Partner Formula 400 CHROME Instruction Manual

GB

RU

INSTRUCTION MANUAL

IMPORTANT INFORMATION: Please read these instructions carefully
and make sure you understand them before using this unit. Ret ai n these
instructions for future reference.

Formula 400

CHROME

545123725 Rev. 2 1/31/07 BRW

30

98/37/EC

2006

Husqvarna Outdoor Products Italia S.p.A.

ViaComo72
Valmadrera,Lecco
ITALY I--23868

16
16

0,375

7T
7T0,375

Oregon 91VJ
Oregon 91VG

85° 30°

0°

91VJ

0,375 0,050/1,3

5/32

4,0

0,025/0,65

0,025/0,65

0°30°85°

5/32

4,0

0,050/1,30,375

91VG

ISO 11681--1:2004, EN ISO 12100-- 1:2003, EN ISO 12100--2:2003, CISPR 12.

22867

ISO 22868

16/41:56

16/41:56

34

IDENTIFICATION (WHAT IS WHAT?)

Chain

Adjustment Tool

(Bar Tool)

Primer Bulb

Fuel Mix Fill Cap

Starter
Housing

Bar Oil Fill Cap

Chain

Front Hand Guard

Front Handle

Starter Rope

ON/STOP
Switch

Muffler

Idle Speed Screw

Bumper
Spike

Guide Bar

Chain Brake Nuts

Cylinder Cover

Throttle
Lockout

Rear
Handle

Throttle
Trigger

Choke/
Fast Idle
Lever

Chain
Brake

Chain
Direction
of Travel

Adjusting
Screw

Chain
Catcher

Bar
Sprocket
Hole

IDENTIFICATION OF SYMBOLS

WARNING! This chain

saw can be dangerous! Care­less orimproper use cancause
serious or even fatal injury.

Read and understand the
instruction manual before
using the chain saw.

Always use two hands when operating the chain saw.

WARNING! Contactingthe guide bar tip with any object

should be avoided; tip contact may cause the guide bar to
movesuddenlyupwardand backward,whichmaycausese­rious injury.

Always wear appropriateear
protection, eye protection
and head protection.

Sound power level

35

IDENTIFICATION OF SYMBOLS

Move ON/STOP switch to
the ON position.

Slowly press primer bulb
6times.

Pull the starter rope
sharply 5 times with your
right hand.

Pull the starter rope sharply
with your right hand until
the engine starts.

Pull choke/fast idle lever
out to the full extent (to
the FULL CHOKE posi­tion).

Push the choke/fast idle
lever in to the HALF
CHOKE position.

Starting Reminder

SAFETY RULES

WARNING: Always disconnect

spark plug wire and place wire where it can­not contact spark plug to prevent accidental
starting when setting up, transporting, ad­justing or making repairs except carburetor
adjustments.
Because a chain saw is a high-speedwood­cutting tool, special safety precautions must
be observed to reduce the risk of accidents.
Careless or improper use of this tool can
cause serious injury.

PLAN AHEAD

S Read this manual carefully until you com-

pletely understand andcanfollowall safety
rules, precautions, and operating instruc­tions before attempting to use the unit.

S Restrict the use of your saw to adult users

who understand and can follow safety rules,
precautions, and operating instructions
found in this manual.

Snug
Fitting

Clothing

Safety
Shoes

Safety Chaps

Heavy Duty
Gloves

Eye
Protection

Hearing

Protection

Safety Hat

S Wear protective gear. Always usesteel-toed

safety footwear with non-slip soles; snug-fit­ting clothing; heavy-duty, non-slip gloves;
eye protection such as non-fogging, vented
goggles or face screen; an approved safety
hard hat; and sound barriers (ear plugs or

mufflers) to protect your hearing. Regular
users should have hearing checked regular­ly as chain saw noise can damage hearing.
Secure hair above shoulder length.

S Keep all parts of your body away from the

chain when the engine is running.

S Keep children, bystanders, and animals a

minimum of 10 Meters away from the work
area. Donot allow other people or animals to
be near the chain saw when starting or oper­ating the chain saw.

S Do not handle or operate a chain saw when

you are fatigued, ill, or upset, or if you have
taken alcohol, drugs, or medication. You
must be in good physicalcondition and men­tally alert. Chain saw work is strenuous. If
you have any condition that might be aggra­vated by strenuous work, check with your
doctor before operating a chain saw.

S Carefully planyoursawingoperationin ad-

vance. Donotstartcuttinguntilyou havea
clear work area, securefooting,and,ifyou
are felling trees, a planned retreat path.

OPERATE YOUR SAW SAFELY

S Donotoperateachainsaw with one hand.

Serious injury to the operator, helpers, by­standers or any combination of these per­sons may result from one-handed operation.
A chain saw is intendedfor two-handed use.

S Operate the chain saw only in a well-venti-

lated outdoor area.

S Donotoperate saw from aladder orin atree,

unless you are specifically trained to do so.

S Make sure the chain will not make contact

with any object while starting the engine.
Never try to start the saw when the guide bar
is in a cut.

S Do not put pressure on the saw at the endof

the cut. Applying pressure can cause you to
lose control when the cut is completed.

S Stop the engine before setting the saw

down.

36

S Do not operate a chain saw that is dam-

aged, improperly adjusted, or not com­pletely and securely assembled. Always
replace bar, chain, hand guard, or chain
brake immediately ifit becomes damaged,
broken or is otherwise removed.

