White YARD BOSS 950 User manual

WHITER
Operator’s Manual
YARD BOSS 950
CHIPPER-VACUUM
IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY
Warning: This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-
covered, brush-covered or grass-covered land unless the engineis 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 effective 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 engine authorized
service dealer or contact the service department, P.O. Box 361131 Cleveland, Ohio 44136-9722.
WHITE OUTDOOR PRODUCTS COMPANY P.O. BOX 361131 CLEVELAND, OHIO 44136-9722
PRINTED IN U.S.A.
FORM NO. 770-10052A
(5/99)

SECTION 1: IMPORTANT SAFE OPERATION PRACTICES
A
WARNING: THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS WHICH, IF
NOT FOLLOWED, COULD ENDANGER THE PERSONAL SAFETY AND/OR PROPERTY OF
YOURSELF AND OTHERS. READ AND FOLLOW ALL INSTRUCTIONS IN THIS MANUAL
BEFORE ATTEMPTING TO OPERATE YOUR CHIPPER-VACUUM. FAILURE TO COMPLY WITH
THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY. WHEN YOU SEE THIS
SYMBOL-HEED ITS WARNING.
A
A
WARNING: The Engine Exhaust from this product contains chemicals known to the State of
California to cause cancer, birth defects or other reproductive harm.
DANGER: 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
operator can result in serious injury. This unit is capable of amputating fingers and hands and
throwing objects. Failure to observe the following safety instructions could result in serious injury or
death.
1. GENERAL OPERATION
• Read this operator’s manual carefully in its entirety
before attempting to assemble this machine. Read,
understand, and follow all instructions on the
machine and in the manual(s) before operation. 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 replacement 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 vegetation 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 supervision. 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 metal, 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 above shoulder length.
They can be caught in moving parts. Never operate
a unit in bare feet, sandals or sneakers. Wear
gloves when feeding material in the chipper chute.
• Do not operate the unit while under the influence of
alcohol or drugs.
• Do not overreach. 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 discharge 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 bag
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 continues 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 safety devices in place and
operating properly.
2

• 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
kickback from the chipper chute.
• Keep your face and body back from chipper chute
to avoid accidental 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
bum. Do not touch.
• Do not allow leaves or other debris to build up on
engine’s muffler. 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.
2. CHILDREN
Tragic accidents can occur if the operator is not alert to the
presence 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.
3. SERVICE
• Use extreme care in handling gasoline and other
fuels. They are extremely flammable and the
vapors are explosive.
• Store fuel and oil in approved containers, away
from heat and open flame, and out of the reach of
children.
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 ail 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 all 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 all 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, disconnect 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. Overspeeding the
engine is dangerous and will cause damage to the
engine and to other moving parts of the machine.
Check the vacuum bag frequently for wear.
Replace if worn or damaged.
Keep vacuum bag free of debris when not in use.
power machine to persons who
manual and on the machine.
A
WARNING - YOUR RESPONSIBILITY: Restrict the use of this
read, understand and follow the warnings and instructions in this
3

