Case 3550 User manual

Crawler Dozer
3550
Print No. 84415679
1st edition
English 02/11
from serial no: FNH03550NBHC05001
Operator’s Manual
3550
Crawler Dozer

The safety plates applied to this machine are colour coded yellow with black edges and wording for the
pointstowhichATTENTIONmustbepaidandredcolouredwithwhiteedgesandwordingforDANGERpoints.
Thisalertsymbolsignalsimportantmessagesinvolvingyoursafety.Itmeans:WARNING! BEALERT!IT
INVOLVES YOUR SAFETY.
Operator's Manual
Print No. 84415679 (II - 2011)
WARNING
STUDY THIS MANUAL BEFORE STARTING, OPERATING, MAINTAINING, FUELLING OR SERVICING
THEMACHINE.
Read and heed carefully all safety instructions identified by the key words WARNING and DANGER.
Crawler dozer
3550

WARNING
STUDYCAREFULLYTHISMANUALBEFORESTARTING,OPERATING,MAINTAINING,FUELLINGOR
SERVICINGTHEMACHINE.
IMPORTANTNOTICES
Thismachinehasbeendesignedandmanufacturedfordiggingandmovingloosematerialsonly.Any
otherapplicationshallbeconsideredcontrarytotheuseintendedbytheFactorywho,consequently,
shallnotbeconsideredresponsibleforanydamagetopropertyorthemachineitself,norforpersonal
injurieswhichcouldeventuallyoccur.Also,itmustbeconsideredthatbytakingtheriskforanimproper
use, you become responsible of the consequences.
Thismachinemustbeoperated,servicedorrepairedexclusivelybypersonnelpreviouslytrainedon
theequipmentatworkandtherelevantsafetyrules,besidesbeingauthorisedtooperatethemachine
itself.
The User is always obliged to observe the general rules for safety and the prevention of injuries, as
wellastherulesfor on-the-road travelling.
AnyarbitrarymodificationimplementedonthismachinemakesvoidanyresponsibilityoftheFactory
derivingfromdamages orinjuries.
Neither the Factory nor any Organisations in its Distribution Network, including but not limited to
national,regionalorlocaldistributors,areresponsibleforanyliabilityarisingfromanydamageresulting
fromdefectscausedbypartsand/orcomponentsnotapprovedbytheFactoryfor use in maintaining
and/orrepairingproductsmanufacturedormerchandisedbytheFactory.
Inanycase,nowarrantyofanykindismadeorshallbeimposedwithrespecttoproductsmanufactured
ormerchandisedbytheFactory,whenfailuresarecausedbytheuseofpartsand/orcomponentsnot
approved by the Factory.
SERIAL NUMBER
TYPE OF ENGINE
ENGINE SERIAL NUMBER

TABLE OF CONTENTS
SUBJECT PAGE
SAFETY RULES .........................................................................................................................................I-VII
Foreword ......................................................................................................................................................VIII
Identification data ............................................................................................................................................ 2
Quantitative sides of comfort........................................................................................................................... 3
GENERAL SPECIFICATIONS ........................................................................................................................ 4
Main dimensions ............................................................................................................................................. 7
Stability............................................................................................................................................................ 8
List and location of safety decals .................................................................................................................... 9
Preliminary instructions and break-in period.................................................................................................. 18
OPERATION RULES .................................................................................................................................... 19
Controls and instruments .............................................................................................................................. 21
OPERATING INSTRUCTIONS..................................................................................................................... 34
General information....................................................................................................................................... 34
Prior to starting (daily) ................................................................................................................................... 34
Engine starting .............................................................................................................................................. 34
Stopping the machine.................................................................................................................................... 36
Stopping the engine ...................................................................................................................................... 37
Operator's seat adjustment ........................................................................................................................... 37
Fuel reservoir ................................................................................................................................................ 38
Blade adjustment........................................................................................................................................... 38
Removal of cab ............................................................................................................................................. 39
Reinstallation of cab ...................................................................................................................................... 40
Brakes disengagement.................................................................................................................................. 41
Towing the mechine ...................................................................................................................................... 43
Moving the machine with outside means....................................................................................................... 44
Instructions for lowering the equipment to the ground with engine inoperative ............................................. 45
Transporting the machine.............................................................................................................................. 45
Long storage of the machine......................................................................................................................... 46
Cold climate precautions ............................................................................................................................... 46
Starting the machine at low temperatures ..................................................................................................... 47
Starting the machine with booster batteries .................................................................................................. 47
MACHINE OPERATION ............................................................................................................................... 48
CAB............................................................................................................................................................... 57
MAINTENANCE ............................................................................................................................................ 61
Maintenance operations ................................................................................................................................ 62
Walk around inspection (to be performed daily) ............................................................................................ 62
List of on-board tools..................................................................................................................................... 63
List of programmed maintenance .................................................................................................................. 64
Every 10 hors work ....................................................................................................................................... 65
Every 50 hours work...................................................................................................................................... 66
Every 250 hours work.................................................................................................................................... 68
Every 500 hours work.................................................................................................................................... 71
Every 1000 hours work.................................................................................................................................. 73
Every 2000 hours work.................................................................................................................................. 79
When Required ............................................................................................................................................. 80
Operations to be performed, when required.................................................................................................. 81
ELECTRICAL SYSTEM ................................................................................................................................ 82
Electrical diagram of protection tree .............................................................................................................. 83
TABLE OF FLUID CAPACITIES................................................................................................................... 84