S With the engine stopped, hand carry the

chain saw with the muffler away from your
body, and the guide bar and chain to the
rear, preferably covered with a scabbard.

MAINTAIN YOUR SAW IN GOOD
WORKING ORDER

S Have all chain saw service performed by a

qualified service dealer with the exception of
the items listed in the maintenance section of
this manual. For example, if improper tools
are used to remove or hold the flywheel
when servicing the clutch, structural damage
to the flywheel can occur and cause the fly­wheel to burst.

S Make certain the saw chain stops moving

when the throttle trigger is released. For
correction, refer to CARBURETOR AD­JUSTMENTS.

S Never modify your saw in any way. Use

only attachments supplied or specifically
recommended by the manufacturer.

S Keepthehandles dry,clean, andfree ofoil

or fuel mixture.

S Keep fuel and oil caps, screws, and fas-

teners securely tightened.

S Use only PartnerR accessories and re-

placement parts as recommended.

HANDLE FUEL WITH CAUTION

S Do not smoke while handling fuel or while

operating the saw.

S Eliminate all sources of sparks or flame in

the areas where fuel is mixed or poured.
Thereshouldbeno smoking, openflames,
orworkthatcouldcausesparks. Allowen­gine to cool before refueling.

S Mix and pour fuel in an outdoor area on bare

ground; store fuel in a cool, dry, well venti­lated place; and use an approved, marked
container for all fuel purposes. Wipe up all
fuel spills before starting saw.

S Moveat least 10 feet (3 meters) from fuel-

ing site before starting engine.

S Turn the engine off and let saw cool in a

non-combustible area, not on dry leaves,
straw, paper, etc. Slowly remove fuel cap
and refuel unit.

S Storetheunitandfuel inanarea where fuel

vapors cannot reach sparks or open
flamesfrom water heaters, electric motors
or switches, furnaces, etc.

KICKBACK

WARNING: Avoid kickback which

can result in serious injury. Kickback is the
backward, upwardorsuddenforwardmotion
of the guide bar occurring when the saw
chainneartheupper tip of theguidebar con­tacts any object such as a log or branch, or
when the wood closes in and pinches the
saw chain inthecut.Contactingaforeignob­ject in the wood can also result in loss of
chain saw control.

S Rotational Kickback canoccur whenthe

moving chain contacts an objectattheup­per tip of the guide bar. This contact can
cause the chain to dig into the object,
which stops the chain for an instant. The
result is a lightning fast, reverse reaction
which kicks the guide bar up and back to­ward the operator.

S Pinch-Kickback can occur when the the

wood closes in and pinches the moving
saw chain in the cut along the top of the
guide bar and the saw chain is suddenly
stopped. This sudden stopping of the
chain results in a reversal of the chain
force used to cut wood and causes the
sawtomove inthe opposite direction ofthe
chain rotation. The saw is driven straight
back toward the operator.

S Pull-In can occur when the moving chain

contacts a foreign object in the wood in the
cut along the bottom of the guide bar and the
saw chainis suddenly stopped. This sudden
stopping pulls the saw forward and away
from the operator and could easily cause the
operator to lose control of the saw.

Avoid Pinch--Kickback:

S Be extremely aware of situations or obstruc-

tions that can cause material to pinch the top
of or otherwise stop the chain.

S Do not cut more than one log at a time.
S Do not twist the saw as the bar is with-

drawn from an undercut when bucking.

Avoid Pull--In:

S Always begincutting with theengine atfull

speed and the saw housing against wood.

S Use wedges made of plastic or wood.

Never use metal to hold the cut open.

Kickback Path

Avoid obstructions

Clear the working area

REDUCETHECHANCEOF
KICKBACK

S Recognize that kickback can happen.

With a basic understanding of kickback,
you can reduce the element of surprise
which contributes to accidents.

S Never let themovingchaincontactanyob-

ject at the tip of the guide bar.

S Keep the working area free from obstruc-

tions such as other trees, branches, rocks,
fences, stumps, etc. Eliminate or avoid any
obstruction that your saw chain could hit
while you are cutting through a particular log
or branch.

37

S Keep your saw chain sharp and properly

tensioned. Alooseordullchain can increase
the chance of kickback occurring. Follow
manufacturer’s chain sharpening and main­tenance instructions. Check tension atregu­lar intervals with the engine stopped, never
with the engine running. Make sure the bar
clamp nuts are securely tightened after ten­sioning the chain.

S Beginandcontinue cutting at fullspeed. If

the chain is moving at a slower speed,
there is greater chance of kickback occur­ring.

S Cut one log at a time.
S Use extreme caution when re-entering a

previous cut.

S Do not attempt cuts starting with the tip of

the bar (plunge cuts).

S Watch for shifting logs or other forces that

could close a cut and pinch or fall into chain.

S Use the Reduced--Kickback Guide Bar

and Low--Kickback Chain specified for
your saw.

MAINTAIN CONTROL

Never reverse
hand positions

Stand to the left of
the saw

Thumb on underside of
handlebar

Elbow locked

S Keepagood, firm griponthesaw withboth

hands when the engine is running and
don’tletgo. A firmgripwillhelp you reduce
kickback and maintain control of the saw.
Keep the fingers of your left hand encir­cling and your left thumb under the front
handlebar. Keep your right hand com­pletely around the rear handle whether
your arerighthandedorleft handed. Keep
your left arm straight with the elbow
locked.

