Page 1
OWNER'S
MANUAL
MODEL NO.
247.799E40
Caution:
Read and Follow
All Safety Rules
and instructions
Before Operating
This Equipment
CRAFTSMAN
9 HORSEPOWER
MULCHING AND BAGGING
CHIPPER-VACUUM
Assembly
Operation
Customer Responsibilities
Service and Adjustment
Repair Parts
®
SEARS, ROEBUCK AND CO., HoWman Estates, IL 60179 U.S.A.
inted in U.S.A.
770-8894K 2/95
Page 2
IMPORTANT
THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS WHICH, IF NOT FOLLOWED, COULD ENDANSER THE PERSONAL
SAFETY AND/OR PROPERTY OF YOURSELF AND OTHERS. READ AND FOLLOW ALL INSTRUCTIONS IN THIS MANUAL BEFORE
A
ATTEMPTING TO OPERATE YOUR POWER CHIPPER-VACUUM. FAILURE TO COMPLY WITH THESE INSTRUCTIONS MAY RESULT IN
PERSONAL INJURY. WHEN YOU SEE THIS SYMBOL— HEED ITS WARMING.
Your chipper-vacuum was built to be operated according to the rules for safe operation in
this manual. As with any type of power equipment, carelessness or error on the part of the
DANGER' operator can result in serious injury. This unit is capable of amputating fingers and hands
A
and throwing objects. Failure to observe the following safety Instructions could result in
serious injury or death.
SAFE OPERATION PRACTICES
A
I. GENERAL OPERATION
к» Read this owner’s guide carefully in its entire^ before attempt
ing to assemble this machine. Read, understand, and follow all
instructions on the machine and in the manualjs) before opera
tion. Be completely familiar with the controls and the proper use
of the machine before operating it. Keep this manual in a safe
place for future and regular reference and for ordering replace
ment parts.
• Your chipper-vacuum is a powerful tool, not a plaything.
Therefore, exercise extreme caution at all times. Your unit has
been designed to perform two jobs; to chip and vacuum vegeta
tion found in a normal yard. Do not use it for any other purpose.
• Never allow children under 16 to operate the unit. Children 16
years and older should only operate under close parental super
vision. Only responsible individuals who are familiar with these
rules of safe operation should be allowed to use your unit.
• Keep the area of operation clear of all persons, particularly small
children and pets. Stop the engine when they are in the vicinity
of the unit.
• When feeding material into this equipment, be extremely careful
that pieces of melal, rocks, bottles, cans or other foreign objects
are not included. Personal injury or damage to the machine
could result.
• Always wear safety glasses or safety goggles, during operation
and while performing an adjustment or repair, to protect eyes
from foreign objects that may be thrown from the machine.
• Wear sturdy, rough-soled work shoes and close fitting slacks
and shirt. Shirt and slacks that cover the arms and legs and
steel-toed shoes are recommended. Do not wear loose fitting
clothes or jewelry and secure hair so it above shoulder length.
They can be caught in moving parts. Never operate a unit In
bare feet, sandals or sneakers. Wear gloves when feeding mate
rial in the chipper chute.
• Do not operate the unit while under the influence of alcohol or
drugs.
• Do not over-reach. Keep proper footing and balance at all times.
• Never place your hands or any part of your body or clothing near
or under rotating parts. Keep clear of the discharge opening at
all times Never insert your hands or any part of your body or
clothing into the nozzle, chipper chute or discharge opening as
the rotating impeller can cause serious injury.
• If it is necessary for any reason to unclog the feed intake or dis
charge openings or to inspect or repair any part of the machine
where a moving part can come in contact with your body or
clothing, stop the machine, allow it to cool, disconnect the spark
plug wire from the spark plug and move it away from the spark
plug before attempting to unclog, inspect or repair.
• Never operate unit without vacuum bag and discharge chute
properly affixed to unit Large zippered end of bag must be
closed to prevent objects from being blown out.
• Never operate unit without either the inlet nozzle or optional
hose attachment properly affixed to unit. These devices shield
the operator from accidental contact with the rotating impeller.
Never attempt to convert the unit from nozzle to hose mode or
vice versa with the engine running.
• Never attempt to remove or empty vacuum hag when engine is
running. Shut the engine off and wait for the impeller to come to
a complete stop before removing the bag. The impeller contin
ues to rotate for a few seconds after the engine is shut off.
Never place any part of the body in the impeller area until you
are sure the impeller has stopped rotating.
• Keep all guards and safely devices in place and operating prop
erly.
• Do not allow an accumulation of processed material to build up
in the discharge area as this will prevent proper discharge and
can result In kick-back from the chipper chute.
• Keep your face and body back from chipper chute to avoid acci
dental bounce back of any material.
• If the cutting mechanism strikes a foreign object or if your
machine should start making an unusual noise or vibration,
immediately stop the engine, disconnect the spark plug wire and
move the wire away from the spark plug. Allow the machine to
stop and take the following steps.
• Inspect for damage
• Repair or replace any damaged parts.
• Check for any loose parts and tighten to assure continued
safe operation.
• Muffler and engine become hot and can cause a burn. Do not
touch.
• Do not allow leaves or other debris to buiid up on engine’s muf
fler. The debris could ignite and cause a fire.
• Do not operate engine if air cleaner or cover over carburetor air
intake is removed, except for adjustment. Removal of such
parts could create a fire hazard.
Ul. CHILDREN
"Tragic accidents can occur if the operator is not alert to the pres
ence of small children. Children are often attracted to the chipping
and vacuuming activity. Never assume that children will remain
where you last saw them.
• Keep children out of the work area and under the watchful eye of
a responsible adult other than the operator.
• Be alert and turn the unit off if a child enters the area.
• Never allow children under the age of 16 to operate the chipper-
vacuum,
III. SERVICE
A
• Use extreme care in handling gasoline and other fuels. They are
extremely flammable anti the vapors are explosive.
• Store fuei and oil in approved containers, away from heat
and open flame, and out of the reach of children.
Page 3
• Check and add fuel before starting the engine. Never
remove gas cap or add fuel while the engine Is running.
Allow engine to cool at least two minutes before refueling.
• Replace gasoline cap securely and wipe off any spilled
gasoline before starting the engine as it may cause a fire or
explosion.
• Extinguish all cigarettes, cigars, pipes and other sources of
ignition.
• Never refuel unit indoors because flammable vapors will
accumulate in the area.
• Never store the machine or fuel container inside where
there is an open flame or spark such as a gas hot water
heater, clothes dryer or furnace,
Never run your machine in an enclosed area as the exhaust from
the engine contains carbon monoxide, which Is a odorless,
tasteless and deadly poisonous gas.
To reduce fire hazard, keep engine and muffler free of leaves,
grass, and other debris build-up. Clean up fuel and oil spillage.
Allow unit to cool at least 5 minutes before storing.
Before cleaning, repairing, or inspecting, make certain the
impeller and ail moving parts have stopped. Disconnect the
spark plug wire and keep wire away from spark plug to prevent
accidental starting. Do not use flammable solutions to clean air
filter.
• keep alt nuts, bolts, and screws tight to be sure the equipment is
in safe working condition.
• Never tamper with safety devices. Check their proper operation
regularly.
• After striking a foreign object, immediately stop the engine, dis
connect the spark plug wire from the spark plug, and thoroughly
inspect the unit for any damage. Repair damage before starting
and operating unit.
• Do not alter or tamper with the engine’s governor setting. The
governor controls the maximum safe operating speed of the
engine. Over-speeding the engine is dangerous and will cause
damage to the engine and to other moving parts of the machine.
• Check the vacuum bag frequency for wear. Replace if worn or
damaged.
• Keep vacuum bag free of debris when not in use.
OWNER’S
MANUAL
SAFETY LABEL
A
Restrict the use of this power machine to persons who read,
understand and follow the warnings and instructions in this
manual and on the machine.
WARNING — YOUR RESPONSlBiLlTY
Page 4
CONGRATULATIONS on your purchase of a Sears
Craftsman Chipper-Vacuum. It has been designed,
engineered and manufactured to give you the best possible
dependability and performance.
Should you experience any problem you cannot easily rem
edy, please contact your nearest Sears Service Center/
Department in the United States. We have competent, welltrained technicians and the proper tools to service or repair
this unit.
Please read and retain this manual. The instructions will
enable you to assemble and maintain your chipper-vacuum
properly. Always observe the "SAFETY RULES.”
MODEL
NUMBER 247.799640
SERIAL
NUMBER^
DATE OF
PURCHASE.
PRODUCT SPECIFICATIONS
Horsepower:
Engine Oil Capacity:
API Classification SF, SG or SH
Fuel Capacity:
Approximately 1 Gallon
Spark Plug (Gap .030 in.):
Tire Pressure:
MAINTENANCE AGREEMENT
9.0
SAE 30
(26 Ounces)
(Unleaded)
Champion
J-8C (or
Equivalent)
24 p.s.i.
THE MODEL AND SERIAL NUMBERS WILL BE FOUND
ON A LABEL ATTACHED TO THE FRAME OF THE
CHIPPER-VACUUM.
YOU SHOULD RECORD BOTH SERIAL NUMBER AND
DATE OF PURCHASE AND KEEP IN A SAFE PLACE
FOR FUTURE REFERENCE.
CUSTOMER RESPONSIBILITIES
Read and observe the safety rules.
Follow a regular schedule in maintaining, caring for
and using your chipper-vacuum.
