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Cat® 340 Straight Boom Excavator

Cat® 340 Straight Boom Excavator

Perfect for low-level demolition, sorting, and excavating.

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More Comfort – More Performance – More Versatility

  • Up To 15% More fuel efficiency

    Get more work done with advanced engine and electrohydraulic controls.

  • New cab with more comfort and safety

    Deluxe cab with ISO-certified ROPS protection makes for a safer, quieter work environment.

  • Up To 15% Lower maintenance costs

    Increase uptime and reduce costs with extended maintenance intervals.


Biodiesel Capability Up to B20¹
Bore 5 in
Displacement 568 in³
Emissions Meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards.
Engine Model C9.3B
Engine Power - ISO 14396 347 HP
Engine Power - ISO 14396 (DIN) 352 hp (metric)
Net Power - ISO 9249 346 HP
Net Power - ISO 9249 (DIN) 351 hp (metric)
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 1,900 rpm. Advertised power is tested per the specified standard in effect at the time of manufacture.
Note (2) ¹Cat diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) or ULSD blended with the following lower-carbon intensity fuels** up to: 20% 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. *Engines with no aftertreatment devices can use higher blends, up to 100% biodiesel (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.
Stroke 6 in

Hydraulic System

Main System - Maximum Flow 560 l/min (148 gal/min)
Maximum Pressure - Equipment 5076 psi
Maximum Pressure - Equipment - Lift Mode 5511 psi
Maximum Pressure - Swing 4264 psi
Maximum Pressure - Travel 5076 psi

Swing Mechanism

Maximum Swing Torque 10741 ft·lbf
Swing Speed 8.84 r/min


Note (1) Long undercarriage, Straight boom, R3.9DB (12'10") stick, GD 2.27 m³ (2.97 yd³) bucket, 700 mm (28") triple grouser shoes, and 9.0 mt (19,800 lb) counterweight.
Operating Weight 87800 lb

Service Refill Capacities

Cooling System 10.5 gal (US)
DEF Tank 21.1 gal (US)
Engine Oil 8.5 gal (US)
Final Drive - Each 2.1 gal (US)
Fuel Tank Capacity 158.5 gal (US)
Hydraulic System - Including Tank 98.5 gal (US)
Hydraulic Tank 42.5 gal (US)
Swing Drive 4.8 gal (US)


Boom Straight 6.9 m (22'8")
Bucket GD 2.27 m³ (2.97 yd³)
Cab Height - With OPG 11.5 ft
Counterweight Clearance 4.1 ft
Ground Clearance 1.7 ft
Shipping Height - Top of Cab 11 ft
Shipping Length 37.4 ft
Stick Reach 3.9 m (12'10")
Tail Swing Radius 11.6 ft
Track Gauge 8.5 ft
Track Length 16.5 ft
Track Length to Center of Rollers 13.3 ft
Transport Width 10.9 ft

Working Ranges and Forces

Boom Straight 6.9 m (22'8")
Bucket GD 2.27 m³ (2.97 yd³)
Bucket Digging Force -ISO 47150 lbf
Maximum Cutting Height 45.2 ft
Maximum Depth Cut for 2440 mm (8'0") Level Bottom 21.4 ft
Maximum Digging Depth 21.8 ft
Maximum Loading Height 33.6 ft
Maximum Pin Height at Stick Nose 39.4 ft
Maximum Reach at Ground Level 40.5 ft
Maximum Vertical Wall Digging Depth 18.5 ft
Maximum Weight at Stick Nose 9170 lb
Minimum Loading Height 11 ft
Stick Reach 3.9 m (12'10")
Stick Digging Force - ISO 32440 lbf

Air Conditioning System

Air Conditioning The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.0 kg (2.2 lb) of refrigerant which has a CO2 equivalent of 1.430 metric tonnes (1.576 tons).

Download resources

Demolition Excavators 330, 340, 352 SB | 340, 352 UHD - Product Brochure (Europe, N Am, Japan)
340 Straight Boom Excavator - Technical Specifications (Europe, N Am)

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