340 UHD Ultra High Demolition Hydraulic Excavator



Technical Specifications
Benefits and Features

The Cat® 340 UHD provides optimum machine solutions for building demolition up to 8 stories. With its unique coupling system, you can switch between two lengths of Ultra High Demolition fronts and two types of Retrofit booms and sticks with no special tools in 15 minutes. You simply won’t find a better 50-ton class choice for demolition..

Operating Weight 121000 lb
Note (1) Hydraulic Variable Gauge undercarriage, 22 m (72'2") UHD front, 600 mm (24") Heavy Duty (HD) triple grouser shoes and 9.0 mt (19,842 lb) counterweight. No work tool.
Machine Weight - Retrofit Configuration 118600 lb
Note (2) Hydraulic Variable Gauge undercarriage, Retrofit boom, R3.2DB (10'6") stick, General Duty (GD) 2.27 m³ (2.97 yd³) bucket, 600 mm (24") HD triple grouser shoes and 9.0 mt (19,842 lb) counterweight.
UHD in Cradle 18700 lb
Retrofit Boom in Cradle - R3.9 DB Stick 13710 lb
Retrofit Boom in Cradle - R3.2 DB Stick 13340 lb
Retrofit Boom in Cradle - R2.8 DB Stick 13120 lb
2-piece Retrofit boom in cradle - R3.2 DB stick 17440 lb
Working Ranges and Forces
Maximum Pin Height at Stick Nose 72.2 ft
Maximum Weight at Stick Nose 8160 lb
Maximum Working Pin Height at Stick Nose - 1/2 61 ft
Maximum Working Reach at Stick Nose - 1/2 38.4 ft
Maximum Height at Stick Nose in Max Reach Position 41.5 ft
Maximum Reach at Stick Nose 44.4 ft
Note (1) 22 m (72' 2") UHD Front (Over-the-Front)
Engine Model Cat C9.3B
Net Power - ISO 9249 346 HP
Engine Power - ISO 14396 (DIN) 351 hp (metric)
Net Power - ISO 9249 (DIN) 352 hp (metric)
Engine Power - ISO 14396 347 HP
Bore 5 in
Stroke 6 in
Displacement 568 in³
Biodiesel Capability Up to B20¹
Emissions Meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards.
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
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
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 - Travel 5076 psi
Maximum Pressure - Swing 4264 psi
Swing Mechanism - UHD Fronts
Swing Speed 4.09 r/min
Swing Mechanism
Swing Speed 8 r/min
Maximum Swing Torque 105000 ft·lbf
Service Refill Capacities
Fuel Tank Capacity 159 gal (US)
Cooling System 11 gal (US)
Engine Oil 9 gal (US)
Swing Drive 5 gal (US)
Final Drive - Each 2 gal (US)
Hydraulic System - Including Tank 145 gal (US)
Hydraulic Tank 43 gal (US)
DEF Tank 21 gal (US)
Note (1) 22 m (72'2") UHD Front
Shipping Height - Top of Cab 11.1 ft
Cab Height - With OPG 11.8 ft
Shipping Length 49.9 ft
Tail Swing Radius 11.6 ft
Counterweight Clearance 4.6 ft
Ground Clearance 1.7 ft
Track Length 18.9 ft
Track Length to Center of Rollers 15.6 ft
Working Gauge - Extended Position 11.1 ft
Shipping Gauge - Retracted Position 7.8 ft
Transport Width 10.7 ft
Machine Length - without Front, with Counterweight 23.3 ft
Machine Length - without Front and Counterweight 22.9 ft
Track Width - Extended 13.1 ft
Track Width - Retracted 9.8 ft
Note (2) 600 mm (24") Track Shoes
Working Ranges and Forces - Retrofit Boom - Straight
Note 1 Straight - R3.2 m (10' 6") Stick (Over-the-Front) - HVG Undercarriage
Bucket GD 2.27 m³ (2.97 yd³)
Maximum Pin Height at Stick Nose 39.8 ft
Maximum Weight at Stick Nose 9260 lb
Maximum Height at Stick Nose in Max Reach Position 7.6 ft
Maximum Reach at Stick Nose 34.8 ft
Maximum Digging Depth 16.1 ft
Maximum Reach - Ground Level 39.9 ft
Maximum Loading Height 34 ft
Minimum Loading Height 15.7 ft
Bucket Digging Force - ISO 47160 lbf
Stick Digging Force - ISO 37300 lbf
Working Ranges and Forces - Retrofit Boom - Bent
Note 1 Bent - R3.2DB (10'6") Stick - HVG Undercarriage
Bucket GD 2.27 m³ (2.97 yd³)
Maximum Digging Depth 21.4 ft
Maximum Reach - Ground Level 36.7 ft
Maximum Cutting Height 35.4 ft
Maximum Loading Height 24.9 ft
Minimum Loading Height 10.4 ft
Bucket Digging Force - ISO 47160 lbf
Stick Digging Force - ISO 37300 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).