Follow the instructions under “Customer Respon
sibilities” and “Storage” sections of this Owner’s
Manual-
A Sears Maintenance Agreement is available on this
product. Contact your nearest Sears store for details.
WARNING: This unit is equipped with an internal combus
tion engine and should not be used on or near any unim
proved forest-covered, brush-covered or grass-covered land
unless the engine's exhaust system is equipped with a
spark arrester meeting applicable local or state laws (if any).
If a spark arrester is used, it should be maintained in effec
tive working order by the operator.
In the State of California the above is required by law
(Section 4442 of the California Public Resources Code}.
Other states may have similar laws. Federal laws apply on
federal lands. A spark arrester for the muffler is available
through your nearest Sears Authorized Service Center (See
the REPAIR PARTS section of this manual.)
WARRANTY
FULL ONE YEAR WARRANTY ON CRAFTSMAN GAS CHIPPER-VACUUM
For one year from the date of purchase, when this Craftsman chipper-vacuum is maintained, lubricated, and
tuned up according to the operating and maintenance instructions in the operator’s manual, Sears will repair,
free of charge, any defect in materia! or workmanship.
This warranty excludes the chipper blades, flails, air cleaners, spark plugs, catcher bags and tires, which are
expendable parts and become worn during normal use.
If this chipper-shredder is used for commercial or rental purposes, this warranty applies for only 30 days from
the date of purchase.
WARRANTY SERVICE IS AVAILABLE BY CONTACTING THE NEAREST SEARS SERVICE CENTER IN THE
UNITED STATES. THIS WARRANTY APPLIES ONLY WHILE THIS PRODUCT IS IN USE IN THE UNITED
STATES.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
SEARS ROEBUCK AND CO., DEPT. 817WA, HOFFMAN ESTATES, IL 60179
Page 5
TABLE OF CONTENTS
SAFETY RULES
PRODUCT SPECIFICATIONS....................................4
MAINTENANCE AGREEMENT
CUSTOMER RESPONSIBILITiES...
WARRANTY............................................................ 4
INDEX.................................................................... 5
ACCESSORIES...........................................................5
ASSEMBLY..............................................................6-8
Accessories
Adjustments:
Carburetor........................................................... 17
Clutch Cable...........................................................7
Engine Speed..................................................... 17
Shift Rod
Assembly instructions
Catcher Bag
Controls......................................................................9
Customer Responsibilities.............................4, 12,13
Engine:
Lubrication...........................................................12
Maintenance
Starting
Stopping............................................................
Storage.............................................................. 14
Fuel......................................................................... 10
Lubrication
......................................................
..................................
................
............................................................. 5
.......................................................... 16
.........................................
C
.............................................................
....................................................
..............................................................
F
L
...........
.................................................. 12
4, 12, 13
12,13
2, 3
6-8
7, 8
11
9,11
OPERATION
4
CUSTOMER RESPONSIBILITIES.......................12,13
STORAGE
SERVICE AND ADJUSTMENT
TROUBLE SHOOTING
PARTS ORDERING/SERVICE
REPAIR PARTS-CHfPPER-VACUUM
REPAIR PARTS—ENGINE
INDEX
Maintenance:
Oil
Operating Tips
Repair/Replacement Parts
Responsibilities, Customer........................4,12,13
Safety Rules.............................................................2, 3
Sharpening.......................................................
Spark Plug
Specifications.............................................................4
Storage
Table of Contents.......................................................5
Trouble Shooting
Unclogging
Unpacking................................................................q
Warranty ................................................................... 4
............
........................................................
Agreement
Schedule...............................................................12
Engine
Chipper-Vacuum ..................................................12
..............................................................................
.......................................................
...............................................................
............................................................... ......
.................................................
.............................................
...........................
..........................................
.................................
................
.................................
M
............................................................
O
.....................................................
R
......
..................
S
T
.....................................................
U
8-11
........14
14-17
...18
19-25
26-29
12,13
9,10
........19-29
........15
.....
.....14,15
w
18
4
10
13
13
.....
14
ACCESSORIES
These accessories were available when the chipper-vacuum was purchased. They are also available at most
Sears retail outlets, catalog and service centers. Most Sears stores can order repair parts for you when vou
provide the model number of your chipper-vacuum. ’
Spark
Plug
ft
Filter
UNii
Air
Muffler
ENGINE
Engine
Oil
i
Gas Can
Stabilizer
CHIPPER-VACUUM
Page 6
ASSEMBLY INSTRUCTIONS
IMPORTANT: This unit is shipped WITHOUT GASO
LINE or OIL In the engine. After assembly, see opera
tion section of this manual for proper fuel and engine
oil recommendations.
NOTE: To determine right and left hand sides of your
chipper-vacuum, stand behind and face the unit
(Refer to figure 7).
Your chipper-vacuum has been completely assem
bled at the factory except for the front wheels, hub
caps, nozzle, chipper chute, support bracket and bag.
A pair of safety glasses and bottle of oil are also
included in the carton.
TO REMOVE CHIPPER-VACUUM FROM CARTON
Cut the corner of the carton. Remove all packing
inserts and loose parts. Push down on handle to lift
front of chipper-vacuum, and roll chipper-vacuum out
of the carton. Make certain all parts and literature
have been removed before the carton is discarded.
TOOLS REQUIRED FOR ASSEMBLY
(1} 3/4“ Open End Wrench
(2) 1/2” or Adjustable Wrenches
Ò) 9/16" Wrench
(1) Funnel
LOOSE PARTS IN CARTON (See Figure 1)
(2) Front Wheels
(2) HubCapst
(1) Nozzle
(1) Chipper Chute
(1) Support Bracket
fNot Shown
(1) Bag
(1) Shift Knobt
Ò) Tamper Plugt
(1) Safety Giassest
(1) Bottle of Oil
FIGURE 2.
HOW TO SET-UP YOUR CHIPPER-VACUUM
ATTACHING THE FRONT WHEELS
• Tilt unit backward so that it rests on the handle(place a piece of the carton under handle to avoid
scratches). Remove the cardboard packing
material around the wheel brackets.
• Remove the hex lock nuts and shoulder bolts from
the front of the wheel brackets. See figure 2.
• Place wave washer on shoulder bolt, insert
shoulder bolt through wheel, with the head of the
shoulder bolt through the flat side of the wheel.
• Assemble wheel to outside of wheel bracket.
Secure with cupped washer (cupped side of
washer goes against the bracket) and hex lock nut.
Tighten.
• Align the four tabs on the hub caps with the four
holes in the wheel. Press in each tab until it locks in
place. The hub cap edges must be flush with the
wheel rim when installed properly.
ATTACHING THE NOZZLE (See figure 3)
• Remove the three plastic wing nuts frorn the front
of the chipper-vacuum. Place the nozzle in position
over the three weld studs. Secure with the wing
nuts just removed.
NOTE: The metal tab in the nozzle must depress the
safety switch on the front of the chipper-vacuum or
the engine will not start.
• Set unit in upright position.
6
Page 7
FIGURE 5.
Drive
ATTACHING THE CHIPPER CHUTE AND
SUPPORT BRACKET (See figure 4)
• Remove the two hex lock nuts from the hex bolts
which secure the right side of the upper handJe to
the lower handle. Leave bolts and washers in
place.
• Remove three cupped washers and 5/16" hex nuts
from the weld studs beside the opening on the right
side of the chipper-vacuum.
• Place the chipper chute in position over the weld
studs (slot goes at the bottom). Secure with cupped
washers and hex nuts just removed.
NOTE; Only tighten the three nuts one or two threads
for ease of further assembly.
NOTE: Cupped side of the washer goes against the
chipper chute. See figure 2 to identify cupped side of
washer.
« Remove the two hex bolts, flat washers and nuts
which are attached to the support bracket.
• Attach the support bracket to the bottom of the
chipper chute loosely using the hardware removed
previously. HEADS OF THE HEX BOLTS AND
WASHERS GO TO THE INSIDE OF THE
CHIPPER CHUTE.
• Place the support bracket over the two bolts in the
handle. Pushing UP on the chipper chute will aid
the alignment of the holes in the support bracket
with the bolts in the handle.
• Tighten ail hardware securely on the chipper chute,
support bracket and handle.
ATTACHING THE CLUTCH CABLE
The clutch cable has been assembled at the factory.
Loosen the hex nuts at the cable bracket. Hook the
“Z" end of the cable into the drive clutch handle from
the outside to the inside as shown in figure 5A. Pliers
wilt aid in assembly.
CLUTCH CABLE ADJUSTMENT
Adjust the hex nuts at the cable bracket so there is no
siack in the cable, but the cable Is NOT tight. Do not
overtighten the cable. See figure 5B.
To check the clutch adjustment, proceed as follows.
• Push the chipper-vacuum backward and forward
with the drive clutch handle released, it should
move freely.
If it does not, loosen both hex nuts at the cable
bracket. See figure 5B. Turn bottom nut counter
clockwise to loosen the cable.
• Engage the drive dutch handle (hold against upper
handle), and try to push chipper-vacuum backward
and forward. The wheels should lock up.
If the wheels do not lock up, loosen both hex nuts
at the cable bracket. Turn bottom nut clockwise to
tighten the cable.
• Recheck adjustment. Tighten both hex nuts when
correct adjustment is reached.
Page 8
FIGURE 7.
FIGURE 8.
ATTACHING THE BAG
• Place bag inside of handle assembly. Slip the
opening on the bag over the discharge chute, mak
ing certain it is over the rib on the discharge chute.
