Check Grass Bag; Check Drive Control; General Lubrication; Check Drive Belt - Scotts 907254 - LM21SW Operating And Parts Manual

4. Install blade, lock washer and tighten cap screw
until lock washer is fully compressed (requires
25-30 ft. lbs. of torque on nuts).
IMPORTANT: If mower is used under sandy soil
conditions, replace blades when air lifts become
eroded.
Mulching Blade
Standard Blade
3
2
1. Cutting Edge
2. Square Corner
3. Air Lift Erosion
4. Air Lift

CHECK DRIVE BELT

4
3
1. Blade
2. Cap Screw, Lock Washer & Flat Washer
3. Drive Belt
4. Idler
Check drive belt for wear or damage. Replace belt if
worn or damaged. See Service and Adjustments.
5
4
1
2
4
1
5. Reverse Lift
Figure 10
1
Figure 11
CHECK ENGINE/BLADE CONTROL
The engine/blade control must stop the engine and
blade within 3 seconds after the bail is released. If the
engine or blade continues to run, adjust or repair
control immediately. See Adjustments.

CHECK GRASS BAG

Check bag for wear or damage. Keep bag clean and
dry. Replace only with Ariens original equipment
replacement bag.
3

CHECK DRIVE CONTROL

Check operation of drive control. The drive must
disengage completely when the bail handle is
released. Adjust bail travel if necessary. See
OM0230
Adjustments.

GENERAL LUBRICATION

Mower does not require any lubrication. Wheel
assemblies are designed for long life without additional
lubrication.
Swivel Lubrication
OM0240
See Figure 12.
NOTE: Linchpin must be in the swivel lock hole while
lubricating.
1
2
1. Grease Fitting
CHECK FASTENERS
OM0250
Check all fasteners for proper tightness. Pay special
attention to blade hardware and all guards, shields and
safety devices.

CHECK SPARK PLUG

Spark plug should be cleaned (or replaced) if
necessary and gap reset to .030" every 100 hours of
operation or yearly, whichever comes first.
To clean:
1. Remove debris from area around spark plug
base.
2. Remove spark plug from engine.
16
(swivel units)
2
2. Swivel Lock Hole
Figure 12
OM0180