Komatsu D37EX-23 Bulldozer

Komatsu D37EX-23 Bulldozer

Rated rpm 2200 rpm
Operating Weight 18,695 lb 8480 kg
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Unrivaled Blade Visibility

The D37EX/PX-23 incorporates Komatsu’s super-slant nose design. Komatsu’s innovative design provides excellent blade visibility for improved machine control and increased efficiency and productivity.


New HST Technology

The D37-23 incorporates new proprietary engine and hydrostatic transmission pump control technology to improve operational efficiency and reduce fuel consumption to levels lower than a conventional HST control system can obtain. This Komatsu exclusive feature reduces fuel consumption by up to 10% in P mode in demanding working conditions and up to 20% in E mode under lighter load conditions as compared to the prior model.

Powerful turns under various work conditions are achieved with the new HST transmission, even under load. Counter-rotation is available for minimum turning radius, providing excellent maneuverability in tight spots.

Variable and New Customizable Quickshift Modes

The D37-23 offers two gearshift modes: Variable and the new Customizable Quick shift. Variable shift mode provides 20 incremental speed settings for the operator, while the new Customizable Quick shift provides 3 speed settings; all can be adjusted in the monitor to obtain the right speed for different operator preferences.

Single Pedal (Decelerator/Brake Pedal) to be operated for Speed Control, during Operation

Machine operation becomes simple because brake function has been integrated into decelerator pedal. Machine moving speed including/excluding engine speed can be controllable by using only one pedal of decelerator/brake pedal. Operation of pedal function can be changed by the mode selector switch.

Decelerator Mode

The pedal can decelerate engine RPMS and vehicle travel speed. Normally can be used for all applications.

Brake Mode

The pedal can decelerate vehicle travel speed, keeping high engine revolution. This mode can be helpful to keep work equipment controllability and/or force, even during braking.


Selectable Working Mode

Working mode E is for general dozing applications with adequate speed and power while reducing fuel consumption and CO2. Working mode P is aimed at powerful operation and maximum production. The working mode is easily switched on the monitor panel, depending on the work at hand.

E mode (Economy mode)

With E mode, the engine outputs enough power for most general dozing applications without delivering unnecessary power. This mode allows for energy saving operation and is suitable for work on ground where the machine may experience shoe slip or applications not requiring large power such as downhill dozing, leveling and light-load work.

P mode (Power mode)

With P mode, the engine outputs its full power, allowing the machine to perform large production, heavy-load, or uphill work.

Power Angle Tilt PAT Dozer With Adjustable Pitch

A Power Angle Tilt dozer blade with highly durable box-structure frame is available for the EX and PX machines. The hydraulic blade tilt and angling functions and manually adjustable blade pitch expand versatility and productivity in a variety of applications. This PAT dozer assembly is tested to stringent test standards.


Secondary Engine Shutdown Switch

A new secondary switch has been added, at the side of the front console, to shut down the engine.

ECO Guidance

In order to support optimum operation, the following 4 recommendations are displayed

to improve fuel saving operation:

    1) Avoid Excessive Engine Idling

    2) Use Economy Mode to Save Fuel

    3) Avoid Hydraulic Relief Pressure

    4) Avoid Overload

The operator can access the ECO guidance menu to check the Operation Records, Eco Guidance Records, and Average Fuel Consumption logs.

Rear View Monitoring System

On the large LCD color monitor, the operator can view, through one camera, areas directly behind the machine. This camera can be synchronized with reverse operation.

Palm Command Control System PCCS Travel Joystick

Palm command travel joystick provides the operator with a relaxed posture and superb fine control. Transmission shifting is simplified with thumb push buttons.


Electronic Controlled Hydraulic System (EPC) Blade Control Joystick

Blade control joystick uses the EPC valve and joystick, similar to the travel control joystick. EPC control combined with the highly reliable Komatsu hydraulic system enables superb fine control. A switch is now used to angle the PAT blade. A button to activate float is also provided.


Hydraulically-Driven Swing-up Fan

The D37-23 utilizes a swing-up fan with a gas strut-assisted lift locking system to provide easy access to the (side-by-side) radiator, oil cooler, and charge air cooler. The swing-up feature makes it easier to access cooling cores. The hydraulic fan can rotate in the reverse direction to help remove debris from cooler cores.


Daily Checks

All daily checks can be performed efficiently from the left side of the machine.

Modular Design

One of the design goals behind the creation of the D37 was to manufacture a more durable machine. This was achieved by reducing component complexity and using a strong modular design for increased serviceability and durability. Steel castings reduce the number of welds, improving C-frame rigidity and strength.


Robust Guarding And Attachments

Komatsu offers a full guarding package to help protect your machine and operator in severe applications.


