321 Hydraulic Excavator

Powered by the reliable Cat® C3.6 engine, the Cat® 321 excavator delivers high torque and fast cycle times to maximize productivity. Reinforced Cat structures extend machine life and withstand the toughest conditions, while the latest cab design puts operator safety and comfort first. Every core system undergoes rigorous testing, so you can count on consistent, reliable performance shift after shift.

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Specifications

Overview

Engine

Net Power - ISO 9249

96 kW

Net Power - ISO 9249 (DIN)

131 hp (metric)

Engine Model

Cat® C3.6

Engine Power - ISO 14396

100 kW

Engine Power - ISO 14396 (DIN)

136 hp (metric)

Bore

98 mm

Stroke

120 mm

Displacement

3.6 l

Biodiesel Capability

Up to B20¹

Emissions

Non-certified emission engine.

Note (1)

Net power advertised is the power available at the flywheel when the engine is equipped with fan, air intake system, exhaust system and alternator with engine speed at 2,000 rpm. Advertised power is tested per the specified standard in effect at the time of manufacture.

Note (2)

¹Cat® engines are compatible with diesel fuel blended with the following lower-carbon intensity fuels** up to: 100% biodiesel FAME (fatty acid methyl ester)* or 100% renewable diesel, HVO (hydrotreated vegetable oil) and GTL (gas-to-liquid) fuels. Refer to guidelines for successful application. Please consult your Cat dealer or “Caterpillar Machine Fluids Recommendations” (SEBU6250) for details. *For use of blends higher than 20% biodiesel, consult your Cat dealer. **Tailpipe greenhouse gas emissions from lower-carbon intensity fuels are essentially the same as traditional fuels.

Ground Clearance

430 mm

Hydraulic System

Main System - Maximum Flow

315 l/min (83 gal/min)

Maximum Pressure - Equipment

35000 kPa

Maximum Pressure - Travel

35000 kPa

Maximum Pressure - Swing

25000 kPa

Swing

Swing Speed

10 r/min

Swing Mechanism

Maximum Swing Torque

61 kN·m

Weights

Operating Weight

19300 kg

Turning Circle

Note

4.1 m (13'5") Standard undercarriage, 5.7 m (18'8") Reach boom, R2.25 (7'5") stick, 1.0 m3 (1.31 yd3) General Duty (GD) bucket, 600 mm (24") triple grouser track shoes and 3650 kg (8,050 lb) counterweight.