52
owner's
manuah
MODEL NO.
636.796670
CAUTION:
Read Rules for
Safe Operation
and instructions
Carefully
e Assembly
. Operation
BUSHWACKER
o Maintenance
o Repair Parts
Sears, Roebuck and Co., Chicago, IIL 60684 U.S.A.
5209500101 4/89 PRINTED IN JAPAN
TWO YEAR LIMITED WARRANTY ON CRAFTSMAN
BUSHWACKER 636.796670
Fo_ two years from date o{ purchase when this BUSHWACKER is maintain6_, tubricated, and tuned up according to the
operating and maintenance instructions in the owner's manual. Sears will repair free of charge any defect In material or
workmanship
This warranty excludes blades, spark plug_and air cleaner: which are expend_He part., and become worn during normat
USe,
t# this BUSHWACKER }s used for commercial or rental purposes, this warranty applies for only 30 dayt from the data of
purchase.
WARRANTY SERVICE IS AVAILABLE BY CONTACTING THE NEAREST SEARS SERVICE CENTER/DEPART-
MENT tN THE UNITED STATES. This warranty applies onty while this product is in usein the United Statas_
This warranty gives yOU specific tagal tieht_= and you may atso have other rights which very from scare to state,,
SAFETY RULES AND PRECAUTIOHS
Before each operation, make sure that the screws are not
loose or missing, that the components are not damaged,
and that the blades are not chipped off or cracked. If a
blade is chipped or cracked replace it with a new one,
,
Do not attempt engine or blade adjustments or refuel-
ing before allowing the engine and mufffer to coo!,
a. [30 not remove the fuel tank cap while the engine is
running or when it is still hal
b, Clean off fuel tank cap area before refueling.. Do not
smoke while refueling_
c Take care not to spill any fuel. If it is spilled, wipe it
off
d Never operate on gasoline only As this engine is of
2-cycle type, use mixed fuel whose mixture ratio is
t6:1 (1 Bat gasoline to 8 oz. oil) and a proper lubri-
cation oil such as Sears Catalog Number 36555.
3. Do not operate the machine when your physical condi-
tion is not good. Never touch the plug cap during opera,.
lion to protect yourself from etectric shock..
4 Never operate the machine wherever ventilation is not
enough,
5 Before starting the engine, make sure that the blade does
not touch anything In startup of the engine, be careful
not to turn the blade toward bystranders. Posit_on
BUSHWACKER securel% (In startup, place 8USHWACK-
ER in a level place so as to prevent the blade from
moving )
6 Wear safe clothes (safety shoes, goggles, earmuffs, gloves,
etc ) Never wear loose clothing or jewelry while operat-
ing your BUSHWACKER
SEARS, ROEBUCK AND CO
DEPT, 698/731A
SEARS "TOWER
CHICAGO, ILLiNOiS 60684
7. Do not admit any persons or animals within the working
area (30 feet or lessfrom the site),.When plural operators
work together in the same place, maintain at least a
30 feet distance from each other and exchange warning
shouts if necessary° Pay special attention to keep by.
standers, especially children away from the working site.
8 Stop the engineand pay special attention to the blades
whenever you carry the BUSHWACKER from one place
to the next before and after operation.
9. Never let any child handle the machinm
!0_ Use BUSHWACKER only for cutting of young trees,
grass, etc, of which diameter is 0°2" or tess, Never use
BUSHWACKER to cut motets or other hard materials,
11, Never operate BUSHWACKER in a bad weather condi-
tion (rain, snow, strong wind, abnormal atmospheric
temperature, etc.)
