D21A-8

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Engine   
 
Model    Komatsu 4D94LE-2 
Type    Water-cooled, diesel 
Apsiration    Naturally aspirated 
Number of cylinders   
Bore  3.70"  94 mm 
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 brkes 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:     
D21A-8  6'7"  2.0 m 
D21P-8  7'7"  2.3 m 
(As measured by track marks on the ground)     
 
Final Drive   
Spur gear, single-reduction final drives. 
 
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     
D21A-8     
Number of carrier rollers (each side)   
Number of track rollers (each side)   
Number of shoes (each side)    37 
Grouser height  1.5"  39 mm 
Shoe width (standard)  11.8"  300 mm 
Ground contact area  1,570 in²  10110 cm² 
Ground pressure (tractor)  4.77 psi  32.9 kPa 0.34 kgf/cm² 
 
Operating Weight (approximate)   
Operating weight includes; power angle tilt dozer, rated capacity of lubricant, coolant, full fuel tank, standard equipment and operator 8,710 lb 3950 kg. 
Tractor weight:     
Including rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment.     
D21A-8  7,475 lb  3390 kg 
Operating weight:     
Including power angle tilt dozer, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank.     
D21A-8  8,690 lb  3940 kg 
 
Coolant & Lubricant Capacities (Refill)   
Coolant  2.6 U.S. gal  10 ltr 
Fuel tank  15.9 U.S. gal  60 ltr 
Engine  1.7 U.S. gal  6.6 ltr 
Damper case  0.2 U.S. gal  0.7 ltr 
Transmission  2.9 U.S. gal  11 ltr 
Bevel gear case  3.4 U.S. gal  13 ltr 
Final drive each side (D21A-8)  1.6 U.S. gal  6 ltr 
Hydraulic tank  5.5 U.S. gal  21 ltr 

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