- 29,057 lbs Operating Weight
- 130 @ 2200 rpm Horsepower
- 3.5 - 3.8 yd³ Blade Capacity
Introducing the Next Generation of Machine Control
Intelligent Machine Control machines have the following advantages over dozers with external grade control systems.
Automated operation from rough dozing to finish grade.
New dozing mode, load control performance features.
Standard factory installed integrated system.
- No Cables
No coiled cables between machine and blade.
- No Climbing
GNSS antenna and mast removed from blade.
- No Connections
No daily connections required between machine and blade.
Automated Blade Control, from Rough Dozing to Finish Grade. Straight to Grade.
- Blade moves to target surface until load reaches a preset level.
- The blade automatically raises to minimize track slip.
- Should the load decrease, blade will lower to re-load blade to an optimum level.
Cab Top GNSS Antenna
No blade mounted GNSS antenna(s), cables to worry about damaging with cab top GNSS antenna. Reduced risk of theft due to low visibility as viewed from ground level.
Closed-center Load Sensing Sytem CLSS Hydraulic System
With CLSS hydraulics, blade lever stroke is directly proportional to blade speed, regardless of the load and travel speed. This results in superb fine controllability.
Electronic Controlled Hydraulic System EPC Blade Control Joystick
Blade control joystick uses the EPC valve and joystick. EPC control combined with the highly reliable Komatsu hydraulic system enables superb fine control. A switch is used to angle the PAT blade. A button to activate float is also provided.
HST with Electronic Control
The D51 is equipped with a Komatsu-designed Hydrostatic Transmission (HST) that allows Quick-Shift or variable speed selection. The HST consists of dual-path closed-circuits with two variable displacement piston pumps and two variable displacement travel motors. Hydrostatic steering eliminates steering clutches and brakes, providing smooth powerful turns. Fully electronic control provides full automatic shifting and enables smooth control. Engine speed is controlled using an electronic fuel control dial.
Hydraulically-driven Swing-up Fan
The D51i-22 utilizes a swing-up fan with a gas strut-assisted lift locking system to provide easy access to the (side-by-side) radiator, oil cooler, and charge air cooler. The swing-up feature makes it easier to access cooling cores. The hydraulic fan has a “cleaning” mode. The fan rotates in the reverse direction and helps to clear off objects in front of the cooling areas. The fan is protected by thick steel louvers and an additional fan screen for added durability.
Hydrostatic Transmission (HST) Control System
The HST controller monitors engine output and work equipment/travel load. It controls HST pump and motor displacement to provide the optimum speed and drawbar pull. Power to both tracks during turns and counter-rotation makes the D51 extremely maneuverable.
Stroke Sensing Hydraulic Cylinders
Robust stroke sensing hydraulic cylinders employ proven Komatsu sensor technologies for accurate finish grade performance. Stroke sensing angle cylinder allows machine control system to know the angle of the blade.
|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|
|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)|
|Method||Gear pump, force lubrication|
*EPA Tier 3 emissions certified
Two-stage planetary gear integrated into axial piston travel motors. Compact in-shoe mount reduces risk of damage by debris. Bolt-on sprocket segments for easy replacement.
|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|
|3-spool control valve for power angle tilt dozer.|
|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.|
|Ripper lift||Raise, hold and lower|
(quick shift mode)
|Tractor weight:||Including ROPS cab, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment.|
|D51PXi-22||25,530 lb||11580 kg|
|Operating weight:||Including power angle tilt dozer, ROPS cab, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank.|
|D51PXi-22||29,057 lb||13180 kg|
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|
|Minimum turning radius:||8'7"||2.62 m|
As measured by track marks on the ground at pivot turn.
|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)||28"||710 mm|
|Ground contact area||6,042 in²||38980 cm²|
(with dozer, ROPS cab)
|4.81 psi||0.34 kgf/cm² / 33.2 kPa|
|Track gauge||6'2"||1880 mm|
|Length of track on ground||9'0"||2736 mm|
- Air cleaner, dry, double element type with caution lamp on monitor
- Decelerator pedal
- Fan, hydraulic driven, electronic control, reversible
- Water separator
- Alternator, 60 amp (24 V)
- Back-up alarm
- Batteries, large capacity 1000 CCA,170Ah
- Starting motor, 5.5 kW
- Brake pedal
- Electronically controlled Hydrostatic Transmission (HST) with Quick-shift and variable speed settings
- Track roller guards, center and end section
- Track shoe assembly w/sealed and lubricated link assembly
– D51PXi-22: 710 mm / 28" HD single grouser shoes PLUS
- Crankcase guard and underguard
- Sprocket inner guard
- 12 amp (12V) power port (cab only)
- Seat, high back, cloth, suspension type
- Cigarette lighter (24 V, cab only)
- Cup holder
- Electronic monitor panel with on-board diagnostics
- Foot rests, high mounted
- AM/FM radio
- Rearview mirror
- Power Angle Tilt dozer assembly, inside arms (3350 mm / 11' blade)
- Intelligent Machine Control
- Filler cap locks and cover locks
- KOMTRAX function Level 2+
- Lighting package - (3 front, 2 rear cab)
- Pullhook, front
- Drawbar, long type
- Track roller guard, full length
- Multi-shank ripper (for D51EXi/PXi)