine Operator’s Manual.
D
Darlene HooverAug 11, 2025
What to do if Troy-Bilt 550 Lawn Mower drive-belt slips?
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  Nicole ColemanAug 11, 2025
  If the drive-belt slips on your Troy-Bilt Lawn Mower, it is likely worn or stretched and needs to be replaced.
G
George AndersonAug 16, 2025
What to do if my Troy-Bilt Lawn Mower engine overheats?
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  Mark ChavezAug 16, 2025
  If your Troy-Bilt Lawn Mower engine overheats, check the engine oil level and add oil if it is low. Also, ensure that there is no restriction of airflow around the engine by cleaning the area around and on top of the engine. For a dirty air cleaner, refer to the Engine Operator’s Manual.
S
Sarah SmithAug 21, 2025
Why Troy-Bilt 550 idles poorly?
- A
  ashley85Aug 21, 2025
  If your Troy-Bilt Lawn Mower idles poorly, the spark plug may be fouled, faulty, or have a gap that is too wide. Reset the gap or replace the spark plug. For a dirty air cleaner, refer to the Engine Operator’s Manual.
M
Mr. Jordan ThomasAug 27, 2025
Why Troy-Bilt 550 Lawn Mower has occasional skips at high speed?
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  John GravesAug 27, 2025
  If your Troy-Bilt Lawn Mower experiences occasional skips (hesitates) at high speed, the spark plug gap might be too close. Adjust the gap, referring to the Engine Operator’s Manual for gap specifications.

Troy-Bilt 550 Series Specifications

General

Engine Displacement	140cc
Deck Material	Steel
Mulch Capable	Yes
Side Discharge	Yes
Rear Bag	Yes
Cutting Width	21 inches
Cutting Height	1.25 - 3.75 in
Wheel Size	7 inches front, 10 inches rear