I
SAFETY RULES
GENERALITIES
Study carefully this Manual before starting, operating,
maintaining, fuelling or servicing the machine.
Read and heed all safety rules before any intervention.
Do not allow unauthorised personnel to operate service or
maintain this machine.
Do not operate the machine if not feeling in good health
conditions.
Do not wear rings, wrist watches, jewellery, loose or
hanging apparels, such as ties, torn clothing, scarves,
unbuttoned or unzipped jackets that can catch on moving
parts.Wearpropersafety equipment as recommendedfor
the job. Examples: hard hat, heavy gloves, ear protection,
safety glasses or goggles, reflector vests, respirator.
Consult your employer for specific safety equipment
requirements.
Keep operator's compartment, stepping points, grab-rails
and handles clear of foreign objects, oil, grease, mud or
snow accumulation to minimise the danger of slipping or
stumbling. Clean mud or grease from shoes before
attempting to mount or operate the machine.
Do not jump on or off the machine. Keep two hands and
onefoot,ortwofeetand onehandin contactwithstepgrab
rails and handles at all times.
Do not use controls or hoses as hand holds when climbing
onoroff machine.Hosesand controlsaremovable anddo
not provide a solid support. Also, controls may be
inadvertently moved causing accidental machine or
equipment movement.
Never attempt to operate the machine or its tools from any
position other than seated in the operator's seat.
Keep head, body, limbs, hands and feet inside operator's
compartment at all times, to reduce exposure to hazards
outside the operator's compartment.
Be careful of slippery conditions on stepping points, hand
rails, and on the ground. Wear safety boots or shoes that
have a high slip resistant sole material.
Do not leave the machine until it is completely stopped.
Checktheseatsafety belt at least twiceayear.If there are
signs of wear or fraying or other signs of weakness that
could lead to failure, replace it.
STARTING
NEVER START NOR OPERATE AN UNSAFE
MACHINE. Before operating a machine, always ensure
that any unsafe condition has been satisfactorily
remedied.
Check brakes, steering and attachment controls before
moving. Advise the proper maintenance authority of any
malfunctioning part or system.
Besureall protectiveguardsor panels areinplace, andall
safetydevicesprovided are inplaceand in goodoperating
conditions.
Be sure exposed personnel in the area of operation are
clear of the machine before moving it or its attachments.
WALK COMPLETELY AROUND the machine before
mounting. Sound horn.
Before starting machine, check, adjust and lock the
operator's seat for maximum comfort and control of the
machine.
Fasten your seat belt (when provided).
Obey all flag signals and signs.
Due to the presence on the machine of flammable fluids,
never check or fill fuel reservoirs or batteries near open
flames, smoking materials or sparks.
REMEMBER THAT STARTING FLUID IS FLAMMABLE.
Follow strictly the recommendations printed on containers
and in the Operation and Maintenance Manual.
DO NOT PUNCTURE OR BURN CONTAINERS.
Containers must be stored in fresh, well ventilated places,
out of reach of unauthorised persons. Follow strictly the
instructions provided by the Manufacturer.
Never use these products near open flames, smoking
materials or sparks
OPERATION
Do not run the engine of this machine in closed areas
without proper ventilation to remove deadly exhaust
gases.
Roll Over Protective Structures are required on loaders,
dozers, graders, excavators. NEVER OPERATE
machines without ROPS.
Make sure the Operator's compartment is free of foreign
objects, especially if not firmly secured. Never use the
machine to transport objects, unless proper securing
points are provided.
Check monitoring instruments at start-up and frequently
during operations. in case the brake pressure gauge
shows a pressure lower than the minimum operating
pressure, stop immediately the machine.
DO NOT CARRY RIDERS ON MACHINE.
Study and familiarise with escape routes alternate to
normal exit routes.
Seat belts are required by current regulations to be
provided with Roll Over Protection Structures or cabs.
Keep safety belts fastened around you during operation.
For your personal protection, do not climb on or off
machine while machine is in motion.
Make sure that exposed persons in the area of operation
are clear of the machine, before starting the engine and
operatingtheequipment. Soundhorn.Obey allindications
provided by flags and signals.
NEVERCOASTthemachinedowngradesandslopeswith
the transmission in neutral or neutralised.

