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Dozers - Komatsu Dozers - D21P-8

Earthmovers ---> Dozers Manufacturer Companies  --> Komatsu Dozers  -->  D21P-8



                                                                                                                            

Features :-  Komatsu Bull Dozers  -  D21P-8

Responsive Operation
A single joystick on the left controls all speed and directional changes including:
• 1st to 2nd
• Forward and reverse
• Right and left steering
A single joystick on the right controls all blade functions including:
• Lifting/Digging
• Angling
• Tilting
This left and right joystick system offers unparalleled control for shorter cycle times.
Easy-to-see instrument panel
Ergonomically arranged meters and lamps make it easier to check the machine condition. In addition, fuel meter and dust indicator lamp installed on the panel for easy servicing.
Walk-through operator's compartment
The operator's compartment has a complete walk-through design, making for easy getting on and off.
Efficient HYDROSHIFT transmission
The D21-8 is equipped with Komatsu's unique HYDROSHIFT transmission, assuring smooth gear shifts, powerful traction and low fuel consumption. It consists of a damper and planetary gear packs. The HYDROSHIFT transmission makes two previously incompatible factors compatible: It efficiently converts engine power to traction with minimal power loss through a damper and it offers smooth, easy shifting through a powershift transmission. Unlike ordinary powershift transmissions with torque converters, traction does not decrease, even when the engine is running at partial throttle.
Long track
The long track and well-positioned center of gravity give good machine balance and make grading operations and operations on slopes easy. In addition, the machine can travel over soft ground easily, and it can escape from muddy areas without problem.
Simplified maintenance
Spin-on type filters are used throughout the machine, making it easy to replace filter elements. Air cleaner with automatic evacuator extends cleaning interval of the air cleaner.
Automatic de-airation system with electric feed pump
Ejects air in the fuel system, simply turning on the ignition key when restarting the engine.
Single-lever steering/speed/ directional change
All the directional changes are carried out with single lever, ensuring smooth turn and superior productivity.
Fuel-efficient 4D94LE-2 engine
The Komatsu 4D94LE-2 features a direct-injection fuel system. Intake air is swirled into the combustion chamber where it is mixed with injected, atomized fuel, providing optimum combustion. This fuel system not only contributes to greater power and fuel savings, but also ensures reduced noise and cleaner exhaust. A cushion mounted engine reduces noise and vibration.



Specifications  :-  Komatsu Bull Dozers  -  D21P-8

Engine

Model

 

Komatsu 4D94LE-2

Type

 

Water-cooled, diesel

Apsiration

 

Naturally aspirated

Number of cylinders

 

4

Bore

3.70"

94mm

Stroke

4.33"

110 mm

Piston displacement

186 in³

3.053 ltr

Gross horsepower @ 2450 rpm

43.1 HP

32.2 kW

Net flywheel horsepower*

 

 

SAE J1349 @ 2450 rpm

40 HP

29.5 kW

DIN 6270 @ 2450 rpm

40 PS

29.5 kW

Net maximum torque @1300 RPM

112 lb ft

152 Nm 15.5 kg m

Governor

 

All-speed, mechanical

Filter

 

Full-flow

Direct injection fuel system. All-speed mechanical governor. Pump

 

 

*net flywheel horsepower

 

Net flywheel output for standard engine (SAE J1349) including air cleaner, alternator (not charging), water pump, lubricating oil pump, fuel pump, muffler, and fan


Hydroshift Transmission

The unique Komatsu HYDROSHIFT transmission with planetary gears is hydraulically-controlled and force-lubricated. Efficient power flow and simplified direction and speed changes (2 forward and 2 reverse).

Travel Speed 1st :

 

 

1st Forward

1.6 mph

2.6 km/h

1st Rated Drawbar Pull

7,520 lb/33.4 kN

3410 kg

1st Reverse

2.1 mph

3.3 km/h

Travel Speed 2nd:

 

 

2nd Forward

2.7 mph

4.4 km/h

2nd Rated Drawbar Pull

4,170 lb/18.5 kN

1890 kg

2nd Reverse

3.5 mph

5.6 km/h

Maximum drawbar pull:

 

 

D21A-8

9,970 lb/44.3kN

4520 kg

D21P-8

9,880 lb/43.9 kN

4480 kg


Steering


Single steering lever controls all direction movement. Dry, multipledisc steering clutches are PPC controlled and interconnected with dry, contracting-band, steering brakes to allow easy, light-touch steering/braking actions. A PPC valve built into the steering circuit facilitates smooth shockless steering control. Inching pedal assures smooth, easy starting and stopping, precise inching approaches to obstacles and impact digging.

Minimum turning radius:

 

 

D21P-8

7'7"

2.3 m

(As measured by track marks on the ground)

 

 



Undercarriage

Suspension

 

Rigid-type

Track roller frame

 

Solid,high-tensile-strength steel construction

Rollers and idlers

 

Lubricated idlers, track and carrier rollers are sealed with floating seals

Track shoes

 

Single-grouser shoes

Unique dust seals prevent entry of dust into pin-to-bushing clearances for extended service. Track tension is easily adjusted with a grease gun.

 

 

D21P-8

 

 

Number of carrier rollers (each side)

 

1

Number of track rollers (each side)

 

5

Number of shoes (each side)

 

37

Grouser height

1.5"

39 mm

Shoe width (standard)

20.0"

510 mm

Ground contact area

2,664 in²

17190 cm²

Ground pressure (tractor)

3.0 psi

20.6 kPa 0.21 kgf/cm²


Standard Equipment  :-  Komatsu Bull Dozers  -  D21P-8

Alternator, 12 V, 40 A
Back-up alarm
Batteries, 12 V, 64 Ah (5 hrs rate capacity)
Blower fan
Crankcase guard
Dry-type air cleaner with automatic dust evacuator and dust indicator lamp
Dry-type, interconnected steering clutches and brakes
Electric starting motor, 12 V, 2.3 kW
End track guiding guards
Hydraulic track adjusters
Hitch
Inching pedal
Lighting system
(including 2 front and 1 rear lights)
Lubricated track links
Power angle tilt dozer, inside arms
Muffler
ROPS canopy*
Seat belt, 76 mm 3"
Suspension seat
Shoes, 510 mm 20" single-grouser(D21A-8)
Single-lever control for blade
Single-lever steering
Transmission, F2- R2
Vandalism protection locks and filler cap locks
5-roller track frames


Optional Equipment  :-  Komatsu Bull Dozers  -  D21P-8
 
3-point hitch with swing drawbar
Air conditioner for cab
Decelerator pedal
Hydraulics for three point hitch
Perforated radiator mask
ROPS cab*
Swing drawbar
Track-roller guards, full length
*Rops cab or Rops canopy must be ordered for all machines.
D21P-8 Optional Shoes
20" 510mm circular arc shoe
*Additional weight: +176 lb +80 kg
Ground contact area: 2,664 in² 17190cm²
*Additional ground pressue (tractor): +0.07 PSI +0.5 kPa +0.005 kg/cm²
20" 500mm rubber shoe
*Additional weight: +50 lb +110 kg
Ground contact area: 2,612 in² 16850cm²
*Additional ground pressue (tractor): +0.11 PSI +0.8 kPa +0.008 kg/cm²


 

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