The D31-22 is the next addition to an all new HST dozer line based on the D51-22 design concepts. Some of these concepts include Super-slant nose, large mid-mount cab, and durable construction. 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 • Rigid track frame with in-shoe final drive • High capacity Power Angle Tilt dozer blade • Adjustable blade pitch 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 (optional) Improved Durability • Increased bushing diameter • Heavy-plate steel used throughout • Dozer frame with steel castings • Strong modular design • New heavy duty HST components Easy Maintenance • Electronic monitor panel with onboard diagnostics • Rear-mount radiator with swing-up electronically-controlled 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 SAA4D95LE-5*
Type		4-cycle, water-cooled, direct injection
Aspiration		Turbocharged, air-to-air aftercooled
Number of cylinders		4
Bore x stroke	3.74" x 4.53"	95 mm x 115 mm
Piston displacement	199 in³	3.26 ltr
Governor		All-speed, electronic
Horsepower:
SAE J1995 - Gross	80 HP	60 kW
ISO 9249 / SAE J1349 - Net	78 HP	58 kW
Hydraulic fan at maximum speed - Net	71 HP	53 kW
Rated rpm		2200 rpm
Fan drive type		Hydraulic (reversible for cleaning)
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	0–5.3 mph 0–8.5 km/h	0–5.3 mph 0–8.5 km/h
Travel speed (variable mode)	Forward	Reverse
	0–5.3 mph 0–8.5 km/h	0–5.3 mph 0–8.5 km/h

Final Drive

Minimum turning radius:	7'3"	2.2 m
As measured by track marks on the ground at pivot turn.

Steering

Minimum turning radius:	7'3"	2.2 m
As measured by track marks on the ground at pivot turn.

Undercarriage

Suspension		Rigid track frame
Track roller frame		Solid one-piece, thick steel, 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.
Number of track rollers (each side)		6
Type of shoes (standard)		Single grouser
Number of shoes (each side)		40
Grouser height	1.9"	47 mm
Shoe width (standard)	24"	600 mm
Ground contact area	4,061 in²	26200 cm²
Ground pressure (with dozer, ROPS cab)	4.69 psi	0.33 kgf/cm² / 32.3 kPa
Track gauge	5'5"	1650 mm
Length of track on ground	7'2"	2185 mm

Coolant & Lubricant Capacity (refilling)

Coolant	4.8 U.S. gal	18 ltr
Fuel tank	51.5 U.S. gal	195 ltr
Engine oil	2.9 U.S. gal	11 ltr
Hydraulic tank	15.9 U.S. gal	60 ltr
Final drive (each side)	0.9 U.S. gal	3.5 ltr

Operating Weight (APROXIMATE)

Tractor weight:		Including ROPS cab, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment.
ROPS cab	16,138 lb	7320 kg
Operating weight:		Including PAT dozer, ROPS cab, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank.
ROPS cab	18,827 lb	8540 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	2.95"	75 mm
Blade tilt / 1	3.54"	90 mm
Blade angle / 2	3.15"	80 mm
Blade pitch		1 adjustable linkage
Hydraulic oil capacity (refilling):
Power angle tilt dozer	15.9 U.S. gal	60 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
Note: Includes one additional spool for fan control.
Additional control valve required for ripper.
Positions:
Ripper lift		Raise, hold and lower