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    CAT 320D3 VS CAT 321 Excavator

    CAT 320D3
    ₹74 - 80 lakh*

    CAT 320D3

    • Weight

      19800 Kg

    • Bucket

      0.92 m³

    • Dig. Depth

      5970 mm

    • Engine

      Ashoke Leyland 134 HP

    • Warranty

      1 Year

    • Boom

      5750 mm
    Medium (15-25 Ton)
    CAT 321
    ₹75 - 85 lakh*

    CAT 321

    • Weight

      19300 kg

    • Bucket

      1.0 m³

    • Dig. Depth

      5970 mm

    • Engine

      Cat 134 HP

    • Warranty

      1 Year

    • Boom

      5700 mm
    Medium (15-25 Ton)

    Add Equipment

    The comparisons provided are based on the technical specifications published by the respective OEMs on their official websites and brochures. Please confirm these details directly with the OEMs before making any final decision.

    Key Highlights CAT 320D3CAT 321
    CAT 320D3 VS CAT 321 Excavator
    CAT Excavator 320 Price in India
    CAT 320D3

    ₹74 - 80 lakh

    CAT 321 Excavator
    CAT 321

    ₹75 - 85 lakh

    Particulars CAT 320D3 CAT 321

    CAT 320D3 vs CAT 321: Which Excavator Should You Buy?

    Both machines are 20-tonne class excavators. Both dig deep and lift well. The tables below give you all the numbers. The real question is which one fits your work and your pocket. The CAT 320D3 uses an Ashok Leyland engine and gives more hydraulic flow. More flow helps when you run heavy tools like a breaker or a rock bucket all day. The CAT 321 uses a Cat C3.6 engine. It has a slightly bigger bucket and a bigger fuel tank. So it can move a little more soil in each pass and run longer before you fill fuel again.

    Before you buy, think about a few simple things. Is there a Cat dealer and service centre near your site? Can you get an engine part fast when the machine stops? Can you pay the loan easily every month? For a contractor or a fleet, downtime costs more than a few extra HP. You can also see the full CAT excavator range and read our excavator applications guide to match the machine to your job.

    CAT 320D3 Excavator

    Pros:

    • Advanced technology and superior performance in heavy construction
    • Durable with a focus on fuel efficiency
    • Standard AC cabin and GPS

    Cons:

    • Less engine displacement compared to CAT 321
    • Lower main pump flow rate of 400 L/min
    • Bucket capacity slightly smaller than CAT 321

    CAT 321 Excavator

    Pros:

    • Versatile excavator designed for Indian construction and infrastructure conditions
    • Fuel-efficient Cat C3.6 engine with a strong digging force and smooth hydraulic response
    • Slightly larger fuel tank capacity and larger bucket capacity than CAT 320D3

    Cons:

    • Slightly higher operating weight may affect transportability
    • Higher fuel consumption rate as suggested by provided mileage
    • Engine power produced at a higher rpm than CAT 320D3

    Pros:

    Cons:

    Closing Recommendation

    Both models offer strong advantages, but for projects prioritizing slightly larger bucket capacity and a modern engine, CAT 321 might be preferable. Conversely, for those requiring a bit higher main pump flow rate, the CAT 320D3 could be the machine of choice.

    CAT 320D3 Vs CAT 321 Excavator Price, Technical Specifications & Features

    Brand Caterpillar Excavator Caterpillar Excavator
    Type Medium (15-25 Ton) Medium (15-25 Ton)
    Operating Cost ₹74 - 80 lakh ₹75 - 85 lakh
    Price ₹74 - 80 lakh ₹75 - 85 lakh
    Weight 19800 Kg 19300 kg
    Bucket 0.92 m³ 1.0 m³
    Max Digging Depth 5970 mm 5970 mm
    Engine Ashoke Leyland 134 HP Cat 134 HP
    Warranty 1 Year 1 Year
    Boom 5750 mm 5700 mm
    Quick Overview:

