Komatsu PC750-7 BACKHOE User manual

STANDARD EQUIPMENT
ENGINE AND RELATED ITEMS:
●Air cleaner, double element, dry
●Cooling fan, with fan guard
●Engine, Komatsu SAA6D140E-3
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
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 pre-
heating and swing lock light) level check lights (coolant, engine
oil, and hydraulic oil level), self-diagnostic system with trouble
data memory
●Seat, fully adjustable with suspension
●Cab with pull-up type front window
●Rear view mirror (R,H)
HYDRAULIC CONTROLS:
●Fully hydraulic, with Electronic Open-Center Load-Sensing
(EOLSS) and engine speed sensing (pump and engine mutual
control system)
●One gear pump for control circuit
●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
●Corrosion resister
●Counterweight, 9800 kg 21,610 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
OPTIONAL EQUIPMENT
●Additional truck guard
●Alternator, 75 Amp, 24 V
●Arms (Backhoe):
PC750-7:
—3600 mm 11'10'' arm assembly
—4600 mm 15'1'' arm assembly
—5600 mm 18'4'' arm assembly
PC750SE-7:
—2945 mm 9'8'' SE arm assembly
●Auto air conditioner
●Automatic greasing
●Booms (Backhoe):
PC750-7:
—8200 mm 26'11'' boom assembly
PC750SE-7:
—7100 mm 23'4'' boom assembly
●Cab front guard (ISO 10262 level 2)
●Cab with fixed front window
●Catwalk
●Coolant heater
●Counterweight 12000 kg 26,450 lb
●Counterweight remover
●Double frange truck roller
●12V electric supply
●Fire extinguisher
●Full length track guard
●General tool kit
●Grease gun, electric pump with indicator
●High cab mount
●Interconnected horn and warning light
●KOMTRAX
●Large-capacity batteries
●Loading shovel attachments
●Lower wiper
●OPG top guard
●Provision for fast fuel fill
●Radio AM/FM
●Rain visor
●Rear view mirror (L,H)
●Seat belt 78 mm 3'', 50 mm 2''
●Shoes:
—710 mm 28'' double grouser
—810 mm 32'' double grouser
—910 mm 36'' double grouser
—1010 mm 40'' double grouser
●Spare parts for first service
●Strengthened revolving frame underguard
●Sun visor
●Track frame undercover (center)
●Travel alarm
●Vandalism protection locks
www.Komatsu.com Printed in Japan 200801 IP. As(05)
CEN00301-01 Materials and specifications are subject to change without notice
is a trademark of Komatsu Ltd. Japan
Photo may include optional equipment.
FLYWHEEL HORSEPOWER
338 kW 454 HP @ 1800 rpm
OPERATING WEIGHT
PC750-7: 72370– 74980 kg
159,550– 165,300 lb
PC750SE-7: 73170– 75780 kg
161,310– 167,060 lb
PC750-7 BACKHOE
PC750SE-7 BACKHOE
PC750-7 LOADIN G SHOVEL
PC
750
HYDRAULIC EXCAVATOR