S Position your lefthandonthefronthandle-

bar so it is in a straight line with your right
hand on the rear handle when making
bucking cuts. Never reverse right andleft
hand positions for any type of cutting.

S Standwithyour weight evenly balanced on

both feet.

S Stand slightly to the left side of the saw to

keep your body from being in a direct line
with the cutting chain.

S Do not overreach. Y oucould be drawn or

thrown off balance and lose control of the
saw.

S Donotcutaboveshoulderheight. It isdiffi-

cult to maintain control of saw above
shoulder height.

KICKBACK SAFETY FEATURES

WARNING: The following features are

included onyour saw to help reduce thehazard
of kickback; however, such features will not to­tally eliminate this dangerous reaction. As a
chain saw user, do not rely only on safety de­vices. You must follow all safety precautions,
instructions, and maintenance in this manualto
help avoid kickback and other forces which
can result in serious injury.
S Reduced--Kickback Guide Bar, designed

withasmallradiustipwhichreducesthesize
ofthekickbackdanger zone onthebartip. A
Reduced--Kickback Guide Bar has been
demonstrated to significantly reduce the
number and seriousness of kickbacks.

Small Radius Tip

Reduced Kickback Symmetrical Guide Bar

Symmetrical Guide Bar

Large Radius Tip

S Low- -Kickback Chain, designed with a con-

toured depth gauge and guard link which de­flect kickback forceandallowwood togradu­ally ride into the cutter.

Low-Kickback Chain

Contoured Depth Gauge

Elongated Guard Link
Deflects Kickback
Force And Allows
Wood ToGradually
Ride Into Cutter

S Handguard, designed to reduce the chance

of your left hand contacting the chain if your
hand slips off the front handlebar.

S Position of front and rear handlebars, de-

signed with distance between handles and
“in-line” witheach other. The spread and “in­line” position of the hands provided by this
design work together to give balance and re­sistance in controlling the pivot of the saw
back toward the operator if kickback occurs.

WARNING: DO NOT REL Y UPON

ANY OF THE DEVICES BUILT INTO YOUR
SAW . YOU SHOULD USETHESAWPROP­ERLY AND CAREFULLY TO AVOID KICK­BACK. Reduced- -kickback guide bars and
low- -kickback saw chains reduce the chance

38

and magnitude of kickback and are recom­mended. Your saw has a low kickback chain
and bar as original equipment. Repairs on a
chain brake should be made by an authorized
servicing dealer. Take your unit to the place of
purchase if purchased from a servicing dealer,
or to the nearest authorized master service
dealer.
S Tipcontact in some casesmay cause alight-

ning fast reverse REACTION, kicking the
guide bar up and back toward the operator.

S Pinching the saw chain along the top of the

guide bar may push the guide bar rapidly
back toward the operator.

S Either of these reactions may cause you to

lose control of the saw which could result in
serious injury. Do not rely exclusively upon
the safety devices built into your saw.

CHAIN BRAKE

S Chainbrake,designedtostopthechainin

the eventof kickback.

WARNING: Your chain saw is

equipped with a chain brake that is designed to
stop the chain immediately if you get a kick-

back.The chainbrake reduce sthe riskofacci­dents, but only you can prevent them. DO NOT
ASSUME THAT THE CHAIN BRAKE WILL
PROTECTYOU IN THE EVENT OF A KICK­BACK.

SAFETY NOTICE: Exposure to vibrations

through prolonged use of gasoline powered
hand tools could cause blood vessel or nerve
damage in the fingers, hands, and joints of
people prone to circulation disorders or
abnormal swellings. Prolonged use in cold
weather has been linked to blood vessel
damage in otherwise healthy people. If
symptoms occur such as numbness, pain,
loss of strength, change in skin color or
texture, or loss of feeling in the fingers,
hands, or joints, discontinue the use of this
tool and seek medical attention. An
anti-vibrationsystemdoesnot guarantee the
avoidance of these problems. Users who
operate power tools on a continual and
regular basis must monitor closely their
physical condition and the condition of this
tool.

ASSEMBLY

Protective gloves (not provided) should be
worn during assembly.

ATTACHING THE BUMPER
SPIKE

The bumper spike may be used as a pivot
when making a cut.

1. Loosen and remove thechain brakenuts
and the chain brake from the saw.

2. Attach the bumper spike with the two
screws as illustrated.

ATTACHING THE BAR & CHAIN (If

not already attached)

WARNING: Recheck each assem-

blystep ifthesawisreceived assembled. Al­ways wear gloves when handling the chain.
The chain is sharp and can cut you even
when it is not moving!

1. Loosen and remove thechain brakenuts
and the chain brake from the saw.

2. Remove the plastic shipping spacer (if
present).

Chain
Brake

Chain Brake
Nuts

Clutch Drum

3. An adjusting pin and screw is used to ad­just the tension of the chain. It is very im­portant when assembling the bar, that the
pin located on the adjusting screw aligns
intoaholein thebar.Turningthe screw will
move the adjustment pin up and down the
screw. Locate this adjustment before you
begin mounting the bar onto the saw. See
illustration below.

Adjustment located on Chain Brake

Inside view of
Chain Brake

4. Turn the adjusting screw by hand coun­terclockwise until the adjusting pin just
touches the stop. This should allow the
pin to be near the correct position.