SECTION 2: SAFETY LABELS FOUND ON YOUR UNIT.
I - '
i
ROTATING BLADES INSIDE. KEEP HANDS AWAY FROM ALL OPENINGS. DO NOT
REMOVE OR ATTACH NOZZLE OR OPTIONAL HOSE KIT WHEN ENGINE IS RUNNING! ,
S30183I
A DANGER
ROTATING CUTTING BLADES.
KEEP HANDS AND FEET OUT
OF OPENINGS WHILE MACHINE
IS RUNNING. S30181
DO NOT OPERATE THIS UNIT WITHOUT
ENTIRE BAG AND DISCHARGE CHUTE
IN PLACE. TURN THE ENGINE OFF AND
ALLOW THE IMPELLER TO COME TO A
COMPLETE STOP BEFORE REMOVING
THE BAG. S30i3i|
A WARNING
TO AVOID SERIOUS INJURY
♦ Read Owner's Manual and all safety labels on machine before starting and using machine.
♦ Keep hands, feet, face, long hair and clothing out of chipper inlet, vac Inlet, and discharge
area. There are ROTATING BLADES inside these openings.
♦ Wear approved safety glasses and gloves. Avoid loose fitting clothes.
♦ Keep the area of operation clear of all persons, particularly small children and pets.
♦ Keep all shields and guards (e.g. upper chipper chute extension, discharge chute, nozzle
assembly) In place and securely attached.
♦ Check bag frequently for wear. Replace if worn or damaged.
♦ If unit becomes clogged or jammed, shut off engine right away. Do not attempt to dear
clog or jam with engine running. Refer to Maintenance Section of Owner's Manual for
unclogging instructions.
♦ Muffler and engine get hot and can cause burns. Do not touch. To avoid a fire hazard, ^
keep leaves, grass, and other
combustible debris off hot muffler a
and engine. a
♦ Do not attempt to remove or attach a
vac nozzle or optional Hose Kit a
with engine running. Do not a
operate unit unless nozzle or a
optional Hose Kit is secured a
in place. a
♦ Do not fill gas tank while a
engine is running. a
Allow eng ine to cool at a
least 2 minutes a
before re-fueling. a

SECTION 3: FINDING YOUR MODEL NUMBER
This Operator’s Manual is an important part of your new chipper-vacuum. It will help you assemble, prepare and
maintain your chipper-vacuum. Please read and understand what it says.
Before you prepare your chipper-vacuum for its first use, please locate the model plate and copy the information
from it in this Operator’s Manual. The information on the model plate is very important if you need help from
your dealer or the Customer Support Department.
• Every chipper-vacuum has a model plate. You can locate it by standing behind the unit in the operating
position and looking down at the frame just below the engine.
• The model plate will look like this.
1
11 n o wiieic; yuui muuei iiurriud win ue.
This is where vour serial number will he
xxx-x-xxx-x-xxx xxxxxxxxxxx
WHITE OUTDOOR
UUmTE PRODUCTS COMPANY
WMTTEW P.O. BOX 361131
Copy the model number here:
Copy the serial number here:
CLEVELAND, OHIO 44136 V
SECTION 4: CALLING WARRANTY SERVICE
If you are having difficulty assembling this product or if you have any question regarding the controls, operation
or maintenance of this chipper-vaccum, please call the Customer Dealer Referral Line. You can reach them by
calling:
1-800-949-4483
Before calling your local dealer, make sure that you have your model and serial numbers ready. By having the
model and serial numbers ready, you help your local dealer give you faster service. To find your units model
and serial number, see SECTION 3: FINDING YOUR MODEL NUMBER.
5

SECTION 5: ASSEMBLY INSTRUCTIONS
Huh Cans
Figure 1
Figure 2
Wing Nuts
IMPORTANT: This unit is shipped WITHOUT
GASOLINE or OIL in the engine. After assembly,
see separate engine 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.
TO REMOVE CHIPPER-VACUUM FROM
CARTON
1. Remove staples, break glue on top flaps, or cut
tape at carton end and peel along top flap to open
carton.
2. Remove loose parts if included with unit (i.e.,
operator’s manual, etc.).
3. Cut corners and lay carton down flat.
4. Remove packing material.
5. Push down on handle to lift the front of the
chipper-vacuum, and roil unit out of carton. Check
carton thoroughly for loose parts.
TOOLS REQUIRED FOR ASSEMBLY
(1) 3/4" Open End Wrench* (2) 1/2” Wrenches*
(1) Funnel (1) 9/16" Wrench*
(1) Set of Pliers (2) 7/16“ Wrenches*
‘Adjustable wrenches may be used.
LOOSE PARTS IN CARTON (See Figure 1)
(2) Front Wheels
(2) Hub Caps
(1) Nozzle
(1) Chipper Chute
(1) Support Bracket
tNot Shown
(1) Bag
(1) Shift Knobf
(1) Tamper Plugf (Opt.)
(1) Safety Glassesf
ATTACHING THE FRONT WHEELS
1. 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.
2. Remove the hex lock nuts and shoulder bolts from
the front of the wheel brackets. See Figure 2.
3. 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.
4. Place cupped washer on shoulder bolt (crowned
side of washer goes against the wheel).
5. Assemble wheel to outside of wheel bracket.
Secure hex lock nut. Tighten.
6. Attach hub caps to wheels by placing in position
against the inner hub of the wheel. Press firmly
around the center portion of hub cap in a circular
motion, similar to installing a lid on a round, plastic
container. The hub caps are flexible and will snap
over the wheel hubs.
ATTACHING THE NOZZLE (See Figure 3)
1. Remove three wing nuts from the front of the
chipper-vacuum. Place nozzle in position over the
three studs. Secure with wing nuts just removed.
NOTE: The metal tab on the nozzle must depress the
safety switch on the front of the chipper-vacuum or the
engine will not start.
2. Set unit in upright position.
6

