Komatsu PC78US-8 User manual

www.Komatsu.com
CEN00339-00 Materials and specifications are subject to change without notice.
is a trademark of Komatsu Ltd. Japan.
Printed in Japan 200810 IP.As(10)
HORSEPOWER
Gross: 42.8 kW 57 HP @ 1950 rpm
Net: 41 kW 55 HP @ 1950 rpm
OPERATING WEIGHT
6945– 7535 kg 15,315– 16,615 lb
BUCKET CAPACITY
0.09– 0.34 m30.12– 0.45 yd3
Photo may include optional equipment.
PC78US-8
PC
78US
B
5.0m
16'
3.0m
9'
0.0m
0'
-2.0m
-6'
PC78US-8 Arm : 1650mm 5'5" Bucket : 0.28 m30.37 yd3SAE heaped Shoe width : 450mm 17.7" triple grouser Without blade Unit : kg lb
1.5m 4'3.0m 9'4.5m 14'
1.5m 4'3.0m 9'4.5m 14'
Maximum
Cf
*4060
*8960
Cs
*4060
*8960
Cf
*1790
*3960
*2300
*5070
2650
5850
*2630
*5810
Cs
*1790
*3960
2280
5030
1900
4200
1890
4180
Cf
1500
3320
1370
3020
1360
3010
Cs
1130
2500
1000
2220
1000
2210
Cf
*1780
*3920
1160
2550
1050
2310
1440
3170
Cs
1430
3150
860
1910
760
1690
1050
2330
Cf
*4230
*9330
Cs
*4230
*9330
Cf
*1870
*4130
2660
5880
2590
5710
Cs
*1870
*4130
1920
4230
1850
4070
Cf
*1490
*3290
1540
3400
1370
3020
1330
2930
Cs
1200
2650
1170
2580
1000
2220
960
2130
Cf
*1420
*3140
980
2160
880
1950
1120
2490
Cs
1090
2420
720
1600
640
1410
820
1810
PC78US-8 Arm : 2250mm 7'5" Bucket : 0.20 m30.26 yd3SAE heaped Shoe width : 450mm 17.7" triple grouser Without blade Unit : kg lb
Maximum
                       ! " # $  $ 
 &# $  
PC78US-8 Arm : 1650mm 5'5" Bucket : 0.28 m30.37 yd3SAE heaped Shoe width : 450mm 17.7" triple grouser Blade on ground Unit : kg lb
1.5m 4'3.0m 9'4.5m 14'
1.5m 4'3.0m 9'4.5m 14'
Maximum
Cf
*4060
*8960
Cs
*4060
*8960
Cf
*1790
*3960
*2300
*5070
*3360
*7410
*2710
*5980
Cs
*1790
*3960
*2300
*5070
2010
4430
2000
4410
Cf
*1780
*3930
*2120
*4680
*1510
*3330
Cs
1190
2640
1060
2350
1060
2340
Cf
*1780
*3920
*1670
*3680
*1710
*3770
*1650
*3650
Cs
1500
3310
910
2020
810
1800
1120
2460
Cf
*4230
*9330
Cs
*4230
*9330
Cf
*1870
*4130
*3320
*7330
*3010
*6640
Cs
*1870
*4130
2020
4460
1950
4300
Cf
*1490
*3290
*1570
*3470
*2090
*4600
*1880
*4140
Cs
1260
2780
1230
2710
1060
2350
1020
2260
Cf
*1420
*3140
*1350
*2990
*1520
*3360
*1540
*3400
Cs
1150
2540
770
1700
680
1510
870
1920
PC78US-8 Arm : 2250mm 7'5" Bucket : 0.20 m30.26 yd3SAE heaped Shoe width : 450mm 17.7" triple grouser Blade on ground Unit : kg lb
Maximum
                       ! " # $  $ 
 &# $  
A
B
5.0m
16'
3.0m
9'
0.0m
0'
-2.0m
-6'
A
B
5.0m
16'
3.0m
9'
0.0m
0'
-2.0m
-6'
A
B
5.0m
16'
3.0m
9'
0.0m
0'
-2.0m
-6'
A
LIFTING CAPACITY
COMPACT
HYDRAULIC EXCAVATOR
A: Reach from swing center
B: Bucket hook height
C: Lifting capacity
Cf: Rating over front
Cs: Rating over side
: Rating at maximum reach
B
A
C