See figure 6.
• Place the four straps on the top of the bag over
upper handle, hooking them on studs. See figure 7.
NOTE: Be sure the bag goes under the drive ciutch
handle.
• Squeeze the damp on the drawstring, and pull the
drawstring tight. Release the clamp.
INSTALLING THE SHIFT KNOB
Remove the cardboard protecting the threads. Thread
the shift knob onto the end of the shift lever.
TAMPER PLUG
The handle on the tamper plug must be in the vertical
position as shown in figure 8. To determine which
side of the tamper plug is up, match the angle of the
tamper plug to the angle of the chipper chute.
Insert the tamper plug into the chipper chute. Tamper
plug should remain in the chipper chute whenever the
chipper chute is not In use.
OPERATION
KNOW YOUR CHIPPER-VACUUM „ ..
READ THIS OWNER’S MANUAL AND SAFETY RULES BEFORE OPERATING YOUR CHIPPER-VACUUM.
Compare the illustrations with your chipper-vacuum to familiarize yourself with the location of various controls and
adjustments. Save this manual for future reference.
Drive Clutch
Shift
Lever
Chipper
Chute
Handle
Spark Plug
Wire and Boot
Fast
FIGURE 9.
■Throttle
Stop
Page 9
MEETS ANSI SAFETY STANDARDS
Sears chipper-vacuums conform to the safety standards of the American National Standards Institute.
OPERATING CONTROLS (See figure 9^
SHIFT LEVER—^The shift lever determines ground
speed. It may be placed in one of eight positions.
Forward—one of six speeds. Position number one (1)
is the slowest. Position number six (6) is the fastest.
Reverse—two reverse (R) speeds. “R” {all the way to
the right) is the faster of the two.
DRIVE CLUTCH HANDLE (BAIL)—Squeezing the
drive clutch handle against the upper handle engages
BEFORE USING YOUR CHIPPER-VACUUM, AGAIN REFER TO THE “SAFETY RULES” AS SHOWN ON
PAGE 2 OF THIS MANUAL. ALWAYS BE CAREFUL.
The operation of any chipper-vacuum can result in foreign objects being throvi/n into the eyes, which
can result in severe eye damage. Always wear the safety glasses provided with the chipper-vacuum or
eye shields before chipping, or while performing any adjustments or repairs. We recommend Wide
Vision Safety Mask for over spectacles or standard glasses avaiiabie at Sears Retail or Catalog Stores.
TO STOP ENGINE
• Move throttle control lever to STOP position. See
figure 9.
• Disconnect spark plug wire and move away from
spark plug to prevent accidental starting while
equipment is unattended.
the wheel drive. Release the drive clutch handle to
stop the forward drive.
CHOKE LEVER—Used to enrich the fuel mixture in
the carburetor when starting a cold engine.
STARTER HANDLE—Used to manually start the
engine.
THROTTLE CONTROL—Controls engine speed and
stops the engine.
The best height for the nozzle wiil vary according to
the conditions. Adjust the height of the nozzle to find
the setting which gives the best performance for flie
operating conditions. In general, raise the nozzle to
vacuum a thick layer of leaves; lower the nozzle for
smooth surfaces.
HOW TO USE YOUR CHIPPER-VACUUM
WARNING: YOUR CHIPPER-VACUUM IS
EQUIPPED WITH A SAFETY SWITCH ON
A
TO ENGAGE DRIVE
IMPORTANT: Always release the drive clutch
handle before moving the shift lever.
• With the engine running near top speed, move shift
lever into one of the six FORWARD positions or
two REVERSE positions. Select a speed appropri
ate for the conditions that exist. Use the slower
speeds until you are familiar with the operation of
the chipper-vacuum.
• To engage the wheel drive, hold the drive clutch
handle against the chipper-vacuum handle.
Releasing the drive clutch handle stops the wheels
from driving. Release the drive clutch handle to
slow down when negotiating an obstacle, making a
turn or stopping. Engage siowly to prevent front
wheels from lifting up.
NOZZLE HEIGHT ADJUSTMENT
The height adjustment knob is located on the right
hand side of the chipper-vacuum. See figure 10. Turn
the knob clockwise to raise the nozzle. Turn the knob
counterclockwise to lower. (Be careful not to turn
knob too far—rod could come out of ferrule.)
THE FRONT OF THE HOUSING. NOZZLE
OR HOSE ATTACHMENT MUST BE IN
PLACE ON THE CHIPPER-VACUUM
BEFORE THE ENGINE CAN BE STARTED.
USING THE CHIPPER CHUTE
Do not attempt to chip any material other than vegeta
tion found in a normal yard {i.e., branches, leaves,
twigs, etc,). Material such as stalks or heavy branches
up to 3" in diameter may be fed into the chipper
chute. See figure 11.
WARNING: MATERIAL UP TO A MAXI
MUM OF 3“ IN DIAMETER MAY BE FED
A
INTO THE CHIPPER CHUTE, DO NOT
ATTEMPT TO CHIP ANY MATERIAL
LARGER THAN 3" IN DIAMETER.
PERSONAL INJURY OR DAMAGE TO
THE MACHINE COULD RESULT.
9
Page 10
if necessary, use the tamper plug provided to push
material into the chipper chute. See figure 8. NEVER
PLACE HANDS INSIDE CHIPPER CHUTE. Place
tamper plug inside chipper chute when not in use to
deaden the sound.
GAS AND OIL FILL-UP
OIL
Only use high quality detergent oil rated with API
service classification SF, SG or SH. Select the oil’s
viscosity grade according to your expected operating
temperature.
FIGURE 11.
IMPORTANT: There is a flail screen located inside
the housing in the discharge area, tf the fiail screen
becomes clogged, remove and clean as instructed in
the Service and Adjustment section on page 14.
For best performance, it is important to keep the
chipper blades sharp. If the composition of the
material being discharged changes (becomes stringy,
etc.) or if the rate at which the material is discharged
slows down considerably, it is likely that the chipper
blades are dull and need to be sharpened or
replaced. Refer to Service and Adjustments sections.
TO EMPTY BAG
Open the large zipper on the bag to empty the bag.
See figure 12. Be certain the zipper is closed when
operating the unit.
Colder
5W30
NOTE: Although multi-viscosity oils (5W30, 10W30,
etc.) improve starting in cold weather, these multi
viscosity oils will result in increased oil consumption
when used above 32“F. Check your oil level more
frequently to avoid possible engine damage from
running low on oil.
• Use engine oil provided. Remove oil fill dipstick.
See figure 13. With chipper-vacuum level, use a
funnel to fill engine with oil to FULL mark on dipstick.
Capacity is approximately 26 ounces. Be careful not
to overfill. Oil bottle provided contains 27 oz. of oil.
Tilt chipper-vacuum toward the left (from behind the
hopper), then re-level. Check oil level. Refill to FULL
mark on dipstick if necessary. Replace dipstick and
tighten.
32°F Warmer
SAE 30
FIGURE 12.
GAS
• Remove fuel cap and fill fuel tank with approxi
mately 1 gallon of clean, fresh, lead-free grade
automotive gasoline. DO NOT use Ethyl or high
octane gasoline. Be certain container is clean and
free from rust or foreign particles. Never use gaso
line that may be stale from long periods of storage
in the container. Replace fuel cap.
WARNING: DO NOT FILL CLOSER THAN
1/2 INCH OF TOP OF FUEL TANK TO
A
PREVENT SPILLS AND TO ALLOW FOR
FUEL EXPANSION. IF GASOLINE IS
ACCIDENTLY SPILLED, MOVE CHIPPERVACUUM AWAY FROM AREA OF SPILL.
AVOID CREATING ANY SOURCE OF
IGNITION UNTIL GASOLINE VAPORS
HAVE DISAPPEARED.
10
Page 11
Check the fuel level periodically to avoid rüñning out
of gasoline while operating the chipper-vacuum. If the
unit runs out of gas as it is chipping, it may be neces
sary to unclog the unit before it can be restarted.
Refer to “Removing the Flail Screen” in SERVICE
AND ADJUSTMENT section.
WARNING: EXPERIENCE INDICATES THAT ALCO
HOL BLENDED FUELS (CALLED GASOHOL 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 OR TREATED WITH FUEL
STABILIZER BEFORE STORAGE FOR 30 DAYS
OR LONGER. USE FRESH FUEL NEXT SEASON.
SEE “STORAGE” SECTION FOR ADDITIONAL
INFORMATION.
NEVER USE ENGINE OR CARBURETOR CLEAN
ER PRODUCTS IN THE FUEL TANK OR PERMA
NENT DAMAGE MAY OCCUR.
TO START ENGINE
IMPORTANT: IF UNIT SHOWS ANY SIGN OF
MOTION WITH THE CLUTCH HANDLE DISEN
GAGED, SHUT ENGINE OFF IMMEDIATELY.
READJUST AS INSTRUCTED IN THE “FINAL
ADJUSTMENTS” SECTION OF THE ASSEMBLY
INSTRUCTIONS.
NOTE: A noise will be heard when finding the start of
the compression cycle. This noise is caused by the
flails and fingers which are patt of the shredding mech
anism failing into place, and should be expected. In
addition, the flails and fingers will be noisy after the
engine is started, until the impeller reaches full speed.
• Pul! rope with a rapid, continuous, full arm stroke.
Keep a firm grip on start handle. Let rope rewind
slowly. Do rot let starter handle snap back against
starter.