5. Slide guide bar behind clutch drum until
guide bar stops against clutch drum
sprocket.

39

Mount the Bar

6. Carefully remove the chain from the pack­age. Hold chain with the drive links as
shown.

CUTTERS MUST FACE IN

DIIRECTION OF ROTATION

Tip of
Bar

Cutters

Depth Gauge

Drive Links

Placechainontothesprocket

7. Place chain over and behind clutch, fitting
the drive links in the clutch drum sprocket.

8. Fit bottom of drive links between the
teeth in the sprocket in the nose of the
guide bar.

9. Fit chain drive links into bar groove.

10. Pullguide bar forward untilchain is snug
in guide bar groove. Ensure all drive
links are in the bar groove.

11. Now,install chain brake making sure the
adjusting pin is positioned in the lower
hole intheguidebar. Remember this pin
moves the bar forward and backward as
the screw is turned.

12. Installchainbrakenutsand finger tighten
only. Once the chain is tensioned, you
will need to tighten chain brake nuts.

CHAIN TENSION (Including units
with chain already installed)

NOTE

: When adjusting chain tension, make

sure the chain brake nuts are finger tight only.
Attempting to tension the chain when the chain
brake nuts are tight can cause damage.

Checking the tension:

Use the screwdriver end of the chain adjust­menttool(bartool)tomovethechainaround
the bar. If the chain does not rotate, it is too
tight.If too loose, thechain will sag belowthe
bar.

Chain Brake Nuts

Chain Adjustment

Tool (Bar Tool)

Adjusting the tension:

Chain tension is very important. Chain
stretches during use. This is especially true
during the first few times you use your saw.
Always check chain tension each time you
use and refuel your saw. Youcan adjust the
chain tension by loosening the chain brake
nuts and turning the adjusting screw 1/4 of a
turn while lifting up on the bar.
S Ifchainis tootight,turnadjusting screw1/4

turn counterclockwise.

S If chain is too loose, turn adjusting screw

1/4 turn clockwise.

Adjusting

Screw

Chain Brake Nuts

Guide Bar

Adjusting Screw -- 1/4 Turn

S Lift up the tip of the bar and securely tight-

en the chain brake nuts with the bar tool.

S Recheck chain tension.

Chain Brake
Nuts

WARNING: If the saw is operated

with a loose chain, the chain could jump off
the guide bar and result in serious injury.

WARNING: Mufflerisvery hotduring

and after use. Do not touch themuffleroral­low combustible material such as dry grass
or fuel to do so.

40

OPERATING YOUR UNIT

BEFORE STARTING ENGINE

WARNING: Be sure to read the fuel

informationinthe safety rules before yoube­gin.Ifyoudonot understand thesafetyrules,
do not attempt to fuel your unit. Contact an
authorized service dealer.

BAR AND CHAIN LUBRICATION

The bar and chain require continuous lubri­cation. Lubrication is provided by the auto­matic oiler system when the oil tank is kept
filled. Lack of oil will quickly ruin the bar and
chain. T oo little oil will cause overheating
shown by smoke coming from the chain and/
or discoloration of the bar.
Only use Bar and Chain Oil for bar andchain
lubrication.

Oil Cap

Fuel mix cap

FUELING ENGINE

WARNING: Remove fuel cap slowly

when refueling.
This engine is certified to operate on unleaded
gasoline. Before operation, gasoline must be
mixed with a good quality 2-cycle air-cooled
engine oil designed to be mixed at a ratio of
40:1. A 40:1 ratio is obtained by mixing 0,125
liter of oil with 5 liters of unleaded gasoline. DO
NOT USE automotive or boat oil. These oils
will cause engine damage. When mixing fuel
follow the instructions printed on the container.
Always read and follow the safety rules relating
to fuel before fueling your unit.

IMPORTANT

Experienceindicates that alcohol 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. T o avoid engine problems,
empty the fuel system before storage for 30
days or longer.Drain the gas tank, start the en­gine and let it run until the fuel lines and carbu­retor are empty. Use fresh fuel next season.
Never use engine or carburetor cleaner prod­ucts in the fuel tank or permanent damagemay
occur.

CHAIN BRAKE

Ensure chain brake is disengaged by pulling
the front hand guard back toward the front han­dle as far as possible. The chain brake must
be disengaged before cutting with the saw.

WARNING: The chain must not

move when the engine runs at idle speed. If
the chain moves at idle speed refer to CAR­BURETOR ADJUSTMENT within this

manual. Avoid contact with the muffler.Ahot
muffler can cause serious burns.
To stop the engine, move the ON/STOP
switch to the STOP position.
To start the engine, hold the saw firmly on
the ground as illustrated below. Make sure
the chain is free to turn without contacting
any object.

Hold saw firmly while pulling starter rope.

Use only 40 --- 45 cm o

f

rope per pull.

IMPORTANT POINTS TO REMEMBER

Whenpullingthestarter rope, do not use the full
extent of therope as this can cause the rope to
break. Do not let starter rope snap back. Hold
the handle and let the rope rewind slowly.
For cold weather starting, start the unit at full
choke; allow the engine to warm up before
squeezing the throttle trigger.

NOTE:Donotcut material with thechoke/fast

idle lever at the FULL CHOKE position.

STARTING A COLD ENGINE (or a
warm engine after running out of
fuel)

NOTE

:Inthefollowingsteps,whenthecho-

ke/fast idle lever is pulled out to the full ex­tent, the correct throttle setting for starting is
set automatically.