ATTACHING THE CHIPPER CHUTE AND
SUPPORT BRACKET (See Figure 4)
1. Remove the two hex bolts, flat washers and nuts
which are attached to the support bracket.
2. 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.
3. Remove the two hex lock nuts from the hex bolts
which secure the right side of the upper handle to
the lower handle. Leave bolts and washers in
place.
4. Remove three cupped washers and 5/16“ hex
nuts from the weld studs beside the opening on
the right side of the chipper-vacuum.
5. Place the chipper chute in position over the weld
studs (slot goes at the bottom). Secure with
cupped washers and hex nuts just removed.
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.
Hex Nuts
Figure 5
Drive
6. 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.
7. Tighten all hardware securely on the chipper
chute, support bracket and handle.
ATTACHING THE CLUTCH CABLE
The clutch cable has been partially assembled at the
factory. You will have to attach the clutch cable, to
the handle.
1. Loosen the hex nuts at the cable bracket and
back the bottom hex nut all the way down.
2. Holding the drive clutch handle up, hook the “Z”
end of the cable into the drive clutch handle from
the outside to the inside. See Figure 5. Pliers will
aid in assembly.
CLUTCH CABLE ADJUSTMENT
Adjust the hex nuts at the cable bracket so there is
no slack in the cable, but the cable is NOT tight. Do
not overtighten the cable. See Figure 5.
To check the clutch adjustment, proceed as follows.
1. Push the chipper-vacuum backward and forward
with the drive clutch handle released. It should
move freely.
2. If it does not, loosen both hex nuts at the cable
bracket. See Figure 5. Turn bottom nut
clockwise to loosen the cable.
3. Engage the drive clutch handle (hold against
upper handle), and try to push chipper-vacuum
backward and forward. The wheels should lock
up.
4. If the wheels do not lock up, loosen both hex
nuts at the cable bracket. Turn bottom nut
counterclockwise to tighten the cable.
5. Recheck adjustment. Tighten both hex nuts
when correct adjustment is reached.
Figure 6

ATTACHING THE BAG
1. Place bag inside of handle assembly. Slip the
opening on the bag over the discharge chute,
making certain it is over the rib on the discharge
chute. See Figure 6.
2. Place the four straps on the top of the bag over
upper handle, hooking them on studs. See
Figure 7. Be sure the bag goes under the drive
clutch handle.
3. Squeeze the clamp on the drawstring, and pull
the drawstring tight. Release the clamp.
INSTALLING THE SHIFT KNOB
Thread the shift knob onto the end of the shift lever.
TAMPER PLUG (IF EQUIPPED)
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.
NOTE: Tamper plug should remain in the chipper
chute whenever the chipper chute is not in use.
SECTION 6: OPERATION
BEFORE USING YOUR CHIPPER-VACUUM, REFER TO THE "SAFETY RULES” AS SHOWN ON PAGES
2 AND 3 OF THIS MANUAL. ALWAYS BE CAREFUL.
The operation of any chipper-vacuum can result in foreign objects being thrown into the eyes,
which can damage your eyes severely. Always wear the safety glasses provided with this
unit or eye shields before chipping, or while performing any adjustments or repairs.
We recommend Wide Vision Safety Mask for over spectacles or standard glasses.
CONTROLS (See Figure 9)
SHIFT LEVER—The shift lever determines ground
speed of your unit. It may be placed in one of eight
positions. Of these eight, six positions are to go
forward, and two positions are to go in reverse.
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
Squeezing the drive clutch handle against the upper
handle engages the wheel drive. Release the drive
clutch handle to stop the wheel drive.
8

