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Craftsman 917.28722 Operator's Manual page 31

21.0 hp 42"' mower electric start automatic transmission

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TROUBLESHOOTING
CHART:
See appropriate
section
in manual
unless
directed
to Sears
service
center
_ROBLEM
CAUSE
CORRECTION
Mower
blades
will
not rotate
Poor grass
discharge
Headlight(s)
not
working
(if so equipped)
Battery
will not
charge
1.
Obstruction
in clutch
mechanism.
2.
Worn/damaged
mower
drive
belt,
3.
Frozen
idler pulley,
4.
Frozen
blade
mandrel,
5.
Mower
belt off engine
pulley.
1.
Engine
speed
too slow.
2.
Travel speed
too fast.
3.
Wet grass.
4.
Mower
not level.
5.
Low/uneven
tire air pressure.
6.
Worn,
bent or loose
blade.
7.
Buildup
of grass,
leaves
and
trash
under
mower.
8.
Mower
drive
belt worn.
9.
Blades
improperly
installed.
10. Improper
blades
used.
11. Clogged
mower
vent
holes
from buildup
of grass,
leaves,
and trash around
mandrels.
1.
Light switch
is "OFF".
2.
Bulb(s) or lamp(s) burned out.
3.
Faulty
light switch.
4.
Loose
or damaged
wiring.
5.
Blown
fuse.
1.
Bad battery
cell(s).
2.
Poor cable
connections.
3.
Faulty
regulator
(if so equipped).
4.
Faulty
alternator.
il.
Remove
obstruction.
2.
Replace
mower
drive
belt.
13. Replace
idler pulley.
4.
Contact
a Sears
or other
qualified
service
center.
13. Install
belt on engine
pulley.
11.
Place
throttle
control
in
"FAST"
position.
12, Shift to slower
speed,
13. Allow
grass to dry before
mowing,
14. Level
mower,
5.
Check
tires for proper
air
pressure,
16. Replace/sharpen
blade,
Tighten
blade
bolt,
i7.
Clean
underside
of mower
housing,
i8.
Replace
mower
drive belt,
i9.
Reinstall
blades
sharp
edge
down,
i 10. Replace
with blades
listed
in this manual,
i 11. Clean
around
mandrels
to
open vent holes,
11. Turn light switch
"ON".
12. Replace
bulb(s)
or lamp(s).
3.
Check/replace
light switch.
14. Check wiring and connections,
15. Replace
fuse.
11. Replace battery.
12. Check/clean
all connections.
i3. Replace regulator.
4.
Replace
alternator.
Loss of drive
Engine
"backfires'
when
turning
engine
"OFF"
1.
Freewheel
control
in
"disengaged"
position.
2.
Motion
drive
belt worn,
damaged,
or broken.
3.
Air trapped
in transmission
during
shipment
or servicing.
,
Engine
throttle
control
not set
between
half and full speed
(fast) position
before
stopping
engine,
il.
Place
freewheel
control
in
"engaged"
position.
2.
Replace
motion
drive
belt,
13. Purge
transmission.
il.
Move throttle
control
between
half and full speed
(fast)
position
before
stopping
engine,
31

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