ompa ct ydra ulic xca vator

FLYWHEEL HORSEPOWER
40.5 kW 54 HP @ 1850 rpm
OPERATING WEIGHT
7670 kg 16910 lb
BUCKET CAPACITY
0.28 m3 0.37 yd3
PC
78UU
Form No. CEN00132-01
Printed in Japan 200805 IP.As(05)
Materials and specifications are subject to change without notice
is a trademark of Komatsu Ltd, Japan
COMPACT
HYDRAULIC EXCAVATOR
Photos may include optional equipment.
www.Komatsu.com
PC78UU-6
COMPACT HYDRAULIC EXCAVATOR
PC78UU-6 Compact Hydraulic Excavator
P
PRODUCTIVITY
RODUCTIVITY
F
FEATURES
EATURES
Two working modes give a choice between
high production and low fuel consumption
Bucket interference prevention system
The bucket automatically stops itself
from contact with the cab/canopy.
During operation, an alarm sounds
and the equipment is stopped if the
bucket gets too close to contact.
This feature helps maintain operator
confidence, which can increase productivity.
Ratio of hourly production (%)
Active mode
Powerful swing
force increases
work efficiency
on slopes
E
Economy mode
Active mode
for higher production
E
Ratio of hourly fuel consumption (%)
Economy mode
for less fuel consumption
Height Limiter
An adjustable boom height limiter can be set prior to operation. When the boom reaches the pre-set height limit, an
alarm will sound and the boom automatically stops. This
function can help increase productivity by letting operators
focus more on digging in tight or confined spaces.
Back fill blade
The PC78UU features a standard
back fill blade that can quickly and
conveniently fill trenches and clear
up jobsites.
Photo may include optional equipment.
Even when 2 or more actuators are operated
simultaneously, the PC78UU-6's pressurecompensated CLSS system ensures that each
actuator works
according to its
control input without
affecting the size of
the load. This gives
the operator precise
control at all times.
Economy mode
100
93
The PC78UU design uses a Tight Tail concept for both
ends. This makes rotating the machine fast, easy and
confident. There is less to worry about in tight space
conditions because there is little protrusion from either
the tail end or the front end.
Digital Depth Display
New pressure-compensated CLSS hydraulic
system HydrauMind
Active mode
Round form uses Tight Tail and Forward
Facing Design
PC78UU-6’s superior traveling
speed and power also provide
higher movility
Ditching, trenching, or digging is even more efficient with this
automatic depth measurement system. Informing the operator
of dig depth from ground level (absolute depth) and the depth
from any pre-set point (relative depth) enables work to go
much more smoothly and efficiently. This lessens the need for
the operator to stop operation or leave the cab after each
adjustment, which also increases productivity.
105
100
2440mm 8'0"
Engine speed sensing=Optimum Power
Power utilized by main pump is adjusted automatically in accordance with the engine speed.
That means this computerized system keeps
engine speed even under high load condition.
1200mm 3'11" 1240mm 4'1"
Lessen
implement
radius
550mm 1'10"
Lessen
tail swing
radius
510mm 1'8"
Road & Bridge Work
180-degree
swing width
2540mm
8'4''
PC60
2
3
PC78UU-6
S
SPECIFICATIONS
PECIFICATIONS
ENGINE
COMPACT HYDRAULIC EXCAVATOR
LIFTING CAPACITY
DRIVES AND BRAKES
PC78UU-6
Two levers with pedals
Steering control
Fully hydrostatic
Drive method
Variable displacement, axial piston motors
Hydraulic motors
65.1 kN 6640 kg 14639 Ib
Maximum drawbar pull
4.5 km/h 2.8 mph
Maximum travel speed: High
3.0 km/h 1.9 mph
Low
Mechanical disk
Parking brakes
Komatsu S4D95LE-3
Water-cooled, 4-cycle, direct injection
Turbocharged
4
3.26 Itr 199 in3
Model
Type
Aspirator
Number of cylinders
Piston displacement
Flywheel horsepower
(SAE J1349 NET)
40.5 kW 54 HP @ 1850 min-1 1850 rpm
UNDERCARRIAGE
HydrauMind (Hydraulic Mechanical
Intelligence New Design) system,
Closed-center system with load-sensing valve
and pressure-compensated valve
Type
Grease
39 each side
1 each side
5 each side
0.33 kg/cm2 4.7 psi
Track Adjustment of the track tension
Number of shoes
Number of carrier rollers
Number of track rollers
Ground Pressure
Pump:
Variable displancement, axial piston
For implement
80.0 Itr x 2 = 160 Itr/min 42.2 USgal/min
Maximum flow
Fixed displacement gear
For swing and blade
60 Itr/min 15.9 USgal/min
Maximum flow
113 Itr/min 29.9 USgal/min
Auxiliary Hydraulic flow (opt.)
