komatsu PC138US-8 SPECIFICATIONS

OPTIONAL EQUIPMENT

● Additional counterweight
(500 kg 1,100 lb)

● Alternator, 60A

● Arm, 3000 mm 9'10"

● Arm, 2100 mm 6'11"

● Blade assembly

(Bolt-on cutting edge type)

● Blade assembly
(Welded cutting edge type)

● Hydraulic control unit
—1 additional actuator

● Rear view monitoring system

● Shoes

—

600 mm 24"

triple grouser

—

700 mm 28"

triple grouser

—

500 mm 20" rubber pad (road liner)

● Track roller guard

● Track frame undercover

● Travel motor

(Increased drawbar pull type)

PC138US-8 Shoe: 500 mm 20" Arm: 2.5 m 8'2" Unit: kg lb

A 3.0 m 10' 4.6 m 15' 6.1 m 20' Maximum

B CfCsCfCsCfCsCfCs

6.1 m *3060 *3060 *1690 *1690

20' *6,750 *6,750 *3,730 *3,730

3.0 m *5770 *5770 *4320 2990 2880 1830 *1580 1370

10' *12,720 *12,720 *9,530 6,600 6,350 4,040 *3,490 3,040

0.0 m *5630 4840 4260 2600 2690 1660 *1940 1290

0' *12,420 10,670 9,390 5,730 5,950 3,680 *4,280 2,850

–3.0 m *6040 4820 4180 2540 3000 1850

–10' *13,330 10,640 9,230 5,600 6,630 4,090

LIFTING CAPACITY

Equipment:

● Boom: 4.6 m 15'1"

● Bucket: 0.50 m30.65 yd

3

● Counterweight: 3250 kg 7,160 lb

A: Reach from swing circle
B: Bucket hook height
C: Lifting capacity

Cf: Rating over front

Cs: Rating over side

: Rating at maximum reach

PC138US-8 Shoe: 500 mm 20" Arm: 3.0 m 9'10" Unit: kg lb

A 3.0 m 10' 4.6 m 15' 6.1 m 20' Maximum

B CfCsCfCsCfCsCfCs

6.1 m *2690 *2690 *1580 *1580 *1380 *1380

20' *5,940 *5,940 *3,480 *3,480 *3,050 *3,050

3.0 m *3690 *3690 *3740 3040 2900 1850 *1280 1200

10' *8,150 *8,150 *8,250 6,700 6,390 4,080 *2,830 2,660

0.0 m *5990 4830 4240 2580 2670 1640 *1530 1120

0' *13,200 10,660 9,360 5,700 5,900 3,630 *3,370 2,480

–3.0 m *5990 4680 4100 2450 2620 1590 2510 1530

–10' *13,210 10,330 9,040 5,410 5,780 3,520 5,540 3,370

PC138US-8 Shoe: 500 mm 20" Arm: 2.1 m 6'11" Unit: kg lb

A 3.0 m 10' 4.6 m 15' 6.1 m 20' Maximum

B CfCsCfCsCfCsCfCs

6.1 m *3240 3120 *2100 *2100

20' *7,150 6,890 *4,650 *4,650

3.0 m *6480 5720 *4630 2940 2850 1810 *1950 1510

10' *14,300 12,620 *10,220 6,500 6,290 4,000 *4,310 3,340

0.0 m *5570 4800 4240 2590 2700 1670 2310 1420

0' *12,280 10,590 9,360 5,710 5,950 3,680 5,090 3,140

–3.0 m *6270 4880 4,230 2580 3500 2160

–10' *13,830 10,770 9,340 5,700 7,710 4,770

* Load is limited by hydraulic capacity rather than tipping. Ratings are based on SAE Standard No. J/ISO 10567. Rated loads do not exceed 87% of

hydraulic lift capacity or 75% of tipping load.

www.Komatsu.com

CEN00183-00 Materials and specifications are subject to change without notice.

is a trademark of Komatsu Ltd. Japan.

Printed in Japan 200612 IP.As(10)

HORSEPOWER

Gross: 72.1 kW 96.6 HP @ 2200 rpm

Net: 68.4 kW 91.7 HP @ 2200 rpm

OPERATING WEIGHT

13480– 13850 kg 29,720–30,540 lb

BUCKET CAPACITY

0.18– 0.6 m

3

0.24– 0.78 yd

3

Photo may include optional equipment.

PC138US-8

PC

138US

HYDRAULIC EXCAVATOR

Photo may include optional equipment.

2

Productivity Features

●

High Mobility

• Large drawbar pull and steering force are evident when
operating on a slope or other rough terrain.

• The machine travel speed changes automatically to Hi or
Lo at optimal points according to the travel load.

See page 5.

● High Stability

The PC138US-8 offers exceptional lifting capacity and high
stability with a large counterweight.

See page 5.

● Mode Selection

• Five working modes designed to match engine speed,
pump delivery and system pressure.

See page 5.

3

Photo may include optional equipment.