3
●Protected hydraulic circuit
The cool-running hydraulic system is protected with
the most extensive filtration system available, includ-
ing a high pressure in-line filter for each main pump.
●Sturdy guards shield the travel motors against
damage from rocks.
●Highly Reliable Electronic Devices
Exclusively designed electronic devices have passed
severe testing.
- Controller - Sensors - Connectors
- Heat resistant wiring
See page 6.
FLYWHEEL HORSEPOWER
338 kW 454 HP @ 1800 rpm
OPERATING WEIGHT
PC750-7
72370– 74980 kg
159,500 – 165,300 lb
PC750SE-7
73170– 75780 kg
161,310 – 167,060 lb
PC750-7
HYDRAULIC EXCAVATOR
Harmony with Environment
●Low emission engine
Powerful turbocharged and air-to-air aftercooled Komatsu SAA6D140E-3
engine provides 338 kW 454 HP.
See page 4.
Large Comfortable Cab
●Low noise and vibration with cab damper mounting
●Large-capacity cab with narrow corner posts provides
improved visibility
●Large-capacity air conditioner (optional)
●Pressurized cab prevents external dust from entering
See page 8.
Easy Maintenance
●Replacement interval is extended
for new hydraulic filter.
See page 7.
Advanced monitor features
●Machine condition can be
checked with Equipment
Management Monitoring System
(EMMS).
●Two working modes combine
with heavy lift mode for maxi-
mum productivity. See page 5.
Large handrail, step and catwalk
provide easy access to the engine and
hydraulic equipment.
See page 7.
2
PC750-7 Series Hydraulic Excavator
W ALK -A ROUND
W ALK -A ROUND
●Large digging force
High operation efficiency with
large digging force in rugged
work sites
●Large size bucket
The wide and shallow contour
facilitates loading.
●Heavy lift mode
The heavy lift mode increases
the lifting force by 10%.
●Swing priority mode
The swing priority mode
Productivity Features
Excellent Reliability and Durability
●Shockless boom
Switch selection reduces chassis vibration
after sudden stops.
●Boom foot hoses are arranged under
the boom foot, improving hose life and safety.
●Face seals, which have excellent sealing
performance, are used for the hydraulic
hoses.
See page 5,6.
improves efficiency for loading dump
trucks.
●Two-mode setting for boom
Switch selection allows either powerful
digging or smooth boom operation.
●Fuel consumption is reduced 12%
with Economy Mode.
●Large drawbar pull and steering
force provide excellent mobility.
●Excellent Swing Performance
provides excellent swing performance on slope.
See page 4,5.
Photo may include optional equipment.

Working Mode Application Advantage
Active ●Maximum production/power
AMode ●Fast cycle times
EEconomy ●Good cycle times
Mode ●Good fuel economy
Hydraulics
Unique two-pump system assures smooth compound movement of the
work equipment. OLSS (Open Center Load Sensing System) controls all
pumps for efficient engine power use. This system also reduces hydraulic
loss during operation.
Active and Economy mode
The PC750-7 excavator is equipped with two working modes. Each mode
is designed to match engine speed, pump speed, and system pressure to
the current application, giving the operator flexibility to match equipment
performance to the job at hand.
5
Multi-Function
Color Monitor
PC750-7
HYDRAULIC EXCAVATOR
Working Mode Selection
Heavy Lift Mode
Gives the operator 10% more lifting force on the boom
when needed for handling rock or heavy lifting applications.
Two Settings for the 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.
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.
Shockless Boom Control
The PC750-7 features a shockless
valve (double-check slow return valve)
that 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 prevented.
Two Working Modes
Heavy Lift Mode
Engine
The PC750-7 gets its exceptional power and work capacity
from its Komatsu SAA6D140E-3 engine. Output is
338 kW 454 HP providing more hydraulic power.
In addition, the fuel consumption is reduced by 12%
when using Economy Mode.
Large Digging Force
Thanks to the high engine output and an excellent hydraulic
system, this machine demonstrates powerful digging force.
Large Drawbar Pull and Steering Force
Since the machine has a large drawbar pull and a high steer-
ing force, it demonstrates excellent mobility even when it is
being used on inclined sites. In addition, this machine is
equipped with an automatic travel speed shifting system,
which makes automatic Hi/Lo shifts.
Excellent Swing Performance
Twin-swing motor system of PC750-7 provides excellent
swing performance on slope.
Excellent Machine Stability
The rear center of gravity and the 9.8 tonne
10.8 U.S. ton counterweight provides the stability and lifting
capacity needed for maximum productivity.
Large Bucket Capacity
Large capacity bucket has large and shallow contour offers
easy loading.
PC750-7: 2.8 - 3.4 m33.66 - 4.45 yd3
PC750SE-7: 4.0 - 4.5 m35.23 - 5.89 yd3
tank capacity (2750
ltr 726.6 U.S. gal)
High Production and Low Fuel Consumption
4
P RODUCTIVITY
F EATURES
P RODUCTIVITY
F EATURES
EMMS (Equipment Management
Monitoring System)
1. Monitor Function
Controller monitors engine oil
level, coolant temperature, bat-
tery charge air-filter restriction,
etc.
The controller finds any abnor-
mality and displays it on the
LCD.
2. Maintenance Monitor Function
informs replacement time of oil
and filters on LCD when the
replacement interval is reached.
3. Trouble Data Memory Function
stores machine abnormalities
(error codes) in the monitor for
effective trouble shooting.
Smooth
mode
Boom raise
Power
mode
Extend and
retract
Swing Priority Mode
Photo may include optional equipment.
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.

