Lawn Mower, Engine | Husqvarna 55B21HV specs

MAINTENANCE

LAWN MOWER

Always observe safety rules when performing any main- tenance.

TIRES

•Keep tires free of gasoline, oil, or insect control chem- icals which can harm rubber.

•Avoid stumps, stones, deep ruts, sharp objects and other hazards that may cause tire damage.

DRIVE WHEELS

Check rear drive wheels each time before you mow to be sure they move freely.

The wheels not turning freely means trash, grass cuttings, etc. are in the drive wheel area and must be cleaned to free drive wheels.

If necessary to clean the drive wheels, be sure to clean both rear wheels.

BLADE CARE

For best results, mower blade must be kept sharp. Replace bent or damaged blades.

TO REMOVE BLADE (See Fig. 18)

1.Disconnect spark plug wire from spark plug and place wire where it cannot come in contact with spark plug.

2.Turn lawn mower on its side. Make sure air ﬁ lter and carburetor are up.

3.Use a wood block between blade and mower housing to prevent blade from turning when removing blade bolts.

NOTE: Protect your hands with gloves and/or wrap blade with heavy cloth.

4. Remove blade bolts by turning counter-clockwise.

TO REPLACE BLADE (See Fig. 18)

1.Position the blade and spacer. Be sure the trailing edge of blade (opposite sharp edge) is up toward the engine and install the blade bolts.

2.Use block of wood between blade and lawn mower hous- ing and tighten the blade bolts, turning clockwise.

•The recommended tightening torque is 36-44 ft. lbs.

IMPORTANT: BLADE BOLTS ARE HEAT TREATED. IF BOLTS NEED REPLACING, REPLACE ONLYWITH APPROVED BOLTS SHOWN IN REPAIR PARTS SECTION OF THIS MANUAL.

TRAILING EDGE

SPACER

BLADE

BOLTS

TO SHARPEN BLADE

NOTE: We do not recommend sharpening blade - but if you do, be sure the blade is balanced.

Care should be taken to keep the blade balanced. An unbalanced blade will cause eventual damage to lawn mower or engine.

•The blade can be sharpened with a ﬁ le or on a grind- ing wheel. Do not attempt to sharpen while on the mower.

•To check blade balance, drive a nail into a beam or wall. Leave about one inch of the straight nail exposed. Place center hole of blade over the head of the nail. If blade is balanced, it should remain in a horizontal position. If either end of the blade moves downward, sharpen the heavy end until the blade is balanced.

GRASS CATCHER

•The grass catcher may be hosed with water, but must be dry when used.

•Check your grass catcher often for damage or dete- rioration. Through normal use it will wear. If catcher needs replacing, replace only with approved replace- ment catcher shown in the Repair Parts section of this manual. Give the lawn mower model number when ordering.

ENGINE

LUBRICATION

Use only high quality detergent oil rated with API service classiﬁ cation SF-SJ. Select the oil's SAE viscosity grade according to your expected operating temperature.

NOTE: Multi-viscosity oils (5W30, 10W30 etc.) improve starting in cold weather, and you should check your engine oil level frequently to avoid possible engine damage from running low on oil.

Change the oil after every 25 hours of operation or at least once a year if the lawn mower is not used for 25 hours in one year.

Check the crankcase oil level before starting the engine and after each ﬁ ve (5) hours of continuous use. Tighten oil plug securely each time you check the oil level.

FIG. 18