Husqvarna 917.38451 owner manual Lawn Mower, Engine, Tires, Blade Care, Grass Catcher, Lubrication

LAWN MOWER						IMPORTANT: Blade bolt is heat treated.
Always observe safety rules when per-						If bolt needs replacing, replace only with
forming any maintenance.						approved bolt shown in the Repair Parts
TIRES						section of this manual.
•	Keep tires free of gasoline, oil, or insect					TO SHARPEN BLADE
						NOTE: We do not recommend sharp-
	control chemicals which can harm rubber.
						ening the blade - but if you do, be sure
•	Avoid stumps, stones, deep ruts, sharp
	objects and other hazards that may					the blade is balanced. An unbalanced
	cause tire damage.					blade will cause eventual damage to lawn
						mower or engine.
BLADE CARE
						• The blade can be sharpened with a file
For best results, mower blade must be kept
							or on a grinding wheel. Do not attempt
sharp. Replace bent or damaged blades.
							to sharpen while on the mower.
	CAUTION: Use only a replacement
						• To check blade balance, drive a nail into
blade approved by the manufacturer of
							a beam or wall. Leave about one inch of
your mower. Using a blade not approved
							the straight nail exposed. Place center
by the manufacturer of your mower is
							hole of blade over the head of the nail.
hazardous, could damage your mower and
							If blade is balanced, it should remain in
void your warranty.
							a horizontal position. If either end of the
TO REMOVE BLADE							blade moves downward, sharpen the
1. Disconnect spark plug wire from spark							heavy end until the blade is balanced.
		plug and place wire where it cannot				GRASS CATCHER
		come in contact with plug.				• The grass catcher may be hosed with
2. Turn lawn mower on its side. Make							water, but must be dry when used.
		sure air filter and carburetor are up.				• Check your grass catcher often for dam-
3. Use a wood block between blade and							age or deterioration. Through normal
		mower housing to prevent blade from					use it will wear. If catcher needs replac-
		turning when removing blade bolt.					ing, replace only with approved replace-
NOTE: Protect your hands with gloves							ment catcher shown in the Repair Parts
and/or wrap blade with heavy cloth.							section of this manual. Give the lawn
4. Remove blade bolt by turning counter-							mower model number when ordering.
		clockwise.				ENGINE
5. Remove blade and attaching hardware
						LUBRICATION
		(bolt, lock washer and hardened washer).
TO REPLACE BLADE						Use only high quality detergent oil rated
						with API service classification SJ–SL.
1. Position blade on the blade adapter
						Select the oil's SAE viscosity grade according
		aligning the two (2) holes in the blade
						to your expected operating temperature.
		with the raised lugs on the adapter.
2. Be sure the trailing edge of blade (oppo-
		site sharp edge) is up toward the engine.
3. Install the blade bolt with the lock
		washer and hardened washer into
		blade adapter and crankshaft.
4. Use block of wood between blade and
		lawn mower housing and tighten the
		blade bolt, turning clockwise.
•	The recommended tightening torque is
						Change the oil after every 25 hours of
	35-40 ft. lbs.
Blade adapter				Key	Crankshaft	operation or at least once a year if the
						lawn mower is not used for 25 hours in
					keyway
Lockwasher						one year.
						Check the crankcase oil level before
			Blade			starting the engine and after each five (5)
						hours of continuous use. Tighten oil plug
						securely each time you check the oil level.
						TO CHANGE ENGINE OIL
Blade						NOTE: Before tipping lawn mower to
						drain oil, empty fuel tank by running en-
bolt Hardened
					Crankshaft 12gine until fuel tank is empty.
			washer	Trailing edge