Komatsu PC850-8 BACKHOE User manual

www.Komatsu.com
CEN00073-04 Materials and specifications are subject to change without notice.
is a trademark of Komatsu Ltd. Japan.
Printed in Japan 200809 IP.As(05)
STANDARD EQUIPMENT
ENGINE AND RELATED ITEMS:
●Air cleaner, double element, dry
●Variable speed cooling fan, with fan guard
●Engine, Komatsu SAA6D140E-5
ELECTRICAL SYSTEM:
●Alternator, 50 amp, 24 V
●Batteries, 170 Ah, 2 x 12 V
●Starting motors, 11kW
●Working lights-2 boom, 2 cab top front, 1 cab bottom
●Step light with timer
●Auto decelerator
UNDERCARRIAGE:
●610 mm 24'' double grouser
●8 track/3 carrier rollers (each side)
●Hydraulic track adjusters (each side)
●Variable track gauge
●Sealed track
GUARDS AND COVERS:
●Dust-proof net for radiator and oil cooler
●Pump/engine room partition cover
●Travel motor guards
●Strengthened revolving frame underguard
●OPG top guard (operator protective guards ISO 10262 level 2 (FOG))
OPERATOR ENVIRONMENT:
●Damper mount, all-weather, sound-suppressed cab with tinted
safety glass windows, lockable door, intermittent window wiper
and washer, floormat, cigarette lighter and ashtray
●Multi-function color monitor, electronically-controlled throttle dials,
electric service meter, gauges (coolant temperature, hydraulic oil
temperature and fuel level), caution lights (electric charge, engine
oil pressure, and air cleaner clogging), indicator lights (engine
preheating and swing lock light) level check lights (coolant, engine
oil, and hydraulic oil level), self-diagnostic system with trouble
data memory
●Rear view mirror (R,H)
●Seat, fully adjustable with suspension
●Cab with fixed front window
HYDRAULIC CONTROLS:
●Fully hydraulic, with Electronic Open-Center Load-Sensing
(EOLSS) and engine speed sensing (pump and engine mutual
control system)
●Two axial piston motors for swing with single-stage relief valve
●One axial piston motor per track for travel with counter balance
valve
●Two variable capacity piston pumps
●Two control valves, 5+4 spools (boom, arm, bucket, swing, and
travel)
●Control levers, wrist control levers for arm, boom, bucket, and
swing with PPC system
●Control levers and pedals for steering and travel with PPC system
●Oil cooler
●In-line filter
●Heavy lift mode system
●Shockless boom control
●Swing priority selection system
●Two-mode setting for boom
DRIVE AND BRAKE SYSTEM:
●Brakes, hydraulic lock travel brakes, oil disc parking
●Hydrostatic two travel speed system with planetary triple reduction
final drive
OTHER STANDARD EQUIPMENT:
●Automatic swing holding brake
●Counterweight, 11850 kg 26,120 lb
●Horn, electric
●Marks and plates, English
●Paint, Komatsu standard
●Large handrails
●One-touch engine oil drainage
●PM tune-up service connector
●Remote greasing for radiator fan drive
●Travel alarm
●Rear reflector
●Anti-slip plates
●Corrosion resistor
OPTIONAL EQUIPMENT
●Alternator, 75 Amp, 24 V
●Air suspension seat
●Arms (Backhoe):
PC850-8:
—3600 mm 11'10'' HD arm assembly
PC850SE-8:
—2945 mm 9'8'' SE arm assembly
—3600 mm 11'10'' HD arm assembly
●Auto air conditioner
●Booms (Backhoe):
PC850-8:
—8040 mm 26'5'' boom assembly
PC850SE-8:
—7100 mm 23'4'' boom assembly
●Cab front guard (ISO 10262 level 2)
●Catwalk
●Coolant heater
●Double flange track roller
●12V electric supply
●Fire extinguisher
●General tool kit
●Grease gun, electric pump with indicator
●Interconnected horn and warning light
●Large-capacity batteries
●Lower wiper
●Provision for fast fuel fill
●Radio AM/FM
●Rain visor
●Rear view mirror (L,H)
●Seat belt 78 mm 3''
●Shoes:
—710 mm 28'' double grouser
●Spare parts for first service
●Track frame undercover (center)
●Vandalism protection locks
HORSEPOWER
Gross: 370 kW 496 HP @ 1800 rpm
Net: 363 kW 487 HP @ 1800 rpm
OPERATING WEIGHT
PC850-8: 78700–79500 kg
173,500–175,270 lb
PC850SE-8: 78300–79100 kg
172,620–174,380 lb
Photo may include optional equipment.
PC850-8 BACKHOE
PC850SE-8 BACKHOE
PC
850
HYDRAULIC EXCAVATOR

2
WALK-AROUND
HYDRAULIC EXCAVATOR HYDRAULIC EXCAVATOR
PC850-8
PC850-80
HORSEPOWER
Gross: 370 kW 496 HP @ 1800 rpm
Net: 363 kW 487 HP @ 1800 rpm
OPERATING WEIGHT
PC850-8: 78700– 79500 kg
173,500–175,270 lb
PC850SE-8: 78300– 79100 kg
172,620-174,380 lb
Ecology and Economy Features
●Komatsu SAA6D140E-5 Engine Meets Tier 3 Emissions Regulations.
