Idiomas disponibles
Idiomas disponibles
Fig, 29
Back Plate
_
Locking
Tab
Fig, 30
Tabs
Fig. 31
Tab
IDLE SPEED ADJUSTMENT
i lW O..o
thecuttn0he
n0 I
adjustments.
Wear protective
clothing and observe all safety
instructions
to prevent serious personal injury.
The idle speed of the engine is
Idle Adj
adjustable. An idle adjustment screw
is between the air filter cover and the
engine starter housing (Fig. 32).
NOTE:
Careless adjustments
can
seriously damage your
unit. Aside from the idle
speed, only a Sears or
other qualified service
dealer should make
carburetor adjustments.
1. Check Fuel
Old fuel is usually the reason for idle
speed problems. Drain and refill the
Fig. 32
tank with fresh fuel prior to making
any adjustments.
Refer to Oil and Fuel Information.
2. Clean Air Filter
iAiw o..o
to eventse
ous eson
nuesuethe
I
cutting
attachment
has stopped
rotating
before you turn it off and
set it down.
The condition of the air filter is important to the operation of the unit. A dirty
air filter will restrict air flow. This is often mistaken for an out of adjustment
idle. Check the condition of the air filter before adjusting the idle speed screw.
Refer to Air Filter Maintenance.
3. Adjust
Idle Speed Screw
I _
I WARNING:
The cutting attachment
may spin during idle speed I
adjustments.
Wear protective
clothing and observe all safety
instructions
to prevent serious personal injury.
If, after checking
the fuel and cleaning the air filter, the engine still will not
idle, adjust the idle speed screw as follows:
1.
Start the engine and let it run at a high idle for a minute to warm up.
Refer to Starting/Stopping
Instructions.
2.
Release the throttle trigger and let the engine idle. If the engine stops,
insert a small Phillips screwdriver
in between the Air Filter Cover and
the Engine Cover (Fig. 32). Turn the idle speed screw in, clockwise,
1/8
of a turn at a time (as needed) until the engine idles smoothly.
NOTE:
The cutting head should not rotate when the engine idles.
3.
If the cutting attachment
rotates when the engine idles, turn the idle
speed screw counterclockwise
1/8 of a turn at a time (as needed), until
the head stops turning.
Checking the fuel, cleaning the air filter, and adjusting the idle speed should
solve most engine problems. If not and all of the following
are true:
• the engine will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
Have the carburetor serviced by a Sears or other qualified service dealer.
ROCKER ARM CLEARANCE
This requires disassembly
of the engine. If you feel unsure or unqualified to
perform this, take the unit to a Sears or other qualified service dealer
NOTE:
Inspect the valve to rocker arm clearance with a feeler gauge after
the first 10 hours of operation and every 40 hours of operation.
• The engine must be cold when checking or adjusting the valve clearance.
• This task should be performed inside, in a clean, dust free area.
1.
Remove the six (6) screws on the back of the engine cover with a Flat-
head or T-25 Torx screwdriver
(Fig. 33).
2.
Disconnect
the spark plug wire.
3.
Clean dirt from around the spark plug. Remove the spark plug from the
cylinder head by turning a 5/8 in. socket counterclockwise.
4.
Remove the engine cover (Fig. 33).
View
Of The
Rear
Engine
Cover
Remove
Screws
Remove
Screws
6.
7.
Fig. 33
Clean dirt from around the rocker arm
cover. Remove the screw holding the
Rocker Arm
rocker arm cover with a large flat blade
Cover
screwdriver or Torx T-25 bit (Fig. 34).
Remove the rocker arm cover and
.\
gasket.
Spar
Pull the starter rope slowly to bring the
Plug Hole
piston to the top of its travel, (known
as top dead center). Check that:
The piston is at the top of its travel.
Look in the spark plug hole to view the
piston (Fig. 35)
Both rocker arms move freely, and
Fig. 34
both valves are closed.
If these statements
are not true, repeat step 6.
Slide the feeler gauge between the rocker arm and the top of each
valve stem. Measure the clearance between the valve stem and rocker
arm (Fig. 35 & 36). Measure both the intake and exhaust valves.
Rocker Arms
Adjusting
Nuts
INTAKE
EXHAUST
Feeler
Gauge
@
Fig, 35
11