II
SAFETY RULES
Choose and shift into the most appropriate gear to keep
the speed required, thus preventing any loss of control.
Donot operatemachinery ina conditionofextremefatigue
orillness. Beespeciallycareful towardstheend ofworking
shift.
Do not operate machine with brakes out of adjustment.
Operate the machine at speeds slow enough to ensure
complete control at all times.
Travel slowly over rough terrain, on slopes or near drop-
offs, in congested areas or on ice or slippery surfaces.
When backing, always look to where the machine is to be
moved. Be alert to the position of exposed personnel. DO
NOTOPERATE ifexposed personnelenter theimmediate
work area. STOP THE MACHINE.
Maintain a safe distance from other machines. Provide
sufficient clearance for ground and visibility conditions.
Yield right-of-way to loaded machines.
Maintain clear vision of areas of travel or work. Keep cab
windows clean and repaired.
When machines are operating in tandem, the pusher
(rear) must be equipped with the appropriate deflectors to
protectthe unitinfront fromthe airstreamcoming fromthe
radiator.
When pulling or towing through a cable or chain, do not
start suddenly at full throttle; take-up slack carefully.
Inspect carefully for flaws or troubles before using.
Avoid kinking chains or cables. Do not pull through a
kinked chain or cable to the high stresses and possibility
of failure of the kinked area. Always wear heavy gloves
when handling chains or cables.
Be sure chains and cables are anchored and the anchor
points are strong enough to handle the expected load.
Keepexposedpersonnelclearofanchorpointsandcables
or chains.
DONOTPULLUNLESSOPERATOR's COMPARTMENT
OFMACHINES INVOLVEDARE PROPERLYGUARDED
AGAINST POTENTIAL CABLE OR CHAIN BACKLASH.
Be alert to soft ground conditions close to newly
constructed walls. The fill material and weight of the
machine may cause the wall collapse under the machine.
In darkness, check area of operation carefully before
moving in with machine. Use all lights provided. Do not
move into area of restricted visibility.
If engine has a tendency to stall for any reason under load
or idle, report this for adjustment to proper maintenance
authority immediately. Do not continue to operate
machine, until condition has been corrected.
On machines supplied with suction radiator fans, be sure
to periodically check engine exhaust parts for leaks, as
exhaust fumes are dangerous to the operator.
In case of closed type cabs, always keep an opening with
the outside, to ensure a constant air circulation.
Operators must know thoroughly the performances of the
machine they are operating. When working on slopes or
near sudden level drops of the terrain, avoid areas where
ground is loose or soft since rolling-over or loss of control
of machine could result.
Where noise exposure exceeds 90 dBA for 8 hours, wear
approved ear protection.
When counterweights are provided, do not work machine
if they have been removed.
Overtaking manoeuvres must be performed only when
absolutely necessary and unavoidable. Beware of
possible uneven terrains, poor visibility conditions, the
presence of other machinery or persons out of sight.
Operate the machine at a speed adequate to the working
conditions in the site and slow enough to ensure complete
control at all times.
Never use the machine as a work platform or scaffolding,
nor other inappropriate operations (i.e. pushing railway
cars, trucks or other machines).
Be alert of people in the operating area of the machine.
When operating a machine, know in advance what
clearances will be encountered, overhead doors, cables,
pipes, bearing load limitations of ground, bridges, floors or
ramps.
When roading, find-out what conditions are likely to be
encountered, clearances, traffic congestion, type of road
surfacing, etc. Beware of fog, smoke or dust elements that
obscure visibility.
When crossing gullies or ditches, move at an angle with
reduced speed after ensuring ground conditions will
permit a safe traverse.
Exploretheworkingareatoidentifypotentialriskssuchas:
slopes, overhangs, pits, demolition rubble, fires, ravines,
ditches, soft terrain, heavy traffic, crowded parking areas,
closed ambients. In such conditions, proceed with
extreme care.
Whenever possible, avoid going over obstacles such as
rough terrain, rocks, logs highly irregular ground, steps,
ditches, railroad tracks. When obstructions must be
crossed, do so with extreme care at an angle, if possible.
Reduce speed, shift-down. Ease up to the break over
point,pass thebalancepoint slowlyonthe obstructionand
ease down on the other side.
In steep down-hill operation, do not allow engine to over-
speed. Select proper gear before starting down grade.
Avoid side hill travel, whenever possible. Drive up and
down the slope. Should the machine slipping sideways,
turn it immediately downhill.
The grade of slope you should attempt will be limited by
factors such as condition of the ground, load being han-
dled, type of machine, speed of machine and visibility.
There is no substitute for good judgement when working
on slopes.

III
SAFETY RULES
Avoid operating equipment too close to an overhang or
high wall, either above or below the machine. Be on the
look-out for caving edges, falling objects and slides.
Beware of concealment by brush and undergrowth of
these danger.
When pushing-over trees, the machine must be equipped
with proper overhead guarding. Never allow a machine to
climb up on the root structure particularly while the tree is
beingfelled.Useextremecarewhenpushingoveranytree
with dead branches.
When pushing trees with dead limbs, proceed with ex-
treme care. Avoid brush piles, logs or rocks.
NEVER DRIVE OVER THEM or other surface irregulari-
tiesthat braketraction withthe ground,especially whenon
slopes or near drop-offs.
Be alert to avoid changes in traction conditions that could
cause loss of control. DO NOT DRIVE on ice or frozen
ground conditions when working the machine on steep
slopes or near drop-offs.
Workinginvirginandroughterrainsischaracterisedbythe
presence of all the perils and risks listed above. In these
conditions, it is emphasised the danger represented by
large tree limbs (possibly falling on the machine), large
roots (acting as a leverage under the machine when up-
rooted causing the roll-over of the unit) etc...
STOPPING
When the machine is stopped for whatever reason, follow
the instructions of chapters "Stopping the machine" and
"Stopping the engine" of the Operation and Maintenance
Instruction Manual.
Always remember to position the transmission drive
controlin neutralandengagethecontrollockto securethe
machine.
The parking brake is automatically set.
NEVER LEAVE THE MACHINE UNATTENDED with the
engine running.
Always, before leaving the operator's seat and after
making sure all people are clear of the machine, slowly
lower the attachments or tools flat to the ground in a
positive ground support position.
Return the controls to rest position. Place the gearshift
lever in neutral. Disconnect the master switch and extract
the key.
See the relevant chapter in this Manual.
Park in a non- operating and no-traffic area or as
instructed.Parkon firmlevel groundifpossible. Wherenot
possible, position machine at a right angle to the slope,
making sure there is no danger of uncontrolled sliding
movements.
If parking in traffic lanes cannot be avoided, provide
appropriate flags, barriers, flares and signals as required.
Also provide advance warning signals in the traffic lane of
approaching traffic.
Keep head, body, limbs, feet, fingers or hands away from
bucket, blade or ripper when in raised position.
Always disconnect the master switch before any
intervention (i.e. cleaning, repairing, maintaining,
refuelling etc.). Do the same when parking for prolonged
periods of time to avoid accidental or unauthorised
starting.
Never lower attachments or tools other than seated in
operator's seat. Sound horn. Make sure area near the
attachment is clear. Lower the attachment slowly. DO
NOT USE FLOAT POSITION of hydraulic system.
Place master switch in OFF, securely block the machine
andlockit every time youleaveitunattended. Return keys
to authorised security. Heed all shut-down operations of
the Operation and Maintenance Instruction Manual are
followed.
MAINTENANCE
GENERALITIES
Before operating or performing any intervention on the
machine:
- read carefully all the rules contained by this Manual,
- read and obey all safety related plates and instructions
located on the machine.
Do not allow unauthorised personnel to perform any
maintenance operation. Do not perform maintenance
operation without prior authorisation. Follow all
recommended maintenance and service procedures.
Keep operator's compartment free of all loose objects that
are not properly secured.
Do not wear rings, wrist watches, jewellery, loose or
hanging apparels, such as ties, torn clothing, scarves,
unbuttoned or unzipped jackets that can catch on moving
parts.Wearpropersafety equipment as recommended for
the job. Examples: hard hat, heavy gloves, ear protection,
safety glasses or goggles, reflector vests, respirator.
Consult your employer for specific safety equipment
requirements.
Do not use controls or hoses as hand holds when climbing
onoroff machine.Hosesand controlsaremovable anddo
not provide a solid support. Also, controls may be
inadvertently moved causing accidental machine or
equipment movement.
Do not jump on or off the machine. Keep two hands and
onefoot,ortwofeetandonehandincontactwithstepgrab
rails and handles at all times.
Do not perform any service operation on the machine with
a person seated in the operator's compartment, unless he
is an authorised operator co-operating in the operation to
be performed.

