MTD 760, 779 Fins and blower housing, Spark plugs gap too close, High RPM Gap Idles poorly

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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.
Vibration			2.	Replace blade.
	2. Damaged or bent cutting 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.	Excessively high grass.	3.	Mow once at a high cutting height,
			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.
	2.	Dull blade.
	3.	Uneven tire pressure.	2. Sharpen or replace blade.
	3.	Uneven tire pressure.
			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.

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Contents 01/06/2006 MTD LLC, P.O. BOX 361131 CLEVELAND, OhioTable of Contents Slope Gauge Use only an approved gasoline container This power machine to persons who read, understandReplace gasoline cap and tighten securely General Operation Never allow children or others in or on towed equip- ment Do NotService Gas and Oil Fill-up Attaching the Battery CablesRemove the hex bolt and hex nut from the negative cable Attaching The Steering Wheel Shipping Brace RemovalAttaching The Seat Standard Adjustment SeatQuick Adjustment Seat Knob Adjustment SeatEquipped Identifying the Mulch Plug if soOperating Always disengage Ignition SwitchThrottle Control Lever Choke ControlShift Lever Safety Interlock SwitchesParking Brake Clutch-Brake PedalTo use the Reverse Caution Mode Reverse Caution Mode If EquippedModels without Reverse Caution Mode Models with Reverse Caution ModeStarting the Engine Setting the Cutting HeightStopping the Engine Place shift lever in Neutral Restart engine Driving The TractorMowing Using the Deck Lift LeverDriving On Slopes Engaging the BladesMulching If Equipped HeadlightsSide to Side Parking Brake AdjustmentLeveling the Deck Front To RearStandard Seat Seat AdjustmentKnob Adjustment Seat if so equipped Quick Adjust Seat If so equippedEngine Cleaning the Engine And DeckLubrication Deck Wash System Cutting Deck RemovalTo remove the cutting deck, proceed as follows Fuse BatteryBlades may be removed as follows Cutting BladesFoot-pounds Remount the belt guards removed earlier Changing the Deck Belt & PTO BeltChanging the Transmission Drive Belts Remove the belt keeper rod from around the engine pulleyMaintaining Your Lawn Tractor Twin Bagger Grass Collector for 38/42-inch Decks Rear Wheel Weight KitInch Two-stage Snow Thrower 38/42-inch Deck Mulch KitYour Responsibility Restrict the use Safety LabelsChoke not activated Spark plug wires loosePlug wires Fuel tank empty or stale fuelHigh RPM Gap Idles poorly Fins and blower housingToo wide Gap Dirty air cleaner Spark plugs gap too closePage Page Page MANUFACTURER’S Warranty Coverage MANUFACTURER’S Limited Warranty for