12_ Keep this manual in place so that one can refer to it
repeatedly for safety operation and to teach possible
users how to operate the machine,
CAUTION: The operation of any BUSH-
WACKER can result in Foreign objects
being thrown into the eyes, which can
result in severe eye damage. Always wear
safety glasses or eye shields before com-
mencing power tool operation., We re_
commend Wide Vision Safety Mask for over spectacles or
standard safety! glasses, available at Sears Retail or Catalog
Stores,
KNOW YOUR BUSHWACKER
Your new B[JSHWACKER has been carefully packed at the factory to prevent damage during shipping and storage,
however, even with the best of preventative measures, damage does sometimes occur It is recommended that you follow the
check out procedures listed below:
Remove all items from the carton, lay them out and check the parts Io be sure that you have everything required for
assembly. Also check carefully for any visible damage. (IN THE EVENT THA'F SOMETHING IS DAMAGED OR MISSING
OR BOTH, NOTIFY YOUR SEARS STORE IMMEDIATELY,)
You should familiarize yourself with the various parts of your BUSHWACKER before attempting to assemble or operate
the unit, Refer to drawing below.
i
SPECIFICATIONS
TYPE
DISPLACEMENT
u_ I CARBURETOR
z l FUEL TANK
_ !CAPACtTY
SPARK PLUG
LUBRICATION
J
DRYWEIGHT
DIMENSION
2 cycle air-cooled
2013 cc 1i,24 Cu' In,)
O ,p.ragmtype ..................
17,5 UoSoff. oz,. (0°5£)
NGK BM7A or CHAMPION CJ 6.
Fuel oil Mixed 16 to 1
(1 gal. gasoline to 8 oz, oil)
t0.5 ibs (4.8 kg)
35.5 × 8,7 x 8,6 in,
"SEARS CATALOG NUMBER-36402
FRONT HANDLE
I OVERALL LENGTH i 18"TOOTH PITCH j 0.98"
CUTTING STROKES 32°2 times/see (8000 rpm}
i ENGINE RPM 8000 rpm
....... PER MINUTE
DRIVE SYSTEM
CLUTCHTYPE Dry Centrifugal
CLUTCH ENGAGE. 3800 rpm -+200 rpm
MENT
BLADE DRIVE Double cam drive
STARTLER KNOB
ENG
START/STOP SWITCH
TH ROTTLE
LEVER
UPPER BLADE
GUIDE P_T i
LOWER BLADE
REAR HANDLE
FUEL TANK
SHIELD
* Specifications are subject to change without notice,
PREPARaHG FOR OPERATaON
Fuel and oil mixture
inspect the fuel tank and flit with clean, fresh fuel of
the proper mixture This engine requires a mixture of
t6 parts gasofine to t part oil (1 gal gasoline to 8 oz
oil) Use 71-36555 Craftsman Engine Oil or a high grade
b_vo cycle engine oi!.
WARNING: Experience indicates that alcohol blended fuels
{called gasohot or using ethanol or methanol) can attract
moisture which leads to separation and formation of acids
during storage Acidic gas can damage the fuel system of an
engine while in storage
To avoid engine problems, the fuel system should be emptied
before storage for 30 days or longer. Drain the gas tank, start
the engine and let it run until the fuel lir_es and carburetor
are empty,. Use fresh fuel next season See Storage Instruct{arts
for additional information
Never use engine or carburetor cleaner products in the fuel
tank or permanent damage may occur.
5. To avoid a burn, do not touch the engine during the
operation or immediately after stopping the englne_
Handle the engine after it is completely cooled.
6 Never operate BUSHWACKER on unstable ground or
standing on tiptoe Never use it while climbing a ladder,
Do not use the 8USHWACKER continuously for a tong
7.
time. It is. normal tO take a break of 10 to 20 minutes
after every 50_minute operation.
Never leave the 8USHWACKER running unattended,
8
9
If there is any trouble during operation, be sure to stop
the engine first. (Move the switch to STOP.}
STARTINCI _,ND STOPPING
1. When starting the engine, set the switch to START,
(Figure 1)
DO NOT MIX GASOLINE AND OIL DIRECT-
LY tN THE ENGINE FUEL TANK,
IMPORTANT: Failure to follow proper fuel mix
instructions could result in serious damage to
the engine
CAUTION:
Nhen preparing fuel mixture mix only the amount needed
for the job you are to do Do not use fuel mixture that has
been stored longer than two (2} months Fuel mixture
stored longer than [his will cause hard starting and poor
iperformance tf fuel mix has been stored longer t:han this
itime it should be replaced and filled with a fresh mixture.
CAUTION! NEVER over Fill Fuel Tank
NEVER add fuel to the tank in a closed un-ventilated are&
DO NOT add fuel to this unit near an open fire or sparks.