  • Cab Monitor Improvements.

  1. Continuously improved user interface allows for intuitive navigation, minimizing performance interruption with the easy-to-use touchscreen menu.

  3. Identify apps quickly with a grid list view, abbreviated app names, and categorized menu options.

  5. A notification center keeps important information visible to the operator, and displays messages without shrinking the camera view.

  7. Color coded notifications set critical messages apart from the rest.

  9. Use the in-monitor QR code to learn about machine and technology features through a full suite of “how-to” videos.

Not all features are available in all regions. Please check with your local Cat dealer for specific offering availability in your area. Build Number: 08C



  • UHD can reach up to 18.6m (60 ft 11 in) of vertical pin height, working with a 3.7 ton (8,157 lbs) tool with 11.7m (38 ft 4 in) horizontal reach.

  • Cat active stability monitoring system continuously informs operators of work tool position within the safe working range and warns when approaching the stability limit.

  • Hydraulically actuated variable gauge undercarriage provides outstanding stability extended to 4000 mm (13 ft); it retracts to 3000 mm (10 ft) to make transportation easier.

  • Standard rearview and right-hand sideview cameras give clear views on the monitor.

  • The C9.3B engine can run on biodiesel up to B20 and meets EU Stage V, U.S. EPA Tier 4 Final, and Japan 2014 emission standards.

  • Match the excavator to the job with three power modes – Power, Smart, and ECO. Smart mode automatically matches engine and hydraulic power to working requirements, providing maximum power when needed and reducing power when it isn’t to help save fuel.

  • The high-efficiency hydraulic reversing fan cools the engine on demand to help reduce fuel consumption.

  • Cat technologies increase operating efficiency to lower operator fatigue, operating costs, and fuel consumption.



  • Demolition cab with standard Operator Protective Guards (OPG) includes front and roof of P5A
    10 mm (0.4”) laminated glass.

  • Tilt-up 30° for a more productive and comfortable sight line.

  • The windshield and roof one-piece parallel wipers with three intermittent settings includes washer spray.

  • Premium heated and cooled seat is standard.

  • Get in and out of the cab easier using the tip-up left console.

  • Control the excavator comfortably with easy-to-reach controls all located in front of you.

  • Stow your gear with plenty of in-cab storage beneath and behind the seat, overhead, and in the consoles.

  • Use the standard radio’s USB ports and Bluetooth® technology to connect personal devices and make hands-free calls.



  • Start the engine with a push button; use a Bluetooth® key fob or the unique Operator ID function.

  • Program each joystick button, including power mode, response, and pattern, using Operator ID; the machine will remember what you set each time you go to work.

  • Automatic hydraulic oil warmup gets you to work faster in cold temperatures and helps prolong the life of components.

  • Navigate quickly on the high-resolution 254 mm (10 in) touchscreen monitor or with the aid of the jog dial control.

  • Make moving the excavator much easier with Cat Stick Steer. Simply push a button and use one hand to travel and turn instead of both hands or feet on levers or pedals.

  • Not sure how a function works or how to maintain the excavator? Always have the operator’s manual at your fingertips in the touchscreen monitor.



  • Standard Cat Grade with 2D with a retrofit boom indicates depth and slope on the monitor with auditory alerts.