    The CAT 320D3 Excavator is a 20-ton hydraulic excavator designed for road construction, heavy site work, and continuous earthmoving on Indian project sites. It utilizes an Ashok Leyland ALUW06DTI engine that produces 134 HP at 1,700 rpm. This model does not have an ECM for simpler operation and better uptime. Weighing around 19,800 kg, this heavy-duty CAT excavator provides strong digging output in varying soil and rock conditions. The maximum digging depth of 5,970 mm meets most medium to heavy construction excavation needs. A bucket capacity of 0.92 m³ moves material efficiently with each pass. Electronic tandem pumps deliver 7% more flow efficiency than earlier models. Boom and stick regeneration circuits lower fuel use by up to 2% while enhancing cycle times. Economy mode reduces fuel consumption by up to 20% without sacrificing lift or digging force. A one-touch low idle function quickly adjusts engine speed to 1,000 rpm during breaks. Average fuel consumption runs between 11 and 13 litres per hour. The 350-litre tank allows for extended working hours with fewer stops. The CAT 320 excavator price in India ranges from Rs. 74 to 80 lakh. This excavator from Caterpillar Construction Equipment is a high-value option for contractors and infrastructure companies looking for low maintenance costs and strong daily output across India.

    The CAT 321 is a 21-ton hydraulic crawler excavator built for pipeline work, road foundations, and medium-scale earthmoving jobs across India. It is powered by a Cat C3.6 engine delivering 134 HP at 2,000 rpm. The electrohydraulic system works in sync with the engine, moving more material while burning less fuel per cycle. Weighing approximately 19,300 kg, this heavy-duty CAT excavator provides a stable digging platform on both firm and uneven ground. The maximum digging depth of 5,970 mm suits most foundation, trench, and utility excavation tasks. A bucket capacity of 1.0 m³ ensures steady material throughput per pass. Boom and stick regeneration circuits sharpen cycle times and lower fuel draw simultaneously. Eco mode cuts consumption further, lift and dig capacity remain fully intact. The X-structure lower frame spreads load evenly across the tracked undercarriage. Cat VisionLink telematics allow remote monitoring of fuel use, location, and maintenance alerts. The 370-litre fuel tank supports long shift operation without mid-day refuelling stops. A one-year warranty covers materials and workmanship through authorised Cat dealerships. The CAT 321 excavator price in India ranges between Rs. 75 to 85 lakh. This excavator from Caterpillar Construction Equipment is best suited for infrastructure contractors and site developers managing road, canal, and foundation projects.
    Agency review

    Planning to buy the CAT 320D3 Excavator in India? Get the best price, EMI & finance options, and delivery timelines by submitting a quick enquiry.

    Planning to buy the CAT 321 Excavator in India? Get the best price, EMI & finance options, and delivery timelines by submitting a quick enquiry.

    CAT 320D3 vs CAT 321: Which Excavator Should You Buy?

    Both machines are 20-tonne class excavators. Both dig deep and lift well. The tables below give you all the numbers. The real question is which one fits your work and your pocket. The CAT 320D3 uses an Ashok Leyland engine and gives more hydraulic flow. More flow helps when you run heavy tools like a breaker or a rock bucket all day. The CAT 321 uses a Cat C3.6 engine. It has a slightly bigger bucket and a bigger fuel tank. So it can move a little more soil in each pass and run longer before you fill fuel again.

    Before you buy, think about a few simple things. Is there a Cat dealer and service centre near your site? Can you get an engine part fast when the machine stops? Can you pay the loan easily every month? For a contractor or a fleet, downtime costs more than a few extra HP. You can also see the full CAT excavator range and read our excavator applications guide to match the machine to your job.

    CAT 320D3 Excavator

    Pros:

    • Advanced technology and superior performance in heavy construction
    • Durable with a focus on fuel efficiency
    • Standard AC cabin and GPS

    Cons:

    • Less engine displacement compared to CAT 321
    • Lower main pump flow rate of 400 L/min
    • Bucket capacity slightly smaller than CAT 321

    CAT 321 Excavator

    Pros:

    • Versatile excavator designed for Indian construction and infrastructure conditions
    • Fuel-efficient Cat C3.6 engine with a strong digging force and smooth hydraulic response
    • Slightly larger fuel tank capacity and larger bucket capacity than CAT 320D3

    Cons:

    • Slightly higher operating weight may affect transportability
    • Higher fuel consumption rate as suggested by provided mileage
    • Engine power produced at a higher rpm than CAT 320D3

    Pros:

    Cons:

    Closing Recommendation

    Both models offer strong advantages, but for projects prioritizing slightly larger bucket capacity and a modern engine, CAT 321 might be preferable. Conversely, for those requiring a bit higher main pump flow rate, the CAT 320D3 could be the machine of choice.