WALK-AROUND

H YDRAULIC E XCAVATOR

HYDRAULIC EXCAVATOR

PC138US-8

PC138US-8 0

HORSEPOWER

Gross: 72.1 kW 96.6 HP @ 2200 rpm

Net: 68.4 kW 91.7 HP @ 2200 rpm

OPERATING WEIGHT

13480 – 13850 kg

29,720 – 30,540 lb

BUCKET CAPACITY

0.18 – 0.6 m

3

0.24 – 0.78 yd

3

Genuine Answers for Land

and

Environment Optimization

Komatsu’s PC138US-8 Series Hydraulic Excavators have a short tail
swing profile, designed specifically for work in confined areas. By reducing tail swing, the

PC138US-8 is perfect for work on road ways, bridges, in urban areas, or anywhere space is limited. The
PC138US-8 Series provides the performance and productivity you expect from Komatsu equipment.

Ecology and Economy Features

● Low Emission Engine

A powerful turbocharged and air-to-air aftercooled Komatsu SAA4D95LE-5 provides

68.4 kW 91.7 HP. This engine is EPA Tier 3 and EU Stage 3A emissions ready,
without sacrificing power or machine productivity.

● Low Operation Noise

The dynamic noise is reduced providing low noise
operation.

See page 4.

Upper Structure Features

• Slip resistant surfaces for
improved foot traction

• Rear view monitoring system
(optional)

See page 9.

Operation Features

● Small Tail Swing

• Excellent operation in tight quarters with small tail swing radius
design

• Round profile provides short protrusion of front and rear portion of
the upper structure.

• Occupies small road width for operation on narrow roads.

See pages 6 and 7.

Larger Comfortable Cab

• Low noise cab design with
viscous cab mounting

• Sliding convex door facilitates
easy entrance in confined areas.

• Large cab improves working
space.

See page 8.

Easy Maintenance

• Long replacement interval of hydraulic oil
and hydraulic filter

• Remote mounted engine oil filter and fuel

drain valve for easy access

• Equipped with the fuel pre-filter as standard

(with water separator)

• Side-by-side cooling function enables only

the cooling unit to be attached and detached.

• Equipped with the Equipment Management

Monitoring System (EMMS) monitoring system.

See pages 10 and 11.

• Wider Working Ranges : Job sites that require a long upper
reach, such as demolition and slope cutting also benefit from
the increased digging and dumping ranges of the PC138US-8.

See page 7.

Excellent Reliability and
Durability

• High rigidity work equipment

• Sturdy frame structure

• Reliable Komatsu manufactured
major components

See page 11.

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 11.

Komatsu Technology

Komatsu develops and produces all major

components in house such as engines,

electronics and hydraulic components.

Combining “Komatsu Technology”, and

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.

4

PRODUCTIVITY & ECOLOGY FEATURES

HYDRAULIC EXCAVATOR

5

Low Emission Engine

Komatsu SAA4D95LE-5 is EPA Tier 3

and EU Stage 3A emissions ready.

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

• Highly rigid cylinder block

Low noise design

• Optimal arrangement of sound absorbing materials

• Partition between the cab and engine room

• Airtight valve room

H YDRAULIC E XCAVATOR

PC138US-8

PC138US-8

0

High Mobility

The PC138US-8 exceptional travel performance is provided

by 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.

Working Mode Application Advantage

Power mode

● Maximum production/power

P

● Fast cycle times

E

Economy ● Good cycle times

mode ● Better fuel economy

L

Lifting mode ● Suitable attachment speed

Breaker ● Optimum engine rpm,

B

mode hydraulic flow

Attachment ● Optimum engine rpm,

ATT

mode hydraulic flow, 2way

Working Modes Selectable

The PC138US-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

application. This provides the flexibility to match equipment

performance to the job at hand.

Large Digging Force

The PC138US-8 has a large bucket digging force and arm

crowd force, that facilitates digging hard rock-bed. Digging

force ISO rating.

High Stability

The PC138US-8 offers exceptional lifting capacity and high

stability with a large cast-iron counterweight that requires no

additional clearance.

*At maximum reach, ground level height and overside.

*PC120-6 measured with power max.

PC138US-8 PC120-6*

Bucket digging force 93.2 kN 93.4 kN

9500 kgf 9520 kgf

20,950 lbf 20,990 lbf

Arm crowd force 61.8 kN 63.7 kN

6300 kgf 6500 kgf

13,890 lbf 14,330 lbf

PC138US-8 PC120-6

Lifting capacity* 1290 kg 1150 kg

2,850 lb 2,500 lb

Weight of 3250 kg 2255 kg
counterweight 7,160 lb 4,960 lb

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

operation. Allows focus on operation in the green range with

reduced CO

2

emissions and efficient fuel consumption.

E

P

Fuel priority

E mode

Work priority

P mode

L

L mode

B

B mode

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.

Eco-gauge

Seven-inch TFT liquid crystal display

Hydraulic system
controller

Electronic control
unit for engine

Engine
Heavy duty HPCR
Common Rail)

(High Pressure

system

Hydraulic control valve
Flow divide/merge control
with EPC

Main pump
Single pump with double
flow system