IV
SAFETY RULES
Keep operator's compartment, stepping points, grab-rails
and handles clear of foreign objects, oil, grease, mud or
snow accumulation to minimise the danger of slipping or
stumbling. Clean mud or grease from shoes before
attempting to mount or operate the machine.
Keep shoes free of mud or grease before climbing or
driving the machine.
Never attempt to operate the machine or its tools from any
position other than seated in the operator's seat.
When maintenance operations require moving
hydraulically operated attachments by means of
machine's hydraulic system remember that all
manoeuvres must be made only when seated in the
operator's seat. Before starting machine or moving
attachmentor tools,setbrakes ,sound hornandcall foran
all clear. Raise attachment slowly.
Always block booms or parts of the machine which must
be raised to perform interventions under them with
external devices. Do not allow persons to move into the
vicinitiesnorstanding underequipmentnot beingblocked.
Unlessyouaretotallysureaboutyoursafety,avoidstaying
under raised equipment, even in case it is blocked.
Do not place the body, limbs or fingers into sharp
articulation uncontrolled openings of the machine and
without proper protections, unless they are blocked in a
safe manner.
Never perform interventions with engine running, except
as called for in a Manual. Do not wear loose clothing or
jewellery near moving parts.
When servicing or maintenance require access to areas
that cannot be reached from the ground, use a ladder or
step platform that meet local and national regulations, to
reach the service point. If such ladder or platform are not
available, use the machine hand holds and steps as
provided. Perform all service or maintenance carefully.
Shop and/or field service platforms or ladders must be
constructed and maintained in accordance with local and
national regulations.
Disconnect batteries and tag all controls according to
current regulations to warn that work is in progress. Block
machine and all attachments that must be raised
according to current regulations.
Duetothe presenceofflammable fluids,nevercheck orfill
fuel tanks, batteries, nor use starting fluid near lighted
smoking materials or open flames.
BRAKES ARE INOPERATIVE when manually released
for servicing. Provisions must be made to maintain control
of the machine by blocking or other means.
The fuel filling nose must be kept constantly inside the
fillingneck.Keepthiscontactfromthebeginningtotheend
of the fuelling operation to avoid the possibility that sparks
due to static electricity are generated.
Use only designated towing or attaching points. Use care
in making attachments. Make sure pins and/or locks are
secure before pulling. Stay clear of drawbars, cables or
chains under load.
To move a disabled machine, use a trailer or a low-boy, if
available. In case towing is needed , use all necessary
signals required by local and national regulations, and
follow the directions provided in this Manual.
Toload/unload amachinefromtransporter,choose alevel
surface ensuring firm support to the wheels of truck or
trailer. Use strong access ramps, with adequate height
and angle. Keep surface free of mud, oil or slippery
materials.
Anchor the machine securely to the bed of truck or trailer
and block wheels or tracks with appropriate wedges.
Never align holes with fingers or hands; always use
appropriate aligning tools.
Eliminate all sharp edges and burrs from re-worked parts.
Use only approved grounded auxiliary power sources for
heaters, chargers, pumps and similar equipment to
reduce the hazards of electrical shocks.
Lift and handle heavy parts with a lifting device of proper
capacity.Besure partsare supportedbyproper slingsand
hooks. Use lifting eyes if provided. Watch-out for people in
the vicinity.
Never pour gasoline or diesel fuel into open, wide and low
containers. Never use gasoline, solvent or other
flammable fluid to clean parts. Use exclusively qualified,
non-flammable, non-toxic commercial solvents.
When using compressed air for cleaning parts, use safety
glasses with side shields or goggles. Limit pressure to 2
bar, in accordance with local and national regulations.
Do not run the engine in closed areas without proper
ventilation to remove deadly exhaust fumes.
Do not smoke or permit any open flames or spark near
when re-fuelling or handling flammable materials.
Donot usean openflame asa lightsourcetolookforleaks
or for inspection anywhere on the machine.
Makesurethat allmechanic'stools are ingoodconditions.
NEVER USE tools with mushroomed heads or frayed.
Always wear eye protections.
Movewith extremecarewhenworkingunder themachine,
its attachments and or on or near them. Always wear
protective safety equipment as required, such as hard hat,
goggles, safety shoes, ear plugs.
When performing operations requiring running of the
engine, have a qualified operator in the operator's seat at
all times with the mechanic on sight. Place the
transmission in neutral and set the brakes and safety lock.
KEEP HANDS AND CLOTHING AWAY FROM MOVING
PARTS.
For field service, move machine to level ground, if
possible, and block it. If work on an incline is absolutely
necessary, first block machine and its attachments
securely,thanmove it to levelgroundassoon as possible.
Do not trust worn and /or kinked chains and cables: do not
use them for lifting or pulling operations. To handle them,
always use heavy gloves.