    CAT 320D3 Vs CAT 321 Excavator Price, Technical Specifications & Features

    CAT 320D3 CAT 321
    Brand
    Caterpillar Excavator Caterpillar Excavator
    Type
    Medium (15-25 Ton) Medium (15-25 Ton)
    Price
    ₹74 - 80 lakh ₹75 - 85 lakh
    Weight
    19800 Kg 19300 kg
    Bucket
    0.92 m³ 1.0 m³
    Max Digging Depth
    5970 mm 5970 mm
    Engine
    Ashoke Leyland 134 HP Cat 134 HP
    Warranty
    1 Year 1 Year
    Boom
    5750 mm 5700 mm
    Quick Overview:

    The CAT 320D3 Excavator is a 20-ton hydraulic excavator designed for road construction, heavy site work, and continuous earthmoving on Indian project sites. It utilizes an Ashok Leyland ALUW06DTI engine that produces 134 HP at 1,700 rpm. This model does not have an ECM for simpler operation and better uptime. Weighing around 19,800 kg, this heavy-duty CAT excavator provides strong digging output in varying soil and rock conditions. The maximum digging depth of 5,970 mm meets most medium to heavy construction excavation needs. A bucket capacity of 0.92 m³ moves material efficiently with each pass. Electronic tandem pumps deliver 7% more flow efficiency than earlier models. Boom and stick regeneration circuits lower fuel use by up to 2% while enhancing cycle times. Economy mode reduces fuel consumption by up to 20% without sacrificing lift or digging force. A one-touch low idle function quickly adjusts engine speed to 1,000 rpm during breaks. Average fuel consumption runs between 11 and 13 litres per hour. The 350-litre tank allows for extended working hours with fewer stops. The CAT 320 excavator price in India ranges from Rs. 74 to 80 lakh. This excavator from Caterpillar Construction Equipment is a high-value option for contractors and infrastructure companies looking for low maintenance costs and strong daily output across India.

    The CAT 321 is a 21-ton hydraulic crawler excavator built for pipeline work, road foundations, and medium-scale earthmoving jobs across India. It is powered by a Cat C3.6 engine delivering 134 HP at 2,000 rpm. The electrohydraulic system works in sync with the engine, moving more material while burning less fuel per cycle. Weighing approximately 19,300 kg, this heavy-duty CAT excavator provides a stable digging platform on both firm and uneven ground. The maximum digging depth of 5,970 mm suits most foundation, trench, and utility excavation tasks. A bucket capacity of 1.0 m³ ensures steady material throughput per pass. Boom and stick regeneration circuits sharpen cycle times and lower fuel draw simultaneously. Eco mode cuts consumption further, lift and dig capacity remain fully intact. The X-structure lower frame spreads load evenly across the tracked undercarriage. Cat VisionLink telematics allow remote monitoring of fuel use, location, and maintenance alerts. The 370-litre fuel tank supports long shift operation without mid-day refuelling stops. A one-year warranty covers materials and workmanship through authorised Cat dealerships. The CAT 321 excavator price in India ranges between Rs. 75 to 85 lakh. This excavator from Caterpillar Construction Equipment is best suited for infrastructure contractors and site developers managing road, canal, and foundation projects.