HORSEPOWER
Gross: 42.8 kW 57 HP @ 1950 rpm
Net: 41 kW 55 HP @ 1950 rpm
OPERATING WEIGHT
6945 – 7535 kg
15,315 – 16,615 lb
BUCKET CAPACITY
0.09 – 0.34 m3
0.12 – 0.45 yd3
WALK-AROUND
COMPACT HYDRAULIC EXCAVATOR PC78US-8
3
2
Large TFT LCD Monitor
• Easy-to-see and use 7" large multi-
function color monitor
• Can be displayed in 12 languages
for global support.
TFT : Thin Film Transistor
LCD : Liquid Crystal Display
See page 9.
Large Comfortable Cab
• Low noise design cab
• Sliding convex door facilitates easy
entrance in confined areas.
• Large cab improves working space.
See page 6.
Safety Features
• Cab dedicated to hydraulic excavator
for protecting the operator in the
event of a roll over accident.
• Safety enhancement with large side-
view and rear-view mirrors.
See page 7.
Photo may include optional equipment.
Easy Maintenance
• Side-by-side cooling function enables
only the cooling unit to be attached
and detached.
•Easy access to engine oil filter,
engine main fuel filter and fuel drain
valve
•Equipped with the fuel pre-filter (with
water separator)
• Equipped with the Equipment
Management Monitoring System
(EMMS) monitoring system.
See page 8.
Productivity Features
●Tight tail swing
• Excellent operation in tight tail
swing radius design
Tail swing radius: 1240 mm 4'1”
●High mobility
• Large drawbar pull and steering
force are evident when operating
on a slope or other rough terrain.
Max. drawbar pull:
66.9 kN 6820 kgf 15,050 lb
• The machine travel speed
changes automatically to Hi or Lo
at optimal points according to the
travel load.
Ecology and Economy Features
●Low emission engine
A powerful, turbocharged and air-to-air aftercooled Komatsu SAA4D95LE-5 provides 41 kW 55 HP. This engine is EPA
Interim Tier 4 and EU Stage 3A emissions certified without sacrificing power or machine productivity.
●Low operation noise
See page 4.
PC78US-8 COMPACT HYDRAULIC EXCAVATOR
●Mode selection
•Five working modes designed to match engine
speed, pump delivery and system pressure.
•Economy mode improves fuel consumption.
•Eco-gauge for energy-saving
operations
•Extended idling caution
for fuel conservation
See page 5.

Komatsu Technology
Komatsu develops and produces all major
components in house such as engines, elec-
tronics and hydraulic components.
Combining “Komatsu Technology”, and cus-
tomer feedback, Komatsu is achieving great
advancements in technology.
To achieve both high levels of productivity and
economical performance, Komatsu has devel-
oped the main components with a total control
system. The result is a new generation of high
performance and environment-friendly exca-
vators.
4
PRODUCTIVITY & ECOLOGY FEATURES
PC78US-8
Electronic control
unit for engine
Hydraulic system
controller
Engine
Heavy duty HPCR
(High Pressure
Common Rail)
system
Hydraulic control valve
Main pump
Seven-inch TFT liquid crystal display
5
Low Emission Engine
Komatsu SAA4D95LE-5
is EPA Interim Tier 4
and EU Stage 3A
emissions certified.
Working Mode Application Advantage
Power mode ●Maximum production/power P●Fast cycle times
EEconomy ●Good cycle times
mode ●Better fuel economy
LLifting mode ●Engine rpm reduction
Breaker ●Optimum engine rpm,
Bmode hydraulic flow
Attachment ●Optimum engine rpm,
ATT mode hydraulic flow, 2way
Working Modes Selectable
The PC78US-8 excavator is equipped with five working
modes (P, E, L, B and ATT mode). Each mode is designed to
match engine speed and pump speed with the current appli-
cation. This provides the flexibility to match equipment
performance to the job at hand.
Eco-gauge that Assists Energy-saving Operations
The Eco-gauge on the right side of the multi-function color
monitor provides environment-
friendly energy-saving opera-
tion. Allows focus on operation
in the green range with
reduced CO2emissions and
efficient fuel consumption.
E
P
 
E mode
!" 
P mode
LL mode
BB mode
AT T
AT T
AT T
ATT mode
Idling Caution
To prevent unnecessary fuel
consumption, an idling caution
is displayed on the monitor, if
the engine idles for 5 minutes
or more.

