M320 Wheel Excavator

The Cat® M320 Wheel Excavator helps provide top performance with high swing torque to get the job done fast. With low maintenance costs, long service intervals, and 100 percent daily ground level check, the M320 helps save you time and money. A cab made for operator comfort helps keep you working quickly and efficiently.

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Specifications

Name	Type	Value	Unit Value (Imperial)	Unit Name	Unit Value (Metric)	Unit Name (Metric)
Engine Power - ISO 14396	measurement		174	hp	129	kW
Engine Power - ISO 14396 (DIN)	measurement		176	hp (metric)	176	hp (metric)
Engine Model	text	Cat C4.4

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Documents & Spec Sheets

M320 (07E) Wheel Excavator - Product Brochure (Aus-NZ, Europe, N Am, Türkiye)

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M320 (07E) Wheel Excavator - Technical Specifications (Aus-NZ, Europe, N Am, Türkiye)

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Features & Benefits

Latest Features

Cat Grade 3D Ready

The Cat Grade 3D Ready option includes all the hardware required for the Grade with 3D system, installed and tested from the factory. This option provides an easier upgrade path for customers who want to add Grade with 3D after their initial purchase. To activate, contact your Cat Dealer to purchase the required 3D software licenses. Licenses can be installed remotely or manually loaded onto the machine.

Cat Payload*

The Cat Payload option provides operators with on-the-go weighing to help them hit load targets and avoid overloading, underloading, or misloading materials.

*Payload technologies are not legal for trade.

Not all features are available in all regions. Please check with your Cat dealer for specific offering availability in your area. Build Number: 07E

High Performance

The Cat engine matches to your performance and production needs. The engine meets U.S. EPA Tier 4 Final and EU Stage V emission standards.
Easily travel between sites with travel speeds up to 35 km/h (21.7 mph).
From dirt to asphalt, the excavator matches your needs to help get the job done in a timely, efficient manner.
The advanced hydraulic system provides the optimum balance of power and efficiency while giving you the control you need for precise working requirements.
The dedicated swing pump helps provide consistent power for multitasking capabilities.
High swing torque helps you get the job done fast to move on to the next one.
Auxiliary hydraulic options give you the versatility to use a wide range of Cat attachments.
Optional bucket cylinder lowering check valves enable the machine to be used in additional applications.
Don't let the temperature stop you from working. The excavator has a standard high-ambient temperature capability up to 52°C (125°F) and cold start capability down to -18°C (0°F).

Work in Comfort

Choose between Deluxe and Premium cab options.
The Deluxe seat is heated and air adjustable while the Premium seat is heated, ventilated, and adjusts automatically.
Get in and out of the cab easily using the tip-up left console.
Advanced viscous mounts help you feel comfortable in the cab while you work with reduced cab vibrations.
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. A cup holder, bottle holder, and coat hook are also provided.
Bluetooth^® integrated radio allows for seamless mobile phone connection to listen to music, podcasts, and hands-free calling.
Easily adjust the climate control system using the touchscreen monitor or jog dial.

Low Maintenance Costs

Quickly check and service your machine with daily maintenance points accessible from ground level.
Check the engine oil level quickly and safely from the ground.
Long life filters for fuel, hydraulic oil, and air help save on maintenance costs.
Track your machine's filter life and maintenance intervals on the in-cab monitor.
The fuel filtration helps protect the engine from fuel contamination.
The hydraulic oil filter helps provide high filtration performance, anti-drain valves to help keep oil clean when the filter is replaced, and long life with a 3,000-hour replacement interval.
Centralized grease points with an autolube option mean less downtime and more work getting done.
Scheduled Oil Sampling (S•O•S^SM) ports are located at ground level, helping simplify maintenance and allowing for quick, easy extraction of fluid samples for analysis.
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.