Sturdy Undercarriage Guard
The undercarriage is strengthened to
provide excellent reliability and dura-
bility when working on rocky ground
or blasted rock.
PC750-7
HYDRAULIC EXCAVATOR
Sturdy guards shield the travel
motors and piping against damage
from rocks.
7
M AINTENANCE
F EATURES
M AINTENANCE
F EATURES
Easy Maintenance
Komatsu designed the PC750-7 for easy service access.
Wide Catwalk (optional)
Wide walkway for maintenance is pro-
vided around the engine and hydraulic
components, allowing easy access to
inspection and maintenance points.
Divided Type Engine Cover
The divided engine cover allows
inspection points around the engine to
be easily accessed.
Reduced Maintenance Costs
Hydraulic oil filter
replacement is
extended from 500 to
1000 hours.
6
DT-type connectors seal tight and
have higher reliability.
High-pressure In-Line Filtration
The PC750-7 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)
(optional)
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.
R ELIABILITY
F EATURES
R ELIABILITY
F EATURES
Motorized Grease Gun Equipped
with Hose Reel (optional)
Greasing is made easy with the electric
motorized grease gun and indicator.
Excellent Reliability and Durability
Grease can drum storage location
Grease gun
The grease gun can be
reached from ground level.
Indicator
O-Ring Face Seal
The hydraulic hose seal method has
been changed from a conventional
taper seal to an O-ring seal. This pro-
vides improved sealing performance
during vibration.
Photo may include optional equipment.
KOMTRAX®System (optional)
The KOMTRAX system monitors
machine condition, operating status,
operating location, etc., and provides
timely notification of any machine prob-
lems.
Since data is transmitted via satellite
communication system, secure data
communication is possible from any
operating site including a quarry or a
mine, further improving machine relia-
bility.
(There are some countries where this
feature is not in service. Please consult
Komatsu distributor for availability.)
Metal Guard Rings
Metal guard rings protect all the
hydraulic cylinders and improve
reliability.
Heat-Resistant Wiring
Heat-resistant wiring is utilized for the
engine electric circuit and other major
component circuits.
Circuit Breaker
With the circuit breaker, the machine
can be easily restarted after repair.

9
PC750-7
HYDRAULIC EXCAVATOR
Engine/pump room partition
prevents oil from spraying on
the engine if a hydraulic hose
should burst.
Horn interconnected with
warning light (optional) give
visual and audible notice of the
excavator’s operation when
activated.
Safety Features
Engine/pump
room partition
Step light with timer
provides light for about one
minute to allow the operator
to get off the machine safely.
Large handrails (standard) and
wide catwalk (optional) are pro-
vided around revolving frame for
easier and safer access to engine
and hydraulic components.
8
W ORKING
E NVIRONMENT
W ORKING
E NVIRONMENT
Superb Visibility
The PC750-7’s large capacity cab and
increased glass area provide superb front
visibility.
Cab Mounts
The new cab damper mounting reduces
vibration and noise at operator’s seat.
Suspension seat
The suspension seat has been improved
to reduce and absorb vibration transmitted
to the operator. Rigidity adjustment, fore
and aft sliding, as well as up and down
adjustment is available to accommodate
the body-build of operators.
Low Noise Design
The noise levels at the operator’s ear are
decreased by improving the cab mounts
and cab sealing performance.
Multi-Position Controls
The multi-position,
pressure proportional
control levers allow
the operator to work in
comfort while maintaining
precise control.
A double-slide mechanism allows the
seat and controllers to move together
or independently, allowing the operator
to position the controllers for maximum
productivity and comfort.
Pressurized Cab
The optional air conditioner, air filter, and a
higher internal air pressure (6 mm Aq
0.24" in Aq) prevent external dust from
entering the cab.
Cab with fixed front window (optional)
Internal air pressure : 10 mm Aq 0.39" in Aq
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 func-
tion keeps the inside of the cab
comfortable throughout the year.
The cab interior is spacious and provides a
comfortable working environment…
Seat belt shown in photo is optional.
Thermal guards are placed
around high-temperature
parts of the engine and
accessory drive.
Silicon
Oil
Rubber
Spring
Seat with headrest fully reclined
Large Comfortable Cab
( )
Photo may include optional equipment.