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Bobcat 643

Bobcat 643 specs
TypeSkid steer loader
Lift DesignRadial
Years Made1981-1986

Operating Specifications

Horsepower28.5 HP21.3 kW
Lifting Capacity (35% Tipping)720 lbs326.6 kg
Lifting Capacity (50% Tipping)1000 lbs590 kg
Operating Weight4200 lbs1905.1 kg
Tipping Load2200 lbs997.9 kg
Lift Breakout Force
Tilt Breakout Force
Max. Travel Speed6.6 mph10.6 km

Cycle Time

Raise Lift Arms3.6 sec.
Lower Lift Arms2.9 sec.
Bucket Rollback2.2 sec.
Bucket Dump2.7 sec.

Hydraulic System

Pump Flow9.5 GPM36.0 LPM
Relief Pressure1900 psi131.0 Bar
Optional FlowN/A
Hydraulic Capacity3.5 gal13.2 L
What year was the 643 Bobcat made?

Bobcat 643 was produced from 1981 to 1986.

How much can a 643 Bobcat lift?

Bobcat 643 lifts 1,000 lbs.

How heavy is a 643 Bobcat?

Bobcat 643 is 4,200 pounds.

How many horsepower is a 643 Bobcat?

Bobcat 643 has 28.5 hp.

What is the engine in the Bobcat 643?

The engine that powers the Bobcat 643 is a Kubota D1402 model.

What is the oil capacity of the Bobcat 643?

The oil capacity of the Bobcat 643 is 2.7 gallons.

Engine Specs

Rated Speed2500 RPM
Torque Power
CombustionSpherical type
Compression Ratio21.0
Firing Order1-3-4-2
Gross Power32.0 HP23.9 kW
Net Power28.5 HP21.3 kW
Displacement85 cu in.1395 cc
Bore3.3 in.8.5 cm
Stroke3.2 in.8.2 cm
Peak Torque63 ft-lb86 N∙m
Coolant Capacity2.7 gal10.4 L
Engine Oil Capacity1.7 gal6.6 L
Fuel Tank Capacity13.0 gal49.2 L


Height75.8 in.192.5 cm
Bucket Hinge Pin109.0 in.276.9 cm
Width54.0 in.137.2 cm
Length120.2 in.305.3 cm
Dump Height86.3 in.219.2 cm
Dump Reach21.8 in.55.4 cm
Ground Clearance7.5 in.19.1 cm
Dump Angle37°
Rollback Angle26°
Departure Angle28°

Tire Size


Bobcat 643 Reviews


My experience with my Bobcat 643, which I've had for nearly 5 years, has been excellent. It was barely used prior to being purchased by me from a dealer that sold business equipment. I take care of most of my own house and lawn maintenance tasks as a homeowner (including concrete work). I transport dirt around the property, dig holes for posts, etc. using the machine to excavate basements. On each of these tasks, it has done well. Ford gas engine with 32 horsepower is inside. It has the great dirt-digging ability. It also possesses the dynamism needed to push successfully. I use it to build things for and around the house.

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