• 34,563 - 37,547 lbs Operating Weight
  • 97.2 @ 2050 rpm Horsepower
  • 0.34 - 1 yd¬≥ Bucket Capacity

PC138USLC-11 Mid-Size Hydraulic Excavator

Komatsu pioneered the tight tail swing design and has optimized it further with the Tier 4 Final PC138USLC-11. With this excavator you can work in one lane of traffic without disturbing the other lane. Beyond its’ tight swing capability, the PC138USLC-11 has similar digging and lifting power as most standard competitive excavators. Six working modes and efficient Komatsu engine and hydraulic technology help make the new PC138USLC-11 up to 4% more fuel efficient than the previous model.

PC138USLC-11 Walkaround  >


Tier 4 Final Engine

The Komatsu SAA4D95LE-7 engine is EPA Tier 4 Final emissions certified and provides exceptional performance while reducing fuel consumption. Based on Komatsu proprietary technologies developed over many years, this new diesel engine reduces exhaust gas particulate matter (PM) by more than 90% and nitrogen oxide (NOx) by more than 20%, compared to Tier 3 levels. Through the in-house development and production of engines, electronics, and hydraulic components, Komatsu has achieved great advancements in technology providing high levels of performance and efficiency in virtually all applications.

Komatsu Diesel Oxidation Catalyst - KDOC

The Komatsu Diesel Oxidation Catalyst (KDOC) has an integrated design that does not interfere with daily operation. This smart and simplified system removes soot using 100% "passive regeneration" without the need for a Diesel Particulate Filter. The KDOC is a simple design and does not have a scheduled service interval like a DPF and is designed for long life with no scheduled maintenance required. For owners, this means lower Owning and Operating costs due to less complexity and seamless operation.

Efficient Hydraulic System

The PC138USLC-11 uses a Closed Center Load Sensing (CLSS) hydraulic system that improves fuel efficiency and provides quick response to the operator's demands. The PC138USLC-11 also introduces new technology to enhance the engine and hydraulic pump control. This total control system matches the engine and hydraulics at the most efficient point under any load condition. There have also been improvements in the main valve and hydraulic circuit to reduce hydraulic loss, resulting in higher efficiency and up to 4% Reduction in fuel consumption compared to previous generation.

Working Mode Selection

The PC138USLC-11 excavator is equipped with six working modes (P, E, L, B, ATT/P and ATT/E). Each mode is designed to match engine speed, pump flow, and system pressure to the application. The PC138USLC-11 features a new mode (ATT/E) which allows operators to run attachments while in Economy mode.

Short Swing Radius

The versatile PC138USLC-11 can fit into areas where a conventional machine cannot. Short tail swing design and a higher boom raise angle than a standard excavator allow the machine to work in more confined areas than a conventional machine. In addition, the contoured cab design and convex sliding door allow the cab to swing within the same turning radius as the counterweight. All of the features above make the PC138USLC-11 the ideal machine for applications such as road work, underground utilities, or other applications where a conventional excavator will not fit.

Working Environment

The PC138USLC-11 features a ROPS cab which conforms ISO 12117-2, Operator Protective Guard (OPG) Level 1, and top guards (ISO 10262). The cab also contains a ground level secondary engine shut down switch. Viscous cab mounts help reduce vibration and 71 dB(A) operator sound level provides quiet operation.

Operator Environment

The PC138USLC-11 features a large cab with a wide front view and ergonomic seating position. Standard features include automatic climate control, AM/FM radio, an auxiliary input jack, 12V power ports and a rear view camera built into the monitor. To maintain a tight swing circle the cab also features a sliding door to allow for entry and exit in confined areas.

Upgraded Monitor

The updated 7” LCD color monitor features two rear view camera display modes along with large easy to read machine information displays. The monitor also features an operator ID system which captures machine operating system information by unique ID code. This system can be used to not only monitor operators but also applications and jobs etc. The monitor also displays key maintenance intervals and abnormalities.

Ease of Maintenance

Key maintenance items are grouped for easy service. The radiator and oil cooler are side-by-side with a swing out AC Condenser for good service access. The DEF fill, fuel filters, engine oil and air filter are all accessible from ground level. These features combined with Komatsu Care will provide benefits such as, increased uptime and efficiency, cost of ownership savings, and the assurance of proper maintenance with OEM Parts and Service.



Model Komatsu SAA4D95LE-7*
Type Water-cooled, 4-cycle, direct injection
Aspiration Variable flow, turbocharged, air-to-air aftercooled
Number of cylinders 4
Bore 95 mm 3.74"
Stroke 115 mm 4.53"
Piston displacement 3.26 ltr 199 in³
SAE J1995 / Gross 72.6 kW 97.3 HP
ISO 9249 / SAE J1349 / Net 72.5kW 97.2 HP
Rated rpm 2050
Fan at maximum speed /Net 67.8 kW 90.9 HP
Fan drive method for radiator cooling Mechanical with viscous clutch
Governor All-speed control, electronic
*EPA Tier 4 Final emissions certified


HydrauMind (Hydraulic Mechanical Intelligence) system,
closed-center system with load sensing valve and pressure compensated valve
Number of selectable working modes
Main pump:

Variable capacity piston type
Pumps for
Boom, arm, bucket, swing, and travel circuits
Maximum flow 242 ltr/min 64 U.S. gal/min
Hydraulic motors:

2 x piston motor with parking brake
1 x piston motor with swing holding brake
Relief valve setting:

