Troy-Bilt 77T Manuel D’Utilisation

Engine overheats

1.  Fill crankcase with proper oil.
2.  Clean grass clippings and debris 

from around the engine’s cooling 
fins and blower housing.

1.  Engine oil level low.
2.  Air flow restricted.

Engine hesitates at 

high RPM

1.  Remove spark plug(s) and reset 

the gap.

1.  Spark plug(s) gap too close.

Idles poorly

1.  Replace spark plug(s). Set plug(s) 

gap.

2.  Replace air cleaner cartridge/ele-

ment or clean pre-cleaner, if so 
equipped.

1.  Spark plug(s) fouled, faulty or gap  

too wide.

2.  Dirty air cleaner.

Mower will not  

mulch grass (If 

Equipped)

1.  Place throttle control in FAST 

(rabbit) position.

2.  Do not mow when grass is wet; 

wait until later to cut.

3.  Mow once at a high cutting height, 

then mow again at desired height 
or make a narrower cutting path.

4.  Sharpen or replace blade. 

1.  Engine speed too low.
2.  Wet grass.

3.  Excessively high grass.

4.  Dull blade.

Uneven cut

1.  Perform side-to-side deck adjust-

ment.

2.  Sharpen or replace blade.
3.  Check tire pressure in all four tires.

1.  Deck not balanced properly.
2.  Dull blade.
3.  Uneven tire pressure.

Excessive

Vibration

1.  Cutting blade loose or unbalanced.

2.  Damaged or bent cutting blade.

1.  Tighten blade and spindle. Balance 

blade.

2.  Replace blade.