Standard Intelligent Machine Control Standard factory installed integrated 3D GNSS intelligent machine control system. Improved Machine Control Up to 9% more efficient dozer operation than comparable aftermarket machine control systems in start to finish grading tests. Factory Installed Machine Control Components Machine control components are factory installed and designed as an integral part of the base machine for improved durability. Komatsu Quality Machine control components and system validated to Komatsu’s rigorous quality & durability standards. Industry Standard Compatibility Machine control system makes use of common industry design data file norms and supports typical base station communication. Simple Operator Interface Simple touch screen control box with multi-color customizable display. 3D GNSS Machine Control Standard All on-machine components standard including control box, GNSS receiver/ radio, GNSS antenna, and enhanced inertial measurement unit sensor. Finish Grade Performance Enhanced sensor package and intelligent logic provides for finish grade accuracy in an integrated system without traditional blade mounted sensors. Stroke Sensing Hydraulic Cylinders Robust stroke sensing hydraulic cylinders employee proven Komatsu sensor technologies for accurate finish grade performance. Enhanced Inertial Measurement Unit (IMU+) Chassis mounted enhanced inertial measurement unit (IMU+) and intelligent logic provides for finish grade accuracy without blade mounted sensors. Cab Top GNSS Antenna No blade mounted GPS antennas, cables to worry about damaging with cab top GNSS antenna. Automatic Dozing From Start To Finish Load control intelligence controls blade elevation to improve productivity and minimize track slip by adjusting blade load. 1.0' from grade or 0.1' from grade – you can run in auto mode. Intelligent Dozing Mode Settings Operators are able to select between 4 distinct machine control operating modes to optimize performance to the application whether cutting, spreading, or other. Operator Selectable Load Settings Machine control load settings can be adjusted between presets to tailor response to material conditions. KOMTRAX equipped machines can send location, SMR and operation maps to a secure website utilizing wireless technology. Machines also relay error codes, cautions, maintenance items, fuel levels, and much more.

Engine

Model		Komatsu SAA6D107E-1*
Type		4-cycle, water-cooled, direct injection
Aspiration		Turbocharged, air-to-air aftercooled
Number of cylinders		6
Bore x stroke	4.21" x 4.88"	107 mm x 124 mm
Piston displacement	408 in³	6.69 ltr
Governor		All-speed, electronic
Horsepower:
SAE J1995 - Gross	133 HP	99 kW
ISO 9249 / SAE J1349 - Net	130 HP	97 kW
Hydraulic fan at maximum speed - Net	120 HP	90 kW
Rated rpm		2200 rpm
Fan drive type		Hydraulic (reversible)
Lubrication system:
Method		Gear pump, force lubrication
Filter		Full-flow
*EPA Tier 3 emissions certified

Hydrostatic Transmission

Travel speed (quick shift mode)	Forward	Reverse
1st	0–2.1 mph 0–3.4 km/h	0–2.5 mph 0–4.1 km/h
2nd	0–3.5 mph 0–5.6 km/h	0–4.0 mph 0–6.5 km/h
3rd	0–5.6 mph 0–9.0 km/h	0–5.6 mph 0–9.0 km/h
Travel speed (variable mode)	Forward	Reverse
	0–5.6 mph 0–9.0 km/h	0–5.6 mph 0–9.0 km/h

Final Drive

Minimum turning radius:	7'10"	2.39 m
As measured by track marks on the ground at pivot turn.

Steering

Minimum turning radius:	7'10"	2.39 m
As measured by track marks on the ground at pivot turn.

Undercarriage

Suspension		Oscillating equalizer bar and pivot shaft
Track roller frame		Monocoque, large section, durable construction
Rollers and idlers		Lubricated track rollers
Lubricated tracks:		Unique seals help prevent entry of foreign abrasive material into pin to bushing clearances for long service life.
Parallel Link Undercarriage System (PLUS)		Increased component size and strength, and rotating bushing design provide extended wear life and lower maintenance.
Number of track rollers (each side)		7
Type of shoes (standard)		Single grouser PLUS
Number of shoes (each side)		44
Grouser height	2.2"	56 mm
Shoe width (standard)	22"	560 mm
Ground contact area	4,752 in²	30643 cm²
Ground pressure (with dozer, ROPS cab)	5.76 psi	0.41 kgf/cm² / 39.7 kPa
Track gauge	5'10"	1790 mm
Length of track on ground	9'0"	2736 mm

Service Refill Capacities

Coolant	9.3 U.S. gal	35 ltr
Fuel tank	71.3 U.S. gal	270 ltr
Engine oil	5.3 U.S. gal	20 ltr
Hydraulic tank	16.6 U.S. gal	63 ltr
Final drive (each side)	1.1 U.S. gal	4.0 ltr

Operating Weight

Tractor weight:		Including ROPS cab, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment.
D51EX-22	24,074 lb	10920 kg
Operating weight:		Including power angle tilt dozer, ROPS cab, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank.
D51EX-22	27,381 lb	12420 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 26.2 U.S. gal/min at rated engine rpm.
Relief valve setting	3,983 psi	27.4 MPa / 280 kg/cm²
Hydraulic cylinders		Double-acting, piston type
Number of cylinders:	Bore	Bore
Blade lift / 2	3.54"	90 mm
Blade tilt / 1	3.94"	100 mm
Blade angle / 2	3.54"	90 mm
Hydraulic oil capacity (refilling):
Power angle tilt dozer	16.6 U.S. gal	63 ltr
Control valves:
3-spool control valve for power angle tilt dozer.
Positions:
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.
Positions:
Ripper lift		Raise, hold and lower