KOMATSU D71EX-24
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2024
Komastu
D71EX-24
New
Ontario
Built to offer you outstanding versatility
Versatile enough to accomplish rough dozing to grading, Komatsu’s largest hydrostatic transmission dozer H mode helps operators maintain ground speed while operating under heavy loads. Distinctive slant nose design offers operators exceptional visibility and precision on the job site.
- Can handle heavier dozing and fine grading
- Fast travel and steering response from HST drive
- PLUS helps keep maintenance costs low
Engine
| Model | Komatsu SAA6D114E-6* |
| Type | 4-cycle, water-cooled, direct injection |
| Aspiration | Komatsu Variable Geometry Turbocharged, air-to-air aftercooled, cooled EGR |
| Number of cylinders | 6 |
| Bore x stroke | 4.5 x 5.7 in |
| Piston displacement | 540 in³ |
| Governor | All-speed and mid-range, electronic |
| Horsepower: | |
| SAE J1995 - Gross | 240 HP |
| ISO 9249 / SAE J1349 - Net | 237 HP |
| Hydraulic fan at maximum speed | 213 HP |
| Rated rpm | 2,100 rpm |
| Fan drive type | Hydraulic |
| Lubrication system: | |
| Method | Gear pump, force lubrication |
| Filter | Full-flow |
| *EPA Tier 4 Final emissions certified |
Hydrostatic transmission
Dual-path, hydrostatic transmission provides extensive speed changes up to 6.8 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)* |
Forward | Reverse |
| 1st | 0-2.4 mph | 0-2.8 mph |
| 2nd | 0-4 mph | 0-4.7 mph |
| 2.5th | 0-5.2 mph | 0-5.8 mph |
| 3rd | 0-6.8 mph | 0-6.8 mph |
| Travel speed (variable mode) |
0.5-6.8 mph | 0.5-6.8 mph |
*Quick shift speeds are adjustable in the monitor
Final drive
Steering system
PCCS joystick control for all directional movements. Pushing the joystick forward results in forward machine travel, while pulling it backward 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. HST eliminates steering clutches and brakes, providing smooth, powerful turns. Fully electronic control enables smooth operation. The PCCS utilizes shift buttons to increase and decrease speed.
| Minimum turning radius | |
| D71EX-24/ D71EXi-24 | 10 ft. 2 in |
Undercarriage
Suspension
Oscillating-type with equalizer bar and pivot shafts
Track roller frame
Monocoque, large section, durable construction
Rollers and idlers
Lubricated track rollers
Lubricated tracks
Parallel Link Undercarriage System (PLUS) with lubricated rotating bushings for extended system wear life and lower maintenance costs. Track tension is adjusted easily with grease gun.
| D71EX-24/ D71EXi-24 |
|
| Number of track rollers (each side) | 8 |
| Type of shoes (standard) | Single grouser |
| Number of shoes (each side) | 45 |
| Grouser height | 2.6 in |
| Shoe width (standard) | 24 in |
| Ground contact area | 43 ft2 |
| Ground pressure (with dozer, ROPS cab) (ISO 16754) |
6.3 psi |
| Track gauge | 7 ft. 3 in |
| Length of track on ground | 10 ft. 8.9 in |
Service refill capacities
| Coolant | 14.4 US gal |
| Fuel tank | 116.0 US gal |
| Engine oil | 8.1 US gal |
| Hydraulic ta | 40.7 US gal |
| Final drive (each side) | 2.6 US gal |
| DEF tank | 5.3 US gal |
Operating weight (approximate)
Tractor weight:
Including ROPS (ISO 3471) cab, U frame for PAT dozer, rated capacity of lubricant, coolant, full fuel tank, operator and standard equipment.
| D71EXi-24 | 47,069 lbs. |
Operating weight:
Including PAT dozer, ROPS (ISO 3471) cab, operator, standard equipment, rated capacity of lubricant, coolant and full fuel tank.
| D71EX-24 | 49,824 lbs. |
| D71EXi-24 | 50,045 lbs. |
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 62.3 US gpm at rated engine rpm.
| Relief valve setting | 4,177 psi |
| Hydraulic cylinders | Double-acting, piston type |
| (Number of cylinders) | Bore |
| Blade lift (2) | 4.7 in |
| Blade tilt (1) | 5.1 in |
| Blade angle (2) | 4.3 in |
| Hydraulic oil capacity (refill): | |
| Power angle tilt dozer | 40.7 US gal |
| 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 |
- Air cleaner, double element with dust indicator
- Air suspension seat with operator presence sensing system
- Alternator, 24 V/90 A
- Backup alarm
- Batteries, 2 x 12 V/140 Ah
- Closed engine hood
- Color monitor, Liquid Crystal Display (LCD)
- Decelerator/brake pedal (Single pedal)
- Engine intake precleaner (Auto eject)
- Expansion tank
- Fuel prefilter with water separator
- High mount foot rests
- Hitch type drawbar
- Hydraulically driven cooling fan with clean mode
- Komatsu Diesel Particulate Filter (KDPF) with curved exhaust pipe
- Locks, filler caps and covers
- Radiator mask, swing up
- Rear view monitor system
- Starting motor, 11 kW/24 V
- Steering system: HST system
- Tie-offs
- Track roller guard, center and end section
- Track shoe assembly
—Parallel Link Undercarriage System (PLUS) link
24" single grouser shoe (EX)
30" single grouser shoe (PX)
36" single grouser shoe (PX wide) - Underguards:
Oil pan and hydraulic pumps
ROPS cab*
- Air conditioner (A/C)
- AUX-injack
- Cab accessories
—12 V x 2 power supply
—Cup holder
—Rear view mirror - Front pull hook
- LED lights
- Multifunction Audio
- Work lamps (Front 4, rear 2)
* Dozer assembly and rear mounted equipment are not included in base machine standard equipment
** Cab meets ROPS (ISO 3471) and FOPS (ISO 3449) Level 2 standards
- Hydraulics for ripper (EXI)
- Long drawbar
- Scoop holder
- Tool kit
- Track roller guard, full length
Multi-shank ripper (for D65EX/WX)
- Weight (including hydraulic control unit): 3,924 lb
- Beam length: 7'1"
- Maximum lift above ground: 2'1"
- Maximum digging depth: 1'11"