    CAT 320D3 Vs CAT 321 Excavator Key Highlights

    CAT 320D3 CAT 321
    Engine Make Ashoke Leyland ALUW06DTI Cat C3.6
    Fuel Tank 350 L 370 L
    Engine Displacment 5.76 L 3.6 L
    Under Carriage 4080 mm 4100 mm
    Hydraulic System 230 L 218 L
    Arm 2250 mm 2250 mm
    Max Digging Reach NA 9150 mm
    Fuel Consumption NA 14-28 L/hour
    Overall Width 2800 mm 2800 mm
    Overall Length 9520 mm 9570 mm
    Bucket Digging Force 134 kN 135 kN
    Tailswing Radius 2750 mm 2830 mm
    Track Shoe Width 600 mm 600 mm
    AC Cabin Standard Standard
    GPS Standard Standard

    CAT 320D3 Vs CAT 321 Excavator Key Highlights

    CAT 320D3 CAT 321
    Engine Make
    Ashoke Leyland ALUW06DTI Cat C3.6
    Fuel Tank
    350 L 370 L
    Engine Displacment
    5.76 L 3.6 L
    Under Carriage
    4080 mm 4100 mm
    Hydraulic System
    230 L 218 L
    Arm
    2250 mm 2250 mm
    Max Digging Reach
    NA 9150 mm
    Fuel Consumption
    NA 14-28 L/hour
    Overall Width
    2800 mm 2800 mm
    Overall Length
    9520 mm 9570 mm
    Bucket Digging Force
    134 kN 135 kN
    Tailswing Radius
    2750 mm 2830 mm
    Track Shoe Width
    600 mm 600 mm
    AC Cabin
    Standard Standard
    GPS
    Standard Standard

    CAT 320D3 Vs CAT 321 Excavator Specifications

    Engine

    3519 18182
    Model Ashoke Leyland 134 HP Cat 134 HP
    Fuel Diesel Diesel
    Type NA NA
    Rated Engine Power 134 HP (100 kW) @ 1700 rpm 134 HP (100 kW) @ 2000 rpm
    Maximum Torque NA 1969 Nm @ 1400 rpm
    Piston Displacement 5.76 L 3.6 L
    Alternator 24V NA
    Battery NA NA
    Starting Motor NA NA

    Undercarriage

    NA NA
    No of Top rollers NA NA
    No of bottom rollers NA NA
    Track Shoes (Each Side) NA NA
    Track Guard NA NA
    Track Shoe width 600 mm 600 mm
    Ground bearing pressure NA NA
    Track Tensioning Grease Grease
    Gradeability NA 35°
    Travel Speed-Low NA NA
    Travel Speed-High NA NA
    Max Tracking Force NA NA

    Hydraulic System

    CAT 320D3 CAT 321
    Hydraulic pump NA NA
    Maximum Flow 400 L/min 315 L/min
    Pilot Pump Gear Pump NA
    Implement Circuit 35.0 MPa 35 MPa
    Swing Circuit 25.0 MPa 25 MPa
    Travel circuit 35.0 MPa 35 MPa
    Pilot circuit NA NA

    Hydraulic Motors

    CAT 320D3 CAT 321
    Travel NA NA
    Swing NA NA

    Service Capacities

    CAT 320D3 CAT 321
    Fuel tank 350 L 370 L
    Engine Coolant 19 L 22 L
    Engine oil 18 L 11 L
    Hydraulic system 230 L 218 L
    Hydraulic tank 110 L 115 L

    Machine Weight

    CAT 320D3 CAT 321
    Operating Weight 19800 Kg 19300 kg

    Working Range

    CAT 320D3 CAT 321
    Boom length 5750 mm 5700 mm
    Arm length 2250 mm 2250 mm
    Max Digging Reach NA 9150 mm
    Max Digging Reach on ground 9140 mm 9150 mm
    Max digging depth 5970 mm 5970 mm
    Max digging height 9110 mm 9120 mm
    Max Dump Height 6250 mm 6250 mm
    Max vertical wallcut depth 5350 mm 5360 mm
    Min swing radius NA NA
    Max Height at Min Swing radius NA NA
    Max height (above ground) NA NA
    Dig depth (below ground) NA NA
    Bucket Digging Force 134 kN 135 kN
    Arm Digging Force 112 kN 119 kN
    Swing Speed 10 rpm 10 rpm

    Dozer Blade

    CAT 320D3 CAT 321
    Dozer Type NA NA
    Dozer Length NA NA
    Digging depth for ground level NA NA
    Approach Angle NA NA
    Width NA NA
    Height NA NA