• World’s first cooled EGR system with bypass-assist type electronically
controlled venturi
• Offers high power and low fuel consumption, while conforming to
Tier 3 emission regulations.
• Reduces NOx emission approximately 40%.
• Equipped with an electronically controlled variable speed fan.
●Economy Mode Four-level Setting
Enables operator to select the appropriate Economy mode level to match
production requirement with lowest fuel consumption.
●Reduction of Ambient Noise
Meets the EU Stage 2 noise regulations.
• Electronically controlled variable speed fan drive
• Large hybrid fan
• Glasswool-furnished low-noise muffler and noise reducing cover around
the muffler
See page 4.
Working Environment
●Large Comfortable Cab
• Low noise and vibration with cab damper mounting
• Large-capacity air conditioner (optional)
• Pressurized cab prevents external dust from entering
• OPG top guard level 2 (by ISO 10262 standard)
capable with optional bolt-on top guard.
See pages 8, 9.
Advanced Monitor Features
• Machine condition can be checked with
Equipment Management Monitoring System
(EMMS). See page 11.
• Two working modes combine with heavy lift
mode for maximum productivity. See page 5.
Photo may include optional equipment.
Easy Maintenance
●Easy Cleaning of Cooling Unit
Fan reverse-rotation function
facilitates clogged radiator cleaning.
●Centralized Arrangement of Engine
Checkpoints
●Anti-slip Plates for improved foot
traction
●Large Handrail, Step and Catwalk
provide easy access to the engine
and hydraulic equipment.
●Increased Fuel Tank Capacity
See page 10.
●Highly Reliable Electronic Devices
Exclusively designed electronic devices have
passed severe testing.
• Controllers • Sensors • Connectors
• Heat resistant wiring • Circuit breaker
●Boom Foot Hoses are arranged under the boom
foot, improving hose life and safety.
See page 6.
Excellent Reliability and Durability
●KMAX Bucket Teeth offer superior penetration and long-
term sharpness.
●Fuel Pre-filter with water separator equipped as standard.
●O-ring Face Seals, which have excellent sealing
performance, are used for the hydraulic hoses.
●High-pressure In-line Filtration
The cool-running hydraulic system is protected with the
most extensive filtration system available, including a
high pressure in-line filter for each main pump.
Productivity Features
●High Work Equipment Speed
Increased arm dumping and bucket
dumping speed realize efficient loading
operation.
●Heavy Lift Mode
The heavy lift mode increases lifting force by
10%.
●Large Digging Force
High operation efficiency with large digging
force for severe applications.
●Two-mode Setting for Boom
Switch selection allows either powerful
digging or smooth boom operation.
●Twin Swing Motor System provides excellent
swing performance, even on slopes.
●Large Drawbar Pull and Steering Force
provide excellent mobility.
●Swing Priority Mode
The swing priority mode improves efficiency
for loading dump trucks.
●Shockless Boom
Switch selection reduces chassis vibration
after sudden stops.
See page 5.
3

54
PRODUCTIVITY & ECOLOGY FEATURES
HYDRAULIC EXCAVATOR PC850-80
Working Mode Application Advantage
Power ●Maximum production/power
PMode ●Fast cycle time
EEconomy ●Good cycle time
Mode ●Good fuel economy
Working Mode Selection
Power and Economy Mode
The PC850-8 excavator is equipped with two working
modes. Each mode is designed to match engine flow, pump
speed, and system pressure to the current application, giving
the operator flexibility to match equipment performance to
the job at hand.
Environment-friendly Clean Engine Mounted
The PC850-8, which is equipped with the Komatsu
SAA6D140E-5 engine, meets the Tier 3 emission
regulations in North America (EPA) and EU Stage 3A.
The SAA6D140E-5 engine adopts the world’s first cooled
EGR system with electronically controlled bypass-assist type
venturi. NOx emission is reduced 40%, while maintaining
high power and low fuel consumption.
Electronically Controlled Variable Speed Fan
Contributes to Low Fuel Consumption and Low
Noise
The electronic control system sets
the rotational speed of the cooling fan
according to the coolant, hydraulic oil,
and ambient temperature; effectively
uses the engine output to prevent
wasteful fuel consumption; and
reduces noise during low-speed fan
rotation.
Lower and Economical Fuel
Consumption Using
Economy Mode
Enables operator to set the Eco
mode to up to four levels
according to working conditions
so that production requirement is
achieved at lowest possible fuel consumption.
Reduction of Ambient Noise (optional)
Reduced noise by adoption of an electronically controlled
variable speed fan drive, large hybrid fan, low-noise muffler
and cover with glasswool, to meet EU Stage 2 noise
regulations.
(E0,E1,E2,E3)
Pump for fan
Electronic control
unit for engine
Electronically controlled
variable speed fan
Hydraulic system
controller
LCD color monitor
Engine
Heavy duty HPCR
(High Pressure
Common Rail)
system
Electronically controlled cooled
EGR system
Hydraulic control valve
Main pump
Komatsu Technology
Komatsu develops and produces all major
components, such as engines, electronics
and hydraulic components, in house.
With this “Komatsu Technology,” and adding
customer feedback, Komatsu is achieving
great advancements in technology.