Implement circuits 34.8 MPa / 355 kgf/cm2 5,050 psi
Travel circuit
34.8 MPa / 355 kgf/cm2 5,050 psi
Swing circuits 29.2 MPa / 298 kgf/cm² 4,240 psi
Pilot circuit 3.2 MPa / 33 kgf/cm² 470 psi
Maximum Auxiliary Flow
at 250 kgf/cm2 3,553 psi*
242 ltr/min 64 U.S. gal/min
Hydraulic cylinders / Number of cylinders: bore x stroke x rod diameter bore x stroke x rod diameter
Boom / 2 105 mm x 1055 mm x 70 mm 4.1" x 41.5" x 2.76"
Arm / 1 110 mm x 1175 mm x 75 mm 4.3" x 46.3" x 2.95"
Bucket / 1 95 mm x 885 mm x 65 mm 3.7" x 34.8" x 2.56"

Drives and Brakes

Steering control
Two levers with pedals
Drive method
Fully hydrostatic
Maximum drawbar pull 123 kN 12,500 kgf
27,560 lbf
70%, 35°
Maximum travel speed:

High 5.1 km/h 3.2 mph
Low 2.9 km/h 1.8 mph
Service brake
Hydraulic lock
Parking brake
Wet, multiple-disc

Swing System

Driven by Hydraulic motor
Swing reduction Planetary gear
Swing circle lubrication Grease-bathed
Swing lock Wet, multiple-disc brake
Swing speed 11.0 rpm
Swing torque 2991 kg.m 21,627 ft lbs


Center frame X-leg frame
Track frame Box-section
Track type Sealed track
Track adjuster Hydraulic
Number of shoes 46 each side
Number of carrier rollers 2 each side
Number of track rollers 8 each side

Sound Performance

Exterior – ISO 6395 101 dB(A)
Operator – ISO 6396 71 dB(A)

Coolant and Lubricant Capacity refilling

Fuel tank 200 ltr 52.8 U.S. gal
Coolant 17.7 ltr 4.6 U.S. gal
Engine 11.5 ltr 3.0 U.S. gal
Final drive, each side 2.1 ltr 0.55 U.S. gal
Swing drive 2.5 ltr 0.7 U.S. gal
Hydraulic tank 69 ltr 18.2 U.S. gal
DEF tank 12.6 ltr 3.3 U.S. gal

Operating Weight

Operating weight includes 4600 mm 15'1" one-piece boom, 2500 mm 8'2" arm, SAE heaped 0.51 m3 0.67 yd3 backhoe bucket, rated capacity of lubricants, coolant, full fuel tank, operator, and standard equipment.

Triple-Grouser Operating Weight Ground Pressure
500 mm
15682 kg
34,563 lb
45.29 kPa / 0.46 kg/cm2
6.57 psi
600 mm
15732 kg
35,673 lb
37.86 kPa / 0.39 kg/cm2
5.49 psi
700 mm
15932 kg
35,114 lb
32.87 kPa / 0.34 kg/cm2
4.77 psi



  • Air cleaner, double element with auto dust evacuator
  • Cooling fan, viscous type
  • Debris guards for radiator and oil cooler
  • Engine, Komatsu SAA4D95LE-7
  • Engine overheat prevention system 


  • Alternator, 24 V/60 A
  • Auto-decelerator
  • Batteries, 2 x 12 V/72 Ah
  • Electric horn
  • Starting motor 24 V/4.5 kW
  • Working light on boom
  • Working lights on cab (2)


  • Boom holding valve


  • Fan guard structure
  • Handrails
  • Pump/engine partition cover


  • Shoe, 600 mm 24" triple grouser


  • 2 x 12 V power points
  • 2 way multi-control valve
  • 24 V - 12 V power converter
  • Automatic A/C
  • Auto idle shutdown function
  • Auxiliary input jack
  • Cab includes: antenna, AM/FM radio, floor mat, intermittent front windshield wiper and washer, large ceiling hatch, pull-up front window, removable lower windshield
  • Foldable mirror (LH)
  • Large high resolution LCD monitor
  • Lock lever
  • Mirror (Rear)
  • Operator identification function
  • Operator protective top guard, OPG level 1 (ISO 10262)
  • Rear view monitor system
  • ROPS cab (ISO 12117-2)
  • Seat belt, 76 mm 3"
  • Suspension seat
  • Swing holding brake


  • Counterweight (total mass), 3460 kg 7,630 lb
  • Equipment management monitoring system
  • Pattern change valve
  • Rear reflector
  • Travel alarm



  • Hydraulic control unit - 1 additional actuator (+ 1 Hydraulics) with one and two-way flow


  • Cab guard
    — Full front guard, OPG level 1 (ISO 10262)
    — Full front guard, OPG level 2 (ISO 10262)
    — Bolt-on top guard, OPG level 2 (ISO 10262)


  • Extended track frame steps for 700 mm 28" tracks
  • Shoes
    — 500 mm 20" triple grouser
    — 700 mm 28" triple grouser
    — 500 mm 20" rubber roadliner


  • Sunvisor


  • Arms
    — 2500 mm 8'2" arm assembly
    — 2500 mm 8'2" arm assembly with piping
    — 3000 mm 9'10" arm assembly
    — 3000 mm 9'10" arm assembly with piping
  • Booms
    — 4600 mm 15'1" boom assembly
    — 4600 mm 15'1" boom assembly with piping
  • Blade
    — 2490 mm
    8'6" wide blade