Low Operation Noise
Enables low noise operation using the low-noise engine and
methods to cut noise at source.
Electronically controlled common rail type engine
• Multi-staged injection
Low noise design
• Optimal arrangement of sound absorbing materials
• Partition between the cab and engine room
Tight Tail Swing
The narrow swing area is well suited for operation in
confined areas with only a 80mm (3.1") protrusion over
the tracks.
Advantage even in Confined Job Site
Road & bridge work
2990mm

 
   
  9.3''
  3.1''
 
  
2990mm 
1750mm  1240mm 
Short swing radius
High Mobility
The PC78US-8 exceptional travel performance is provided by
large drawbar pull and single pump with double flow, and it
demonstrates superb maneuverability while operating at its
optimum travel speed. It exhibits a large drawbar pull for moving
on job sites, traveling in rough terrain and climbing steep slopes.
Maximum drawbar pull: 66.9 kN 6820 kgf 15050 lb
Two Automatic Travel Speeds
High or low–whichever speed suits the ground and job condi-
tions–can be selected with one touch. As terrain changes,
travel speed will automatically shift up or down within the
selected speed range.
Auto-decel
Engine speed automatically slows down when all control
levers are set in neutral to minimize fuel consumption.
COMPACT HYDRAULIC EXCAVATOR
PC78US-8 COMPACT HYDRAULIC EXCAVATOR
Photo may include optional equipment.

76
WORKING ENVIRONMENT
PC78US-8
Safety Features
Automatic Air Conditioner
Automatic 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 comfort-
able through-
out the year.
Defroster
function keeps
cab glass clear.
Sliding Convex Door
The sliding
convex door
facilitates
easy entrance
in confined
areas.
Large Cab
Large cab provides
ample operation
space. The cab has
wide doorway for
easy access.
Large Comfortable Cab
Multi-position Controls
The multi-position, PPC (pressure
proportional control) levers allow the
operator to work in comfort while main-
taining precise control.
A double-slide mechanism allows the
seat and controllers to move together
or independently, allowing the operator
to position the seat and controllers for
maximum productivity and comfort.
Low Cab Noise
Cab is highly rigid and has excellent
sound absorption ability. Thorough
improvement of noise source reduction
and use of low noise engine, hydraulic
equipment, and air conditioner allows
this machine to generate a low level of
noise.
New Cab Design for Hydraulic
Excavators
The cab is designed specifically for
hydraulic excavators and gains
reinforced strength from the pipe-
structured cab framework. The cab
framework provides the high durability
and impact resistance with very high
impact absorbency. The seat belt
keeps the operator in the seat of the
cab in the event of a roll over.
Thermal and Fan Guards
Thermal and fan guards are placed
around high-temperature parts of the
engine and fan drive.
Pump/engine Room Partition
Pump/engine room partition prevents
oil from spraying onto the engine if a
hydraulic hose should burst.
Lock Lever
When lock lever is placed
in lock position all
hydraulic controls (trav-
el, swing, boom, arm,
bucket and blade) are
inoperable.
Lever shown in
lock position
Side-view and Rear-view Mirrors
Large side mirror and rear mirror allow
the PC78US-8 to meet the new ISO
visibility requirements.
Retractable Seat Belt
Easy-to-use retractable seat belt is
employed.
Travel Alarm
An alarm is installed as standard
equipment to give other workers a
warning when the machine travels in
forward or reverse.
Skylight
Skylight with window can be opened
for overhead visibility.
Wide Visibility
Large cab and extended front glass enable operator to get better visibility.
Emergency Escape Hammer
The cab is equipped
with an emergency
escape hammer for
breaking the rear win-
dow glass in case of an
emergency.
COMPACT HYDRAULIC EXCAVATOR
PC78US-8 COMPACT HYDRAULIC EXCAVATOR
Photo : Rigid seat
Photo : Rigid seat