To achieve both high levels of productivity and
economical performance, Komatsu has
developed the main components with a total
control system. The result is a new generation
of high performance and environment friendly
excavators.
This is an image photo: may
differ from the actual engine.
Selection
ON
OFF
Result
Oil flow to the swing motor is increased.
180˚loading operations are most efficient.
Oil flow to the boom is increased.
90˚loading operations are most efficient.
Heavy Lift Mode
Gives the operator 10% more lifting force on the boom when
needed for handling rock or heavy lifting applications.
Swing Priority Setting
The swing priority setting allows the operator to use the same
easy motion for 180˚ loading as 90˚ loading operations. By
altering the oil flow, this setting allows you to select either
boom or swing as the priority for increased production.
Power Mode
Economy Mode
Heavy Lift Mode
Swing Priority Mode
Large Digging Force
Thanks to the high engine output and an excellent hydraulic
system, this machine demonstrates powerful digging force.
Maximum arm crowd force (ISO):
298 kN 30.4 ton
Maximum bucket digging force (ISO):
363 kN 37.0 ton
Work Equipment Speed Increased
An arm quick return circuit is provided for arm dumping. This
returns a portion of oil flow directly to the hydraulic tank at
arm dumping to reduce the hydraulic pressure loss.
Combined with increased bucket dumping speed, faster
loading work is realized.
Large Drawbar Pull and Steering Force
Since the machine has a large drawbar pull and a high
steering force, it demonstrates excellent mobility even when
it is being used on inclined sites.
Two-mode Setting for Boom
Smooth mode provides easy operation for gathering
blasted rock and scraping operations. When maximum
digging force is needed, switch to power mode for more
effective excavating.
Shockless Boom Control
The PC850-8 boom circuit features a shockless valve
(double-check slow return valve) to automatically reduces
the amount of vibration present when operating the boom.
Operator fatigue is reduced (which can improve safety and
productivity), and spillage caused by vibration is minimized.
Extend and
retract
HYDRAULIC EXCAVATOR
PC850-8
Smooth
mode
Boom raise
Powe r
mode

7
6
RELIABILITY FEATURES
HYDRAULIC EXCAVATOR PC850-80
Strengthened Quarry Bucket Provides Outstanding Wear-resistance
The bucket for specific use in quarry is impact and wear resistant, providing high performance and long life.
Koma-hard materials* provide excellent wear resistance. Combined with adoption of long-life KMAX teeth, durability of bucket
is drastically enhanced.
* Koma-hard materials (KVX materials):
Komatsu developed, wear-resistant, reinforced materials.
Brinell hardness: 500 or more (180kgf/mm2class).
Features high wear-resistance and little quality change
from the heat generated during rock loading, maintaining
long term hardness.
Excellent Reliability and Durability
Boom Foot Hoses
The boom foot hoses are arranged
under the boom foot to reduce hose
bend during
operation,
extending hose
life and
improving
operator safety.
Metal Guard Rings
Metal guard rings protect all the
hydraulic cylinders and improve
reliability.
Sturdy guards shield the travel motors
and piping against damage from rocks.
High-pressure In-line Filtration
The PC850-8 has the most extensive
filtration system available, providing
in-line filters as standard equipment.
An in-line filter in the outlet port of
each main hydraulic pump reduces
failures caused by contamination.
Track roller guard (full length)
Sturdy Undercarriage
The undercarriage is strengthened to
provide excellent reliability and
durability when working on rocky
ground or blasted rock.
Quarry Bucket with KMAX Tooth
High-tensile
strength steel
High-tensile
strength steel
High-tensile
strength steel
Shroud: Enlarged
High-tensile
strength steel
Koma-hard materials
High-tensile
strength steel
KMAX Tooth
• Unique bucket tooth shape, superior digging
performance
• Long-term high sharpness
• Great penetration performance
• Hammerless, safe, and easy tooth
replacement
(Tooth replacement time: Halves the
conventional machine.)
STEP 1
Observing proper safety procedures,
place tooth onto adapter (as shown).
STEP 2
Insert fastener, making sure it is in the
unlocked position (as shown).
STEP 3
Using the correct size socket, rotate the
pin locking shaft 90˚ clockwise (as
shown) to finish the installation.
STEP 4
To remove fastener, use the correct size
socket to rotate the pin locking shaft 90˚
counter-clockwise (as shown). Remove
fastener and tooth. Repeat steps 1-3 for
a new installation.
pin locking shaft
pin locking shaft
Heat-resistant Wiring
Heat-resistant wiring is utilized for the
engine electric circuit and other major
component circuit.
Circuit Breaker
With circuit breaker, the machine can
be easily restarted after repair.
DT-type Connectors
DT-type connectors seal tight and
have higher reliability.
Rock protectors
Photo may include optional equipment.
HYDRAULIC EXCAVATOR
PC850-8
Metal guard ring
(Cast iron ring)
Piston ring
Wear ring
Strengthened Boom and Arm
Thanks to the large cross-sectional
structure employing a high tensile
strength steel with a thick plate,
partition wall, etc., the boom and arm
exhibit excellent durability and are
highly resistant to bending and
torsional stress.
