Troy-Bilt 77T Series Operator's Manual page 27

Problem
Engine overheats
Engine hesitates at
high RPM
Idles poorly
Excessive
Vibration
Mower will not
mulch grass (If
Equipped)
Uneven cut
Cause
1. Engine oil level low.
2. Air flow restricted.
1. Spark plug(s) gap too close.
1. Spark plug(s) fouled, faulty or gap
too wide.
2. Dirty air cleaner.
1. Cutting blade loose or unbalanced.
2. Damaged or bent cutting blade.
1. Engine speed too low.
2. Wet grass.
3. Excessively high grass.
4. Dull blade.
1. Deck not balanced properly.
2. Dull blade.
3. Uneven tire pressure.
27
Remedy
1. Fill crankcase with proper oil.
2. Clean grass clippings and debris
from around the engine's cooling
fins and blower housing.
1. Remove spark plug(s) and reset
the gap.
1. Replace spark plug(s). Set plug(s)
gap.
2. Replace air cleaner cartridge/ele-
ment or clean pre-cleaner, if so
equipped.
1. Tighten blade and spindle. Balance
blade.
2. Replace blade.
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. Perform side-to-side deck adjust-
ment.
2. Sharpen or replace blade.
3. Check tire pressure in all four tires.
9
Trouble
Shooting
For repairs beyond
the minor adjust-
ments listed here,
contact an authorized
service dealer.