GAS AND OIL FILL-UP
Service the engine with gasoline and oil as
instructed in the separate engine manual packed
with your chipper-vacuum. Read instructions
carefully.
NOTE: Your chipper-vacuum is shipped without oil;
however, a small amount of oil may be present from
the factory. Do not overfill.
A WARNING: Never fill fuel tank indoors,
with engine running or while engine is hot.
Do not smoke when filling fuel tank.
TO START ENGINE
IMPORTANT: If unit shows any sign of motion
with the clutch handle disengaged, shut engine off
immediately. Readjust as instructed in the “Clutch
Cable Adjustment” section of the Assembly
Instructions.
WARNING: Be sure no one other than
A the operator is standing near the chipper-
vacuum while starting or operating. Do not
operate this chipper-vacuum unless the
nozzle, discharge chute and bag have
been properly installed.
NOTE: Your chipper-vacuum unit has a safety
switch at the front of the housing. The nozzle or
optional hose attachment must be in place on the
chipper-vacuum before the engine can be started.
1. Attach spark plug wire to spark plug.
2. Make certain drive clutch handle is in the
disengaged (released) position.
3. Engines with choke lever: Move choke lever
on engine to CHOKE position. (A warm engine
may not require choking.)
Engines with primer: Prime engine as
instructed in separate engine manual.
4. M ove throttle control lever on engine to FAST
position.
5. P lace one foot on the left rear wheel to prevent
the unit from skidding while starting.
6. G r asp 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.
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 part of the shredding
mechanism falling 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.
7. P u ll rope with a rapid, continuous, full arm
stroke. Keep a firm grip on starter handle. Let
rope rewind slowly. Do not let starter handle
snap back against starter.
8. R e p e a t instructions 6 and 7 until engine fires.
When engine starts, move choke control (if so
equipped) gradually to RUN position.
TO STOP ENGINE
1. To stop engine, move throttle control lever to
OFF position.
2. Disconnect spark plug wire and ground to
prevent accidental starting while equipment is
unattended.
TO EMPTY BAG
Open the large zipper on the bag to empty the bag.
See Figure 10. Be certain the zipper is closed
when operating the unit.
Figure 10
TO ENGAGE DRIVE
IMPORTANT: Always release the drive clutch
handle before moving the shift lever.
With the engine running at top speed, move shift
lever into one of the six FORWARD positions or two
REVERSE positions. Select a speed appropriate 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 slowly to prevent front wheels
from lifting up.
HOW TO USE THE CHIPPER
Do not attempt to shred or chip any material other
than vegetation 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.
9

Figure 11
CARBURETOR ADJUSTMENT
WARNING: Material up to a
maximum of 3" in diameter may be fed
into the chipper chute. Do not attempt
to shred or chip any material larger
than 3" in diameter. Personal injury or
damage to the machine could result.
Use the tamper plug (if so equipped) 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.
IMPORTANT: There is a flail screen located
inside the housing in the discharge area. If the flail
screen becomes clogged, remove and clean as
instructed in the Maintenance section on page 11.
For best performance, it is important to keep the
chipper blades sharp. Refer to Maintenance section,
page 11. 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.
SECTION 7: ADJUSTMENTS
WARNING: Do not at any time make
any adjustment to the unit without first
stopping engine and disconnecting spark
plug wire.
HEIGHT ADJUSTMENT
The height adjustment knob is located on the right
hand side of the chipper-vacuum. See figure 12.
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 best height for the nozzle will vary according to
the conditions. Adjust the height of the nozzle to find
the setting which gives the best performance for the
operating conditions. In general, raise the nozzle to
vacuum a thick layer of leaves; lower the nozzle for
smooth surfaces.
WARNING: If any adjustments are
A made to the engine while the engine is
running (e.g., carburetor), keep clear of
all moving parts. Be careful of heated
surfaces and muffler.
Minor carburetor adjustment may be required to
compensate for differences in fuel, temperature,
altitude or load. Do not make unnecessary
adjustments. Factory settings are satisfactory for
most applications and conditions. If adjustment is
needed, refer to the separate engine manual packed
with your chipper-vacuum.
NOTE: A dirty air cleaner will cause engine to run
rough. Be certain air cleaner is clean and attached to
the carburetor before adjusting carburetor.
CLUTCH CABLE ADJUSTMENT
To adjust the clutch cable, refer to the “Clutch Cable
Adjustment” section of Assembly Instructions.
10