• Repeat preceding two instructions until engine
fires. When engine starts, move choke lever on
engine halfway between CHOKE and OFF.
NOTE: if engine does not fire after three attempts,
move choke lever halfway between CHOKE and OFF
position and try again.
• Move throttle control to IDLE position for a few min
utes warm-up. Move choke lever to OFF position
as engine warms up.
NOTE: In order to idle smoothly, a new engine may
require 3 to 5 minutes running above slow idle speed.
Idle speed has been adjusted to be correct after this
break-in period.
Full Choke
Position
Off
Position
WARNING: BE SURE NO ONE OTHER
THAN THE OPERATOR IS STANDING
A
Grasp starter handle and pull rope out slowly until
engine reaches start of compression cycle (rope
will pull slightly harder at this point). Let the rope
rewind slowly.
NEAR THE CHIPPER-VACUUM WHILE
STARTING OR OPERATING. DO NOT
OPERATE THIS CHIPPER-VACUUM
UNLESS THE NOZZLE, DISCHARGE
CHUTE AND BAG HAVE BEEN PROPER
LY INSTALLED.
Attach spark plug wire and rubber boot to spark
plug if necessary. See figure 9.
Place the throttle control lever in FAST position.
Move choke lever to CHOKE position (See figure
14).
Place one foot on the left rear wheel to prevent the
unit from skidding while starting.
Choke
Lever
FIGURE 14.
TO STOP ENGINE
Move throttle control lever to STOP position.
Disconnect spark plug wire and move away from
spark plug to prevent accidental starting while
equipment is unattended.
11
Page 12
h*
Oil Pivot Points
E
a
o
QC
Clean Chipper-Vacuum
CL
Check Engine Oil
CUSTOMER RESPONSIBILITIES
V
Change Engine Oil
lU
Service Air Cleaner
z
<5
Z
Clean Engine Cylinder
lU
Spark Plug
Muffler
V CHECK
GENERAL RECOMMENDATIONS
WARNING: ALWAYS STOP THE ENGINE
AND DISCONNECT THE SPARK PLUG
A
• Periodically check all fasteners and be sure they
are tight
• Follow the Maintenance Schedule above.
WIRE BEFORE PERFORMING ANY
MAINTENANCE OR ADJUSTMENTS.
CHIPPER-VACUUM
LUBRICATION
Lubricate the pivot points on the height adjustment
mechanism once a season using a light oil.
CLEANING
• Clean the chipper-vacuum thoroughly after each
use.
• Wash the bag periodically with water. Allow to dry
thoroughly in the shade. Do not use heat.
ENGINE
ENGINE OIL
Only use high quality detergent oil rated with API
service classification SF, SG or SH. Select the oil’s
viscosity grade according to your expected operating
temperature.
V
V
V
V
Colder
5W30
NOTE; Although multi-viscosity oils (SE30, 10W30,
etc.) improve starting in cold weather, these multi
viscosity oils will result in increased oil consumption
when used above 32” F. Check your oil ievei more
frequently to avoid possible engine damage from
running low on oil.
Your four-cycle engine will normally consume some
oil—^therefore, check engine oil level regularly approx
imately every five hours of operation and before each
usage. Stop engine and wait several minutes before
checking oil level. With engine level, the oil must be to
FULL mark on dipstick (refer to figure 10). Change
engine oil after the first five hours of operation, and
every twenty-five hours thereafter.
To Drain Oil:
® Drain oil while engine is warm.
a. Remove oil drain cap. Refer to figure 10. Catch
oil in a suitable container.
b. When engine is drained of all oil, replace drain
cap securely.
® Refill with fresh oil. Refer to GAS AND OIL FILL
UP section.
* Replace dipstick.
32“F
SAE 30
12
Warmer
Page 13
AIR CLEANER
The air cleaner prevents damaging dirt, dust, etc.,
from entering the carburetor and being forced into the
engine and is important to engine life and per
formance.
Never run your engine without air cleaner com
pletely assembled.
To Service Air Cleaner:
Senrice pre-cleaner after every 25 hours of use, or at
least once a season. Replace filter every 100 hours of
use, or at least once a season. Service pre-cleaner and
filter more often under dusty conditions.
• Remove wing nut and cover. See figure 15.
• Slide pre-cleaner off filter. Clean the inside of base
and cover thoroughly.
® Clean pre-cleaner as follows.
Wash in water and detergent solution, and squeeze
(do not twist) until aii dirt is removed.
Rinse thoroughly in clear water.
Wrap In a clean cloth and squeeze (do not twist)
until completely dry, or allow to air dry.
® if necessary, replace filter (do not attempt to clean).
® Install new filter on base. Slide pre-cieaner over
filter.
• Ihstali cover and wing nut. Tighten wing nut
securely.
WARNING: PERIODICALLY CLEAN MUF
FLER AREA TO REMOVE ALL GRASS,
A
FIGURE 16.
SPARK PLUG
The spark plug should be cleaned and the gap reset
to .030" at least once a season or every 50 hours of
operation. See figure 17. Spark plug replacement is
reconnmended at the start of each season. Refer to
engine parts list for correct spark plug type.
NOTE; Do not sandblast spark plug. Spark plug
should be cleaned by scraping or wire brushing and
washing with a commercial solvent.
DIRT AND COMBUSTIBLE DEBRIS.
Base
FIGURE 15.
CLEAN ENGINE
Clean engine periodically. Remove dirt and debris
with a cloth or brush. Cleaning with a forceful spray of
water is not recommended as water could contami
nate the fuel system.
Yearly or every 25 hours, whichever occurs first,
remove the air intake screen and blower housing, and
clean the areas shown in figure 16 to avoid over
speeding, overheating and engine damage. Clean
more often if necessary.
Filter
Wing
Nut
Cover
MUFFLER
Do not operate the chipper-vacuum without a muffler
or tamper with the exhaust system. Damaged mufflers
or spark arresters couid create a fire hazard. Inspect
periodically, and replace if necessary. If your engine
is equipped with a spark arrester screen assembly,
remove every 50 hours for cleaning and inspection.
Replace if damaged.
13
Page 14
STORAGE
Prepare your chipper-vacuum for storage at the end
of the season or if the unit will not be used for 30 days
or more.
WARNING: NEVER STORE MACHINE
WITH FUEL IN THE FUEL TANK INSIDE
▲
NOTE: A yearly check-up by your local Sears Service
Center is a good way to make certain your chipper-
vacuum will provide maximum performance for the
next season.
OF BUILDING WHERE FUMES MAY
REACH AN OPEN FLAME OR SPARK, OR
WHERE IGNITION SOURCES ARE
PRESENT SUCH AS HOT WATER AND
SPACE HEATERS, FURNACES, CLOTHES
DRYERS, STOVES, ELECTRIC MOTORS,
ETC=
CHIPPER-VACUUM
• Clean the chipper-vacuum thoroughly.
• Wipe unit with an oiled rag to prevent rust (use a
light oil or silicone).
ENGINE
IMPORTANT: IT IS IMPORTANT TO PREVENT
GUM DEPOSITS FROM FORMING IN ESSENTIAL
FUEL SYSTEM PARTS SUCH AS CARBURETOR,
FUEL FILTER, FUEL HOSE, OR TANK DURING
STORAGE. ALSO. EXPERIENCE INDICATES THAT
ALCOHOL BLENDED FUELS (CALLED QASOHOL
OR USING ETHANOL OR METHANOL) CAN
ATTRACT MOISTURE WHICH LEADS TO SEPARA
TION AND FORMATION OF ACIDS DURING
STORAGE. ACIDIC GAS CAN DAMAGE THE FUEL
SYSTEM OF AN ENGINE WHILE IN STORAGE.
• Drain the fuel tank.
• Start the engine and let it run until the fuel lines and
cahjurelor are empty.
• Never use engine or carburetor cleaner products in
the fuel tank or permanent damage may occur.
• Use fresh fuel next season.
NOTE: Fuel stabilizer is an acceptable alternative in
minimizing the formation of fuel gum deposits during
storage. Add stabilizer to gasoline in fuel tank or stor
age container. Always follow the mix ratio found on
stabilizer container. Run engine at least 10 minutes
after adding stabilizer to allow the stabilizer to reach
the carburetor. Do not drain the gas tank and carbure
tor if using fuel stabilizer.
® Drain all the oil from the crankcase (this should be
done after the engine has been operated and is still
warm) and refill the crankcase with fresh oil.
« If you have drained the fuel tank, protect the inside
of the engine as follows. Remove spark plug, pour
approximately 1/2 ounce (approximately one table
spoon) of engine oil into cylinder and crank slowly
to distribute oil. Replace spark plug.
OTHER
• Do not store gasoline from one season to another.
® Replace your gasoline can if your can starts to rust.
Rust and/or dirt in your gasoline will cause problems.
® Store unit in a clean, dry area. Do not store next to
corrosive materials, such as fertiiizer.
NOTE: if storing in an unventiiated or metal storage
shed, be certain to rustproof the equipment by coating
with a light oil or silicone.
SERVICE & ADJUSTMENT
WARNING: ALWAYS STOP ENGINE AND
DISCONNECT SPARK PLUG WIRE AND
A
REMOVING THE FLAIL SCREEN
If the discharge area becomes clogged, remove the
flail screen and clean area as follows.
• Stop the engine. Make certain the chipper-vacuum
has come to a complete stop. Disconnect the spark
plug wire before unclogging the discharge chute.
