Bobcat 643 Skid Steer Loader - Parts, Specs & Serial Numbers

Bobcat

SKU:: Bobcat-643-SkidSteerLoader-Specs

Fits Models:

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Part # Bobcat-643-SkidSteerLoader-Specs

Description:

The Bobcat 643 Skid Steer Loader is a versatile, mid-sized machine featuring a durable Kubota diesel engine and reliable hydrostatic transmission. Built in the late 1980s and early 1990s, the 643 was designed for serious work in agriculture, construction, and landscaping. With a 1,300 lb rated lift capacity and responsive control system, this model remains a go-to for operators who value simple maintenance, strong performance, and efficient fuel use.

Specifications & Features:

Engine: Kubota V1702-B, 4-cylinder liquid-cooled diesel
Engine Power: 32 hp @ 2,800 RPM
Hydraulic Pressure: 2,000 psi
Pump Flow: 11 GPM
Rated Operating Capacity: 1,300 lbs
Operating Weight: 4,480 lbs
Lift Type: Radial lift
Transmission: Hydrostatic drive, lever-controlled
Travel Speed: 6.6 mph
Tires: 10x16.5 standard

Common Maintenance Needs:

Hydraulic cylinder seal kits – required for lift and tilt cylinder rebuilds – Shop Bobcat 643 Hydraulic Kits
Kubota V1702 engine parts – air, oil, and fuel filters plus glow plugs – Find Kubota Engine Parts
Drive belts and tensioners – vital for cooling system reliability
Fuel system components – fuel lines and solenoids prone to wear with age

Common Issues & Quick Fixes:

Hard starts in cold weather: Replace glow plugs or check preheat circuit
Weak lift arms: Rebuild hydraulic cylinders or check for low fluid
Hydraulic leaks: Common at hose fittings and cylinder seals
Overheating: Flush radiator and inspect water pump or belt tension

Pro Tips:

Always bleed the fuel system after filter changes to prevent hard starting
Use a 50/50 mix of antifreeze and distilled water to protect the cooling system
Check hydraulic fluid level every 10 hours of use for consistent performance
Grease all pivot points frequently to avoid premature pin/bushing wear

Serial Number Location:

The serial number plate is typically found on the loader frame near the engine compartment or beneath the operator seat.

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Bobcat 643 Skid Steer Loader - Parts, Specs & Serial Numbers

Bobcat