Manual Husqvarna 6521RS - 650 Series Briggs and Stratton Engine (page 13 of 23) (English)

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LAWN MOWER

Always observe safety rules when per-

form ing any main te nance.

TIRES

• Keep tires free of gasoline, oil, or insect

control chemi cals 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 be fore

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, blade must be kept

sharp. Re place a bent or dam aged blade.

CAUTION: Use only a replacement

blade approved by the manufacturer of

your mower. Using a blade not approved

by the manufacturer of your mower is haz-

ardous, could damage your mower and

void your warranty.

TO REMOVE BLADE

1. Disconnect spark plug wire from spark

plug and place wire where it cannot

come in contact with 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 hous ing to prevent blade from

turning when re mov ing blade bolt.

NOTE: Protect your hands with gloves

and/or wrap blade with heavy cloth.

4. Remove blade bolt by turning counter-

clockwise.

5. Remove blade & attaching hard ware

(bolt, lock wash er & hardened wash er).

TO REPLACE BLADE

1. Position blade on the blade adapter

aligning the two (2) holes in the blade

with the raised lugs on the adapter.

2. Be sure the trailing edge of blade (oppo-

site sharp edge) is up toward 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

35-40 ft. lbs.

IMPORTANT: Blade bolt is heat treated.

If bolt needs replacing, replace only with

approved bolt shown in the Repair Parts

section of this manual.

Blade

bolt

Crankshaft

keyway

Hardened

washer

Lockwasher

Blade adapter Key

Blade

Trailing edge

Crankshaft

TO SHARPEN BLADE

NOTE: We do not recommend sharp-

en ing the blade - but if you do, be sure the

blade is balanced. An un bal anced blade

will cause eventual damage to mower or

engine.

• The blade can be sharp ened with a ﬁ le

or on a grinding 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 ex posed. 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 dam-

age or de te ri o ra tion. Through normal

use it will wear. If catcher needs replac-

ing, replace only with ap proved replace-

ment catcher shown in the Repair Parts

section of this manual. Give the lawn

mower model number when ordering.

GEAR CASE

• To keep your drive system working

properly, the gear case and area around

the drive should be kept clean and free

of trash build-up. Clean under the drive

cover twice a season.

• The gear case is ﬁ lled with lubricant to

the proper level at the factory. The only

time the lubricant needs attention is if

service has been performed on the gear

case.

• If lubricant is required, use only Texaco

Starplex Pre mi um 1 Grease, Part No.

750369. Do not substitute.

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Husqvarna 6521RS - 650 Series Briggs and Stratton Engine Manual

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