Valve rating :
270 kg/cm2 3839psi
Relief valve setting for implement
Relief valve setting for swing and blade
210 kg/cm2 2986psi
Bucket digging force (ISO)
6250 kg 13780 lb
Arm crowd force (ISO)
with arm length 1720 mm 5'8"
3960 kg 8730 lb
OPERATING WEIGHT (APPROXIMATE)
Blade on ground
Operating weight including 1720 mm 5'8" arm, bucket with
0.28 m3 0.37 yd3 capacity, blade, operator, lubricant,
full fuel tank, and standard equipment.
Shoe Width
Operating Weight
450 mm 17.7"
7670 kg 16,910 lb
Fuel tank
Radiator
Engine Oil (Refilling)
Hydraulic (Refilling)
SWING SYSTEM
*4750
*4750
2530
*1810
1730
16'
*5710
5590
*3990
3810
4.0m
*2750
2480
*1760
1140
13'
*6060
5480
*3890
2530
*6430
*6430
*3200
2300
*2350
1080
*1830
890
*14170
*14170
*7050
5070
*5190
2380
*4030
1970
2.0m
*3750
2030
*2490
1010
*1990
770
6'
*8260
4490
*5490
2230
*4390
1700
1.0m
*4060
1810
*2580
940
*2200
720
3'
*8950
3990
*5700
2070
*4850
1590
0.0m
*3970
1690
*2540
880
*2200
730
0'
*8760
3740
*5600
1950
*4850
1620
3.0m
-1m
*3640
*3640
*3550
1670
*2250
860
*2160
830
-3'
*8030
*8030
*7840
3680
*4970
1910
*4770
1840
-2.0m
*3690
*3690
*2760
1710
*2020
1110
-6'
*8130
*8130
*6100
3770
*4460
2440
-3.0m
*1340
*1340
-9'
*2970
*2970
STANDARD EQUIPMENT
• Air cleaner, single element
• Cooling fan, suction type
• Rear view mirror, RH
• Window washer, front
• Rigid seat
• Seat belt
• Heater & Defroster
• Ashtray
• Water separator
• One-touch decelerator
• Shoes,
--- 450mm 17.7" Triple grouser
• Blade
OPTIONAL EQUIPMENT
• Air cleaner, double element
• Suspension seat
• Air conditioner
• Sunvisor
m3 yd3 0.09 0.12 0.12 0.16 0.20 0.26 0.28 0.37 0.34 0.45
12
380 1'3''
5260 17'3''
7330 24'1''
5460 17'11''
2320 7'7''
245 9.6''
3190 10'6''
4230 13'10''
3795 12'5''
2730 8'11''
20 0.8'' 1745 5'9''
735 2'5''
470 1'7''
450 18
550 22
650 26
725 29
450 18
550 22
650 26
750 30
_
ROAD-LINER (optional)
40
4'
1'
'
400 1'4''
130
0
4'3'
'
125 5''
1030 3'5'' 1065 3'6''
750 2'6''
360 1'2''
2325 8'1''
2235 7'4''
2840 9'7''
350 14
mm in
Width, with Sidecutter
Similar to all rubber tracks, pavement is not easily damaged.