BE SURE to wipe off spilled fuel before attempting to start
the engine,
DO NOT attempt to refuel an extremely hot engine.
Check points before operation
CHECK for loose bolts, nuts and fittings
Clean the air lifter of all dirt, etc before the operation_
PRSCAUTIONS DURSNG OPERATION
Switch
Figure 1
2_
The choke control is a "Lever" type (See. Figure 2L To
choke the engine, push the choke lever to "Close"
position. NOTE: If the engine is warm, it may be
started with the choke lever mid-way between "OPEN"
and "CLOSE", depending on the individual engine.
If the blades have stopped on account of a branch
caught during the trimming, be sure to stop the engine
and eliminate the branch. Refrain from cutting too
hard or too thick a branch (over ¼°' in diameterL
2.
When the machine is running, never touch the blades
Never point the blades toward a person.
3
Hold 8USHWACKE R firmly with both hands.
4
The engine speed must not be excessive but iust enough
to do the cutting
Figure 2
3. Puli the throttle lever a little, push the throttle knob
and lock the throttle lever at the starting position.
(Figure 3}
Figure 3
4, Pull the recoil starter several times_ (At this time, hold
the machine securely so as to keep it fixed.)
(Figure 4)
The carburetor is no'. filled with fuelo Pull the starter 7 to
8 times to feed up fuel from tank to carb_retor.
without a load, otherwise the engine will run at a high
speed reducing engine life.
Stopping the Engine
I Reduce the engine rpm to idle by releasing the throttle
2 Set the stop switch to stop. (Figure 1)
Blade sharpening
If the edges are rounded and do not cut well any more,
grind oft= only the shaded portions, Do not grind the
contact _urfaces (sliding surfaces) of the top and bottom
edges, (Figure 5}
Caution: - Never let go of the starter rope from its fully ex-
tended state. Return the starter rope to its original
position while holding it securely.
-- Be careful not to break the starter rope,
Figure 4
5. After s_arting, open the choke lever by degrees to the full
and reset the throttle lever to the low speed, while check..
ing the engine operating state.
Caution: - tn starting of the engine and during operation, be
fully careful to keep bystanders or obstacles off
the operating sideand confirm safety requirements
for operatlo n.
6. After starting the engine, warm up the engine (for about
5 minutes at medium speed). Immediately after starting,
speed up the engine slowly Never open the throttle fully
Disk grinder
\
Holding the disk grinder at a
45 ° angle, 9rind the edge aff
to the dotted line to sharpen
_he rounded tip,
Figure 5
Note:
1) Before grinding, be sure to secure the blade
firmly
2) Weargloves,protective glasses,etc_
3) An edge ground too much at a time or ground
many times will loose its hardened layer, it
becomes rounded and dull very quickly in
use° Order replacement blades from Sears Re-
pair parts.,
Adjustments
SPARK PLUG MAINTENANCE - If the spark plug
electrode area has an excess of carbon buildup, the
efficiency of the plug will be seriously reduced..
REMOV_ THE CARBON WITH A SPARK PLUG
CLEANER OR WIRE BRUSH
After cleaning the spark ,,plug RESET THE
ELECTRODE GAP TO 024-028.
c_oss zectia
Carburetor
Proper adjustment of the carburetor is very important to
the operation of this engine. The carburetor has been
carefully ad)usted at the factory and therefore should
not require any further adiustmenL
Adjustment of Engine Idling
{f the blade happens to run in idling, adjust the cable
adjuster of the throtde wire to stop blade movement in
idling_
Figure 6
STORAGE AFTER OPERATION
1
Clean every part, repait faulty sections, and apply a thin
coat of oil on metal parts to prevent rusL In cleaning
the machine, always use a dean cloth, Never use strong
solvents, such as gasoline
2,
if the BUSHWACKER will not be used for a iong
period of time, drain the fuel from the tank, then start
the engine and keep the engine running until it consumes
all the fuel taft in the carburetor.