SHIFT ROD ADJUSTMENT
If the shift rod needs adjustment to obtain forward or
reverse correctly, proceed as follows. See Figure 13.
1. Remove the bag from the unit.
2. 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.)
3. Place the shift lever in 6th position (all the way to
the left).
4. Push down on the shift rod. Thread the ferrule
up or down the shift rod until the ferrule lines up
with the upper hole in the shift lever.
5. Secure ferrule to shift lever with flat washer and
hairpin clip.
Figure 13

SHARPENING OR REPLACING CHIPPER
BLADES
1. Disconnect the spark plug wire and move away
from the spark plug.
2. Remove the flail screen as instructed in the
previous section.
3. Remove the plastic belt cover on the front of the
engine by removing the two self-tapping screws.
See Figure 16.
4. Remove the access plate by removing two hex
lock nuts. See Figure 17.
Figure 17
5. 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 250-300 inch
pounds.
6. Remove the other blade in the same manner.
Replace or sharpen blades. If sharpening, make
certain to remove an equal amount from each
blade. Reassemble in reverse order.
NOTE: Make certain blades are reassembled with
the sharp edge facing upward, as viewed from the
access plate opening.
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.
1. Drain the gasoline and oil from the chipper-
vacuum.
2. Tip the unit backward so it rests on the handles.
3. Remove the frame cover by removing eight self¬
tapping screws from underneath the chipper-
vacuum. See Figure 18.
4. Remove the hex shaft from the unit by removing
the hex bolts, lock washers and flat washers
from each side of the frame. See Figure 19. Hold
the friction wheel assembly, and slide the hex
shaft out of the unit toward the right side.
5. Remove the six screws from the friction wheel
assembly {three from each side). Remove the
friction wheel rubber from between the friction
wheel plate.
6. Reassemble new friction wheel rubber to the
friction wheel assembly, tightening the six
screws in rotation and with equal force.
7. Slide the friction wheel assembly up onto the
shift mechanism, then slide the hex shaft back
into the unit. Reassemble in reverse order.
8. Readjust the clutch cable. Refer to adjustment
section.
12

BELT REMOVAL AND REPLACEMENT
A WARNING: Disconnect the spark plug
wire and move away from the spark
plug.
1. Remove the plastic belt cover on the front of the
engine by removing two self-tapping screws.
Refer to Figure 16.
2. Drain the gasoline and oil from the chipper-
vacuum.
3. Tip the unit backward so that it rests on the
handles.
4. Remove the frame cover by removing eight self¬
tapping screws from underneath the chipper-
vacuum. Refer to Figure 18.
5. Remove the idler pulley bracket as follows. {See
Figure 20.)
a. 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
similar object through the holes to hold the
idler pulley in this position.
b. Remove three self-tapping screws, and lift off
the idler bracket assembly.
6. Remove the hex bolt and lock washer from the
engine pulley. See Figure 20. Slip the engine
pulley off the engine shaft, and remove the belt
from the pulley.
7. Loosen the nut on the stop bolt until there is
clearance between the support bracket and the
friction wheel disc. See Figure 21.
8. 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.
Support
Stop Bolt Bracket
Figure 20
SECTION 9: OFF-SEASON STORAGE
The following steps should be taken to prepare your
chipper-vacuum for storage.
1. Remove all dirt from exterior of engine and
equipment.
2. Refer to engine manual for correct engine
storage instructions.
3. Wipe unit with an oiled rag to prevent rust (use a
light oil or silicone), especially if storing in an
unventilated or metal storage shed.
4. Store in a dry, clean area. Do not store next to
corrosive materials, such as fertilizer.
13