MOVE IT AWAY FROM SPARK PLUG
BEFORE PERFORMING ANY ADJUST
MENTS OR REPAIRS.
Remove the vacuum bag from the unit.
Remove the four self-tapping screws from the
bottom of the discharge chute, and the hex bolt, flat
washer and hex nut from the top. (Be careful not to
drop the hardware into the chute.) Remove the dis
charge chute assembly. See figure 18.
14
Page 15
Hex Bolt
Flat Washer
Hex Nut
Discharge
Chute
Assembly
/ 9 Self-Tapping
Screws
Belt
Cover
Seif-Tapping
Screws
FIGURE 18.
Remove the two hex bolts and hex nuts which
extend through the housing. Lift the flail screen
from inside the housing. See figure 19.
FIGURE 20.
• Remove the access plate by removing two hex lock
nuts. See figure 21.
• Clean the screen by scraping or washing with
water. Reinstall the screen.
NOTE: Be certain to reassemble the flail screen with
the curved side down as shown in figure 19.
SHARPENING OR REPLACING CHIPPER BLADES
• Disconnect the spark plug wire and move away
from the spark plug,
• Remove the flail screen as instructed in the previ
ous secflon.
• Remove the plastic belt cover on the front of the
engine by removing the two self-tapping screws.
See figure 20.
• Locate one of the chipper blades in the access
plate opening by rotating the impeller assembly by
hand. Remove the blade using a 3/16" alien
wrench on the outside of the blade and 1/2" wrench
on the impeller assembly, inside the housing.
Torque hardware to 250-350 inch pounds.
• Remove the other blade in the same manner.
Replace or sharpen blades. If sharpening, make
certain to remove an equal amount from each
biade. Reassemble in reverse order.
NOTE: Make certain blades are reassembled with the
sharp edge facing upward, as viewed from the access
plate opening.
15
Page 16
CHANGING THE FRICTION WHEEL RUBBER
The rubber on the friction wheel is subject to wear
and should be checked after 50 hours of operation,
and periodically thereafter. Replace friction wheel
rubber if any signs of wear or cracking are found.
• Drain the gasoline and oil from the chippervacuum.
• Tip the unit backward so it rests on the handles.
• Remove the frame cover by removing eight self
tapping screws from underneath the chippervacuum. See figure 22.
Remove the gear shaft from the unit by removing
the hex bolts, lock washers and flat washers from
each side of the frame. See figure 23. Hold the fric
tion wheel assembly, and slide the gear shaft out of
the unit toward the right side.
» Remove the six screws from the friction wheel
assembly (three from each side). Remove the fric
tion wheel rubber from between the friction wheel
plate.
® Reassemble new friction wheel rubber to the fric
tion wheel assembly, tightening the six screws in
rotation and with equal force.
« Slide the friction wheel assembly up onto the shift
mechanism, then slide the gear shaft back into the
unit. Reassemble in reverse order.
® Readjust the clutch cable. Refer to adjustment sec
tion.
CLUTCH CABLE ADJUSTMENT
To adjust the clutch cable, refer to the “Clutch Cable
Adjustment” section of Assembly Instructions.
SHIFT ROD ADJUSTMENT
If the shift rod needs adjustment to obtain forward or
reverse correctly, proceed as follows. See figure 24.
• Remove the bag from the unit.
® Remove the hairpin clip and flat washer from the
upper end of the shift rod. Pull the ferrule out of the
hole in the shift lever. (Make certain wave washer
remains in place on the ferrule.)
® Place the shift lever in 6th position (all the way to
the left).
® Push down on the shift rod. Thread the fermie up
or down the shift rod until the ferrule lines up with
the upper hole in the shift lever.
» Secure ferrule to shift lever with flat washer and
hairpin clip.
® if you cannot obtain proper adjustment, remove the
gasoline and oil from the engine. Tip the unit back
ward so it rests on the handle. Remove the bottom
frame cover. Check to see that all of the rubber on
the friction w'heel on the aluminum plate when the
shift lever is in the 6th position. Adjust the ferrule
on the shift rod as needed. Reassemble.
16
Page 17
BELT REMOVAL AND REPLACEMENT
WARNING; Disconnect the spark plug
wire and move away from the spark plug.
• Remove the plastic belt cover on the front of the
engine by removing two self-tapping screws. Refer
to figure 19.
• Drain the gasoline and oil from the chippervacuum.
• Tip the unit backward so that it rests on the
handles.
• Remove the frame cover by removing eight self
tapping screws from underneath the chippervacuum. Refer to figure 14.
• Remove the idler pulley bracket as follows. See
figure 25.
• Take the tension off the belt by pivoting the
idler pulley toward you, and line up the holes in
the idler bracket assembly. Insert a nail or simi
lar object through the holes to hold the idler
pulley in this position,
• Remove three seif-tapping screws, and lift off
the idler bracket assembly.
Support
CARBURETOR ADJUSTMENT
WARNING: IF ANY ADJUSTMENTS ARE
MADE TO THE ENGINE WHILE THE
A
The carburetor has been pre-set at the factory and
should not require adjustment. However, if your
engine does not operate properly due to suspected
carburetor problems, take your chipper-vacuum to
your nearest SEARS Service Center.
ENGINE IS RUNNING (E.G. CARBURE
TOR), KEEP CLEAR OF ALL MOVING
PARTS. BE CAREFUL OF HEATED SUR
FACES AND MUFFLER.
• Remove the hex bolt and lock washer from the
engine pulley. See figure 25. Slip the engine pulley
off the engine shaft, and remove the belt from the
pulley.
• Loosen the nut on the stop bolt until there is clear
ance between the support bracket and the friction
wheel disc. See figure 26.
• Slip the belt between the friction wheel and friction
wheel disc. Remove and replace belt. Reassemble
following instruction in reverse order.
NOTE: The support bracket must rest on the stop bolt
after the new belt has been assembled.
ENGINE SPEED
Your engine speed has been factory set. Do not
attempt to increase engine speed or it may result in
personal injury. If you believe the engine is running
too fast or too slow, take your chipper-vacuum to the
nearest SEARS Service Center for repair and adjust
ment. .
17
Page 18
TROUBLE SHOOTING
PROBLEM
Engine fails to start
Loss of power;
operation erratic
Engine overheats
Too much vibration
Unit does not
discharge
Rate of discharge
slows considerably or
composition of
discharged material
changes
POSSIBLE CAUSE(S)
• Fuel tank empty, or stale fuel.
• Spark plug wire disconnected.
• Faulty spark plug.
• Nozzle safety switch not depressed.
• Spark plug wire loose.
• Unit running on CHOKE.
• Blocked fuel line or stale fuel.
• Water or dirt in fuel system.
• Carburetor out of adjustment.
• Dirty air cleaner.
• Carburetor not adjusted
properly.
• Engine oil level low.
• Loose parts or damaged
impeller.
• Discharge chute clogged.
• Foreign object lodged in impeller.
• Vacuum bag is full.
• Chipper blades dull.
CORRECTIVE ACTION
• Fill tank with clean, fresh fuel.
• Connect wire to spark plug,
• Clean, adjust gap or replace.
• Adjust metal tab so it depresses the safety switch.
• Connect and tighten spark plug wire.
• Move choke lever to OFF position.
• Clean fuel Sine; fill tank with clean
fresh gasoline.
• Disconnect fuel line at carburetor to drain fuel
tank. Refill with fresh fuel.
• Adjust carburetor or contact your SEARS
Service Center.
• Service air cleaner. See Customer Responsibilities
section of this manual.
• Contact your SEARS Service Center.
• Fill crankcase with proper oil.
• Stop engine immediately and disconnect
spark plug wire. Tighten ali bolts and nuts.
Make ail necessary repairs. If vibration continues,
have unit serviced by a SEARS Senrice Center,
• Stop engine immediately and disconnect
spark plug wire. Clean flail screen and inside
of blower housing. See Service/Adjustments
section of this manual.
• Stop engine immediately and disconnect
spark plug wire. Remove lodged object.
• Empty bag.
• Sharpen or replace chipper blades.
NOTE: For repairs beyond the minor adjustments listed above, please contact your nearest SEARS Service Center.
HOW TO ORDER REPLACEMENT PARTS
Each chipper-vacuum has its own mode) number.
Each engine has its own model number.
The model number for your chipper-vacuum will be
found on a label attached to the frame.
The model number for the engine will be found on the
blower housing of the engine.
All parts listed herein may be ordered through Sears,
Roebuck and Co. Service Centers and most Retail
Stores.
WHEN ORDERING REPAIR PARTS, ALWAYS GIVE
THE FOLLOWING INFORMATION:
‘PRODUCT - “9 H.P. Chipper-Vacuum”
‘MODEL NUMBER - 247.799640
‘ENGINE MODEL NO. -143.959003
‘PART NUMBER
‘PART DESCRIPTION
Your Sears merchandise has added value when you
consider that Sears has service units nationwide
staffed with Sears trained technicians...professional
technicians specifically trained on Sears products,
having the parts, tools and the equipment to insure
that we meet our pledge to you...“we service what we
sell.”
IF YOU NEED REPAIR
SERVICE OR PARTS;
RE^PAIR SERVIOE
1-800-4-REPAIR
(1-800-473-7247)
ORDERING PARTS
1-800-FON-PART
{1-800-366-7278
18
Page 19
SEARS CRAFTSMAN 9 H.P. CHIPPER-VACUUM MODEL NO. 247.799640
Repair Parts
REP.