Large cross sectional
structure boom
Arm dent
preventive plate
Partition
wall
Partition
wall
Wide width
arm
Wear plates
O-ring Face Seal
The hydraulic hose seal method has
been changed from a conventional
taper seal to an O-ring seal. This
provides improved sealing
performance during operation.
Frame Structure
The revolving frame mount and center
frame mount on the swing circle are
no welding structure so that force is
transmitted directly to the thick plate of
the frame without passing through any
welding.
Fuel Pre-filter
(with Water
Separator)
Removes water
and contaminants
from fuel to
enhance the fuel
system reliability.
Strengthened Revolving Frame
Underguard
Guards the machine body against
being hit by rocks from below and
prevents hydraulic components and
the engine from being damaged.

89
WORKING ENVIRONMENT
HYDRAULIC EXCAVATOR PC850-80
Large Comfortable Cab
Comfortable Cab
New PC850-8’s cab offers an exceptionally comfortable
operating environment. The large cab enables full flat
reclining of the seat back with headrest.
Pressurized Cab
The optional air conditioner, air filter and a higher internal air
pressure (6.0 mm Aq 0.2" in Aq) prevent external dust
from entering the cab.
Low Noise Design
Noise level is remarkably reduced, not only engine noise but
also swing and hydraulic relief noise.
Low Vibration with Cab Damper Mounting
PC850-8 uses a new, improved cab damper mount system
that incorporates longer stroke and the addition of a spring.
The new cab damper mounting combined with a
strengthened left and right side deck, aids vibration reduction
at the operator’s seat.
Vibration at floor is reduced from 120 dB (VL) to 115 dB (VL).
dB (VL) is index for expressing
size of vibration.
Cab Damper
Mounting
Multi-Layer
Viscous Mount Floor Vibration
Comparison of Riding Comfort
Conditions:
●Traveling over obstacle
one side track
●Traveling speed forward high
Vertical direction on graph shows size of vibration.
Photo may include optional equipment.
Multi-position Controls
The multi-position, PPC (proportional pressure control)
levers allow the operator to work in comfort
while maintaining precise control. A double-slide
mechanism allows the seat and control levers to move
together or independently, allowing the operator
to position the controls for maximum
productivity and comfort.
Safety Features
Step light with timer
provides light for about one
minute to allow the operator to
get off the machine safely.
Pump/engine room partition
prevents oil from spraying on
the engine if a hydraulic hose
should burst.
Thermal and fan guards are
placed around high-temperature
parts of the engine and fan drive.
Seat Sliding Amount: 340 mm 13.4",
increased 120 mm 4.7"
Seat with headrest
reclined full flat
Defroster (optional) Cab Frame Mounted Wiper Bottle Holder and
Magazine Rack
The cab interior is spacious and provides a comfortable working
environment…
Automatic Air Conditioner (optional)
A 6,900 kcal air conditioner
is utilized. The bi-level
control function keeps the
operator's head and feet
cool and warm respectively.
This improved air flow
function keeps the inside of
the cab comfortable
throughout the year.
HYDRAULIC EXCAVATOR
PC850-8
Anti-slip Plates
Spiked plates on working
surfaces provide anti-slip
performance.
Anti-Slip Plates
Horn interconnected with
warning light (optional) give
visual and audible notice of the
excavator’s operation when
activated.
Rigid and Safe Operator's Cab
OPG top guard
The OPG top guard securely
protects the operator's cab and
conforms to the ISO standard.
Single sheet fixed glass
The glass installed in the machine
has excellent visibility since it is
laminated to prevent shortening and
has less vibration.
See-through skylight equipped with a sun shade
The upward visibility is excellent.
Additional head lamp
Night operation is safe.
Lower wiper (optional)
Lower windshield wiper improves
visibility in rain.
Horn interconnected with warning
light (optional) give visual and
audible notice of the excavator’s operation when activated.
Rubber
Silicon
Oil
Spring
Warning light (optional)

HYDRAULIC EXCAVATOR PC850-80
11
EASY MAINTENANCE FEATURES
Komatsu Designed the PC850-8 for Easy Service Access.
Wide Catwalk and Large
Handrails
Easier, safer operator cab access and
maintenance checks.
Easy Checking and Maintenance
of Engine
Engine check points are concentrated
on one side of the engine to facilitate
daily checks. Thermal guards are
placed around high-temperature parts
such as turbocharger.
Reduced Maintenance Costs
Hydraulic oil filter replacement
is extended from 500 to 1000
hours.Engine oil and filter
replacement intervals are
extended from 250 to 500
hours.
Electric Operated Grease Gun
Equipped with Hose Reel
(optional)
Greasing is made easy with the electric
operated grease gun and indicator.
10
Photo may include optional equipment.
One-touch Drain Cock
Easier, cleaner engine oil changes.
Easy Cleaning of Radiator
Reverse-rotation function of the
hydraulic driven fan facilitates cleaning
of the cooling unit. In addition, this
function contributes to reducing
warming-up run time in low temperature
and discharging hot air from the engine
room to keep appropriate heat balance.
Steps Connected to the Machine
Cab
Steps allows access from left hand
catwalk to top of machine for engine
check and maintenance.
Dust Indicator with 5-step
Indication
Informs of air cleaner
clogging in 5 steps to
warn of filter
condition.
