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Kubota B21 Backhoe Loader
The
Kubota B21 is a four-wheel drive tractor loader backhoe. This model was
manufactured between 2001 and 2007. The components of Kubota B21 driveline
system: a 61.1 cu.in (1.0 L) Kubota D1005 3-cylinder vertical water-cooled
diesel engine, and 3-range hydrostatic transmission with infinite forward and
reverse gears.
The engine has a cylinder bore of 2.99" (76 mm), piston stroke of
2.9" (73.6 mm), and rated power of 21 hp (15.7 kW). The max forward speed - 11.1
mph (17.9 km/h), maximum reverse speed - 9.8 mph (15.8 km/h). The open center
hydraulic system used a gear pump with fluid flow rate of 7.1 gpm (27 lpm). The
hydraulic pressure is 138 bar (2000 psi). The Kubota B21 was equipped with
23x8.50-14 front tires and 12.4x16 rear tires. The wheelbase is 60.4" (1530 mm).
The TL421 loader has a maximum
lift height of 88.8" (2250 mm) at pin and bucket dump clearance of 67.2" (1700
mm). The lift capacity is 926 lbs (420 kg) at maximum height (pivot pin), and
breakout force is 1543 lbs (699 kg). The estimated cycle times are 3.0 seconds
raising to maximum height, and 1.8 seconds maximum bucket dumping. The 54"
standard material bucket has a heaped capacity of 8.1 cu.ft (0.23 m3) and weight
of 175 lbs (80 kg).
The BT751 backhoe can dig to a max depth of 91" (2335 mm),
and 2-ft flat depth of 91.7" (2320 mm). The bucket digging force is 3110 lbs
(1410 kg), and dipper stick digging force is 1748 lbs (792 kg). The overall
reach from swing pivot at ground level is 121.3" (3080 mm). The backhoe is
compatible with 12" (305 mm), 16" (405 mm), 20" (255 mm), and 24" (355 mm)
buckets.
Engine Model |
Kubota D1005 |
Engine Type |
Vertical water-cooled 4-cycle diesel |
Number of Cylinders |
3 |
Cylinder Bore, in (mm) |
2.99 (76.0) |
Piston Stroke, in (mm) |
2.90 (73.6) |
Total Displacement, cm3 (cu.in) |
1001 (61.1) |
Gross Power, kw (hp) |
21.0 (15.7) |
Rated Speed, rpm |
2600 |
Maximum Speed, rpm |
3800 |
Low Idle Speed, rpm |
900 |
Combustion Chamber |
Spherical type (E-TVCS) |
Direction of Rotation |
Counter-clockwise |
Compression Ratio |
24:1 |
Firing Order |
1-2-3 |
Fuel System |
Injection Pump |
Injection Pump Type |
Bosch MD mini |
Injection Nozzle |
Mini nozzle |
Governor Type |
Mechanical |
Lubricating System |
Forced lubrication by trochoid pump |
Oil Pressure Indicating |
Electrical type switch |
Oil Filter Type |
Full flow paper filter (cartridge type) |
Valve Clearance (Cold), in (mm) |
0.0057-0.0073 (0.15-0.19) |
Fuel Tank Capacity, gal (L) |
6.3 (24.0) |
Oil Capacity, qts (L) |
5.1 (5.3) |
Coolant Capacity, qts (L) |
3.0 (3.1) |
Electrical System Rating, Volts |
12 |
Charging Alternator |
12V, 150W |
Battery Rating |
12V, 60 AH |
PTO Operational Type |
Live |
PTO Horsepower, hp (kW) |
13.5 (10.1) |
PTO Speed, rpm |
540 |
Transmission Type |
Hydrostatic |
Number of Forward Gears |
Infinite (3-range) |
Number of Reverse Gears |
Infinite (3-range) |
Oil Capacity, qts (L) |
29.2 (27.6) |
Maximum Forward Speed, mph (kph) |
11.1 (17.9) |
Maximum Reverse Speed, mph (kph) |
9.8 (15.8) |
Drive Wheels |
4WD 4x4 |
Steering Configuration |
Front steer |
Steering System |
Hydrostatic power |
Brakes Type |
Wet disc |
Front Tire Size |
23x8.50-14 |
Rear Tire Size |
12.4-16 |
Front Tread, in (mm) |
37.8 (960) |
Rear Tread, in (mm) |
41.3 (1040) |
Hydraulic System Type |
Open center |
Implement Pump Flow, gpm (Lpm) |
7.1 (27.0) |
Steering Pump Flow, gpm (Lpm) |
1.3 (4.9) |
Hydraulic Pressure, Bar (psi) |
138 (2000) |
Fluid Capacity, gal (L) |
7.3 (27.6) |
3-Point Hitch Category |
1 |
Draft Sensing or Lift Control |
Position control |
Lift Capacity 24" (610mm) ahead pin, lb (kg) |
1017 (460) |
Wheelbase, in (mm) |
60.4 (1530) |
Height, in (mm) |
78 (1980) |
Ground Clearance, in (mm) |
12 (305) |
Turning Radius, in (mm) |
114.2 (2900) |
Weight, lb (kg) |
3990 (1810) |
Maximum Lift Height (to pin), in (mm) |
88.8 (2250) |
Dump Angle, deg |
45 |
Rollback Angle, deg |
40 |
Lift Capacity to Full Height (at Pin), lb (kg) |
926 (420) |
Breakout Force (at Pin), lb (kg) |
1543 (699) |
Bucket Width, in (mm) |
56 (1420) |
Digging Depth, in (mm) |
91 (2335) |
Digging Depth (2-ft Flat), in (mm) |
91.7 (2320) |
Reach from Swing Pivot, in (mm) |
121.3 (3080) |
Swing Arc, deg |
180 |
Bucket Digging Force, lb (kg) |
3110 (1410) |
Dipperstick Digging Force, lb (kg) |
1748 (792) |
Bucket Width, in (mm) |
16 (405) |
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Backhoe Loaders Technical Specifications |