98
MAINTENANCE FEATURES
External air conditioner
filter
PC78US-8
Large TFT LCD Monitor
Large Multi-lingual LCD Monitor
A large user-friendly color monitor enables safe, accurate and smooth work.
Improved screen visibility is achieved by the use of TFT liquid crystal display that
can easily be read at various angles and lighting conditions. Simple and easy to
operate switches. Industry first function keys facilitate multi-function operations.
Displays data in 12 languages to globally support operators around the world.
EMMS (Equipment Management
Monitoring System)
Monitor function
Controller monitors engine oil pressure,
coolant temperature and battery charge
etc. If controller
finds any abnor-
mality, it is dis-
played on the
LCD.
Maintenance function
Monitor informs replacement time of oil
and filters on
LCD when the
replacement
interval is
reached.
Trouble data memory function
Monitor stores abnormalities for
effective troubleshooting.
Long Greasing Interval
All bushing lubrication intervals of work
equipment except arm top bushings
are 500 hours, reducing maintenance
cost.
Option
Blade
Back fill blade can quickly and
conveniently fill trenches and clear
up jobsites.
Roadliner
Ideal performance has been
achieved with combining the mer-
its of rubber and the strengths of
steel in the new Road Liner shoes.
Additional Counter Weight
Additional weight is designed for
increased lift capacity and easy
installation.
Air Conditioner Filter
The air conditioner filter is removed
and installed without the use of tools
facilitating filter maintenance.
Equipped with the Fuel Pre-filter
(with Water Separator)
Removes water and
contaminants in the
fuel to prevent fuel
problems. (with built-in
priming pump)
Easy Access to Engine Oil Filter,
Engine Main Fuel Filter and Fuel
Drain Valve
Engine oil filter, engine main fuel filter
and fuel drain valve
are remote mount-
ed to improve
accessibility.
Side-by-side Cooling
Since radiator, aftercooler and oil cooler
are arranged in parallel, it is easy to
clean, remove and install them.
Radiator, aftercooler, and oil cooler
made of alu-
minum have
high cooling
efficiency and
are easily
recycled.
 
 





 
 

 
!
"
#
$
%
&
'
()!*
!!
!"
!, -. / 
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", 10/ .0/ 
#,  0 
$,   
%,  2
3./ . 04
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Easy Maintenance
Komatsu designed the PC78US-8 to
have easy service access. By doing so,
routine maintenance and servicing are
less likely to be skipped, which can mean
a reduction in costly downtime later on.
Here are some of the many service
features found on the PC78US-8.
Optimum Maintenance Layout
With the engine hood, right side hood
and side service doors, it is possible to
access the major maintenance points
from ground level. Furthermore, the fuel
drain valve, engine oil filter and swing
machinery oil filler are remote mounted,
facilitating easy maintenance.
Basic
operation
switches
Air conditioner
operation
switches
Function
switches
8
1 2 3
4 5 6
7
5
6
1 2 3
4
6
7
8
1
2
3
4
5
1
2
3
4
5
6
Auto-decelerator
Working mode
Travel speed
Engine water
temperature gauge
Auto-decelerator
Working mode
selector
Traveling selector
Buzzer cancel
Wiper
Windshield washer
Indicators
Basic operation
switches
Hydraulic oil
temperature gauge
Fuel gauge
Eco-gauge
Function switches
menu
COMPACT HYDRAULIC EXCAVATOR
PC78US-8 COMPACT HYDRAULIC EXCAVATOR
Internal air condi-
tioner filter
Photo : Bolt-on cutting edge type