Divided Type Engine Cover
The divided engine cover allows
inspection points around the engine to
be easily accessed.
High-Quality EMMS Self-diagnostic System
Maintenance display of the EMMS multi-color monitor (Example)
Normal display Maintenance time display Engine oil replacement display
Abnormal information & checking Function display of the EMMS multi-
color monitor (Example)
Battery charging abnormal display Error code display Display for night work
• Abnormality Checking Function
In case any abnormality should occur, the
monitoring system checks whether
hydraulic pressure, solenoid ON/OFF
status, engine speed, electrical
connections, etc. are in the normal
conditions to keep the machine downtime
to a minimum.
• Maintenance History Memory Function
Maintenance records such as
replacement of engine oil, hydraulic oil,
filters, etc. can be stored.
• Trouble Data Memory Function
All the trouble data are stored to serve as
references for future trouble-shooting.
Grease can drum storage location
Grease gun
The grease gun can be
reached from ground level.
Indicator
Convenient
Utility Space
Utility space
provides great
convenience
to store tools,
spare parts,
etc.
HYDRAULIC EXCAVATOR
PC850-8
Increased Fuel Tank Capacity
Fuel tank capacity is increased from
880 ltr 232 U.S. gal to 980 ltr 259 U.S.
gal to extend operating hours before
refueling.

DRIVES AND BRAKES
Steering control . . . . . . . . . . . . . . . . . . . . . . . Two levers with pedals
Drive method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fully hydrostatic
Travel motor . . . . . . . . . . . . . . . . . Axial piston motor, in-shoe design
Reduction system . . . . . . . . . . . . . . . . . . Planetary double reduction
Maximum drawbar pull. . . . . . . . . . . . . 559 kN 57000 kg 125,660 lb
Gradeability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70%
Maximum travel speed
Low. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8 km/h 1.7 mph
High . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 km/h 2.6 mph
Service brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic lock
Parking brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil disc brake
UNDERCARRIAGE
Center frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H-leg frame
Track frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Box-section
Seal of track. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sealed
Track adjuster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic
No. of shoes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 each side
No. of carrier rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 each side
No. of track rollers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 each side
COOLANT AND LUBRICANT
CAPACITY (REFILLING)
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . . . . 980 ltr 258.9 U.S. gal
Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 ltr 26.4 U.S. gal
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 ltr 15.3 U.S. gal
Final drive, each side . . . . . . . . . . . . . . . . . . . 20 ltr 5.3 U.S. gal
Swing drive . . . . . . . . . . . . . . . . . . . . . . 24.5 x 2 ltr 6.5 x 2 U.S. gal
Hydraulic tank . . . . . . . . . . . . . . . . . . . . . . . 440 ltr 116.2 U.S. gal
OPERATING WEIGHT (APPROXIMATE)
PC850-8: Operating weight, including 8040 mm 26'5" boom, 3600
mm 11'10" arm, SAE heaped 3.4 m34.45 yd3backhoe bucket,
operator, lubricant, coolant, full fuel tank, and the standard equipment.
PC850SE-8: Operating weight, including 7100 mm 23'4" boom, 2945
mm 9'8" arm, SAE heaped 4.3 m35.62 yd3backhoe bucket, operator,
lubricant, coolant, full fuel tank, and the standard equipment.
12 13
SPECIFICATIONS
HYDRAULIC EXCAVATOR PC850-80
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu SAA6D140E-5
Type . . . . . . . . . . . . . . . . . . . . 4-cycle, water-cooled, direct injection
Aspiration . . . . . . . . . . . . . . Turbocharged, aftercooled, cooled EGR
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 mm 5.51"
Stroke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 mm 6.50"
Piston displacement . . . . . . . . . . . . . . . . . . . . . . . . . 15.24 ltr 930 in3
Governor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . All-speed, electronic
Horsepower:
SAE J1995 . . . . . . . . . . . . . . . . . . . . . . . . Gross 370 kW 496 HP
ISO 9249 / SAE J1349* . . . . . . . . . . . . . . . . . Net 363 kW 487 HP
Rated rpm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1800 rpm
Fan drive type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic
Meets EPA Tier 3 and EU Stage 3A emission regulations.
*Net horsepower at the maximum speed of radiator cooling fan is 338 kW 453HP.
