Troy-Bilt 77T Fins and blower housing, Spark plugs gap too close, High RPM Gap Idles poorly

Problem		Cause		Remedy
Engine overheats	1.	Engine oil level low.	1.	Fill crankcase with proper oil.
	2.	Air flow restricted.	2.	Clean grass clippings and debris
				from around the engine’s cooling
				fins and blower housing.
Engine hesitates at	1.	Spark plug(s) gap too close.	1.	Remove spark plug(s) and reset
high RPM				the gap.
Idles poorly	1.	Spark plug(s) fouled, faulty or gap	1.	Replace spark plug(s). Set plug(s)
		too wide.		gap.
	2.	Dirty air cleaner.	2.	Replace air cleaner cartridge/ele-
				ment or clean pre-cleaner, if so
				equipped.
Excessive	1.	Cutting blade loose or unbalanced.	1.	Tighten blade and spindle. Balance
Vibration				blade.
			2.	Replace blade.
	2. Damaged or bent cutting blade.
Mower will not	1.	Engine speed too low.	1.	Place throttle control in FAST
mulch grass (If	2.	Wet grass.		(rabbit) position.
Equipped)			2.	Do not mow when grass is wet;
	3.	Excessively high grass.		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.	Dull blade.	4.	Sharpen or replace blade.
Uneven cut	1.	Deck not balanced properly.	1.	Perform side-to-side deck adjust-
	2.	Dull blade.		ment.
	3.	Uneven tire pressure.	2.	Sharpen or replace blade.
			3.	Check tire pressure in all four tires.

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Trouble

Shooting

For repairs beyond the minor adjust- ments listed here, contact an authorized service dealer.

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