V
SAFETY RULES
Be sure chains and cables are anchored and the anchor
points are strong enough to handle the expected load.
Keepexposedpersonnelclearofanchorpointsandcables
or chains.
Nobystandersareallowednearthehookingpoints,chains
or cables.
DO NOT PULL UNLESS OPERATOR'S COMPART-
MENT OF MACHINES INVOLVED ARE PROPERLY
GUARDED AGAINST POTENTIAL CABLE OR CHAIN
BACKLASH.
Keep the area where maintenance operations are
performed CLEAN and DRY. Eliminate immediately all
water and oil spillages.
Donotpileoilyorgreasyrags;theyrepresentafirehazard.
Store in closed metal container.
Before starting machine, check, adjust and lock the
operator's seat for maximum comfort and control of the
machine. Be sure exposed personnel in the area of
operation are clear of the machine before moving it or its
attachments. Sound horn.
Rust inhibitors are volatile and flammable Use only in well
ventilated areas. Keep open flames away - DO NOT
SMOKE - Store containers in a cool well ventilated place,
secure against unauthorised personnel.
Do not carry loose objects in pockets that might fall
unnoticed into open compartments.
Wear proper protective equipment such as safety goggles
or safety glasses with side shields, hard hat, safety shoes,
heavy gloves when metal or other particles are apt to fly or
fall.
Wear welders protective equipment such as dark safety
glasses, helmets, protective clothing, gloves and safety
shoes,when weldingorburning.Weardark safetyglasses
near welding zones. DO NOT LOOK AT ARC WITHOUT
PROPER EYE PROTECTION.
Know your jacking equipment and its capacity. Be sure
the jacking point used on the machine is appropriate for
the load to be applied. Be sure the support of the jack
at the machine and under jack is appropriate and
stable.
The load lifted by jacks is always dangerous: it is
necessary to transfer loads to appropriate blocking as a
safety measure, before proceeding with service or
maintenance work, according to local or national
regulations.
Steel cables are frayed after prolonged use; always wear
appropriate protections (heavy gloves, goggles etc.).
Handle all parts carefully. Keep hands and fingers away
from structures, gears or moving parts. Use and wear
always the appropriate protections
Compressed air systems can have water deposits
created by moisture condensation due to changes of
atmospheric conditions. If required, discharge
deposits, as instructed.
STARTING
Do not run the engine in closed areas without proper
ventilation to remove deadly exhaust fumes.
Do not place head, body, limbs, feet, hands or fingers,
near rotating fans or belts. Be especially alert near pusher
fans.
STARTING FLUID IS HIGHLY FLAMMABLE. Follow
strictly the recommendations printed on containers and in
the Operation and Maintenance Manual. Containers must
be stored in fresh, well ventilated places, out of reach of
unauthorised persons. DO NOT PUNCTURE OR BURN
CONTAINERS.
ENGINE
Loosen the radiator cap very slowly, to release pressure
from the system, before removing it. All coolant level top-
ups must be performed with engine OFF.
Avoid that flammable materials touch exhaust parts.
Should this be possible, provide the necessary
protections.
Do not run engine when refuelling and use care if the
engine is hot due to the increased possibility of a fire if fuel
is spilled.
Never attempt to check or adjust fan belts when engine is
running.
Do not adjust engine fuel pump when machine is
moving.
Do not lubricate the machine with engine running.
Do not run the engine with air intakes, door or protections
open.
ELECTRICAL SYSTEM
Always disconnect batteries prior to any intervention on
machine or electrical system (cleaning, repair,
maintenance).
Should booster batteries be used, remember to connect
both ends of the booster cables in the proper manner (+)
with (+) and (-) with (-). Avoid short-circuits of the
terminals. Follow thoroughly the instructions of this
Manual.