SECTION 10: TROUBLE SHOOTING GUIDE
Trouble
Possible Cause(s)
Corrective Action
Engine fails to start
Dirty aircleaner.
Fuel tank empty or stale fuel.
Spark plug wire
disconnected.
Cannot pull recoil cord.
Choke not in ON position.
Faulty spark plug.
Nozzle safety switch not
depressed.
Refer to the engine manual packed with your unit.
Fill tank with clean, fresh gasoline. Fuel will not last over
thirty days unless a fuel stabilizer is added.
Connect wire to spark plug.
Obstruction lodged in impeller Stop immediately and dis¬
connect spark plug wire. Remove lodged object.
Move switch to ON position.
Clean, adjust gap or replace.
Adjust metal tab so it depresses the safety switch.
Loss of power; operation
erratic
Spark plug wire loose.
Unit running on CHOKE.
Blocked fuel line or stale fuel.
Water or dirt in fuel system.
Carburetor out of adjustment.
Low engine RPM.
Dirty air cleaner.
Connect and tighten spark plug wire.
Move choke lever to OFF position.
Clean fuel line; fill tank with clean fresh gasoline. Fuel will
not last over thirty days unless a fuel stabilizer is used.
Disconnect fuel line at carburetor to drain fuel tank. Refill
with fresh fuel.
Refer to the engine manual packed with your unit.
Always run engine at full throttle.
Refer to the engine manual packed with your unit.
Engine overheats
Carburetor not adjusted
properly.
Dirty aircleaner.
Engine oil level low.
Refer to the engine manual packed with your unit.
Refer to the engine manual packed with your unit.
Fill crankcase with proper oil.
Too much vibration
Loose parts or damaged
impeller.
Stop engine immediately and disconnect spark plug wire.
Have unit serviced by a an authorized service dealer.
Unit does not discharge
Discharge chute clogged.
Foreign object lodged in
impeller
Low engine RPM.
Vacuum bag is full.
Stop engine immediately and disconnect spark plug wire.
Clean flail screen and inside of blower housing. See
Maintenance section of this manual.
Stop engine immediately and disconnect spark plug wire.
Remove lodged object.
Always run engine at full throttle.
Empty bag.
Rate of discharge slows
considerably or
composition of discharged
material changes
Low engine RPM.
Chipper blades dull.
Always run engine at full throttle.
Replace chipper blades or see your authorized service
dealer.
Note: For repairs beyond the minor adjustments above, contact your local authorized sen/ice dealer.
14

SECTION 11: ILLUSTRATED PARTS
YARD BOSS 950
REF.
NO.
PART
NUMBER
DESCRIPTION
QTY
REF.
NO.
PART
NUMBER
DESCRIPTION
QTY
1
1539-019
Nut, Push, .25
4
18
736-0300
Washer, Flat, .406 x .875x.059
1
2
747-1133-0662
Control Assembly, Clutch
1
19
736-0413
Washer, Spring, .390 x .62
2
3
749-1083-0662
Handle Assembly, Upper
1
20
736-0451
Washer, Saddle, .320 x .93
6
4
649-0012-0662
Handle Assembly, Lower
1
21
710-0495
Carr. Boll 1/4-20 x 1.75” Lg.
1
5
681-0076-0662
Bracket Assembly, Shift
1
22
750-1185
Spacer
1
6
710-3103
Screw, Hex Cap, 5/16-18 x 2.0
6 23
726-0135
Nut, Cap Speed
1
7
710-0896
Screw, Hex Wash Hd,4-14x
2
24
746-1080
Cable, Clutch
1
8
710-3008
Screw, Hex Cap 5/16-18 x .75
5
25
747-0626
Rod, Shift
1
9
711-0677
Ferrule
1
26
781-0626-0662
Cover, Shift
1
10
711-0737
Pin, Stud, .250 x 1.75
4
27
784-0297A
Handle, Shift
1
11
712-0116
Nut, Hx Ins.Jam Lk. 3/8-24Thd
1
28
781-015 7
Bracket, Cable Mtg.
1
12
712-3004A
Nut, Hex Flange Lock 5/16-18
11
29
736-3020
Washet, Flat .271 x .63 x .65
1
13 714-0104
Pin, Internal Cotter
2
30
712-0442
Nut, Lock, Acorn 1/4-20
1
14
720-0232
Knob, Shift
1
31
736-0275
Washer, Flat 5/16
1
15 725-0157
Cable Tie
1
16
735-0126
Rubber Washer
1
17
736-0117
Washer, Flat .385 x .62 x .6
1
15