_ILADI_ ADaUSTM_-_T
(Performed with engine stopped,)
The blades wear with use when you notice a decrease in
cutting performance adjust the blades asfollows°
Upper blade
Cross-sectional view of blades
H)
Loosen lock nuL
(2)
Tighten truss head screw lightly until it stops
turning. Then turn it back one-fourth to one half
tum.
(3)
Tighten lock nut. Lubricate the blades after adjust-
ment_..
{4)
Stalt the engine and ooerate the blades at high
the _peedfor a minute or so.
(5)
Stop the engine and carefully feel the blades with
your hand, If they are just warm to the touch, you
have made the proper adjustments, but if they are
too hot for you to keep touching them, repeat
steps #1. #'2 and #3 above backing off slightly more
on 'the screw.
Note: Never fail to stop the engine before making the
adjustments.
3. Store the BUSHWACKER in a clean and dry place.
Always keep children away from the machine.
Remove the spark plug. inject a smell amount of engine
oil through the spark piug hole. Then pull the recoil
starter a few times to put a thin coat of oil on the cylin..
der.. Install the spark plug again when the piston has
stopped at a top dead center.
It is important to prevent gum deposits from forming in
essential fu[:] system parts such as the carbure[or_ fuel filter,
fuel hose, or tank during storage Also, experience indicates
that alcohol h_er_ded_uels(caUed gasohol or using ethanol or
methm_o!) r.a_ attract moisture which leads to separation and
_ormatio_ ol acids durinq storage Acidic gas can damage the
fu_:l system ol Jr_engine while in storage
To avoid t_N!li_)=: problems, {he fuel system should be emptied
b(:h)re star._!iJ., (}I 30 (lays or ionrjer. Follow these instructions:
PR_VI_ITATIIVI_ MAINTI_I_ANC_ CHI_CK
LIST AND STORAQt_ TIPS
Be surethe engineand all other pmts areclean,
Check all nuts, bolts, screws, etc..making sure they are
tightened and secured as they should be.
inspect Carefully for' any fuel or oil leeks.
Check the air cleaner assembly for excessivedustor dirt_
If the filter requires cleaning, use the following
procedure: Remove the filter and wash in soap and
water or blow off with compressedair. DO NOT clean
filter in gasolineor other flammable solvent,
Inspect the muffler exhaust port /,tail pipe). If thece is
any clogging, remove carbon particles adhering to iL
_AB_TS_A_C_
In every 10--20 hours, inject one or two ounces of
grease through a grease nippFe installed in the gear case
of the BUSHWACKER Be sure the engine is stopped
while greasing the gear case
Figure 7
__________________________________________________________________________u_______________________________________1111111111111____________________________________________l________________________________________________________
2 Stop the engine before tubricatirrg the blades during the
cutting operation, Frequent lubrication using a light
weight oil during cutting will greatly add to blade life,
Figure 8
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The Model Number will be found on the top of recoil st artero Always
mention the Model Number When requesting service or repair parts
for your unit.
All parts listed herein may be ordered from any SEARS, ROEBUCK
AND CO,. OR SIMPSONS_SEARS LIMITED service units or most
retail stores.
WHEN ORDERING REPAIR PARTS, ALWAYS GIVE THE
FOLLOWING INFORMATION AS SHOWN IN THIS LIST,
MODEL NO.
636.796670
How to Order
Repair Parts
1. The PART NUMBER
2, TheMODEL NUMBER
of the Bushwacker
3 The PART DESCRIPTION
4, The NAME OF ITEM-
20.3cc Gas Bushwacker
636. 79667{I
if the parts you need are not stocked _ocalty, your order will be
eIectronicatly transmitted to a Sears Repair Parts Distribution center
for expedited handling
When you buy merchandise
from Sears you get an extra
something that nobody else
can offer .... Sears Service.
Across town or across the
country, Sears Service follows
you, providing trustworthy,
competent service technicians
using only Sears specified
factory parts.
Your Sears Merchandise takes on added value when you discover
that Sears has Service Units thioughout the country, Each is staffed
SEARS SERVICE
by Sears_Trained, professionail technicians using Sears approved
methods..
IS AT YOUR SERVICE
Sears, Roebuck and Co., C]-doago, lli 60684 U.S.A.
82005801014/89 PRINTED IN JAPAN
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