10 11
WORKING RANGE
DIMENSIONS
BACKHOE BUCKET AND ARM COMBINATION
SPECIFICATIONS
PC78US-8
Bucket Capacity (heaped) Width Number Arm Length
SAE, PCSA CECE
Without Side With Side Weight 1650 mm 2250 mm
Cutters Cutters of Teeth 5'5" 7'5"
0.09 m30.08 m3350 mm 450 mm 145 kg 3
0.12 yd30.10 yd314" 18" 320 lb
0.12 m30.11 m3450 mm 550 mm 160 kg 3
0.16 yd30.14 yd318" 22" 355 lb
0.20 m30.18 m3550 mm 650 mm 185 kg 3
0.26 yd30.24 yd322" 26" 410 lb
0.28 m30.25 m3650 mm 750 mm 210 kg 4X
0.37 yd30.33 yd326" 30" 465 lb
0.34 m30.30 m3755 mm 210 kg 4□X
0.45 yd30.39 yd329.7" NA 465 lb
—General digging —Light-duty operation X— Not available
Shoes Operating Weight Ground Pressure
mm in kg lb kPa kg/cm2psi
With 450 17.7" 7365 16,240 33.0 0.34 4.83
blade 600 23.6" 7535 16,615 25.3 0.26 3.70
without 450 17.7" 6945 15,315 31.1 0.32 4.51
blade 600 23.6" 7115 15,690 23.9 0.24 3.47
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu SAA4D95LE-5
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Water-cooled, 4-cycle
Aspiration . . . . . . . . . . . . . . Turbocharged, and air-to-air aftercooled
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Bore x stroke . . . . . . . . . . . . . . . . . . 95 mm x 115 mm 3.74" x 4.53"
Piston displacement. . . . . . . . . . . . . . . . . . . . . . . . . . 3.26 ltr 199 in3
Governor . . . . . . . . . . . . . . . . . . . . . . . . All-speed control, electronic
Horsepower
SAE J1995 . . . . . . . . . . . . . . . . . . . . . . . . . Gross 42.8 kW 57 HP
ISO 9249 / SAE J1349 . . . . . . . . . . . . . . . . . . . Net 41 kW 55 HP
Rated rpm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1950 rpm
Fuel system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Direct injection
Lubrication system
Method . . . . . . . . . . . . . . . . . . . . . . . Gear pump, force-lubrication
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Full-flow
Air cleaner . . . . . . . . . . . . . . . . . . . . . Dry-type with double elements
. . . . . . . . . . . . . . . . . and auto dust evacuator, plus dust indicator
EPA Interim Tier 4 and EU Stage 3A emissions certified
Starting motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 kW/24 V
Alternator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 A/24 V
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Ah/2 x 12 V
HYDRAULICS SYSTEM
Type . . . . . . . . . . . . . . . . . . . . . . HydrauMind (Hydraulic Mechanical
Intelligence New Design) system,
Closed-center system with load-sensing valve
and pressure-compensated valve
Main pumps:
Type . . . . . . . . . . . . . . . . . . . . Variable displacement, axial piston
Maximum flow . . . . . . . . . . . . . . . . 160 ltr/min 42.3 U.S. gal/min
Type (for machine with blade) . . . . . . . . . Fixed displacement gear
Maximum flow . . . . . . . . . . . . . . . . . 63 ltr/min 16.6 U.S. gal/min
Hydraulic motors:
Travel . . . . . . . . . . . . . . . . . . . 2 x piston motor with parking brake
Swing . . . . . . . . . . . . . . 1 x piston motor with swing holding brake
Relief valve setting:
Implement, travel circuit . . . . . . 26.5 MPa 270 kgf/cm23,840 psi
Swing circuit. . . . . . . . . . . . . . . 20.6 MPa 210 kgf/cm22,990 psi
Blade circuit (Raise) . . . . . . . . . 12.7 MPa 130 kgf/cm21,850 psi
(Lower) . . . . . . . . 21.1 MPa 215 kgf/cm23,060 psi
Hydraulic cylinders:
(Number of cylinders – bore x stroke x rod diameter)
Boom . . . . . . . 1–115 mm x 858 mm x 65 mm 4.5" x 33.8" x 2.6"
Arm . . . . . . . . 1–100 mm x 861 mm x 60 mm 3.9" x 33.9" x 2.4"
Bucket . . . . . . 1– 90 mm x 710 mm x 55 mm 3.5" x 28.0" x 2.2"
Blade . . . . . . . 1–130 mm x 130 mm x 65 mm 5.1" x 5.1" x 2.6"
SWING SYSTEM
Driven by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic motor
Swing reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Planetary gear
Swing circle lubrication . . . . . . . . . . . . . . . . . . . . . . . Grease-bathed
Swing lock . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical disc brake
Swing speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 rpm
DRIVES AND BRAKES
Steering control . . . . . . . . . . . . . . . . . . . . . . . Two levers with pedals
Drive method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydrostatic
Maximum drawbar pull. . . . . . . . . . . . . . 66.9 kN 6820 kgf 15,050 lbf