YARD BOSS 950
REF.
NO.
PART
NUMBER
DESCRIPTION
QTY.
REF.
NO.
PART
NUMBER
DESCRIPTION
1
629-0241
Harness, Wire
1
14 712-3010
Nut, Hex, 5/16-18
3
2
681-0059-0662
Housing Ass’y. Inner Flail
1
15
719-0326
Screen, Discharge
1
3
681-0060-0662
Housing Ass’y, Outer Flail
1
16
723-0438
Rubber Seal
2
4
710-0382
Screw, Hex Cap, 1/2-13 x 5.0
2 17
725-1700
Cover, Switch
1
5
710-0604
Screw, Hex Wash Hd Tapp 5/16-18 x .62
10
18 725-3166
Switch, Snap Mount
1
6
710-0607
Screw, Hex Wash Hd Tapp 5/16-18 x .50
8
19
726-0272
Clamp
1
7
710-0772
Screw, Hex Cap, 5/16-24 x 2 GR5
3 20
731-1613
Cover, Safety Switch Mtg.
1
9 710-1268
Screw, Hex Wash Hd Tapp #10-16 x .38
21 736-0119
Washer, Lock, 5/16
3
10
710-3008
Screw, Hex Cap, 5/16-18 x .75 GR5
2
22
736-0242
Washer, Bell, .345 x .88 x .06
3
11
712-0384
Nul, Hex Center Lock, 1/2-13
2 23
781-0598
Blade, Lower Shredder
1
12
712-0421
Knob, 5/16-18
2
24 781-0599
Blade, Upper Shredder
1
13
712-3004A
Nut, Hex Flange Lock, 5/16-18
3
25
781-0627
Cover, Chipper Blade
1
REF.
NO.
PART
NUMBER
DESCRIPTION
QTY.
1
681-0068-0662
Chute Assembly, Chipper
1
2
710-0751
Screw, Hex Cap, 1/4-20 x .625
5
3
712-3027
Nut, Hex Flange Lock, 1/4-20
5
4 731-1609
Chute, Chipper
1
5
781-0625-0662
Bracket, Chipper Chute Support
1
6
736-0173
Washer, Flat, .28 x .74 x .63
5
7
735-0249
Flap, Chipper Chute
1
8
781-0633
Strip, Chute Flap
1
9
728-0175
Rivet, Pop, .156 x .504
3
—
731-1617
Tamper Plug (Optional - Not Shown]
1
16