    Bucket

    CAT 320D3 CAT 321
    Bucket Capacity 0.92 m³ 1.0 m³

    Static Dimensions

    CAT 320D3 CAT 321
    Overall Length 9520 mm 9570 mm
    Overall width 2800 mm 2800 mm
    Overall Height 3100 mm 3250 mm
    Overall Height of Cab 2915 mm 3250 mm
    Upper Width NA NA
    Track Lengh on Ground 3270 mm 3270 mm
    Undercarriage overall length 4080 mm 4100 mm
    Tailswing radius 2750 mm 2830 mm
    Min Ground clearance 450 mm 430 mm
    Track gauge 2200 mm 2200 mm
    Width over tracks NA NA
    Track Height NA NA
    Counterweight Clearance 1020 mm 1020 mm
    Track Shoe Width 600 mm 600 mm

    CAT 320D3 Vs CAT 321 Excavator Specifications

    Engine

    CAT 320D3 CAT 321
    Model
    Ashoke Leyland 134 HP Cat 134 HP
    Fuel
    Diesel Diesel
    Type
    NA NA
    Rated Engine Power
    134 HP (100 kW) @ 1700 rpm 134 HP (100 kW) @ 2000 rpm
    Maximum Torque
    NA 1969 Nm @ 1400 rpm
    Piston Displacement
    5.76 L 3.6 L
    Alternator
    24V NA
    Battery
    NA NA
    Starting Motor
    NA NA

    Undercarriage

    CAT 320D3 CAT 321
    No of Top rollers
    NA NA
    No of bottom rollers
    NA NA
    Track Shoes (Each Side)
    NA NA
    Track Guard
    NA NA
    Track Shoe width
    600 mm 600 mm
    Ground bearing pressure
    NA NA
    Track Tensioning
    Grease Grease
    Gradeability
    NA 35°
    Travel Speed-Low
    NA NA
    Travel Speed-High
    NA NA
    Max Tracking Force
    NA NA

    Hydraulic Motors

    CAT 320D3 CAT 321
    Hydraulic pump
    NA NA
    Maximum Flow
    400 L/min 315 L/min
    Pilot Pump
    Gear Pump NA
    Implement Circuit
    35.0 MPa 35 MPa
    Swing Circuit
    25.0 MPa 25 MPa
    Travel circuit
    35.0 MPa 35 MPa
    Pilot circuit
    NA NA

    Service Capacities

    CAT 320D3 CAT 321
    Fuel tank
    350 L 370 L
    Engine Coolant
    19 L 22 L
    Engine oil
    18 L 11 L
    Hydraulic system
    230 L 218 L
    Hydraulic tank
    110 L 115 L

    Machine Weight

    CAT 320D3 CAT 321
    Operating Weight
    19800 Kg 19300 kg

    Working Range

    CAT 320D3 CAT 321
    Boom length
    5750 mm 5700 mm
    Arm length
    2250 mm 2250 mm
    Max Digging Reach
    NA 9150 mm
    Max Digging Reach on ground
    9140 mm 9150 mm
    Max digging depth
    5970 mm 5970 mm
    Max digging height
    9110 mm 9120 mm
    Max Dump Height
    6250 mm 6250 mm
    Max vertical wallcut depth
    5350 mm 5360 mm
    Min swing radius
    NA NA
    Max Height at Min Swing radius
    NA NA
    Max height (above ground)
    NA NA
    Dig depth (below ground)
    NA NA
    Bucket Digging Force
    134 kN 135 kN
    Arm Digging Force
    112 kN 119 kN
    Swing Speed
    10 rpm 10 rpm

    Dozer Blade

    CAT 320D3 CAT 321
    Dozer Type
    NA NA
    Dozer Length
    NA NA
    Digging depth for ground level
    NA NA
    Approach Angle
    NA NA
    Width
    NA NA
    Height
    NA NA

    Bucket

    CAT 320D3 CAT 321
    Bucket Capacity
    0.92 m³ 1.0 m³

    Static Dimensions

    CAT 320D3 CAT 321
    Overall Length
    9520 mm 9570 mm
    Overall width
    2800 mm 2800 mm
    Overall Height
    3100 mm 3250 mm
    Overall Height of Cab
    2915 mm 3250 mm
    Upper Width
    NA NA
    Track Lengh on Ground
    3270 mm 3270 mm
    Undercarriage overall length
    4080 mm 4100 mm
    Tailswing radius
    2750 mm 2830 mm
    Min Ground clearance
    450 mm 430 mm
    Track gauge
    2200 mm 2200 mm
    Width over tracks
    NA NA
    Track Height
    NA NA
    Counterweight Clearence
    1020 mm 1020 mm
    Track Shoe Width
    600 mm 600 mm

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    Frequently Asked Question

    Ans.

