Komatsu Crawler-Type Tractors, Komatsu Tractors

Features of Komatsu Crawler-Type Tractors

1- High Productivity

The high-power engine, highly efficient power train, large drawbar pull provided by the conventional undercarriage, and the high performance work equipment provide high productivity.

- Large capacity blade

Large capacity blade, powerful digging force, large up-and-down movement of the blade, and
high strength provided by high tensile steel.

- Uniquely designed ripper

The unique linkage design enables the ripper point to draw an ideal locus during cylinder tilting for effective excavation of embedded rocks.

- Automatic lock-up torque converter

When the lock-up clutch is engaged, the pump and the turbine are virtually connected and the
internal power loss of the torque converter is minimized. (D275AX, D375A and D475A)

- Resilient Equalized Undercarriage (REU)

This highly advanced undercarriage system utilizes an X-shape bogie structure with an
independent see-saw movement for the track rollers. This allows the shoes to always follow the contour of the ground for excellent traction. The bogies contact the track frame through rubber shock absorber reduces vibration and shock. (D155A-5, D155AX and D575A)

2- Dependable and high-performance components

- Komatsu's diesel engine delivers a strong horsepower and has a direct-injection system for
fuel savings and cleaner exhaust.

- The TORQFLOW transmission not only ensures smooth and responsive power shifting, but also
makes instant speed and directional changes by a single lever.

- The HYDROSHIFT transmission ensures not only efficient power transmitting ability for reduced fuel costs, but also a single-lever speed control and F/R directional changes for easy operation. (D21, D31-20, D37-5 and D41)

- Wet, multiple-disc type steering clutches and brakes ensure long service life and eliminate troublesome brake-lining adjustments. (D41, D65, D155A-5, D275A, D375A, D475A and
D575A)

- Double reduction final drives feature a large reduction ratio and minimize shocks to the power train components and extend the life of components. [Except D21, D31-20, D37-5 and D41]

- Lubricated track links: Since the clearance between the link pin and bushing is lubricated, wear and pitch extensions are minimized for extended service life.

- Unique dust seals prevent dust from entering into pin-to-bushing clearance for extended service.

- Floating seals in the idlers and rollers keep dirt out and lubricant in for durable operation.

- Reduction of man-hours for turning over the bushings by employment of wedge ring. (Large
Class)

- Strengthening of undercarriage by increase of press fitting width of pin. (Small-middle Class)
The most important matters for the undercarriage of a bulldozer are holding of the oil filled in the links and easiness of turning over the bushings. KOMATSU increased the rigidity and abrasion life of the links and lowered the press fitting force of the pins to reduce scuffing when the links are disassembled. As a result, the bushings are turned over extremely easily.

It's the link, the repair cost of the undercarriage of a bulldozer is the highest of all. You can reduce the repair cost with the turning over the bushings drastically.

- Modular design

The sealed, modular design allows the powertrain components to be mounted / dismounted
without any oil spillage, making servicing work clean, smooth and easy. (D41, D61, D65, D155A-5, D155AX, D275, D375A, D475A and D575A)

3- Easy operation / Operator comfort

- Operator-oriented arrangement of control levers, pedals, instruments and operator seat.

- Walk-through operator compartment provides easy boarding and exiting.

- Operator seat can be adjusted to provide the most suitable operating posture.

- Steering clutches and brakes are interconnected for easy operation.

- Low profile design assures excellent machine balance and a low center of gravity, making
machine dynamically stable and controllable, accounting for operator confidence and comfort.

- Oscillating type equalizer bar suspension absorbs vibrations and shocks for high mobility and comfortable ride even on rugged terrain. [Except D21, D31/D37/D39 and D41]

- Wrist-control-type single lever for steering/directional and speed change

All speed and directional changes, 1st to 3rd forward and reverse, and right-and left-hand
steering are controlled with just a joystick singlelever on the left. (D21, D41, D61, D65, D155A-5/D155AX and D475A )

- Blade control joystick

Blade lift, angle and tilt operations are instantly accomplished with a joystick right single-lever. The introduction of this left and right "joystick" system permits simultaneous traveling and working, offering both ease and a shorter cycle time. (D21, D31-20, D37-5, D41 and D61)