YARD BOSS 950
3
REF.
NO.
PART
NUMBER
DESCRIPTION
QTY.
1
710-0230
Screw, Hex Cap, 1/4-28 x .50
1
2
710-0723
Screw, Hex Cap, 3/8-16 x 1.25
1
3
710-0896
Screw, Hex Wash Hd Tapp. 1/4-
14 x.625
5
4
710-0646
Screw, Hex Cap, 5/16-18 x 2.0
1
5
712-0266
Nut, Hex Cent-L Jam, 3/8-16
1
6
712-3004A
Nut, Hex Flange Lock, 5/16-18
2
7
719-0330A
Adapter, Engine Mtg
1
8
731-1584
Belt Cover
1
9
732-0745
Spring, Torsion, .54 x 1.0
1
10
736-0329
Washer, Lock, 1/4
1
11
748-0234
Shoulder Spacer, ,50 ID x .27 Lg
1
12
754-0256
V-Belt, 3/8 x 29.0 Lg
1
13
756-0313
Pulley, Flat Idler
1
14
756-0987
Pulley Half, 2.0 Dia
1
15
756-0986
Pulley Half, 2.0 Dia
1
16
781-0611-0662
Bracket, Idler Pivot
1
17
781-0614
Bracket, Idler
1
REF.
NO.
PART
NUMBER
DESCRIPTION
QTY.
1
681-0096-0662
Bracket Ass’y, Wheel Pivot
1
3
710-0924
Screw, Pan Hd Mach, 1/4-20 x .75
1
4
710-3008
Screw, Hex Cap, 5/16-18 x .75 GR5
2
5
711-1041
Ferrule, Adjustment
1
6
712-0431
Nut, Hex Flange Lock, 3/8-16
2
7
712-3004A
Nut, Hex Flange Lock, 5/16-18
2
8
714-0115
Pin, Cotter, 1/8 x 1.0
1
9
716-0104
E-Ring, .50 Dia
1
10
720-0236
Knob
1
11
732-0645
Spring, Compression
1
12
736-0247
Washer, Flat, .406 x M/4
2
13
736-0270
Washer, Bell, .265 x .75 x .062
1
14
736-0300
Washer, Flat, .406 x .875 x .059
1
15
736-0369
Washer, Flat, .508 x 1.0 x .020
2
16
738-0955
Shoulder Bolt, .75 x .43: 3/8-16
2
17
747-0631
Rod, Height Adjustment
1
18
711-0242
Spacer, .380 ID x 1.0 OD x .32 Lg
1
19
781-0605-0662
Bracket, Height Adj
1
17

YARD BOSS 950
REF.
NO.
PART
NUMBER
DESCRIPTION
QTY.
1
681-0078
Impeller Ass’y, Complete Includes
Ref. Nos. 5 thru 13
1
2 710-1273
Screw, Hex Cap, 3/8-24 x 2.75 GR5
1
3
736-0217
Washer, Lock, 3/8 Heavy Duty 1
1
4
736-0247
Washer, Flat, .406 x 1-1/4 HD1
1
5
681-0052
Impeller Assembly
1
6
711-0833B
Pin, Clevis
3
7
710-1054
Screw, Flat Hd. Cap, 5/16-24 x 1.0
4
8
712-0411
Nut, Hex Insert Lock, 5/16-24
4
9
715-0166
Pin, Spiral, 5/32 x 1.125
3
10
719-0329
Blade, Flail
3
11
736-0119
Washer, Lock, 5/16
4
12
742-0544
Blade, Chipper
2
13
781-0735
Pin Retaining Clip
3
REF.
NO.
PART
NUMBER
DESCRIPTION
QTY.
1
631-0028
Nozzle Assembly, Vacuum
1
2
731-1573
Chute, Discharge
1
3
764-0472
Bag, Vacuum
1
Labels found on your unit.
PART
NUMBER
DESCRIPTION
777S30181
777120350
777120351
777S30183
777S30041
777120354
777D00299
777D00092
777D00093
Label—Danger Top of Chipper Chute
Label—Squeeze Bail
Label—Raise, Lower
Label—Warning Top Flail Housing
Label—Warning Back Flail Housing
Label—6 Speed
Label—Hubcaps
Label—950 Front of Housing
Label—9 HP White
18

YARD BOSS 950
REF.
NO.
PART
NUMBER
DESCRIPTION
QTY.
1
618-0168
Differential Ass’y Complete
1
2
710-1206
Screw, Hex Wash Hd Tapp 1/4-20
4
3
711-1035
x 2-5/16
Cross Shaft
1
4
711-1037
Axle Shaft, .75 x 10.95
1
5
711-1038
Axle Shaft, .75 x 9.82
1
6
713-0445
Spocket, 22T
1
7
716-0232
Ring, Retaining
4
8
717-1358
Gear, Differential, 14T
2
9
717-1437
Gear, Differential, 10T
i 2
10
719-0333
Housing, Differential RH
1
11
719-0334
Housing, Differential LH
1
12
748-0383
Bearing, Flange, .75 ID x 1.0 OD
2
13
737-0300
Grease, Benalene
1 oz
14
721-0328
Sealant, Ultra Grey Loctite 5699
1
19