VI
SAFETY RULES
Before any intervention, make sure that the main switch is
OFF.
BATTERY GAS IS HIGHLY FLAMMABLE. Leave battery
box open to improve ventilation when recharging
batteries. Never check charge by placing metal objects
across the posts. Keep sparks or open flames away from
batteries. Do not smoke near battery to guard against the
possibility of causing an explosion.
Before any intervention, make sure that there are no fuel
or electrolyte leakages; eliminate them before proceeding
with further work. When recharging batteries in closed
ambients, make sure that there is appropriate ventilation
to prevent possible accidental explosions due to the
accumulation of gases generated during the recharge.
HYDRAULIC SYSTEM
Fluid escaping under pressure from a very small hole can
be almost invisible and can have sufficient force to
penetrate the skin. Use a piece of cardboard or wood to
search for suspected pressure leaks. DO NOT USE
HANDS. If injured by escaping fluid, see a doctor at once.
Serious infection or reaction can develop if proper medical
treatment is not administered immediately.
Stop the engine and release all pressures in the system
before removing panels, housings, plugs or covers.
In case pressures must be measured, use instruments of
adequate capacity. Always follow the recommended
procedures.
EQUIPMENT
Keep head, body, limbs, feet, fingers or hands away from
bucket, blade or ripper when in raised position.
Prior to any intervention, install all safety devices
according to current rules and regulations.
In case equipment on the machine must be operated by
hydraulic systems, remember to proceed only after
seating in the operator's compartment. Make sure that
there are no persons in the operating area of the machine.
Alert people before operating using the horn and by voice.
Move the equipment very carefully.
Do not use machine to transport loose objects, unless
proper devices for this purpose are provided.
Clutches and brakes of this machine and eventual
auxiliary equipment and attachments (such as operating
cylinder or winches control valves) must always be
properly adjusted in accordance with the instructions
provided by the Manuals of the Manufacturer.
Never perform adjustments with engine running, except
when called for by the above instructions.
When changing work shift, check that wheel or rim
securingscrewsandbracketsarenotloosen;ifnecessary,
retighten to the prescribed torque.

VII
On machines having hydraulically, mechanically, and/or cable controlled equipment (such as shovels,
loaders, dozers, excavators etc.) be certain the equipment is lowered to the ground before servicing,
adjusting and/or repairing. If it is necessary to have the hydraulically, mechanically, and/or cable controlled
equipment partially or fully raised to gain access to certain items, be sure the equipment is suitably
supported by means other than the hydraulic lift cylinders, cable and/or mechanical devices used for
controlling the equipment.
WARNING
SAFETY RULES
Forthedecommissioningofthemachine,theavailability
of particular tooling (hoists, hydraulic presses.
containers for liquids etc.) is required as well as
specific tools listed in the Repair Manuals, available
fromlicensedDealers.
This has the purpose of avoiding that during
disassembly operations, dangerous situations may
arise both for the personnel involved and the
environment.
In the machine are present:
• Fluids under pressure (hydraulic system, cooling
system etc.)
• Gases(airconditioningsystemandaccumulator,if
installed)
• Mechanicaldevicesmountedunderpressure(track
tensioner etc.)
• Acid (battery)
• Heavy machine components (frames, blades,
buckets etc.)
DECOMMISSIONING THE MACHINE
•The decommissioning of the machine must be
performed exclusively by personnel trained,
qualified and authorised to perform such
operation.
•Start the disassembly of hydraulic components
only after the same, the hydraulic oil and lubricants
have fully cooled-off and after all residual
pressures have been released, as described by
the Repair Instruction Manual.
•Prior to proceeding with disassembly operations,
comply with theGENERAL SAFETY RULES
and drain each components of the machine filled
with fluids, both in the reservoirs and the relevant
systems.
WARNING
DISPOSE OF WASTES
IN AN APPROPRIATE MANNER
• Theimproperdisposalofwasteisamenaceforthe
environment. Potentially dangerous wastes used
on machines include lubricants, fuel, filters and
batteries.
- Use sealed containers when draining fluids; do
not use containers for food or drinks which could
be erroneously used for drinking.
- Donotspreadwasteontheground,indrainages
or water tables.
- Seekinformationabouttheappropriatemanners
of re-cycling or disposing of waste from local
authorities or waste management centres, or
from your Dealer.

VIII
Thismanual is designedto serveasa guidancefor correct andsafe operation ofthe machine andits systematic
servicing.
The continued observance of the instructions provided herein will ensure best possible performance, operation
economyandlonglifeofthemachineandwillavoidthemostcommoncausesofaccidentswhichmayoccurduring
workormaintenanceoperations.
As regards safety in particular, read carefully the general rules given on pages I through VII.
The repair procedures for this machine are described in separate service publications obtainable from the
Manufacturer'sOrganization.
Eachmachine is suppliedwith acopyof thismanual. The descriptionsand illustrations appearingin this manual
are not binding; thus the Manufacturer reserves the right, while retaining the basic features of the model herein
described and illustrated, to make at any time, and without necessarily bringing this manual up-to-date, any
alterationtounits,parts,accessoriesortheirsupply,deemedexpedientforimprovementorforanymanufacturing
orcommercialreason.For any clarification,refertoyourDealer who will provide anyinformationyoumay need.
FOREWORD
TheinformationprovidedbythisManualisvalidatthetimeofpublication.SincetheManufacturerisconstantly
improving its products, some information could result not up-to date. In the event discrepancies are
experienced,consult theSales and ServiceOrganization.