ON/STOP SWITCH

ON

STOP

(SIDE VIEW)

1. Move ON/STOP switch to the ON posi­tion.

2. Pull out choke/fast idle to the full extent
(to the FULL CHOKE position).

3. Slowly press primer bulb 6 times.

4. Pull the starter rope sharply 5 times with
your right hand. Then, proceed to the
next step.

NOTE: If the engine sounds as if it is trying

to start before the 5th pull, stop pulling and
immediately proceed to the next step.

5. Push the choke/fast idle lever in to the
HALF CHOKE position.

OFF HALF

CHOKE/FAST IDLE LEVER

Choke/
fast idle lever

(SIDE VIEW)

FULL

41

6. Pull the starter rope sharply with your
right hand until the engine starts.

7. Allow the engine torunforapproximately
30seconds. Then, squeeze andrelease
throttletriggerto allow engineto return to
idle speed.

STARTING A WARM ENGINE

1. Move ON/STOP switch to the ON posi­tion.

2. Pull the choke/fast idle lever out to the
HALF CHOKE position.

3. Slowly press the primer bulb 6 times.

4. Pull the starter rope sharply with your
right hand until the engine starts.

5. Squeeze and release throttle trigger to
allow engine to return to idle speed.

DIFFICULT STARTING (or starting a
flooded engine)

The engine may be flooded with too much
fuel if it has not started after 10 pulls.
Flooded engines can be cleared of excess
fuel by pushing the choke/fast idle lever in
completely (to the OFF CHOKE position)
and then following the warm engine starting
procedure listed above. Ensure the ON/
STOP switch is in the ON position.
Startingcould require pulling the starter rope
handle many times depending on how badly
the unit is flooded. If engine fails to start, re­fer to the TROUBLESHOOTING TABLE.

CHAIN BRAKE

WARNING: If the brakebandisworn

too thin it may break when the chain brakeis
triggered. With a broken brake band, the
chainbrake will notstopthechain.Thechain
brake should be replaced by an authorized
servicedealer if any partis worn to lessthan
0,02″ (0,5 mm) thick. Repairs on a chain
brake should be madeby an authorized ser­vicedealer.Takeyour unittothe place ofpur­chase if purchased from a servicing dealer,
or to the nearest authorized master service
dealer.
S This saw is equipped with a chain brake.

The brake is designed to stop the chain if
kickbackoccurs.

S The inertia activated chain brake is acti-

vated if the front hand guardis pushed for­ward, either manually or by centrifugal
force.

S Ifthebrakeisalready activated,itis disen-

gagedbypullingthe front hand guard back
toward the front handle as far as possible.

S Whencuttingwiththesaw,thechainbrake

must be disengaged.

Disengaged

Engaged

Braking function control

CAUTION:

The chain brake must be
checked several times daily. The engine
mustberunning when performing thisproce­dure. This istheonly instance when the saw
should be placed on the ground with the en­gine running.
Place the saw on firm ground. Grip the rear
handlewith your righthand andthefronthan­dle with your left hand. Apply full throttle by
fully depressing the throttle trigger. Activate
the chain brake by turning your left wrist
against the hand guard without releasing
your grip around the front handle. The chain
should stop immediately.

Inertia activating function control

WARNING: Whenperformingthe fol-

lowingprocedure, theenginemustbeturned
off.
Grip the rear handle with yourrighthandand
the front handle with your left hand. Hold the
chain saw approximately 14” (35 cm) above
a stump or other wooden surface. Release
your grip on the front handle and use the
weight of the saw to let the top of the guide
bar fall forward and contact the stump.
When the tip of the bar hits the stump, the
brake should activate.

CUTTING METHODS

IMPORTANT POINTS

S Check chain tension before first use and af-

ter 1 minute of operation. See CHAIN TEN­SION in the ASSEMBLY section.

S Cut wood only. Do not cut metal, plastics,

masonry, non-wood building materials, etc.

S Stop the saw if the chain strikes a foreign

object. Inspectthesawandrepair parts as
necessary.

S Keepthe chainoutof dirtandsand. Even a

smallamountofdirt will quickly dullachain
and increase the possibility of kickback.

S Practice cutting a few small logs using the

following techniques to get the “feel” of us­ing your saw before you begin a major
sawing operation.

S Squeeze the throttle trigger and allow the

engine to reach full speed before cutting.

S Begin cutting with the saw frame

against the log.

S Keep the engine at full speed the entire

time you are cutting.

S Allow thechainto cutforyou.Exertonly

light downward pressure.

S Release the throttle trigger as soon as

the cut is completed, allowing the en­gine to idle. If you run the saw at full
throttlewithoutacuttingload,unneces­sary wear can occur.

S To avoid losing control when cut is com-

plete, do not put pressure on saw at end
of cut.

S Stoptheenginebeforesetting the saw down.

42

TREE FELLING TECHNIQUES

WARNING: Donotcutnearbuildings

or electrical wires if you do not know the di­rection of tree fall, at night since you will not
be able to see well, or during bad weather
such as rain, snow, or strong winds.as fall is
unpredictable.
Carefully plan your sawing operation in ad­vance. You need a clear area all around the
tree so youcan have secure footing. Check
for broken or dead branches which can fall
on you causing serious injury.
Natural conditions that can cause a tree to
fall in a particular direction include:

S The wind direction and speed.
S The lean of the tree. The lean of a tree

might not be apparent due to uneven or
slopingterrain. Use aplumborlevel tode­termine the direction of tree lean.

