All-around Visibility • Super-slant nose design • Cab-forward design • Integrated ROPS/FOPS (level 2) Increased Productivity • Highest HP in its class • Electronically-controlled hydraulically-driven fan • Oscillating track frame with in-shoe final drive • High capacity Power-Angle-Tilt dozer blade Easy Operation/Increased Operator Comfort • Hydrostatic Transmission (HST) with electronic control • Palm Command Control System (PCCS) • New cab damper mounting system • Large and quiet pressurized cab Improved Durability • Heavy-plate steel used throughout • Dozer frame with full steel castings • Modular design • Parallel Link Undercarriage System (PLUS) Easy Maintenance • Electronic monitor panel with onboard diagnostics • Rear-mount radiator with swing-up hydraulically-driven fan • Ground-level daily service checks • KOMTRAX^® 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 prevent entry of foreign abrasive material into pin to bushing clearances to provide extended service life. Track tension is easily adjusted with a grease gun.
Number of track rollers (each side)		7
Type of shoes (standard)		Single grouser
Number of shoes (each side)		44
Grouser height	2.1"	54 mm
Shoe width (standard)	20"	510 mm
Ground contact area	4,340 in²	28000 cm²
Ground pressure (with dozer, ROPS cab)	6.40 psi	0.45 kgf/cm² / 44.2 kPa
Track gauge	5'10"	1790 mm
Length of track on ground	9'0"	2745 mm

Coolant & Lubricant Capacity (refilling)

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 (APROXIMATE)

Tractor weight:		Including ROPS cab, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment.
D51EX-22	24,736 lb	11220 kg
Operating weight:		Including power angle tilt dozer, ROPS cab, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank.
D51EX-22	28,043 lb	12720 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