HYDRAULIC SYSTEM
Type . . . . . . . . . . . . . . . . . . . . . . . Open-center load-sensing system
Number of selectable working modes . . . . . . . . . . . . . . . . . . . . . . . 2
Main pump:
Type . . . . . . . . . . . . . . . . . . . . . . . Variable-capacity piston pumps
Pumps for. . . . . . . . Boom, arm, bucket, swing, and travel circuits
Maximum flow . . . . . . . . . . . . 2 x 494 ltr/min 2 x 130.5 U.S. gpm
Fan drive pump . . . . . . . . . . . . . . . . . . Variable capacity piston type
Fan drive pump . . . . . . . . . . . . . . . . . . Variable capacity piston type
Hydraulic motors:
Travel. . . . . . . . . . . . . . . 2 x axial piston motor with parking brake
Swing . . . . . . . . . . 2 x axial piston motor with swing holding brake
Relief valve setting:
Implement circuits . . . . . . . . . . . 31.4 MPa 320 kg/cm24,550 psi
Travel circuit . . . . . . . . . . . . . . . 34.3 MPa 350 kg/cm24,980 psi
Swing circuit . . . . . . . . . . . . . . . 28.4 MPa 290 kg/cm24,120 psi
Heavy lift circuit . . . . . . . . . . . . . 34.3 MPa 350 kg/cm24,980 psi
Pilot circuit . . . . . . . . . . . . . . . . . . 2.9 MPa 30 kg/cm2430 psi
Hydraulic cylinders:
Number of cylinders—bore x stroke
Boom. . . . . . . . . . . . . . . . 2 – 200 mm x 1950 mm 7.9" x 76.8"
Arm. . . . . . . . . . . . . . . . . 2 – 185 mm x 1610 mm 7.3" x 63.4"
Bucket
Std . . . . . . . . . . . . . . . . 1 – 185 mm x 1820 mm 7.3" x 71.7"
SE. . . . . . . . . . . . . . . . . 1 – 225 mm x 1420 mm 8.9" x 55.9"
SWING SYSTEM
Driven method . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic motors
Swing reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Planetary gear
Swing circle lubrication . . . . . . . . . . . . . . . . . . . . . . . Grease-bathed
Swing lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil disc brake
Swing speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.8 rpm
PC850-8 PC850SE-8
Operating Ground Operating Ground
Shoes Weight Pressure Weight Pressure
610 mm 78700 kg 128 kPa 78300 kg 127 kPa
1.31 kgf/cm21.30 kgf/cm2
24" 173,500 lb 18.6 psi 172,620 lb 18.5 psi
710 mm 79500 kg 112 kPa 79100 kg 111 kPa
1.14 kgf/cm21.13 kgf/cm2
28" 175,270 lb 16.2 psi 174,380 lb 16.1 psi
WORKING RANGE
BACKHOE DIMENSIONS
BACKHOE BUCKET, ARM, AND BOOM COMBINATION
Unit: mm ft in
These charts are based on over-side stability with fully loaded bucket at maximum reach.
 : General purpose use, density up to 1.8 t/m33,000 lb/yd3 : General purpose use, density up to 1.5 t/m32,500 lb/yd3
— : Not useable
3640 11'11"
840 2'9"
610 24"
3500 11'6"
4110 13'6"
3490 11'5"
When retracted
3195 10'6"
A
B
50 2.0"
1560 5'1"
3670 12'
4000 13'1"
4345 14'3"
R=4400 14'5"
4500 14'9"
5810 19'1"
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2440 8ft
PC850-8 PC850SE-8
Boom length 8040 mm 26'5" 7100 mm 23'4"
Arm length 3600 mm 11'10" 2945 mm 9'8" 3600 mm 11'10"
A Max. digging height 11955 mm 39'3" 11330 mm 37'2" 11055 mm 36'3"
B Max. dumping height 8235 mm 27'0" 7525 mm 24'8" 7430 mm 24'5"
C Max. digging depth 8445 mm 27'8" 7130 mm 23'5" 7790 mm 25'7"
D Max. vertical wall
digging depth 5230 mm 17'2" 4080 mm 13'5" 4260 mm 14'0"
E Max. digging depth
of cut for 8' level 8310 mm 27'3" 6980 mm 22'11" 7680 mm 25'2"
F Max. digging reach 13660 mm 44'10" 12265 mm 40'3" 12710 mm 41'8"
G Max. digging reach
at ground level 13400 mm 44'0" 11945 mm 39'2" 12400 mm 40'8"
H Min. swing radius 5985 mm 19'8" 5645 mm 18'6" 5440 mm 17'10"
Bucket digging force (SAE) 316 kN 391 kN 316 kN
32200 kgf / 70,990 lb 39900 kgf / 87,960 lb 32200 kgf / 70,990 lb
Arm crowd force (SAE) 285 kN 331 kN 285 kN
29100 kgf / 64,150 lb 33800 kgf / 74,520 lb 29100 kgf / 64,150 lb
Bucket digging force (ISO) 363 kN 431 kN 363 kN
37000 kgf / 81,570 lb 43900 kgf / 96,780 lb 37000 kgf / 81,570 lb
Arm crowd force (ISO) 298 kN 341 kN 298 kN
30400 kgf / 67,020 lb 34800 kgf / 76,720 lb 30400 kgf / 67,020 lb
PC850-8 PC850SE-8
8.04 m 26'5" boom 7.1 m 23'4" boom