NO.
PART
NO,
1
1539-019
2
647-0019 CONTROLASSY
649-0008
3
4
649-0012
OE^RIPnON
PUSHNUT
HANDLE ASSY-UPPER 1
HANDLE ASSY-LOWER
5 681-0076 BRACKET ASSY-SHIFT
6 710-0116 SCREW-HEX
7
710-0380 SCREW-HEX
8 710-0621
9
710-0896 SCREW-HEX
710-3008 SCREW-HEX
10
11 711-0677
711-0737
12
13
712-0116 NUT-HEX LOCK
14 712-3004A
15 714-0104
SCREW-HEX
FERRULE
PIN-STUD
NUT-HEX LOCK
PIN-COTTER
QTY.
4
1 17
1
1
4 21
2
1 23
2
4
1
4 27
1
11 29
2
19
REF.
NO.
PART
NO.
16 720-0232
725-0157 CABLE TIE
18 736-0126
736-0264
19
20 736-0300
736-0413
22 736-0451
738-0560
24
738-0561
25 741-0402
26
746-0921
747-0626
28
781-0626
784-0297
DESCRIPTION
KNOB-SHIFT
WASHER-RUBBER
WASHER-FLAT
WASHER-FLAT
WASHER-SPRING
WASHER-SADDLE
SCREW-SHOULDER
NUT-SHOULDER
BEARING-FLANGE PLASTIC
CABLE-CLUTCH
ROD-SHIFT
COVER-SHIFT
HANDLE-SHIFT
QTY.
1
2
1
1
1
2
6
1
1
2
1
1
1
1
Page 20
SEARS CRAFTSMAN 9 H.P. CHIPPER-VACUUM MODEL NO. 247.799640
Repair Parts
REF.
NO,
PART
NO.
1 629-0241
681-0059
2
681-0060
3
710-0382
710-0604
5
710-0607
6
710-0772
7
712-1268
8
710-3008
9
712-0384
10
712-0421
11
712-3004A
12
DESCRIPTION
H ARNESS—C H1P PER-VAC
HOUSING ASSY—iNNER
HOUSING ASSY—OUTER
SCREW-HEX
SCREW-HEX SELF TAP
SCREW-HEX SELF TAP
SCREW-HEX
SCREW-HEX SELF TAP
SCREW-HEX
NUT-HEX LOCK
KNOB
NUT-HEX LOCK
QTY.
1
1 14
1 15
2 16
10
8 18
3 19
2
2 21
2
3
4
20
REF.
NO.
13
17
20
22
23
24
PART
NO.
712-3010
719-0326
723-0438
725-1700
725-3166
726-0272
731-1613
736-0119
736-0242
781-0598
781-0599
781-0627
DESCRIPTION
QTY.
NUT-HEX (GR 5)
SCREEN
SEAL-RUBBER
COVER-SWITCH 1
SNAP MOUNT SWITCH
CLAMP
COVER-SWITCH
WASHER-LOCK 3
WASHER-BELL
BLADE-FLAfL HOUSING
BLADE-FLAIL HOUSING
COVER-CHIPPER
3
1
2
1
1
1
3
1
1
1
Page 21
SEARS CRAFTSMAN 9 H.P. CHIPPER-VACUUM MODEL NO. 247.799640
Repair Parts
REF.
NO.
PART
NO.
DESCRIPTION
1 681-0078 IMPELLER ASSY COMP.
(INCL. REF. NOS. 2 THRU 12)
2 710-1273 SCREW-HEX 1
3 736-0217 WASHER-LOCK 1
4 736-0247 WASHER-FLAT 1
5 681-0078 IMPELLER ASSY 1
6 711-0833A PIN-CLEVIS
7 710-1054 SCREW-FLAT HEAD
8 712-0411 NUT-HEX LOCK
9 715-0249
PIN-ROLL SPRING
10 719-0329 BLADE-FLAIL
11
736-0119 WASHER-LOCK 4
12 742-0544 BLADE-CHIPPER
QTY.
1
3
4
4
3
3
4
REF.
NO.
2
PART
NO.
1
681-0068 CHUTE ASSEMBLY
710-0258
DESCRIPTION
SCREW HEX
3 712-3027 NUT-LOCK
4 731-1609
5 781-0625 BRACKET SUPPORT
—
731-1617
CHUTE -CHIPPER UPPER
TAMPER PLUG (Not Shown)
QTY.
1
5
5
1
1
1
REF.
NO.
1
2
3
NO.
631-0029
731-1616
764-0473
DESCRIPTION
NOZZLE ASS’Y.-VACUUM
CHUTE-DISCHARGE
BAG-VACUUM
QTY.
1
1
1
21
Page 22
SEARS CRAFTSMAN 9 H.P. CHIPPER-VACUUM MODEL NO. 247.799640
Repair Parts
REF.
NO.
10
11
12 754-0256
13
14
15
16
PART
NO.
710-0230
1
2 710-0723
710-0896
3
711-0758 ISIUT-HEX SHOULDER
4
712-0266
5
712-3004A
6
719-0330
7
731-1584
8
732-0745
9
736-0329
738-0908
DESCRIPTION
SCREW-HEX 1
SCREW-HEX
SCREW-HEX 5
NUT-HEX LOCK 1
NUT-HEX LOCK FLANGE 1
ADAPTER-MOUNTING
COVER-BELT 1
SPRING-TORSION 1
WASHER-LOCK
BOLT-IDLER
V-BELT 1
756-0313
756-0649
781-0611
781-0614
IDLER-FLAT
PULLEY
BRACKET-IDLER PIVOT
BRACKET-IDLER 1
QTY.
1
1
1
1
1
1
1
1
REF.
NO.
PART
NO.
1 681-0070
2 710-0520
710-0924
3
4 710-3008
711-1041
5
712-3004A
6
7 712-3005
8 714-0115
716-0104
9
720-0236
10
736-0270
11
736-0300
12
736-0369
13
738-0258
14
747-0631
15
750-0985
16
781-0605
17
DESCRIPTION
BRKT ASSY—WHEEL PIVOT
SCREW-HEX
SCREW-MACHINE PAN HD
SCREW-HEX
FERRULE—ADJUSTABLE
NUT-HEX FLANGE
NUT-HEX FLANGE LOCK
PIN-COTTER
RING-E
KNOB-PLASTIC
WASHER-BELL
WASHER-FLAT
WASHER-FLAT
SCREW-SHOULDER
ROD-ADJUSTABLE
SPACER
BRACKET-HEIGHT ADJ
QTY.
1
1
1
2
1
2
2
1
1
1
1
2
2
1
1
1
1
22
Page 23
SEARS CRAFTSMAN 9 H.P. CHIPPER-VACUUM MODEL NO. 247.799640
Rcpsir Pdrts
i;
23
Page 24
SEARS CRAFTSMAN 9 H.P. CHIPPER-VACUUM MODEL NO. 247.799640
Repair Parts
REF.
NO.
PART
NO.
1 618-0063
2 618-0168
656-0009
3
756-0564
738-0865
741-0600
4 681-0055
681-0058
5
681-0069
6
681-0072
7
881-0073
8
884-0042
9
710-0502A
10
11 710-0653
12 710-0788
710-0896
13
710-3008
14
711-1026
15
711-1028
16
712-0241 NUT-HEX
17
712-0711
18
712-3004A
19
DESCRIPTION
QTY.
REF.
NO.
BEARING ASSY-FRICTION 20
WHEEL
DIFFERENTIAL ASSY COMP.
DISC-FRICTION WHEEL
ASSY COMP.
1
1 22
1
21
23
24 716-0102
DISC-FRICTION WHEEL 25
BOLT-SHOULDER
BEARING-BALL
BRACKET ASSY-SUPPORT
BRACKET ASSY-AXLE
SHAFT ASSY-SHIFT
ARM ASSY-SHIFT
FRAME ASSY
WHEEL ASSY-FRICTION
SCREW-HEX SELF-TAP
SCREW-HEX WASHER
SCREW-HEX WASHER
SCREW-HEX
SCREW-HEX
SHAFT-HEX
SHAFT-JACK
NUT-HEX JAM
NUT-HEX FLANGE LOCK
2 29 736-0160
1 33
1
1
1 40
1 42 784-5590
26
27
1 28 736-0119
1 30
1
1 32 736-3089
4
31
34 741-0563
2 35
36
8
6
37
38
39
2
41 781-0612
5
PART
NO.
713-0330
DESCRIPTION
SPROCKET & HUB
713-0374 CHAIN
713-0415
714-0474
SPROCKET 11T
PIN-COTTER
RING-SNAP
716-0185
732-0264
736-0105
RING-SNAP
SPRING-EXTENSION 1
WASHER-BELL
WASHER-LOCK
WASHER-FLAT
736-0267
736-0287
WASHER-FLAT
WASHER-FLAT
WASHER-FLAT
738-0908 BOL I -lULhK
BEARING-BALL
748-0382 SPACER
750-0351
SLEEVE
750-0978 SPACER
750-0979
750-0980
750-0981
SPACER
SPACER
SPACER
COVER-FRAME
BRACKET-SHIFT
QTY.
1
1
1
1
2
1
3
2
1
2
4
2
1
2
1
1
1
1
1
1
1
1
1
PART
NO.
634-0100
REF.
NO.