Komatsu SAA4D95LE-6*
4-cycle, water-cooled, direct injection
Variable flow, turbocharged, air-to-air aftercooled
Number of cylinders
Bore x stroke3.75" x 4.52"95 mm x 115 mm
Piston displacement199 in³3.26 ltr
All-speed, electronic

SAE J1995 - Gross91 HP68 kW
ISO 9249 / SAE J1349 - Net89 HP66 kW
Hydraulic fan at maximum speed - Net79 HP59 kW
Rated rpm
2200 rpm
Fan drive type
Lubrication system:

Gear pump, force lubrication
*EPA Tier 4 Interim and EU stage 3B emissions certified

Hydrostatic Transmission

Dual-path, hydrostatic transmission provides infinite speed changes up to 5.3 km/h / 8.5 mph. The variable capacity travel motors allow the operator to select the optimum speed to match specific jobs. Travel control lock lever and neutral switch.

Travel speed
(quick shift mode)*
1st0–2.1 mph
0–3.4 km/h
0–2.5 mph
0–4.1 km/h
2nd0–3.5 mph
0–5.6 km/h
0–4.0 mph
0–6.5 km/h
3rd0–5.3 mph
0–8.5 km/h
0–5.3 mph
0–8.5 km/h
Travel speed
(variable mode)

0–5.3 mph
0–8.5 km/h
0–5.3 mph
0–8.5 km/h
*Quick shift speeds are adjustable in the monitor.

Final Drive

In-shoe mounted axial piston type travel motors with integrated two stage planetary gear reduction. Compact in-shoe mount reduces risk of damaged by debris. Bolt-on sprocket ring.

Steering System

Palm Command Control System (PCCS) joystick control for all directional movements. Pushing the joystick forward results in forward machine travel, while pulling it rearward reverses the machine. Simply tilt the joystick to the left or right to make a turn. Tilting the joystick fully to the left or right activates counter-rotation.

Hydrostatic Transmission (HST) provides smooth powerful turns. Fully electronic control enables smooth control that can be adjusted in the monitor. The PCCS utilizes shift buttons to increase and decrease speed.

Minimum turning radius*79"2.0 m
*As measured by track marks on the ground at pivot turn.


Rigid track frame
Track roller frame
Monocoque, large section, durable construction
Rollers and idlers
Lubricated track rollers
Lubricated tracks:
Unique seals minimize the entry of foreign abrasive material into pin to bushing clearances to provide extended service life. Track tension is easily adjusted with a grease gun.
Sealed and lubricated track
Track tension is easily adjusted with grease gun.
Tractor for inside mounted blade (PAT)

Number of track rollers (each side)
Number of carrier rollers (each side)
Type of shoes (standard)
Single grouser
Number of shoes (each side)
Grouser height1.9"47 mm
Shoe width (standard)18"460 mm
Ground contact area2,778 in²17920 cm²
Ground pressure
(with standard shoe)
6.39 psi0.45 kgf/cm² / 44.1 kPa
Track gauge5'2"1570 mm
Length of track on ground7'4"2230 mm
Link pitch6.1"154 mm

Service Refill Capacities

Coolant9.0 U.S. gal34 ltr
Fuel tank50.2 U.S. gal190 ltr
Engine oil2.9 U.S. gal11 ltr
Hydraulic tank16.9 U.S. gal64 ltr
Final drive (each side)0.9 U.S. gal3.5 ltr

Operating Weight (APROXIMATE)

Tractor weight: Including ROPS cab, U frame for power angle tilt dozer, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment.16,314 lb7400 kg
Operating weight: Operating weight: Including power angle tilt dozer, ROPS cab, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank.18,695 lb8480 kg

Hydraulic System

Closed-center Load Sensing System (CLSS) designed for precise and responsive control, and for efficient simultaneous operation.

Hydraulic control unit:

All spool control valves externally mounted remote to the hydraulic tank. Piston-type hydraulic pump with capacity (discharge flow) of 99 ltr/min / 26 U.S. gal/min at rated engine rpm.

Relief valve setting3,974 psi27.4 MPa / 280 kg/cm²
Hydraulic cylinders
Double-acting, piston type
Number of cylinders:BoreBore
Blade lift / 23.0"75 mm
Blade tilt / 13.5"90 mm
Blade angle / 23.1"80 mm
Hydraulic oil capacity (refilling):

Power angle tilt dozer15.9 U.S. gal60 ltr
Control valves:

3-spool control valve for power angle tilt dozer.


Blade lift
Raise, hold, lower, and float
Blade tilt
Right, hold, and left
Blade angle
Right, hold, and left
Additional control valve required for ripper.


Ripper lift
Raise, hold and lower

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