Simple to Operate

Start the engine with the push-to-start button, a Bluetooth key fob, or the unique Operator ID function.
Program your power mode and joystick preferences using Operator ID; the excavator remembers your settings each time you go to work.
Navigate quickly on the standard high-resolution 254 mm (10 in) touchscreen monitor or with the aid of the jog dial control.
The axle locks at zero speed and unlocks when the travel pedal is activated. The axle can also be manually locked with a button on the right-hand console or with a joystick button.
Turn on Heavy Lift mode and get more force when you need it.
Continuously improved user interface allows for intuitive navigation, minimizing performance interruption with the easy-to-use touchscreen menu.
Optional Cat tiltrotators work seamlessly with Cat 2D Grade, Assist, Payload, and E-Fence with no additional hardware required. Third party tiltrotators are compatible with these features and can be activated with the purchase of additional software.

Safety Features

Access daily maintenance points from ground level.
Keep your excavator secure with Operator ID. Use your PIN code on the monitor to enable the push button starting feature.
The standard Rollover Protective Structure (ROPS) cab meets ISO 12117-2:2008 requirements.
Enjoy great all-around visibility with the help of small cab pillars, large windows, and a flat engine hood design. Rear and right-side-view cameras are standard.
The service platform design helps provide easy, safe, and quick access to the upper service platform; the service platform steps use anti-skid punch plate to help prevent slipping.
The standard hydraulic lockout lever isolates all hydraulic and travel functions in the lowered position.
The travel and swing lock prevent the front linkage and upper frame from moving as you travel.
The ground-level shutoff switch stops all fuel to the engine when activated and shuts down the machine.
Optional inspection lighting helps make service work easy and safe. With the flip of a switch, lights will illuminate the engine, pump, battery, and radiator compartments to enhance visibility.
Optional Operator Protective Guards (OPG) protect from falling and flying debris.
Optional Cab Avoidance helps you avoid contact between your worktool attachment and the cab.
Optional 2D E-fence is integrated right out of the factory to prevent the excavator from moving outside operator defined set points.

Integrated Cat® Technologies

The latest operator oriented User Interface (UI) has been designed to help maximize uptime.
VisionLink^TM 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.
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.
Remote Troubleshoot is a mobile application that allows your Cat dealer to perform diagnostic testing on your connected machine remotely to help ensure that issues are resolved quickly and with less downtime.
Optional Cat Grade with 2D system helps boost productivity versus traditional grading.
All Cat Grade systems are compatible with radios and base stations from Trimble, Topcon, and Leica. Already invested in a grade infrastructure? You can install grade systems from Trimble, Topcon, and Leica with the purchase of additional software for activation.
Optional Cat Grade with Assist helps you stay on grade – simply and effortlessly – with single-lever digging. Set your desired bucket angle and let Bucket Assist automatically maintain the angle in sloping, leveling, fine grading, and trenching applications.
Optional Cat Payload helps you achieve precise load targets to improve your operating efficiency. Pick up a load of material with a bucket and get a real-time weight estimate without swinging.

*Data field availability can vary by equipment manufacturer.

Sustainability

- The Cat C4.4 engine meets U.S. EPA Tier 4 Final and EU Stage V emission standards.
- Cat diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) and are compatible* with 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.
- Auto Engine Speed Control reduces unnecessary fuel burn and greenhouse gas emissions by allowing the engine to automatically go into idle mode when the machine is not working.
- Extended maintenance intervals not only reduce downtime but decrease the amount of fluid and filters that are replaced over the life of the machine.
- Cat Scheduled Oil Sampling (S•O•S^SM) Services helps reveal excessive wear, contaminated fluids or other “unseen” issues that can shorten component life. In many cases, you can extend oil and coolant change intervals by using fluid monitoring. Consult your Cat dealer or the machine's operation and maintenance manual for more information.
- 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.
- Remote Troubleshoot decreases maintenance time and keeps your machine running with maximum efficiency by allowing your Cat dealer to virtually test the machine while working. Once a problem is identified, a technician can fix it the first time, saving time and money.
- 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, jobsite productivity, and accuracy.
- Cat Payload for excavators provides on-the-go material weighing which helps reduce fuel burn by improving loading efficiency, jobsite productivity, and eliminating trips to the scale.
*While Caterpillar engines are compatible with these alternative fuels, some regions may not allow their use.
**Tailpipe greenhouse gas emissions from lower-carbon intensity fuels are essentially the same as traditional fuels.
***Engines with no aftertreatment devices are compatible with higher blends, up to 100% biodiesel (for use of blends higher than 20% biodiesel, consult your Cat dealer).