634-0101
734-1598
711-1017
2
3 712-3005
4 714-0104
731-0981A
5
734-1793
6
736-0105
7
736-0232
8
738-0213
9
734-0255
10
DESCRIPTION
WHEEL ASSY COMPLETE
4"X 10"
RIM ASSY COMPLETE
TIRE PNEUMATIC 4" X 10"
PIN-CLEVIS
NUT-HEX FLANGE
PIN-COTTER
HUB CAP
WHEEL 2“ X 8"
WASHER-BELL
WASHER-WAVE
SCREW-SHOULDER
VALVE STEM
QTY.
2
2
2
2
2
2
2
2
2
2
2
2
24
Page 25
SEARS CRAFTSMAN 9 H.P. CHIPPER-VACUUM MODEL NO. 247.799640
Repair Parts
REF.
NO.
PART
NO.
1 618-0168
710-1206
2
711-1035
3
4 711-1037
711-1038
5
713-0445
6
716-0232
7
717-1358
8
717-1437
9
10 719-0333
719-0334
11
748-0383
12
13 737-0300
14
DESCRIPTION
DiFFERENTiAL ASSY
COMPLETE
SCREW-HEX
SHAFT-CROSS
AXLE-SHAFT 10.95" LONG 1
AXLE-SHAFT 9.82" LONG 1
SPROCKET 22 T 1
RING-RETAINING
(2 PER AXLE)
GEAR-DIFFERENTIAL 14T 2
GEAR-DIFFERENTIAL 10T 2
HOUSING-DIFFERENTIAL RH
HOUSING-DIFFERENTIAL LH 1
BEARING-FLANGE
GREASE
— ■
SEALANT-LOCTITE 5699
QTY.
1
4
1
4
1
2
1 OZ
REF.
NO.
1
PART
NO.
710-3008
DESCRIPTION
SCREW-HEX
2 712-3004A NUT-HEX LOCK FLANGE
3 726-0205
CLAMP-HOSE
4 751-0535-8 HOSE-FUEL LINE 8"
5 751-0603
6 751-0615
726-0209 CABLE TIE (NOT SHOWN) 1
—
CAP-FUEL
TANK-FUEL 1 GALLON
25
QTY.
2
2
2
1
1
1
Page 26
SEARS CRAFTSMAN 9 H.P. ENGINE MODEL NO. 143.959003
Repair Parts
400
261
282
281 V
iV
260
Page 27
SEARS CRAFTSMAN 9 H.P. ENGINE MODEL NO. 143.959003
Repair Parts
KEY
NO.
1 35385
PART
NO.
DESCRIPTION
Cylinder (ind. 2 & 20)
2 27652 Dowel Pin
4 32678
5 30969
15 30699C
Oil Drain Extension
Extension Cap
Governor Rod
(Incl. 15A& 15B)
15A 30700
15B
16
650494 Screw, 6-40 X 5/16"
33454
17 29916
18 650548
19 34663
Governor Yoke
Governor Lever
Governor Lever Clamp
Screw, 8-32x5/16"
Speed Control Spring
20 35319 Oil Seal
25 36460
26
650561
28 30322
30
36283
35 29826
36 29918
37 29216
38
29642 Retaining Ring
Blower Housing Bafffe
Screw, 1/4-20 x 5/8"
Lock Nut, 8-32 139 33369 Governor Gear Bracket
Crankshaft
Screw, 10-32 x 3/4" 149 27882 Valve Spring Cap
Lock Washer 149A 35862 Valve Spring Cap
Lock Nut, 10-32
40 34552 Piston, Pin & Ring Set (Std.)
40
34553
Piston, Pin & Ring Set
(.010* OS)
40
34554 Piston, Pin & Ring Set (.020" OS) 172 28425
41 34329A Piston & Pin Ass’y. (Std.) (Incl. 43)
41 34330A
Piston & Pin Ass’y. (.010" OS)
(Incl. 43)
41
34331A Piston & Pin Ass’y. (.020" OS)
(Incl. 43)
42
42 34333
42 34334
43 27888
45
34332 Ring Set (Std.) 185
Ring Set (.010” OS)
Ring Set (.020" OS) 200 34677
Piston Pin Retaining Ring 203
35373A
Connecting Rod Ass’y. (Incl. 46,
KEY
NO.
102 650872 Solid State Mounting Stud
103
110 35187
119
120 36449 Cylinder Head
125
125
126
126 34036
127
128 6S0690
129
130 650694A
135
140
150
151
169
170
171
173 35350 Breather Tube
174
178 29752
182 30088A
184
186 34661
204
47 & 49) 206
46
650908
47 650882
48
49
34034
35374
50 36569
60 33273A
65 650128
69 35262A
70
71
35445A
35377
72 27642 Oil Drain Plug
75 35319
80
81
31845
30590A Washer 260
Connecting Rod Bolt 207
Connecting Rod Bolt
Valve Lifter
Oil Dipper
Camshaft (MCR)
Blower Housing Extension
Screw, 10-24 x 1/2"
Cylinder Cover Gasket
Cylinder Cover (Inci. 71, 75 & 80)
Crankshaft Bushing
209 650821
215
223
224
238
239
240 33266
242
245
245A
Oil Seal
Governor Shaft
260 33269A
251
82 35378 Governor Gear Ass’y. (Incl. 81) 261 650788
83
30588A
Governor Spool
262
84 29193 Retaining Ring
86 650833 Screw, 1/4-20 x 1-3/16" 264A 650802
87 650832 Screw, 1/4-20x1-11/16" 265
89
32589
90 611090
92 650880
93 650881
100 35135
101 610118
Flywheel Key 275 34185B
Flywheel 276
Lock Washer 277
Flywheel Nut 281
Solid State ignition 282
Spark Plug Cover 285 35985B
PART
NO.
650814
36448
27878A
27880A
34035
650691 Washer
650738 Screw, 1/4-20 x 5/8"
33636
650836 Screw, 10-24 x 1/2
27881 Valve Spring
32581 Valve Spring Keeper
27896A Valve Cover Gasket
28423 Breather Body
28424 Breather Element
650128 Screw, 10-24 x 1/2"
33263
34707
31342 Compression Spring
650549
610973
33878
32410
660378
27915A
28820
27272A
33267
33268
35881 Air Cleaner Fitter
650513 Wing Nut, 1/4-20
333750
29747B
33272B Cylinder Head Cover
31588 Locking Plate
650729
33013
650760 Screw, 8-32x 3/8"
DESCRIPTION
Screw, TorxT-15, 10-24 x 1"
Ground Wire
Cylinder Head Gasket
Exhaust Valve (Std.) (Inci. 151)
Exhaust Valve (1/32" OS)
(Incl. 151)
Intake Valve (Std.) (Incl. 151)
Intake Valve 0/32“ OS) (Incl. 151)
Belleville Washer
Screw, 5/16-18x2"
Resistor Spark Plug (RJ17LM)
Valve Cover
Nut & Lock Washer, 1/4-28
Screw, 1/4-28 x 1"
Carburetor To Intake Pipe Gasket
Intake Pipe
Governor Link
Control Bracket (incl. 203 & 204)
Screw, 5-40 x 7/16"
Terminal
Throttle Link
Screw, 10-32 x 1/2"
Control Knob
Screw, Torx T-30, 5/16-18 x 1-1/8"
Intake Pipe Gasket
Screw, 10-32 X 1/2"
Air Cleaner Gasket
Air Cleaner Body
Air Cleaner Bracket
Air Cleaner Filter
Air Cleaner Cover
Blower Housing
Screw, 5/16-18x3/4"
Screw, Torx T-40, 5/16-24 x
21/32“
Screw, 1/4-20 X 5/8"
Muffler
Screw, 5/16-18 X 3-3/16"
Starter Bubble Cover
Starter Cup
27
Page 28
SEARS CRAFTSMAN 9 H.P. ENGINE MODEL NO. 143.959003
Repair Parts
KEY
NO.
286
287
PART
NO.
35446 Starter Screen
29752 Nut & Lock Washer, 1/4-28 370A 35703
290 30705 Fuel Line
DESCRIPTION
KEY
NO.
370
370B 35532 Logo Decal
292 26460 Fuel Line Clamp 370C
PART
NO.
36261
35274 Instruction Decal
296 34279B Starter Screen 380 632689
305
307
308
310 36205
325 29443
327
342
35554 Oil Fill Tube 390
35499
“0”-Ring
35540 Fill Tube Clip
Dipstick
Wire Clip
35392
30063
Starter Plug
Screw, Torx T-30, 1/4-20 x 1/2“
RPM Setting:
High Speed: 3450 to 3750
Low Speed; 1700
KEY
NO.
—
PART
NO.
632689 Carburetor (Incl. 184 of Engine
400
OPTIONAL SPARK ARRESTER
Part No. 34479A
DESCRIPTION
590671 Rewind Starter
Note: This engine could have been built
with 590704 starter. Refer to the design of the
air intake louvers for part identification.
Individual starter parts do not interchange.