  • Cat Payload onboard weighing helps you achieve precise load targets to improve your operating efficiency with a retrofit boom. Pick up a load of material – with either a bucket or grapple – and get a real-time weight estimate without even swinging.

  • Combine Payload with VisionLink® and remotely manage your production targets. The monitor’s USB port lets you download results from one shift all the way up to 30 days of work, so you can manage your progress without needing an internet connection or VisionLink subscription.

  • The stability monitoring system continuously informs operators of work tool position within the safe working range and warns when approaching the stability limit.

  • Know the excavator’s exact position relative to GPS and GLONASS systems. The machine automatically compensates for excavator pitch and roll caused by sloping ground conditions.

  • VisionLink provides actionable data insights for all assets - regardless of fleet size or equipment manufacturer.* Review equipment data from your desktop or mobile device to maximize uptime and optimize assets. Dashboards provide information such as hours, miles, location, idle time, and fuel utilization. Make informed decisions that lower costs, simplify maintenance, and improve safety and security on your jobsite.

  • VisionLink Productivity gathers and summarizes machine telematics and jobsite data from all your equipment – regardless of the manufacture.* View actionable information such as idle time, fuel burn, location, payload, load counts, total cycles, and more to improve machine efficiency, productivity, and utilization. Access data anywhere via a mobile, tablet, or desktop device - on or off the jobsite.

  • Remote Flash is a mobile application that allows you to update onboard software without a technician being present, allowing you to initiate software updates when convenient, increasing your overall operating efficiency.

*Data field availability can vary by equipment manufacturer.



  • Enjoy low maintenance cost due to extended service intervals.

  • Check hydraulic system oil and easily drain fuel system water and fuel tank water from ground level.

  • Track your excavator’s filter life and maintenance intervals via the in-cab monitor.

  • Change all fuel filters at a synchronized 1,000 hours. Oil and fuel filters are grouped and located on the right-hand side of the machine for easy maintenance.

  • The engine air intake filter with pre-cleaner has double the dust holding capacity of the previous air intake filter.

  • The hydraulic oil filter provides improved filtration; anti-drain valves keep oil clean when the filter is replaced.

  • Boost productivity with proactive service reminders. The Integrated vehicle health management system alerts the operator with step-by-step service guidance along with parts needed so you don't experience any unnecessary downtime.

  • S•O•SSM ports simplify maintenance and allow for quick, easy extraction of fluid samples for analysis.



  • On-board stability monitoring helps the operator enhance job safety. 

  • A travel direction indicator helps the operator know which way to activate the travel levers.

  • Enjoy greater visibility in each swing direction with the help of narrow cab pillars and large windows.

  • A ground-level shutoff switch stops all fuel to the engine when activated and shuts down the machine.

  • Rearview and right-hand sideview cameras are standard.

  • Serrated steps and an anti-skid punch plate on the service platform help prevent slipping.

  • Standard 2D E-Fence (swing) helps you avoid swinging into obstacles to the side of the machine such as live traffic and structures.



  • The Cat® C9.3B engine meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards.

  • Cat 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 (hydrogenated 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.

  • Auto Engine Speed Control helps reduce unnecessary fuel burn and greenhouse gas emissions by allowing the engine to automatically go into idle mode when the machine is not working.

  • Cat Grade technologies combine advanced guidance with optional automated machine control helping you reach grading targets while reducing fuel burn and greenhouse gas emissions by improving efficiency, job site productivity, and accuracy.

  • Cat® Payload for excavators provides on-the-go material weighing which helps reduce fuel burn by improving loading efficiency, job site productivity, and eliminating trips to the scale.

  • Cat® 2D E-fence keeps the front linkage within a predefined work area to avoid hazards such as traffic - not only helping keep personnel safe but also helps you avoid repairs, downtime, and costly job site fines.

  • Extended maintenance intervals not only reduce downtime but decrease the amount of fluid and filters that are replaced over the life of the machine.

  • Remote Flash minimizes downtime and maintenance time while keeping your asset running with maximum efficiency. Alerts for machine updates are sent virtually from your Cat dealer and updates can be deployed without a dealer technician needing to be onsite.