    The engine and the hydraulics are the main difference. The CAT 320D3 uses an Ashok Leyland engine and gives more hydraulic flow, which suits heavy tools like breakers. The CAT 321 uses a Cat C3.6 engine and has a bigger bucket and a bigger fuel tank, which suits general digging and loading. Both are 20-tonne machines and both dig to the same depth. Pick by the work you do most days.

    Ans.

    Both are close, but each has a small edge. The CAT 321 has a bigger fuel tank, so you fill fuel less often in a long shift. The CAT 320D3 uses an Ashok Leyland engine, which many workshops in India already know well. Ask your local Cat dealer which engine parts they keep in stock. The machine that gets a part faster will lose fewer working days. For a fleet, that saved time matters more than a small fuel gap.

    Ans.

    Cat machines hold value well, so both sell without much trouble. The CAT 321 is a general-purpose digger, and general diggers have more buyers, so it can sell a little faster. The 320D3 also sells well, mostly to people who need the extra hydraulic flow for breaker work. Keep the service records and the hour meter clean. A machine with a full service history always gets a better price when you sell it later.

    Ans.

    It depends on the job mix on your sites. Choose the CAT 320D3 if your crews run breakers, rock buckets, or other heavy tools for long hours, because the higher flow keeps those tools strong. Choose the CAT 321 if your work is mostly trenching, loading trucks, and bulk earth moving, because the bigger bucket moves more in each pass. If your fleet does both, many EPC teams keep some of each and send the right machine to the right site.

    Ans.

    The 321 you see here is the current 20-tonne Cat model, and the "321D" name usually points to an older or variant unit of the same 321 line. If you want a used 321D, check the machine hours, the engine health, and the service history before you buy. New or used, the buying checks are the same. Talk to a Cat dealer so you know which exact variant you are getting and what warranty comes with it.

    Ans.

    Yes, very easily. Banks, finance companies, and Cat dealers all give loans and lease plans for these excavators. How much you pay each month depends on your down payment and your past loan record. Ask two or three lenders and compare before you sign. Do not take the first EMI offer you get.

    CAT 320D3 Vs CAT 321 - Compare Price & Availability Across 600+ Locations in India

    Compare CAT 320D3 Vs CAT 321 price and availability across all major cities in India including Mumbai, Pune, Kolkata, Hyderabad, Chennai, Bengaluru, Delhi, Ahmedabad, Indore, Jaipur, Guwahati, and 600+ more locations.

    Maharashtra
    26 cities

    • Mumbai

    • Pune

    • Nagpur

    • Navi Mumbai

    • Thane

    • Nashik

    • Aurangabad (Chhatrapati Sambhajinagar)

    • Solapur

    • Kolhapur

    • Amravati

    • Chandrapur

    • Yavatmal

    • Latur

    • Dhule

    • Ahmednagar

    • Jalgaon

    • Raigad

    • Beed

    • Wardha

    • Palghar

    • Sangli

    • Ratnagiri

    • Satara

    • Nanded

    • Akola

    • Buldhana

    Gujarat
    21 cities

    • Ahmedabad

    • Gandhinagar

    • Surat

    • Vadodara

    • Rajkot

    • Bhavnagar

    • Jamnagar

    • Mundra

    • Kutch

    • Vapi

    • Anand

    • Mehsana

    • Morbi

    • Surendranagar

    • Amreli

    • Bharuch

    • Navsari

    • Dahej

    • Alang

    • Dholera

    • Gandhidham

    Goa
    5 cities

    • Panaji

    • Vasco da Gama

    • Margao

    • Calangute

    • Mormugao

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