S Weight and branches on one side.
S Surrounding trees and obstacles.

Look for decay and rot. If the trunk is rotted,
it can snap and fall toward the operator.
Make sure there is enough room for the tree to
fall. Maintain a distance of

2-1/2 tree lengths

from the nearest person or other objects. En­gine noise can drown out a warning call.
Remove dirt, stones, loose bark, nails, staples,
and wire from the tree where cuts are to be
made.

Direction of Fall

45_

Plan a clear retreat path

FELLING LARGE TREES

(15cmindiameterorlarger)

The notch method is used to fell large trees.
Anotchiscut onthesideofthe treeinthede­sired direction of fall. After a felling cut is
made on the opposite side of tree, the tree
will tend to fall into the notch.

NOTCH CUT AND FELLING THE
TREE

S Make notch cut by cutting the top of the

notch first. Cut through

1/3 of the diameter

ofthe tree. Nextcomplete thenotchbycut­ting the bottom of the notch. See illustra­tion. Once the notch is cut remove the
notch of wood from the tree.

Notch

First cut

Second cut

Final cut here. 5 cm above
center of notch.

5cm

5cm

S After removing the wood from the notch,

make the felling cut on the opposite side of
thenotch. This is done by making a cutabout
two inches higher than the center of the
notch. This will leave enough uncut wood
between the felling cut and the notch to form
a hinge. This hinge will help prevent the tree
from falling in the wrong direction.

Opening
of felling
cut

Closing of
notch

Hinge holds tree on stump and helps
control fall

NOTE: Before felling cut is complete, use

wedges to open the cut when necessary to
controlthedirectionoffall. Toavoidkickback
or chain damage, use wood or plastic
wedges, but never steel or iron wedges.
S Bealerttosignsthatthetreeisreadytofall:

cracking sounds, widening of the felling cut,
or movement in the upper branches.

S As tree starts to fall, stop saw,put it down,

and get away quickly on your planned re­treat path.

S DO NOT cut down a partially fallen tree with

your saw. Be extremely cautious with par­tially fallen trees that may be poorly sup­ported. When a tree doesn’t fall completely,
set the saw aside and pull down the treewith
a cable winch, block and tackle, or tractor.

CUTTING A FALLEN TREE

(BUCKING)

Bucking is the term used for cutting a fallen
tree to the desired log length.

WARNING: Do not stand on the log

being cut. Any portion can roll causing loss
of footing and control. Do not stand downhill
of the log being cut.

Important points

S Cut only one log at a time.
S Cut shattered wood very carefully; sharp

piecesofwood could beflungtowardoper­ator.

S Use a sawhorse to cut small logs. Never

allow another person to hold the log while
cuttingandneverholdthelog with yourleg
or foot.

43

S Do not cut in an area where logs, limbs,

and roots are tangled. Drag the logs into a
clear area before cutting by pulling out ex­posed and cleared logs first.

TYPES OF CUTTING USED FOR
BUCKING

WARNING: If saw becomes pinched

or hung in a log, don’t try to force it out. You
can lose control of the saw resulting ininjury
and/or damage to the saw. Stop the saw,
drive a wedge of plastic or wood into the cut
untilthesawcanberemovedeasily. Restart
thesawandcarefully reenter the cut. Do not
attemptto restart your saw whenitispinched
or hung in a log.

Turn s a w OFF and use a plastic or
wooden wedge to force cut open.

Overcutting begins onthetop side ofthelog
with the saw against the log. When overcut­ting use light downward pressure.

Overcutting

Undercutting

Undercuttinginvolvescutting on theunder­sideofthelog with top of saw against the log.
When undercutting use light upward pres­sure. Hold saw firmly and maintain control.
The saw will tend to push back toward you.

WARNING: Never turn saw upside

down to undercut. The saw cannot be con­trolled in this position.

Second cut

First cut on pressure side of log

First cut on pressure side of log

Second cut

BUCKING WITHOUT A
SUPPORT

S Overcut through 1/3 of the diameter of the

log.

S Roll the log over and finish with a second

overcut.

S Give special attention to logs under strain

to prevent the saw from pinching. Make
the first cut on the pressure side to relieve
the stress on the log.

BUCKING USING A LOG OR SUP­PORT STAND

S Remember your first cut is always on the

pressure side of the log.

S Your first cut should extend

1/3 of the

diameter of the log.

S Finish with your second cut.

1stCut

2

nd

Cut

Usingalogforsupport

2ndCut

1

st

Cut

1stCut

2

nd

Cut

Using a support stand

1stCut

2

nd

Cut

LIMBING AND PRUNING

WARNING: Be alert for and guard

against kickback. Do not allow the moving
chain to contact any other branched or objects
at the nose of the guide bar when limbing or
pruning. Allowing such contact can result in
serious injury.

WARNING: Neverclimbintoatreeto

limb or prune. Do not stand on ladders, plat­forms, a log, or in any position which cancause
you to lose your balance or control of the saw.

IMPORTANT POINTS

S Watch out for springpoles. Use extreme

caution when cutting small size limbs. Slen­der material may catch the saw chain andbe
whipped toward you or pull you off balance.

S Be alert for springback. W atch out for

branches that are bent or under pressure.
Avoid being struck by the branch or the
saw when the tension in the wood fibers is
released.

44

S Keep a clear work area. Frequently clear

branches out of the way to avoid tripping
over them.

