Yard Machines 840 Thru 849 사용자 설명서

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Engine will 
not crank

Safety switch 
button not 
depressed.
Battery installed 
incorrectly.

Battery is dead 
or weak.
Blown fuse or 
circuit breaker.

Engine ground 
wire loose.

There are two switches in the starting circuit of your unit: the clutch pedal switch and 
the deck lift lever switch. Make certain the actuator is fully depressing the buttons on 
each switch.
The battery must be installed with negative terminal attached to black ground wire. 
Negative terminal is identified at the post by “NEG”, “N” or “-”. The positive terminal, 
identified by “POS”, “P” or “+”, must be attached to the big red wire which goes to the 
solenoid. All batteries are to be fully charged before installing. Refer to “Quick Start” 
battery guide that came with the operator’s manual.
Check fluid level in battery. If fluid is low, fill to just below split rings with water. Charge 
with 6 AMP charger until fully charged.
Refer to operator’s manual for fuse box location. Replace fuse with automotive type 
fuse. Fuses seldom fail without a reason. The problem must be corrected. Check for 
loose connections in the fuse holder. Replace fuse holder if necessary. A dead short 
may be in the cranking or charging circuit where the insulation may have rubbed 
through and exposed the bare wire. Replace the wire or repair with electrician's tape if 
the wire strands have not been damaged.
Note: Look for a wire pinched between body panels, burned by the exhaust pipe or 
muffler or rubbed against a moving part.
Engine should have a black ground wire running from engine to frame or mounting 
bolt.

Engine 
cranks but 
will not start

Throttle or choke 
not in starting 
position. 
No fuel to the 
carburetor.

No spark to 
spark plug.

Dirty air cleaner.

Check operator's manual for correct position for throttle control and choke for starting.

Gasoline tank empty. Fill tank.
Fuel line or in-line fuel filter plugged. Remove and clean fuel line. Replace filter if
necessary.
Spark plug lead disconnected. Connect lead. Hold spark plug lead away from engine 
block about 1/8". Crank engine. There should be a spark. If not, have engine repaired 
at authorized engine service dealer.
Faulty spark plug. To test, remove spark plug. Attach spark plug lead to spark plug. 
Ground the spark plug body against the engine block. Crank the engine. The spark 
plug should fire at the electrode. Replace if it does not.
If the air cleaner is dirty, the engine may not start. Refer to the engine manual packed 
with your unit.

Engine 
smokes

Engine oil has 
been overfilled.
Engine loses 
crankcase
vacuum.

Check oil level.

Dipstick not seated or broken. Replace defective part. 
Engine breather defective. Replace.

Excessive 
vibration

Bent or 
damaged blade.
Bent blade.

Stop engine immediately. Check all pulleys, blade adapters, keys and bolts for
tightness and spindle damage. Tighten or replace any damaged parts.
Stop engine immediately. Replace damaged blade. Only use original equipment 
blades.

Mower will 
not 
discharge 
grass or 
leaves 
uncut strips

Engine speed 
low.
Speed selection.
Cutting height 
set too low.
Blades short or 
dull.

Throttle must be set at full throttle.

Use lower ground speed. The slower your ground speed, the better the quality of cut.
Raise deck.

Sharpen or replace blades (uncut strip problem only).