Attachments

M320 wheel excavator using a bucket to move dirt

Tackle your jobs with a complete Cat solution. Cat attachments are not just accessories – they are essential tools that define what your machine can do. When you pair a Cat excavator with Cat attachments, you unlock a fully integrated system built for performance, durability, and efficiency. Whether you are clearing land, breaking concrete, or compacting soil, the right attachment transforms your excavator into a powerful, multi-purpose tool ready for any challenge. Depending on your project or application, you could benefit from excavator attachments such as:

Buckets: Handle everything from digging and grading to cleanup and debris removal with your excavator. Cat offers general duty, heavy duty, extreme duty, and severe duty buckets, as well as specialized designs for ditch cleaning, rock, and finishing work. Reinforced edges and wear-resistant materials ensure long-lasting performance in tough conditions.
Demolition and Sorting Grapples: Tackle larger debris or precisely sort materials into piles. These grapples are engineered for accuracy in demolition and material sorting, handling concrete, rebar, wood, and mixed debris. High clamping force and agile movement make them ideal for primary and secondary demolition and recycling operations.
Orange Peel Grapples: Built for scrap and bulk material handling, Orange Peel Grapples excel with irregular, heavy loads like metal, rock, and waste. Their hydraulic tines provide superior grip and penetration. High-capacity and continuous rotation are perfect for scrap yards and transfer stations. Cat offers these grapples with a choice of different shell designs and tine options suited to various applications.
Hammers: Break concrete, rock, and steel with up to 1,000 blows per minute. Built for high-production demolition, quarrying, and construction, they offer powerful impact energy and consistent performance. Their durability and low-maintenance design make them essential for demanding breaking applications.
Multi-Processors: A versatile tool for demolition, equipped with interchangeable jaws to handle concrete, steel, and rebar. Multi-Processors combine cutting, crushing and pulverizing capabilities in one attachment. Their modular design maximizes efficiency across a range of job site demands.
Tiltrotators: Tiltrotators provide 360° rotation and 40° left/right tilt functionality, allowing attachments to move with unmatched precision and flexibility. This flexibility transforms your machine into a multi-functional tool capable of working from virtually any angle without repositioning. Ideal for grading, trenching, and complex excavation work, they deliver multi-angle control for tight and confined spaces.

Cat attachments are engineered to maximize your excavator’s productivity, helping you get more work done with greater efficiency and confidence. Choosing the right attachment is not just about compatibility, it is about unlocking your machine’s full potential while avoiding equipment damage or safety risks. Connect with your Cat Dealer to find the optimal attachments for your specific machine and application needs.