LIMBING

S Always limba treeafteritis cut down. Only

then can limbing be done safely and prop­erly.

S Leave the larger limbs underneath the

felled tree to supportthe tree as you work.

S Start at baseofthe felled tree and work to-

ward the top, cutting branches and limbs.
Remove small limbs with one cut.

S Keep the tree between you and the chain

as much as possible.

S Remove larger, supporting branches with

thecuttingtechniquesdescribed inBUCK­ING WITHOUT A SUPPORT.

S Always use an overcut to cut small and

freely hanging limbs. Undercutting could
cause limbs to fall and pinch saw.

PRUNING

WARNING: Limit pruning to limbs

shoulder height or below. Do not cut if
branches are higher than your shoulder.Get
a professional to do the job.
S Make your fist cut

1/3 of the way through

the bottom of the limb.

S Nextmakea 2ndcutall the way through

the limb. Then cut a third overcut leaving

a1to2inchcollarfromthetrunkofthetree.

First cut

Second cut

Third cut

Collar

Pruning technique

SERVICE AND ADJUSTMENTS

WARNING: Disconnect the spark

plugbeforeperforming maintenance, except
for carburetor adjustments.
We recommend all service and adjustments
not listed in this manual be performed by an
Authorized Service Dealer.

MAINTENANCE SCHEDULE

Check:

Fuel mixture level Before each use....

Bar lubrication Before each use.......

Chain tension Before each use.......

Chain sharpness Before each use....

For damaged parts Before each use..

For loose caps Before each use......

For loose fasteners Before each use...

For loose parts Before each use......

Inspect and Clean:

Bar Before each use................

Complete saw After each use.......

Air filter Every 5 hours*.............

Chain brake Every 5 hours*........

Spark arresting screen

and muffler Every 25 hours*.........

Replace spark plug Yearly.
Replace fuel filter Yea r l y...

*HoursofOperation

AIR FILTER

CAUTION: Do not clean filter in gaso-

line or other flammable solvent to avoid
creating a fire hazard or producing harmful
evaporative emissions.

Cleaning the air filter:

A dirty air filter decreases engine perform­ance and increases fuel consumption and
harmful emissions.Always clean after every
5 hours of operation.

1. Clean thecover and the area around it to
keep dirt and sawdust from falling into
the carburetor chamber when the cover
is removed.

2. Remove the parts as illustrated below.

3. Wash the filter in soap andwater. Rinse
in clean cool water. Air dry completely
before reinstalling.

4. Add a few drops of oil to the filter;
squeeze filter to distribute oil.

5. Reinstall parts.

Air Filter

Cylinder
Cover
Screws

Cylinder
Cover

BAR MAINTENANCE

If your saw cuts to one side, hasto beforced
throughthecut,orbeenrunwithanimproper
amount of bar lubrication it may be neces­sary toservice yourbar. Awornbar will dam­age your chain and make cutting difficult.
After each use, ensure ON/STOP switch is
in the STOP position, then clean all sawdust
from the guide bar and sprocket hole.
To maintain guide bar:
S Move ON/STOP switch to the STOP posi-

tion.

S Loosen and remove chain brake nuts and

chain brake. Remove bar and chain from
saw.

S Clean the oil holes and bar groove after each

5 hours of operation.

Remove Sawdust From

Guide Bar Groove

Oil Holes

45

S Burring of guide bar rails is a normal

process of rail wear. Remove these burrs
with a flat file.

S Whenrailtopis uneven,useaflatfileto re-

store square edges and sides.

Correct GrooveWorn Groove

File Rail Edges

and Sides

Square

Replace guide bar when the groove is worn,
the guide bar is bent or cracked, or when
excess heating or burring of the rails occurs.
If replacement is necessary, use only the guide
barspecifiedforyour saw in the repair parts list
or on the decal located on the chain saw.

SPARK PLUG

The spark plug should be replaced each
year to ensure the engine starts easier and
runs better. Ignition timing is fixed and non­adjustable.

1. Loosen 3 screws on cylinder cover.

2. Remove the cylinder cover.

3. Pull off the spark plug boot.

4. Remove spark plug from cylinder and
discard.

5. Replace with Champion RCJ--7Y spark
plug and tighten securely with a 19 mm
socket wrench. Spark plug gap should
be 0,5 mm.

6. Reinstall the spark plug boot.

7. Reinstall the cylinder cover and 3
screws. Tighten securely.

Screws

Spark

Plug Boot

Spark

Plug

Cylinder

Cover

CHAIN SHARPENING

Chain sharpening is a complicated task that
requires special tools. We recommend that
you refer chain sharpening to a professional
chain sharpener.

CARBURETOR ADJUSTMENT

WARNING: The chain will be moving

during most of this procedure. Wear your pro­tective equipment and observe all safety pre­cautions. The chain must not move at idle
speed.

The carburetor has been carefully set at the
factory. Adjustments may be necessary if
you notice any of the following conditions:
S Chain moves at idle. See IDLE SPEED--T

adjusting procedure.

S Saw will not idle.See IDLE SPEED--T ad-

justing procedure.

Idle Speed-- T

Allow engine to idle. If the chain moves, idle
istoofast. Ifthe enginestalls, idleistooslow.
Adjust speed until engine runs without chain
movement (idle too fast) or stalling (idle too
slow). The idle speed screw is located inthe
area above the primer bulb and is labeled T.
S Turn idle speed screw (T) clockwise to in-

crease engine speed.