1
Carefully read personal and machine SAFETY PRECAUTIONS (at the beginning of this manual)
3550
The safety of the operator and bystanders depends upon its judgement capacity and prudence in
operating the machine. Thus it is necessary to be knowledgeable of the position and function of all
controls.Eachmachinehaslimitations:priortooperateitisnecessarytofamiliarisewithitscapabilities
andspeed,braking,steering, stability andworkingfeatures.
Crawler dozer
WARNING
The machine is shown with optional equipment.
D350M0001
3550

23550
Carefully read personal and machine SAFETY PRECAUTIONS (at the beginning of this manual)
Engine No.
35048946
Family
1CEXLO661AAC
FR
Date of Mfg.
11/01
Model
QSM11-C
Ref. No.
S052008
Advert. Power HP/KW
Fuel rate at Advert. Power
Inj. Set IN/mm
Valve Lash Cold IN/mm
330/246
155
.025 LASH
.025 / .356
at
2100
RPM
mm 3
stroke
Int.
Idle Speed RPM
650 - 1000
CID/L
661/10.8
Inj.Timing
KV
CPL
2828
.027/.686
Exh.
Cummins Engine Company, Inc.
Assembled in the U.S.A.
NOx FEL
PM FEL
4060493
Cummins
WARNING;Injury may result and warranty is voided if
fuel rate, RPM, or altitudes exceed published maximum
values for this model and application.
IMPORTANT ENGINE INFORMATION :
This engine conforms to
2001
U.S.EPA and CaliforniaTier 2 and EU
Stage II regulations for heavy
duty nonroad compression ignition diesel cycle
engines as applicable.
THIS ENGINE IS CERTIFIED TO
OPERATE ON DIESEL FUEL.
Warranty Start Date
B.Machineidentificationplate
The identification plate contains the main data of the
machine and it is visible under the operator's seat.
C. Marking and serial number of frame
The MARKING of the machine is seen on the left
side of the transmission housing.
In the lower side it is readable:
- manufacturer code (the first 3 digits) FNH;
-themachinecode03550N;
- the serial number (last 8 digits).
IDENTIFICATION DATA
MODEL MARKING
3550 Power Steering ✩FNH03550NBHC05001 ✩
D350M0005
A. Engine data plate
Thedata plate canbe seen openingthe left sidepanel
oftheenginecompartment,containingtheidentification
dataandotherimportantinformationontheengine.
1. Serialnumberoftheengine
(E.S.N.EngineSerialNumberCummins)
➤
1
D350M0002
D350M0003
3550-M001

3
Carefully read personal and machine SAFETY PRECAUTIONS (at the beginning of this manual)
3550
Machinemanufacturedby:
CNH Italia S.p.A., Via Plava, 80
10135Torino - Italy
in the LECCE Plant
Address: ZonaIndustrialeSurbo
73100LECCE(LE)
Telephone: [phone]
QUANTITATIVE SIDES OF COMFORT
Noiseattheoperator'sseat
Evaluatedon identical machines,complying with the
prescriptions of standard EEC 95/27 ISO 6396
- Standard machine (with cab)
LpA = 83 dB (A)
SERVICE
Fortheserviceoperationsnoteasilyperformedwiththe
meansavailabletotheUser.itisrecommendedthatyou
contacttheSalesOrganizationortheServiceCentres,
whichhaveavailableskilledpersonnel,adequatetooling
andgenuine spareparts. The entireOrganization isat
thedisposalofCustomerstoprovideclarificationsand
recommendationsortointervenewithitsskilledperson-
nel,wheneveranirregularoperationisexperiencedon
yourmachine.
SPAREPARTS
Toensureaperfectperformanceofthemachine,you
areremindedthatpartsmustbereplacedexclusively
withgenuinespares.
To order them it is necessary to specify:
- typeandserialnumberofthemachine(plateB)(pag.2);
- type and serial number of the engine (plate C);
- the partnumber of thepartbeingordered.
This machine complies with the EEC Directives
relative to safety of machines (Directives 89/392,
91/368,93/44and93/68)
Noiseoutside themachine
Evaluated on identical machines, complying with
theprescriptionsof standard 2000/14/EC
- Machinewithoutsidesoundsuppressingversion
LWA = 113 dB (A)
- -Standardmachine
LWA = 118 dB (A)

43550
Carefully read personal and machine SAFETY PRECAUTIONS (at the beginning of this manual)
GENERAL SPECIFICATIONS
Fuelsystem
The fuel pump sucks the fuel from the tank. be-
tween the tank and the fuel pump, the fuel flows
through two interchangeable cartridge fuel filters,
one a water separator, the other filtering the impu-
rities in the fuel.
Airintake
Dry air cleaner with replaceable paper cartridges,
turbochargedbyturbochargertypeHOLSETHX55
TURBOequippedwithWASTGATEvalveandafter
cooler.
TRANSMISSION
Hydraulic torque converter with maximum stall ratio
2.3 : 1.
"Power shift" transmission, with three forward and
three reverse speeds, with electric FINGER TIP
CONTROL. Neutral button cutting-off directly the
speedengaged,shiftingthetransmissionintoneu-
tral.
AUTO SHIFT function button.
Safetydeviceleverthatin"locked"positionprevents
the gear shifting of the transmission and engages
automatically the service brakes.
Oilcoolingofthetorqueconverter/transmissioncircuit
byoil-airradiator.
Transmission oil filtration by two full flow filters; one
metalmeshandmagneticrodonsuction,theotheron
the delivery with built-in by-pass valve.
Finaldrives
Central reduction with bevel gear set at the centre of
thereartransmission housing.
Singlereduction final drive.
Planetarygearfinaldrive.
Reduction ratio 1 : 15.6.
Oil-bathlubrication.
ENGINE
Theenginecomplieswiththeregulationsrelative
to fume emissions "TIER2".
Type ..................... CUMMINSQSM11-330/365HP
Directinjection,turbocharged,after-cooled,4-stroke
diesel
Bore ............................................................125mm
Stroke .........................................................147mm
Totaldisplacement........................................10.82 l
Compressionratio ....................................... 16.3 : 1
6in-linecylinders, firing order..................1-5-3-6-2-4
Max. net power at flywheel:
- 221 kW at 2100 rpm
- 253 kW at 1800 rpm
Maximumtorque(at1400rpm) ............ 167,4daNm
Lubrication
Forcedlubrication by geartype pump.
Minimumallowablelubrication:
- At low idle ..................................... 0.8 bar (12 Psi)
- At nominal speed ........................ 2.04 bar (35 Psi)
Quantity of oil in the sum .... 35 litres (9.2 U.S. Qts.)
Coolantsystem
Water, circulated by centrifugal pump, integrally
mounted. The coolant flows from the oil heat ex-
changer in the block, then passing to the cylinder
head.
Radiatorequippedwith8-bladeblowingfan.
Water circulation from the engine to the radiator
regulatedbythermostat.
Thermostatsetting ..................................82 ÷ 93 °C
Max.opening ..................................................95°C
Temperatureinuppertank
Maximumallowed ......................................101,6°C
Minimumrecommended ................................100°C

