Ariens 911094 - Pro 21SCH User Manual download pdf (Page 16)

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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 9).

4. Install mower blade on unit.

5. Tighten the bolts to a torque of 37.5 -

50 lbf-ft (51-68 N•m).

CHECK DRIVE BELT (self-

propelled models)

Check drive belt and replace if worn or

damaged. See Drive Belt Replacement (self-

propelled models) on page 19.

CHECK FASTENERS

Check all fasteners for proper tightness. Pay

special attention to blade hardware and all

guards, shields and safety devices.

CHECK AIR CLEANER

See engine manual for specific information.

CHANGE ENGINE OIL

IMPORTANT: Change engine crankcase oil

after first five (5) hours of operation. Then

change oil after every 25 hours of operation.

Refer to engine manual for instructions and

proper oil type.

IMPORTANT: Proper oil level must be

maintained at all times or engine damage will

result. DO NOT overfill. Be sure engine is

level when adding oil.

GENERAL LUBRICATION

NOTE: LM21SCH has lube fittings on drive

mount for use in commercial applications.

Lubricate as needed.

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 8

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 9

OA0013

Bolt

Blade

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 25 26

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