Troubleshooting - Craftsman 358.797150-32cc Important Manual

CARBI_.E'roR AD]U_
• This is a complicated task and it is important to
i'ollow instructions in sequence as indicated.
AWAm mG
Make carburetor adj_-_nents with the drive shaft
housing supported to prevent the trimmer line from
contacting any object. Hold the tool with your hand;
do not use the optional shoulde_ strap for support.
_WARNING
Keep others away when making carburetor
adjustments.
AWXV.mNG
Serious injurY !o the operator and otherscan (z'cur if the
carburetor is not properly adjusled.
2.aASlC CARaURETORsE'rrmGs
NOTE: In most cases, your engine can be made torun
properly with minor carburetor adjustments. Refer to
"Trouble Shooting Suggestions" for the _ndition you
areexperiencing and follow the instructions. Thebasie
carburetor settings are provided in case they are
_quired.
a. Turn the Low Speed Mixture Screw and-the High
Mixture Screw (Figme 33) clockwise until they
stop. Do not turn the screws until they are tight as
damage to the needle seats can occur.
b. Turn the Low Speed Mixture and High Speed Mix-
tureScrews one full turn counterclockwise.
c. Follow instructions "a. Preparation;" through "'f.
....... • Poor engine performance can be a result of other ............ High Speed Mixture Adjustment"
o
causes such as dirty air filter, carbon build-up
on muffler outlets, etc. See "Trouble Shooting
Chart" before proceeding with carburetor
adjustments.
The carburetor has been carefiflly adjusted at the
factory. However, the operator must be sure that
adjustments are made when •any of the conditions
occur as mentioned in "Trouble Shooting Sugges-
tions" below.
o
Very small adjustments can affect engine perfor-
mance/It is important to turn the screw a very small
amount pe.r adjustment and test performance before
making further adjustments. Each adjustment should
be no more than the width of the slot in the adjusting
SCreWS.
L TROUBLE SHOOTING SUGGE_rIONS
-- Engine will not continue to run _t idle posRion.
: Speed Mixture Adjtts4ment."
_- Trimmer Head continues to spin when the engine
idles, See "b. Idle Speed Adjustment" and "d.
Deceleration Check:
Engine dies or hesltateswhen itsimuld accelerate.
See "c. Acceleration Check"
-- loss ofcutting power whichcannot be corrected
by cleaning the air f'dter. See "f. High Speed Mix-
ture Adjustmenl7
-- Engine does not return to idle from full throttle
within 2 seconds. See "d. Deceleration Check:'
--•Engine will not run. See "Trouble Shooting
Chart :' Then, if the carburetor requires adjust-
ment, begin with"2. Basic Carburetor Settings."
I The trimmer line will be spinning during mostof this
] .p_x_ure. Wear your protective equilanent and observe
3. PR04_DURE
a. PREPARATION
I..)Use a fr_h fuel mix. See "Fueling Your Engkn.e7
2. )Make sure the line extends to the length allowed
by the line limiter to provide correct load on
engine.
3.) Start the engine. Cut grass for 3 minutes towarm
engine. The engine musr be at operating temper-
ature before carburetor adjustments ean be per-
formed correaI2_
4.) Stop engine and remove air filter by pulling it out
with your fingers. Refer to "'Specifications'_ for
location.
• I_iDLESeEED_AP_F_)_STMEN_T
l.)AUow engine to idle. •
2.)Adjust Idle Speed Screw (Figur_ 33) uatil the
engine continues to nat without stalling and
without the trimmer head moving. • "
-- Turn screw c_e tq increase engine speed
if the engine stalls or dies."
-- Turn screw cotintercloch_e to slow engine
down and/or to keep trimmer head from
3.)Follow instructions in "c. Acceleration Check"
and "d. Deceleration Check:"
4.)No further adjustments are necessary if the
trimmer head does not lurnat idle speed and
if performance is satisfactory.
I AwARs o 1
Recheckidlespeed after each adjtistment. The trimmei [
head must not turn at
!dlespeed
to avoid seriousinjury
I