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Manufacturer-sourced values side by side. No performance equivalence or ranking is applied across different machine classes.

FeatureBobcat 643Skid steerBobcat S66Skid steer
TypeSkid steerSkid steer
Lift DesignRadialVertical
Years Made1981-19862020-2022
Horsepower21.3 kW50.7 kW
Rating Operating Capacity (35% Tipping)326.6 kg—
Rating Operating Capacity (50% Tipping)590 kg1088.6 kg
Operating Weight1905.1 kg3245.0 kg
Tipping Load997.9 kg2177.2 kg
Maximum Travel Speed10.6 km11.9 km
Pump Capacity36.0 LPM66.5 LPM
Relief Valve Pressure131.0 Bar241.3 Bar
Hydraulic Tank Capacity13.2 L36.0 L
Raise Lift Arms3.6 seconds3.8 seconds
Lower Lift Arms2.9 seconds2.5 seconds
Bucket Rollback2.2 seconds1.7 seconds
Bucket Dump2.7 seconds2.3 seconds
Engine ManufacturerKubotaBobcat
Engine ModelD14022.4 L V2
Engine TypeDieselDiesel
No of Cylinders34
Rated Speed2500 RPM2600 RPM
Combustion ChamberSpherical typeDirect injection
Compression Ratio21.017.0:1
Firing Order1-3-4-21-3-4-2
Gross Power23.9 kW50.7 kW
Displacement1395 cc2401 cc
Bore8.5 cm—
Stroke8.2 cm—
Peak Torque86 N∙m266.3 N∙m
Coolant Capacity10.4 L11.3 L
Engine Oil Capacity6.6 L9.0 L
Fuel Tank Capacity49.2 L107.1 L
Cab Height192.5 cm204.5 cm
Bucket Hinge Pin Height276.9 cm304.8 cm
Width137.2 cm167.6 cm
Length with Bucket305.3 cm342.9 cm
Dump Height219.2 cm—
Dump Reach55.4 cm86.9 cm
Ground Clearance19.1 cm—
Dump Angle37 °—
Rollback Angle26 °—
Departure Angle28 °—
Front Tire7.00×15.610-16.5
Rear Tire7.00×15.610-16.5
Lift Breakout Force—2245.3 kg
Tilt Breakout Force—2449.4 kg
Optional High Speed—17.7 km
Optional Pump Capacity—101.8 LPM
Torque Speed—1800 RPM
Emissions—Tier 4
Sourceheavyequipments.net archive (imported 2026-10)heavyequipments.net archive (imported 2026-10)
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Side-by-side specification comparisons generated from the manufacturer-sourced model files. · 7,051