5
Carefully read personal and machine SAFETY PRECAUTIONS (at the beginning of this manual)
3550
STEERINGDIFFERENTIAL
The steering differential provides the steering of the
machinewithoutstoppingthetrackchain,transmitting
continuously power to both track chains when steer-
ing, also with tight turns. With both track chains
moving,itispossibletopushlargerloadsatmaximum
speed as well.
The steering occurs by increasing the speed of one
trackchainandtheslowing-downoftheother one, in
equal measure. The speed differential makes the
machine steer. The steering system operates as a
differentialanditiscomposedof:apump,ahydraulic
motor and the relevant controls actuated by a single
movement of the fingers.
BRAKES
Oil-bathdiscbrakes
The single pedal in the cab actuates simultaneously
the brakes of both track chains, both as service and
emergency devices. The machine is prevented from
moving with the parking brakes engaged. A manual
system provides the disengagement of the brakes
when there is no hydraulic pressure, to provide the
towing of the machine in the event of failure.
Parking brake: automatically engaged, by lowering
the transmission safety lever or engine inoperative.
HYDRAULICSYSTEM
The hydraulic system, fully load-sensing, controls
withthebestefficiency,the hydraulic power required
by the steering/equipment circuits.
Thedeliveryonthesteeringcircuitisprioritisedwhen
powerisrequestedatthesametime,ontheequipment
controls. The circuit is composed of a variable dis-
placement piston pump and an hydraulic motor, dis-
tributingpowerappropriatelytoeachtrackchainduring
thesteering.
UNDERCARRIAGE
Composed by two frames of a boxed and welded
structuretype.Theframesareconnectedfrontallyby
aswingingcross-memberandarehingedattherearon
thePIVOT-SHAFT.
Lubricatedtrack chains.
Sevenpermanentlylubricatedbottomrollersandtwo
support rollers for each track frame.
Sprocketswithreplaceablesectors toothed crown.
Permanently lubricated idlers, with hydraulic track
chaintensioner.
- Number of bottom rollers per track chain:........... 7
- Number of supportrollers pertrack chain:.......... 2
- Number of shoes per track chain: .................... 44
- Width of standard shoes: .........................610mm
optional: ...............711mm
ELECTRICALSYSTEM
Power voltage 24 Volt.
Alternator:DELCOREMY70Amp.
Starter motor: DELCO REMY 9.5 kW (type 42 MT)
Startermotorwithsolenoidoperatedautomaticpinion
engagement.
Batteries:Two12Voltbatteriesconnectedbatteries,
180Amp.
Maintenance-freetype.
CAB
Modular type cab, elastically mounted on elastic
blocks, integrated by FOPS safety structure.
The cab ensures an excellent visibility of the
blade and the rear attachments for maximum
productivity.
Also, the cab ensures maximum comfort to the
operator at all times.

63550
Carefully read personal and machine SAFETY PRECAUTIONS (at the beginning of this manual)
WEIGHTANDSPEEDS
Theweight ofthe machinewith HSU bulldozer blade
plus arms and lifting cylinders plus linkages, without
ripper, safety cab, fluids and operator: 35,900 kg
(79,150lbs)
Maximumspeeds(forward-reverse)inkm/h:
Speeds I II III
- forward 3.8 6.1 10.3
- reverse 4.4 7,1 11.4
RIPPER (optional)
Model...................................................... RPMD350
Of a parallelogram type, with welded plate element
frame. Three position tool bar with a semi curved type
tool, with interchangeable tips.
Controlled by 4 double stroke hydraulic cylinders.
Weight: .................................... 3,200kg (7,050 lbs)
AUXILIARYAPPLICATIONS
Some of the equipment described and illustrated in
this Manual are provided in determined markets to
satisfy specific requirements.
Other devices and special applications are provided
uponrequest,inagreementwiththeSalesOrganisa-
tion.

7
Carefully read personal and machine SAFETY PRECAUTIONS (at the beginning of this manual)
3550
BLADETYPE
Semi-U(HSU)
Angolable(HA)Ž
Full-U(HU)
Blade
width
mm
3975
4620
4295
Blade
height
mm
1700
1145
1650
Blade
capacity
m3
9.1
4.5
11.4
Tilt
mm
900
470
975
Pitch
13°
10°
13°
Digging
depth
mm
600
685
600
Bladelifting
fromground
mm
1220
1140
1220
MAIN DIMENSIONS
3243
5282
8234
3500
2134
2744
(*)
3375
D350M0006
Ž Maximumangle:± 25°.
520
(*) 610 mm shoes or 711 mm shoes