S Turn idle speed screw (T) counterclock-

wise to decrease engine speed.

STORAGE

WARNING: Stop engine and allow to

cool, and secure the unit before storing or
transporting in a vehicle. Store unit and fuel
in an area where fuel vapors cannot reach
sparks or open flames from water heaters,
electric motors or switches, furnaces, etc.
Storeunitwithallguards in place. Position so
that any sharp object cannot accidentally
cause injury to passersby. Store the unit out
of reach of children.
S Before storing, drain all fuel from the unit.

Start engine and allow to run until it stops.

S Clean the unit before storing. Pay particu-

lar attention to the air intake area, keeping
it free of debris. Use a mild detergent and
sponge to clean the plastic surfaces.

S Donot store theunitorfuel inaclosedarea

where fuel vapors can reach sparks or an
openflamefromhotwater heaters,electric
motors or switches, furnaces, etc.

S Store in a dry area out of the reach of chil-

dren.

CAUTION: It is important to prevent

gum deposits from forming in essential fuel
system parts such as the carburetor, fuel fil­ter,fuelhose, or fuel tank during storage. Al­cohol blended fuels (called gasohol or using
ethanol or methanol) can attract moisture
which leads to fuel mixture separation and
formationofacidsduringstorage. Acidicgas
can damage the engine.

46

TROUBLE CAUSE REMEDY

Engine will not
start or will run
only a few
seconds after
starting.

1. Ignition switch off.

2. Engine flooded.

3. Fuel tank empty.

4. Spark plug not firing.

5. Fuel not reaching
carburetor.

1. Move ignition switch to ON.

2. See “Difficult Starting” in
Operation Section.

3. Fill tank with correct fuel mixture.

4. Install new spark plug.

5. Check for dirty fuel filter; replace.
Check for kinked or split fuel line;
repair or replace.

Engine will
not idle
properly.

1. Idle speed requires
adjustment.

2. Carburetor requires

adjustment.

1. See “Carburetor Adjustment” in the
Service and Adjustments Section.

2. Contact an authorized service dealer.

1. Air filter dirty.

2. Spark plug fouled.

3. Chain brake engaged.

4. Carburetor requires
adjustment.

Engine will not
accelerate,
lacks power,
or dies under
a load.

1. Clean or replace air filter.

2. Clean or replace plug and regap.

3. Disengage chain brake.

4. Contact an authorized service dealer.

Engine
smokes
excessively.

1. Toomuch oil mixed with
gasoline.

1. Empty fuel tank and refill with
correct fuel mixture.

WARNING: Always stop unit and disconnect spark plug before performing all of

therecommendedremediesbelow except remedies thatrequire operation of the unit.

TROUBLESHOOTING TABLE

Chain moves
at idle speed.

1. Idle speed requires
adjustment.

2. Clutch requires repair.

1. See “Carburetor Adjustment” in the
Service and Adjustments Section.

2. Contact an authorized service dealer.

47

TECHNICAL DATA SHEET

Engine Formula 400 CHROME

Cylinder volume, cm

3

40
Stroke, mm 32
Idle speed, rpm 3,000
Recommended max.
speed, unloaded, rpm 13,000
Power, kW 1,7

Ignition system

Manufacturer Walbro
Type of ignition system CD
Spark plug Champion
Electrode gap, mm 0,5

Fuel and lubrication system

Manufacturer Walbro
Carburetor type WT--662
Fuel capacity, litre 0,38
Oil pump capacity at
8500 rpm, ml/min 4 -- 8
Oil capacity, litre 0,2
Type of oil pump Automatic

Weight

Without bar and chain, kg 4,7

BAR CHAIN

Length Pitch Max
Inches Inches Tip Radius

16 0,375 7T Oregon 91VJ
16 0,375 7T Oregon

91VG

Noise levels Formula 400 CHROME

Equivalent (see note 1) noise
pressure level at operator’s ear,
measured according to relevant
international standards, dB(A) 97
Equivalent (see note 1) noise
power level, measured
according to relevant
international standards, dB(A) 106

Vibration levels

(see note 2)
Front handle, m/s

2

5,5

Rear handle, m/s

2

8,5

Chain/bar

Standard bar length, in/cm 16/41
Recommended bar lengths,
in/cm 16/41
Usable cutting length, in/cm 15,5/40
Chain speed at maximum
power, m/sec 19
Pitch, inches 0,375
Thickness of drive link, mm 1,27
No. of teeth on drive sprocket 6

Note1: Equivalent noiselevel is, according to
ISO 22868, calculated as the time--weighted
energy total for noise levels under various
working conditions with the following time dis­tribution, 1/3 idle, 1/3 full load, 1/3 full speed.

Note2: Equivalent vibrationlevel is,according
toISO22867,calculated as the time--weighted
energy total for vibration levels under various
working conditions with the following time dis­tribution: 1/3 idle, 1/3 full load, 1/3 full speed.

0,375

85° 30°

0°

16/41:56

0,050/1,3 5/32 / 4,0 0,025/0,65

91VJ

in/cm :dl

91VG

0,375

0,050/1,3

5/32 / 4,0

85°

30°

0° 0,025/0,65 16/41:56

ADDRESS: Husqvarna Outdoor Products Italia S.p.A.

Via Como 72
Valmadrera, Lecco
ITALY I--23868

Husqvarna Outdoor Products Italia S.p.A.

Via Como 72

Valmadrera, Lecco

ITALY I--23868