Cat® 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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Overview
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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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
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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
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Swing Speed
10 r/min
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Maximum Swing Torque
61 kN·m
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Operating Weight
19300 kg
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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.
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Fuel Tank Capacity
370 l -
Cooling System
25 l -
Engine Oil
11 l -
Swing Drive - Each
6 l -
Final Drive - Each
6 l -
Hydraulic System - Including Tank
218 l -
Hydraulic Tank
115 l -
Shipping Length
9570 mm -
Tail Swing Radius
2830 mm -
Counterweight Clearance
1020 mm -
Track Length
4080 mm -
Length to Center of Rollers
3270 mm -
Maximum Reach at Ground Level
9150 mm -
Maximum Cutting Height
9120 mm -
Maximum Loading Height
6250 mm -
Minimum Loading Height
2920 mm -
Maximum Vertical Wall Digging Depth
5360 mm
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Boom
Reach 5.7 m (18'8") -
Stick
Reach 2.25 m (7'5") -
Bucket
GD 1.0 m³ (1.31 yd³) -
Shipping Height - Top of Cab
3250 mm -
Handrail Height
3010 mm -
Transport Width
2800 mm
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Track Gauge
2200 mm
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Maximum Digging Depth
5970 mm
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Maximum Depth Cut for 2440 mm (8 ft) Level Bottom
5760 mm -
Bucket Digging Force - ISO
135 kN -
Stick Digging Force - ISO
119 kN
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