3.6 m 11'10" arm 2.9 m 9'8" arm
A Overall Height 4850 mm 15'11" 4615 mm 15'2"
B Overall Length 13995 mm 45'11" 13130 mm 43'1"
BUCKET CAPACITY (HEAPED) WIDTH
Without side With side WEIGHT
SAE, PCSA CECE shrouds shrouds (with side shrouds) ARM LENGTH
m3yd3m3yd3mm in mm in kg lb mft in
PC850-8 (use with 8.04 m boom) 3.6 11'10"
3.4 4.45 3.0 3.92 1820 71.7" 1870 73.6" 3500 7,720 
PC850SE-8 (use with 7.1 m boom) 2.9 9'8" 3.6 11'10"
4.0 5.23 3.5 4.58 2000 78.7" 2105 82.9" 4000 8,820 
4.0 5.23 3.5 4.58 2000 78.7" 2105 82.9" 3435 7,570 —
4.3 5.62 3.8 4.97 2150 84.6" 2255 88.8" 3870 8,530 —
4.5 5.87 4.0 5.23 2230 87.8" 2330 91.9" 4050 8,930 —
HYDRAULIC EXCAVATOR
PC850-8
*For heavy duty
*

A Maximum 9.0 m 29' 7.5 m 24' 6.0 m 19' 4.5 m 14' 3.0 m 9'
B CfCsCfCsCfCsCfCsCfCsCfCs
6.0 m *14550 11500 *15100 13950 *16800 *16800
19' *32,100 25,300 *33,300 30,700 *37,000 *37,000
3.0 m 12500 9650 16300 12700 *20850 17450 *27100 25150
9' 27,500 21,300 35,900 28,000 *45,900 38,500 *59,700 55,500
0 m 12800 9800 15300 11750 20650 15800 30000 22650 *32000 *32000
0' 28,200 21,600 33,700 25,900 45,500 34,900 66,200 49,900 *70,500 *70,500
–3.0 m 16550 12700 20500 15700 *27450 22650 *36050 36050 *40700 *40700
–9' 36,400 28,000 45,200 34,600 *60,500 49,900 *79,500 79,500 *89,700 *89,700
LIFTING CAPACITY
14 15
TRANSPORTATION GUIDE
A Maximum 9.0 m 29' 7.5 m 24' 6.0 m 19' 4.5 m 14' 3.0 m 9'
B CfCsCfCsCfCsCfCsCfCsCfCs
6.0 m *12650 11500 *13150 *13150 *14700 *14700
19' *27,900 25,300 *29,000 *29,000 *32,400 *32,400
3.0 m 12500 9650 *15000 12700 *18200 17450 *23800 *23800
9' 27,500 21,300 *33,100 28,000 *40,100 38,500 *52,500 *52,500
0 m 12800 9800 15300 11750 *20250 15800 *26650 22650 *28900 *28900
0' 28,200 21,600 33,700 25,900 *44,700 34,900 *58,800 49,900 *63,800 *63,800
–3.0 m *14900 12700 *18350 15700 *23950 22650 *31500 *31500 *36900 *36900
–9' *32,800 28,000 *40,500 34,600 *52,800 49,900 *69,500 *69,500 *81,300 *81,300
A Maximum 9.0 m 29' 7.5 m 24' 6.0 m 19' 4.5 m 14' 3.0 m 9'
B CfCsCfCsCfCsCfCsCfCsCfCs
6.0 m *10550 8650 *12850 *12850 *14750 *14750
19' *23,200 19,000 *28,400 *28,400 *32,500 *32,500
3.0 m 9600 7250 *15400 12250 *19000 *16700 *25300 *23850
9' 21,200 15,900 *34,000 27,000 *41,800 *36,900 *55,700 *52,600
0 m 9600 7100 14400 10900 19450 14650 28200 20950 *22150 *22150
0' 21,200 15,700 31,800 24,000 42,900 32,400 62,200 46,200 *48,800 *48,800
–3.0 m 11500 8600 14000 10500 18950 14200 *27050 20650 *35650 35050 *28900 *28900
–9' 25,400 19,000 30,900 23,200 41,800 31,300 59,600 45,600 *78,600 77,300 *63,700 *63,700
–6.0 m *14850 14850 *15250 15200 *20000 *20000 *25600 *25600
–19' *32,800 32,700 *33,600 33,600 *44,100 *44,100 *56,400 *56,400
A Maximum 9.0 m 29' 7.5 m 24' 6.0 m 19' 4.5 m 14' 3.0 m 9'
B CfCs CfCs CfCsCfCs CfCsCfCs
6.0 m *9300 8650 *11050 *11050 *12800 *12800
19' *20,500 19,000 *24,400 *24,400 *28,200 *28,200
3.0 m 9600 7250 *13250 12250 *16450 *16450 *22050 *22050
9' 21,200 15,900 *29,200 27,000 *36,200 *36,200 *48,600 *48,600
0 m 9600 7100 14400 10900 *18700 14650 *24850 20950 *19900 *19900
0' 21,200 15,700 31,800 24,000 *41,200 32,400 *54,800 46,200 *43,900 *43,900
–3.0 m 11500 8600 14000 10500 *18150 14200 *23400 20650 *30950 *30950 *26100 *26100
–9' 25,400 19,000 30,900 23,200 *40,000 31,300 *51,600 45,600 *68,300 68,300 *57,500 *57,500
–6.0 m *12600 *12600 *12900 *12900 *17100 *17100 *21900 *21900
–19' *27,700 *27,700 *28,500 28,500 *37,700 *37,700 *48,300 48,300
Unit: kg lb
PC850-8
Equipment:
●Boom: 8.04 m 26'5"
●Arm: 3.6 m 11'10"
●Bucket: 3.4 m34.45 yd3
●Shoe: 610 mm 24"
●Counterweight: 11.85 ton 26,120 lb
A: Reach from swing center
B: Bucket hook height
C: Lifting capacity
Cf: Rating over front
Cs: Rating over side
: Rating at maximum reach
* Load is limited by hydraulic capacity rather than tipping. Ratings are based on SAE standard No. J1097. Rated loads do not exceed 87% of hydraulic lift capacity or 75% of tipping load.