36454
*(lncl. Part Nos. 27272A, 27896A, 27915A,
29673, 33263, 33629, 34698A, 35262 & 36448)
Parts List)
1 632243
632244 Throttle Return Spring
2
631184
4
631183
5
032517
6
7 650506
10
632249
11 632043
12
631184 Dust Seal Washer
13
831183 Dust Seal (Choke)
Throttle Shaft & Lever Assembly
Dust Seal Washer
Dust Seal (Throttle)
Throttle Shutter
Shutter Screw
Choke Shaft & Lever Assembly
Choke Return Spring
14 032248 Choke Shutter
15
16
17
630735
632164 Fuel Fitting
650417 Throttle Crack Screw/ldle Speed
Choke Positioning Spring
Screw
18
20
21
630766
632281
630766 Tension Spring
Tension Spring
idle Mixture Screw
22 630739 Idle Mixture Screw Washer
23
25
630740 Idle Mixture Screw “0”-Ring
631867 Float Bowl
27 631024 Float Shaft
28
29
30
632019 Float
631028 Float Bowl “0”-Ring
631021 Inlet Needle, Seat & Clip
(Incl. 31)
31
631022 Spring Clip
40 632239 Main Adj. Screw Ass’y. (Incl. 41
thru 44)
41 630740
High Speed Mixture Screw
“0”-Bing
42 630739
High Speed Mixture Screw
Washer
43 630738
High Speed Mixture Screw
Tension Spring
44 27110
47 630748
48
60
631027 Welch Plug, Atmospheric Vent
632347 Repair Kit* (Inci. Items Marked
Bowl Nut Washer
Welch Plug, Idle Mixture Well
PK in Notes)
Instruction Decai
Throttle Decal
Carburetor (inci, 184)
Gasket Set
28
Page 29
SEARS CRAFTSMAN 9 H.P. ENGINE MODEL NO. 143.959003
riCF'|h<fClll I Cll
PARTS LIST FOR RECOIL STARTER
KEY
NO.
—
2 590600 Washer
3
4
5 590678
6 590680
7 590412
8 590681
11
12
13
PART
NO.
590671
1 59G699A Spring Pin (Inei. 4)
Recoil Starter
DESCRIPTION
590679 Retainer
590601 Washer
Brake Spring
Starter Dog
Dog Spring
Pulley & Rewind Spring Ass’y.
590683
590456
590387
Starter Housing Ass’y-
Starter Rope (114" x 11/64” Dia.)
Starter Handle
PARTS LIST FOR RECOIL STARTER (OPTIONAL)
KEY
NO.
—
2
3 590696
4
5 590697
6
7
8
11
12
PART
NO.
DESCRIPTION
590704 Recoil Starter
1 590599A Spring Pin (Incl. 4)
590600 Washer
Retainer
590601 Washer
Brake Spring
590698 Starter Dog
590699 Dog Spring
590700
Pulley & Rewind Spring Ass’y.
590705 Starter Housing Ass’y.
590535 Starter Rope (98" x 9/64” Dia.)
13 590701 Starter Handle
29
O
-------
---
2
1
Page 30
Seal kits for the new cylinders are the same as for the old cylinders, as all the internal components are the same.
bore dram
4.0"
4.5"
To:
Re;
old cylinder
718-0307
718-0306
new c>1inder
718-0773
718-0769
seal kit
753-0490
753-0563
DISTRIBUTORS & AUTHORIZED SERVICE DEALERS
LOG SPLITTER SEAL KITS
As of February 1, 1999, log splitter cylinders under warranty capable of being repaired with a seal
kit must be repaired. Any cylinders replaced under warranty will be called back for inspection. Any
cylinder found to be repairable will be returned to the dealer and the dealer will be charged back the
amount paid on the claim for the cylinder. Labor already paid will not be charged back. If replacement is
determined to have been the only solution to the problem, no action will be taken. If you have any
questions regarding this policy or how to handle a situation please contact MTD service.
If you need a pressure test kit {part # 759-3742), contact your central distnbiitor. This kit includes
an instructiona! video and is available for loan or purchase. You will bs reimbursed for the cost of
shipping and handling on a warranty job if you used a test kit on loan and include the amount on the claim
form.
Seal kits are as follows.
CYLINDER NUMBER
^¿4 jgi 718-0306
sib 718-0307
718-0312
718-0313
CYLINDER Í.D.
4.5"
4.0"
4.25"
5.0"
SEAL KIT
753-0563
753-0490
753-0637
753-0564
Best Metal cylinders (thread on end cap):
CYLINDER NUMBER
718-0307
718-0313
CYLINDER LD.
4.0"
5.0"
SEAL KIT
753-0689
753-0691
Procedure for ReseaUng Hydraulic Cylinders
(On Machine - Fisher Cylinders - Snap-Ring Type)
1.
Clean cylinder, wedge and beam area.
2.
Fully retract cylinder rod into cylinder - stop engine.
3.
With engine off, move control valve back and forth several times to be sure there is no pressure in system.
4.
With a clean catch container in place, disconnect pump to control valve hose from pump fitting and insert end
into container. Plug fitting on pump with plastic cap or tape. This is to prevent dirt from entering fitting.
5.
Remove (4) bolts securing the log disiodger and remove dislodger.
6.
Remove 14 bolt through wedge and cylinder rod. Slide wedge all the way forward on the beam till it meets the
base plate. No need to remove wedge from beam.
7.
Lift rod up and place wood block under cylinder barrel to hold assembly at an angle, This will allow for rod
removal. ,
Place control valve into detent position '
9.
Using a wood dowel or a hammer handle, tap cylinder rod cap into cylinder just beyond the snap ring. Do not go
any farther than necessary as it will make further disassembly very difficutt. Remove snap nng from groove
being careful not to scratch groove or bore, [f you do, you must polish scratched area with fine emery so scratch
won t damage new seals as they pass the area. It is an easy job if you tap one end of snap ring into the cylinder ■
first, and then get a medium screwdriver under the ring to pry it out.
10,
Reconnect and tighten hose to pump.
Page 31
i 1 InipGrtsntí.!!! You must cicsn any paint or rust in the bore area by sanding it off. The paint will be from
the snap ring groove outward. Atter removing ALL paint and rust leaving a smooth surfacCj coat- exposed area
inside cylinder with grease, If youdo not do this, further disassembly will be difficult and damage may result
during reassembly!
USE EXTREME CAUTION DURING NEXT STEP!!!
12. Put control lever in neutral and start engine. Set en.glne at low idle speed, and use control valve lever to extend
rod out of cylinder until cylinder rod cap just starts to move. Put control lever in neutral, shut off engine and
disconnect spark plug wire.
13. Have someone hold control lever in extend position and pull engine starter rope to extend rod slowly until the
cylinder rod capean be pulled free of the cylinder. Do not remove end cap from rod.
14. Remove steel tube from fitting at end of cylinder and attach a %" I.D. hose to fitting on the cylinder using ahose
clamp. Place other end of hose into catch container.
15. Push rod into cylinder using cylinder rod cap as a guide. This will force oil out of cylinder through hose and into
container. Do not push turn down of rod into cylinder rod cap as damage to cap may result. Remove hose from
cylinder
16. You are now ready to pull rod and piston assembly from cylinder barrel. Be sure to have a piece of wood, thick
cardboard or pile of rags on the beam so that when you pull the rod out of the cylinder the piston won’t be
damaged by dropping down on the beam. Install a suitable bar or large screwdriver through bolt hole in rod and
pull rod, cylinder rod cap and piston out of cylinder.
17. Set rod and piston assembly on clean bench and with a light examine inside of cylinder barrel for gouges and
scratches. If scratches exist you should replace the complete cylinder. Do not attempt to hone cylinder as any
reduction of wall thickness can result in a safety problem, If no damage to cylinder is apparent, proceed with
repair.
18. Prop cylinder up as close to vertical as possible with a wood block.
19. Bolt rod to wedge ram placing a wood block under rod to keep piston from hitting beam. Remove nut from
piston end of rod and slide piston and cylinder rod cap off threaded end of rod.
20. Examine piston and rod cap for damage. Remove old seals, bearings and o-rings from rod, piston and cylinder
rod cap. Pay attention to alignment of seals as some are directional. Be very careful not to scratch the walls
of the seal grooves. Scratches can render the rod cap or piston unusable.
21. Using a tap and die or thread file, clean threads on rod and nut.
22. Cleanliness is vital throughout reassembly! Clean piston, rod, end cap and cylinder.
23. Lubricate seals and bearings with hydraulic oil and install them in end cap and piston.
24. Lubricate inside of cylinder rod cap and piston with general purpose grease and carefully install them on rod from
threaded end being careful to start wiper lip onto rod and then working cylinder rod cap on. Any attempt to
install the cap from the rod turn down end will result in seal lip damage.
25. Clean grease from exposed threads on rod and install piston nut on rod using red Loctite. Torque nut to
300 - 325 ft.-lbs. and restake in place to prevent the nut from backing off.
26. Remove rod assembly from wedge and set aside in a clean place being careful not to damage seals. Lower
cylinder to angle at which rod may be reinserted.
27. Lubricate inside of cylinder with hydraulic oil and grea.se the end cap and piston.
28. tasen piston into cylinder being careful to not damage seals. Slide assembly in until piston is approximately 12”
into barrel, then slide rod cap into cylinder and tap it in just past snap ring groove. Do not go farther than
necessary to install snap ring as damage to seals may occur. Install snap ring.
29. Place control valve in neutral. Reattach tube to cylinder and wedge to rod.
30. Add oil to tank to within 1” from top. Start engine and slowly cycle control valve several times to fill cylinder.
There will be a loud “POP" as cylinder rod cap seats over snap ring. (Cylinder may act jumpy until cylinder self
purges of air.) When cylinder is full, retract ram fully and stop engine. Top off oil to within 1.5” to 2” from top
of tank.
31. Remove wedge from rod and prop cylinder up again. Clean and paint area of cylinder bore you originally sanded.
32. Complete reassembly, cycle unit and check for leaks. If possible, test on a few logs.
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