Maximum travel speed: High . . . . . . . . . . . . . . . . . 5.0 km/h 3.1 mph
Low . . . . . . . . . . . . . . . . . 2.9 km/h 1.8 mph
Service brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic lock
Parking brake. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical disc
UNDERCARRIAGE
Center frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-frame
Track frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Box-section
Seal of track . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sealed track
Track adjuster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic
Number of shoes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 each side
Number of carrier rollers . . . . . . . . . . . . . . . . . . . . . . . . . 1 each side
Number of track rollers . . . . . . . . . . . . . . . . . . . . . . . . . . 5 each side
COOLANT AND LUBRICANT
CAPACITY (REFILLING)
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . 125 ltr 33.0 U.S. gal
Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ltr 2.6 U.S. gal
Engine. . . . . . . . . . . . . . . . . . . . . 11.5 (11.0) ltr 3.0 (2.9) U.S. gal
Final drive, each side . . . . . . . . . . . . . . . 1.1 ltr 0.3 U.S. gal
Swing drive . . . . . . . . . . . . . . . . . . . . . . . 2.0 ltr 0.5 U.S. gal
Hydraulic tank . . . . . . . . . . . . . . . . . 100 (56) ltr 26.4 (14.8) U.S. gal
OPERATING WEIGHT (APPROXIMATE)
Operating weight including 3710 mm 12'2" one-piece boom,
1650 mm 5'5" arm, SAE heaped 0.28 m30.37 yd3backhoe bucket,
blade, rated capacity of lubricants, coolant, full fuel tank, operator,
and standard equipment.
Boom Length 3710 mm 12'2" 3710 mm 12'2"
Arm Length 1650 mm 5'5" 2250 mm 7'5"
AOverall length 5770 mm 18'11" 6295 mm 20'8"
BOverall height (to top of boom)* 2555 mm 8'5" 2870 mm 9'5"
COverall width 2330 mm 7'8"
DOverall height (to top of cab)* 2730 mm 8'11"
EGround clearance, counterweight 735 mm 2'5"
FMinimum ground clearance 360 mm 1'2"
GTail swing radius 1240 mm 4'1"
HLength of track on ground 2235 mm 7'4"
ITrack length 2840 mm 9'4"
JTrack gauge 1870 mm 6'2"
KWidth of crawler 2320 mm 7'7"
LShoe width 450 mm 17.7"
MGrouser height 20 mm 0.8"
NMachine cab height 1835 mm 6'0"
OMachine cab width 2330 mm 7'8"
PDistance swing center to rear end 1405 mm 4'7"
Boom Length 3710 mm 12'2" 3710 mm 12'2"
Arm Length 1650 mm 5'5" 2250 mm 7'5"
AMaximum digging height 7300 mm 23'11" 7600 mm 24'11"
BMaximum dumping height 5180 mm 17'0" 5500 mm 18'1"
CMaximum digging depth 4100 mm 13'5" 4710 mm 15'5"
DMaximum vertical wall digging depth 3610 mm 11'10" 4030 mm 13'3"
EMaximum digging depth of cut for
2440 mm 8' level 3770 mm 12'4" 4430 mm 14'6"
FMaximum digging reach 6380 mm 20'11" 6920 mm 22'8"
GMaximum digging reach at ground 6240 mm 20'6" 6790 mm 22'3"
HMinimum digging reach at ground 1900 mm 6'3" 1735 mm 5'8"
IMinimum swing radius 1750 mm 5'9" 2050 mm 6'9"
ISO Bucket digging force 61.3 kN 61.3 kN
6250 kgf 13,780 lbf 6250 kgf 13,780 lbf
Arm crowd force 41.5 kN 34.5 kN
4230 kgf 9,330 lbf 3520 kgf 7,760 lbf
SAE Bucket digging force 53.3 kN 53.3 kN
5440 kgf 11,990 lbf 5440 kgf 11,990 lbf
Arm crowd force 38.1 kN 33.1 kN
3890 kgf 8,570 lbf 3380 kgf 7,450 lbf
87654 10
5
4
3
2
1
7
8
(m)
6
5
4
3
2
1
0
(m)
32
G.L
I
D
G
2440(8’)
F
E
C
A
B
245
9.6"
380
1’3"
H
STANDARD EQUIPMENT
●Air cleaner, double element with auto dust
evacuator
●Alternator, 35Ampere, 24V
●Automatic air conditioner
●Auto deceleration
●Batteries, 55Ah/2 x 12V
●Cab which includes: floor mat, intermittent
front windshield wiper and washer, large
ceiling hatch, pull-up front window, remov-
able lower windshield
●Cooling fan, suction type
●Monitor panel
●Rear view mirrors (LH, rear)
●Seat belt 50mm 2"
●Shoes,
—450mm 17.7" Triple grouser
●Starting motor 4.5kW
●Suspension seat
●Travel alarm
●Working lights
—1 on cab
—1 on boom
COMPACT HYDRAULIC EXCAVATOR
PC78US-8 COMPACT HYDRAULIC EXCAVATOR
G.L
J
F
B*
A
P
E
N
M
D*
H
I
G
L
K
C(O)
1170
3’10"
1395
4’7"
470
1’7"
2320 7’7"
120
4.7"
OPTIONAL EQUIPMENT
●Additional counter weight
—220 kg 485 lb
●Additional working light on cab
●Arm,
—1650mm 5'5" arm assembly
●Blade
●Boom,
—3710mm 12'2"
●Hydraulic control unit
—1 additional actuator
●Long arm,
—2250mm 7'5" arm assembly
●Reinforced blade with BOC
●Seat belt 78mm 3"
●Shoes,
—450mm 17.7" Road Liner
—600mm 23.6" Triple grouser
—450mm 17.7" Rubber shoe
*: Including grouser height