*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.

Standard Equipment:

  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Cab
    • Tilt-up demolition cab with P5A laminated front and roof glass
    • High-resolution 254 mm (10") LCD touchscreen monitor
    • Premium heated and cooled auto adjustable suspension seat
    • Bluetooth® integrated radio
    • Auto bi-level air conditioner
    • Jog dial and shortcut keys for monitor control
    • Keyless push-to-start engine control
    • Height-adjustable console
    • Tilt-up left-side console
    • Cat Stick Steer
    • Auxiliary relay
    • Tilt rocker switch
    • Sky wiper switch
    • LED interior lights
    • Roller front sunscreen
    • P5A fixed windshield
  • Cat Technology
    • VisionLink®
    • Remote Flash
    • Stability monitoring system
    • Electronic pitch and roll indicator
    • Travel direction indicator
    • Operator Coaching
    • Electronic joystick pattern changer
    • Cat Grade with 2D and offset memory (Retrofit boom only)
    • Cat Payload (Retrofit boom only)
  • Electrical System
    • Maintenance-free 1,000 CCA batteries (x 4)
    • Centralized electrical disconnect switch
    • LED lights
  • Engine
    • Three selectable modes: Power, Smart, ECO
    • Auto engine speed control
    • Up to 4500 m (14,760 ft) altitude capability
    • Reverse fan
    • 52° C (126° F) high-ambient cooling
    • -18° C (0° F) cold start capability
    • Double element air filter with integrated pre-cleaner
  • Hydraulic System
    • Boom lowering check valve (BLCV) for UHD front
    • Stick lower check valve (SLCV) for UHD front
    • Electronic main control valve
    • Heavy lift mode
    • Auto hydraulic oil warmup
    • Auto swing parking brake
    • High Performance hydraulic return filter
    • Two-speed travel
    • Bio hydraulic oil capability
  • Safety And Security
    • 2D E-Fence (swing)
    • Cat One Key security system
    • Lockable external tool/storage box
    • Lockable door, fuel, and hydraulic tanks
    • Lockable fuel drain compartment
    • Lockable disconnect switch
    • Service platform with anti-skid plate and recessed bolts
    • Rear and right-hand side cameras
    • Operator Protective Guards (OPG)
  • Service And Maintenance
    • Integrated vehicle health management system
    • Grouped location of engine oil and fuel filters
    • Scheduled Oil Sampling (S·O·S℠) ports
  • Undercarriage And Structures
    • 9.0 mt (19,842 lb) counterweight
    • Full-length track guiding guards
    • Travel motor guard
    • Bottom guard

Optional Equipment:

  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Booms And Sticks
    • 22 m (72'2") UHD front
    • 25 m (82'0") UHD front
    • Two-piece Retrofit Variable Adjustment boom
    • 7.4 m (24'3") Retrofit boom
    • 3.9 m (12'10") Retrofit stick
    • 3.2 m (10'6") Retrofit stick
    • 2.8 m (9'2") Retrofit stick
    • Advanced tool control, UHD
    • Cradle for UHD front parts
    • Cradle for Retrofit front parts
  • Cab
    • Roller rear sunscreen
  • Cat Technology
    • VisionLink Productivity
  • Electrical System
    • Premium surround lighting package
  • Engine
    • -32° C (-25° F) cold start capability
    • Cold start block heaters
    • Ether starting aid
  • Hydraulic System
    • SmartBoom with BLCV and Overload Warning Device for UHD front
    • Bio hydraulic oil capability
    • Combined two-way auxiliary circuits
    • High and medium-pressure auxiliary circuits
    • Quick coupler circuit
  • Safety And Security
    • 360° visibility
  • Service And Maintenance
    • QuickEvac maintenance ready
    • Electric refueling pump with auto shutoff
  • Undercarriage And Structures
    • Hydraulic Variable Gauge undercarriage
    • Fixed Gauge undercarriage
    • 600 mm (24 in) double grouser track shoes
    • 600 mm (24 in) HD triple grouser track shoes
    • 700 mm (28 in) triple grouser track shoes
    • 700 mm (28") HD triple grouser track shoes

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