HEAVY LIFTING "OFF"
Unit: kg lb
HEAVY LIFTING "ON"
Unit: kg lb
PC850SE-8
Equipment:
●Boom: 7.1 m 23'4"
●Arm: 2.9 m 9'8"
●Bucket: 4.3 m35.62 yd3
●Shoe: 610 mm 24"
●Counterweight: 11.85 ton 26,120 lb
A: Reach from swing center
B: Bucket hook height
C: Lifting capacity
Cf: Rating over front
Cs: Rating over side
: Rating at maximum reach
HEAVY LIFTING "OFF"
Unit: kg lb
HEAVY LIFTING "ON"
* Load is limited by hydraulic capacity rather than tipping. Ratings are based on SAE standard No. J1097. Rated loads do not exceed 87% of hydraulic lift capacity or 75% of tipping load.
Work equipment assembly (Backhoe)
Weight : PC850-8 : 18.9 t 20.8 U.S.ton
PC850SE-8 : 18.6 t 20.5 U.S.ton
Upper structure
Width : 3290 10'10"
Weight : 26.4 t 29.1 U.S.ton
Base machine
(Both PC850-8 and PC850SE-8 are designed
with the same weight and dimensions.)
Width : 3535 11'7"
Weight : 48.1 t 53.0 U.S.ton
Undercarriage
Weight : 21.7 t [10.85 t x 2]
23.9 U.S.ton [12.0 U.S.ton x 2]
Boom
PC850-8 : 8.1 t : 8380 x 2695 x 1500
8.9 U.S.ton : 27'6" x 8'10" x 4'11"
PC850SE-8 : 7.3 t : 7430 x 2695 x 1500
8.0 U.S.ton : 24'5" x 8'10" x 4'11"
Arm
PC850-8 : 4.5 t : 4770 x 1420 x 750
5.0 U.S.ton : 15'8" x 4'8" x 2'6"
PC850SE-8 : 4.9 t : 4080 x 1695 x 755
5.4 U.S.ton : 13'5" x 5'7" x 2'6"
Bucket
PC850-8 : 3.8 t : 2390 x 1880 x 1870
4.2 U.S.ton : 7'10" x 6'2" x 6'2"
PC850SE-8 : 3.9 t : 2200 x 1950 x 2255
4.3 U.S.ton : 7'3" x 6'5" x 7'5"
Boom & Arm cylinder
Total 2.5 t 2.8 U.S.ton
Others
Weight : 12.2 t 13.4 U.S.ton
Weight : 11.9 t
13.1 U.S.ton
Work equipment assembly (Backhoe)
Weight : PC850-8 : 18.9 t 20.8 U.S.ton
PC850SE-8 : 18.6 t 20.5 U.S.ton
Boom
PC850-8 : 8.1 t : 8380 x 2695 x 1500
8.9 U.S.ton : 27'6" x 8'10" x 4'11"
PC850SE-8 : 7.3 t : 7405 x 2465 x 1500
8.0 U.S.ton : 24'4" x 8'1" x 4'11"
Arm
PC850-8 : 4.5 t : 4770 x 1420 x 750
5.0 U.S.ton : 15'8" x 4'8" x 2'6"
PC850SE-8 : 4.9 t : 4080 x 1695 x 755
5.4 U.S.ton : 13'5" x 5'7" x 2'6"
Bucket
PC850-8 : 3.8 t : 2390 x 1880 x 1870
4.2 U.S.ton : 7'10" x 6'2" x 6'2"
PC850SE-8 : 3.9 t : 2200 x 1950 x 2255
4.3 U.S.ton : 7'3" x 6'5" x 7'5"
Boom & Arm cylinder
Total 2.5 t 2.8 U.S.ton
Others
Weight : 12.2 t 13.4 U.S.ton
Weight : 11.9 t
13.1 U.S.ton
1445 4'9"
5810 19'1"
1400 4'7"
610 2'0"
6900 22'8"
3720 12'2"
1820
6'0"
702.8"
1790
5'10"
5001'8"
9503'1"
319510'6"
1540 5'1"
1790 5'10"
9803'3"
19006'3"
OPG
72kg (159lb)
29kg (64lb) 50kg (110lb)
320010'6"
55kg (121lb)
5001'8"
2509.8"
1820
6'0"
702.8"
1790
5'10"
5001'8"
9503'1"
319510'6"
1540 5'1"
1790 5'10"
9803'3"
19006'3"
OPG
72kg (159lb)
29kg (64lb) 50kg (110lb)
320010'6"
55kg (121lb)
5001'8"
2509.8"
6030 19'9"
2835 9'4"
Transportation specifications (length x height x width)
Backhoe
Specs shown include the following equipment:
PC850-8: Boom 8040 mm 26'5", Arm 3600 mm 11'10", Bucket 3.4 m34.45 yd3, Shoes 610 mm 24" double grouser
PC850SE-8: Boom 7100 mm 23'4", Arm 2945 mm 9'8", Bucket 4.3 m35.62 yd3, Shoes 610 mm 24" double grouser
3 Kits Transportation 4 Kits Transportation
C
B
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A