1915 6'3''
• Fire extinguisher
• Travel alarm
• Tool kit
• Shoes,
--- 450mm 17.7" Road-Liner
--- 450mm 17.7" Rubber
Width, without Sidecutter mm in
Road-Liners can last up to twice as long as conventional rubber
tracks under most normal operating conditions.
1200 3'11''
6060 19'11''
4145 13'7''
Cs
*2150
*2590
Ideal performance has been achieved with combining the merits
of rubber and the strengths of steel in the new Road-Liner shoes.
Working Range
450 1'6''
1870 6'2''
2320 7'7''
125 Itr 33 USgal
10.5 Itr 2.8 USgal
7.5(7.0) Itr 2.0(1.8) USgal
120(64) Itr 31.7(16.9) USgal
Hydrostatic
10.0 rpm
2540 mm 8'4"
2330 7'8''
1170 3'10''
Cf
*2150
5.0m
Bucket Capacity
Dimensions
Cs
Cf
19'
COOLANT AND LUBRICANT CAPACITY
24 V
55 Ah
25 A
3.0 kW
Driven method
Swing speed
180-degree swing width
Maximum
*Load is limited by hydraulic capacity rather than tipping. Rated loads do not exceed 87% of hydraulic lift capacity or 75% of tipping load.
ELECTRIC SYSTEM
Operating voltage
Battery
Alternator
Starter
Unit : kg lb
4.5m 14'
6.0m
9'
HYDRAULIC SYSTEM
Arm : 1720mm 5'8"
Bucket width : 650mm 25.6"
Shoe width : 450mm 17.7"
1.5m 4'
3.0m 9'
Cf
Cs
Cs
Cf
Reinforced type
Rubber thickness has been upgraded using
a new type of core bar, and this section that
is often sheared has been reinforced.
Replacement is fast and easy.
Repair cost reductions are possible
by replacing only the damaged or
worn-out shoes, which differs from
the need to replace a full rubber or
steel track.
2440
(8feet)
6240 20'6''
6400 21'0''
6
7
PC78UU-6
O
OPERATOR
PERATOR
E
ENVIRONMENT
NVIRONMENT
E
EASY
ASY
M
MAINTENANCE
AINTENANCE
Comfortable operator’s cab
Thin potentiometer adopted and built in
COMPACT HYDRAULIC EXCAVATOR
Hydraulic hose built in
The cab offers comfort and space to help the operator
become even more confident and productive. The
ergonomically designed features help reduce fatigue
and increase focus on the job at hand. The low noise
levels of the engine helps reduce fatigue and can make
the operator even more comfortable.
Low noise design cab
73dB(A)
Engine hood can be
opened and closed
even in confined
areas
Air cleaner with easily
replaceable element
Control pattern
change valve(optional)
Aluminum oil cooler and
radiator are corrosion
resistant and easy to clean
One fuel system
inspection window
for fast and easy
maintenance
Photo:Rigid seat
Upper-rail type sliding
door opens and closes
smoothly
Housing the wiper
motor has greatly
improved visibility
Air conditioner
Large capacity air
conditioning system
combined with carefully
placed vents provide
optimum cool air flow.
Whether you are
comfortable with ISO or
SAE control patterns,
you can easily and
consciously change from
one to the other.
Window washer tank is
easy to check and refill
Smaller and longer lasting hydraulic
oil filter: Ecowhite element
Wide-opening side
hood makes daily
inspection simpler
Easy check of battery liquid level
Large and accessible toolbox
Main valve can be
easily inspected
Large fuel filler with strainer
Work equipment greasing interval is
250h (100h for armtop only)
Inclined track frame top
DT connector
Face seal
Waterproof seal
Standard equipment
Suspension seat
(optional)
Waterproof seal
Waterproof seal
Larger opening reduces
fuel back splash.
Defroster
4
Cup holder
Ceiling window
The track frame is
sloped so that dirt
will not be accumulate and can be
removed easily.
Water-resistant DT
connectors are used for
the parts which water will
be splashed over.
O-ring face seals having
high sealing performance
are used for the hydraulic
piping joints.
5