Ariens 911134 - LM21SW User Manual download pdf (Page 16)

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To install blade:

1. Replace blade, flat washer, lock washer

and bolt on shaft.

2. Torque bolt to 37.5 - 50 lbf-ft

(51-68 N•m) (bolt should fully compress

lock washer).

3. Connect spark plug wire.

Sharpen the Mower Blades

1. Remove mower blade from unit.

Discard mower blade if:

• More than 1/2 in. (1.27 cm) of metal is

removed.

• Air lifts become eroded.

• Blade is bent or broken.

2. Sharpen mower blade by removing an

equal amount of material from each end

of mower blade. DO NOT change angle

of cutting edge or round the corner of the

mower blade.

3. Check mower blade balance.

Slide mower blade on an unthreaded

bolt. A balanced blade should remain in

a horizontal position. If either end of

mower blade moves downward, sharpen

the heavy end until blade is balanced

(Figure 10).

4. Install mower blade on unit.

5. Tighten the bolts to a torque of 37.5 -

50 lbf-ft (51-68 N•m).

CAUTION: DO NOT sharpen

mower blades while on unit. An

imbalanced mower blade will

cause excessive vibration and

eventual damage to unit. Check

mower blade balance before

reinstalling blades.

NEVER weld or straighten bent

blades.

Figure 9

1. Square Corner

2. Cutting Edge

3. Air Lift

4. Air Lift Erosion

Sharpen to This Pattern

DO NOT Sharpen to This Pattern

DISCARD If More

Than 1/2 in. (1.27 cm)

2

1

3

2

3

4

OT0792

Figure 10

OA0013

Bolt

Blade

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 27 28

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