- Hydrostatic steering system (HSS)

Engine power is ideally distributed to the left and right tracks in portion to lever movement each time the machine makes a turn; the outside track moves faster and the inside slower, providing a smooth and powerful turn. (D61, D65EX/PX, D155AX and D275AX)

- Palm Command Control System

Palm Command Control System (PCCS) joystick controls 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 to make a left turn. Tilt it to the right for a right turn.
The travel speed is selected by pressing the shift button on the palm lever. (D31/D37/D39-21, D275, D375A and D575A SD)

- Centralized oil pressure inspection ports

Oil pressure check ports are centralized on the left side of the chassis to make it easier to carry out inspection and maintenance.

- Palm Command PPC Controlled Blade Control Joystick

Blade control joystick uses the PPC (Proportional Pressure Control) valve and palm command
joystick the same as travel control joystick. PPC control uses the highly reliable Komatsu
hydraulic system enabling superb fine control. (Dual tilt and pitch operation are enabled by
depressing switch with a thumb. This is available when optional dual tilt dozer is installed). (D275-5, D375A and D575A-3 SD)

4- Easy maintenance

- Bolt-on type sprocket or segmented sprocket teeth for easy in- field replacement. [Except D21]

- Simple maintenance is promoted through adoption of spin-on type fuel and full-flow filters, an air cleaner with an automatic dust evacuator, and others.

- Maintenance-free, wet, multiple-disc brakes

To ensure long life and dependability maintenance-free, wet, multiple-disc brakes are utilized. (D41, D61, D65, D155A-5/D155AX, D275A, D375A, D475A and D575A)

5- KomStat Hydrostatic Transmission

- 3-speed HST

The D31/D37/D39-21 are equipped with Komatsu’s exclusive KomStat Hydrostatic Transmission (HST) consists of dual-path and closed-circuit with two variable displacement piston pumps and two 3-speed variable displacement travel motors. The 3-speed variable capacity travel motors allow the operator to select the optimum speed to match specific jobs.

- Automatic shift between 1st and 2nd speeds

KomStat shifts automatically between 1st and 2nd speed depending on load or ground conditions to facilitate efficient operation.

- Intermediate speed selection

Enables the setting of intermediate speed in each speed range as operator desires or optimum
travel speed to match job conditions.

This means, for example, intermediate speeds of 1st speed (4.3 km/h 2.7mph), such as 3.0 km/h 1.9 mph etc., are obtained by using the newly developed PPC valve with friction disc clutch.

This contributes to increased job efficiency on fine or rough grading operation with optimum travel speed to match job conditions.

- HST dynamic brakes

KomStat uses HST dynamic brakes to ensure safe operation. Parking brake is wet, multiple-disc type with a unique drag-prevention control to keep hydraulic oil clean. (D31, D37 and D39)

- K-Bogie undercarriage system

New K-Bogie undercarriage system retains prior advantages, with new additional features.
New features on K-Bogie Undercarriage System:

1- K-bogies oscillate with two fulcrums, and track roller vertical travel is greatly increased. Impact loading on all undercarriage components has been reduced and durability
of components is improved since track rollers are always in contact with tack link.

2- Undercarriage life is improved due to better control of track chain alignment with track rollers.

3- Riding comfort is improved by reducing vibration and shock when traveling over rough terrain. (D275A, D275AX, D375A and D475A)

- Auto-shift down function

Controller monitors engine speed, travel gear and travel speed.

When load is applied and machine travel speed is reduced, the controller automatically downshifts to optimize gear speed to provide high fuel efficiency. This function provides comfortable operation and high productivity without manual downshifting. (This function can be deactivated with cancel switch). (D275, D375A and D575A SD)

- Preset travel speed selection function

Preset travel speed selection function is standard equipment, enabling the operator to select fore and aft travel speed among three preset patterns, F1-R2, F2-R2 and manual shift. When F1-R2 or F2-R2 preset pattern is selected, and travel control joystick moves from forward to reverse direction, the machine travels forward/reverse with F1/R2 or F2/R2 speed automatically. This function reduces gear shifting time during repeated round trip operations. (D275, D375A and D575A SD)