Complete Specifications

Engine

Name	Type	Value	Unit Value (Imperial)	Unit Name	Unit Value (Metric)	Unit Name (Metric)
Engine Power - ISO 14396	measurement		174	hp	129	kW
Engine Power - ISO 14396 (DIN)	measurement		176	hp (metric)	176	hp (metric)
Engine Model	text	Cat C4.4
Net Power - ISO 9249	measurement		171	hp	127.8	kW
Net Power - ISO 9249 (DIN)	measurement		174	hp (metric)	174	hp (metric)
Bore	measurement		4.1	in	105	mm
Stroke	measurement		5.3	in	135	mm
Displacement	measurement		268.5	in³	4.4	l
Biodiesel Capability	text	Up to B20¹
Emissions	text	Meets U.S. EPA Tier 4 Final and EU Stage V emission standards.
Note (1)	text	Net power advertised is the power available at the flywheel when the engine is equipped with fan, air cleaner, Clean Emission Module (CEM) exhaust gas aftertreatment, alternator, and cooling fan running at intermediate speed. Rated speed at 2,200 rpm. Advertised power is tested per the specified standard in effect at the time of manufacture.
Note (2)	text	¹Cat diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) and are compatible* with 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. While Caterpillar engines are compatible with these alternative fuels, some regions may not allow their use. Tailpipe greenhouse gas emissions from lower-carbon intensity fuels are essentially the same as traditional fuels. **Engines with no aftertreatment devices are compatible with higher blends, up to 100% biodiesel (for use of blends higher than 20% biodiesel, consult your Cat dealer).
Maximum Travel Speed	measurement		21.7	mile/h	35	km/h
Main System - Maximum Flow - Implement	measurement		81	gpm	306	L/min
Maximum Pressure - Implement Circuit - Normal	measurement		5076	psi	35000	kPa
Maximum Pressure - Implement Circuit - Heavy Lift	measurement		5366	psi	37000	kPa
Maximum Pressure - Implement Circuit - Travel Circuit	measurement		5076	psi	35000	kPa
Maximum Swing Speed*	measurement		9.2	r/min	9.2	r/min
Maximum Swing Torque	measurement		38,722	lbf·ft	52.5	kN·m
Note (1)	text	*For CE-marked machine default value may be set lower
Operating Weight Maximum	measurement		46740	lb	21200	kg
Operating Weight Minimum	measurement		41450	lb	18800	kg
Note (1)	text	Operating weight includes full fuel tank, operator, bucket 700 kg (1,543 lb) and dual pneumatic tires. Weight varies depending on configuration. Typical configurations include 2500 mm (8'2") stick, 3600 kg (7,937 lb) counterweight, bucket and 220 kg (485 lb) quick coupler.
Fuel Tank	measurement		124.2	gal (US)	470	l
Diesel Exhaust Fluid (DEF)	measurement		7.9	gal (US)	30	l
Cooling System	measurement		8.4	gal (US)	31.7	l
Hydraulic Tank	measurement		40.9	gal (US)	155	l
Hydraulic System - Including Tank	measurement		71.3	gal (US)	270	l
Boom	text	Variable Adjustable Boom 5260 mm (17'3")
Stick	text	2500 mm (8'2")
Bucket	text	GD 0.98 m³ (1.28 yd³)
Shipping Height - Top of Cab	measurement		11.1	ft	3370	mm
Shipping Length	measurement		29.3	ft	8925	mm
Support Point	measurement		11.7	ft	3580	mm
Tail Swing Radius	measurement		8.5	ft	2600	mm
Counterweight Clearance	measurement		4.3	ft	1306	mm
Ground Clearance	measurement		1.4	ft	420	mm
Undercarriage Length	measurement		16.6	ft	5050	mm
Wheel Base	measurement		8.9	ft	2700	mm
Boom	text	Variable Adjustable Boom 5260 mm (17'3")
Stick	text	2500 mm (8'2")
Bucket	text	GD 0.98 m³ (1.28 yd³)
Maximum Cutting Height	measurement		32.6	ft	9950	mm
Maximum Loading Height	measurement		22.8	ft	6960	mm
Maximum Digging Depth	measurement		19.8	ft	6030	mm
Maximum Vertical Wall Digging Depth	measurement		13.9	ft	4230	mm
Maximum Reach at Ground Line	measurement		30.5	ft	9290	mm
Stick Forces (ISO)	measurement		20682	lbf	92	kN
Bucket Forces (ISO)	measurement		30799	lbf	137	kN
Note (1)	text	Range values are with dual pneumatic tires (10.00-20). Range values are calculated with a GD bucket (CW) and CW-30 quick coupler with a tip radius of 1535 mm (5'0"). Force values are calculated with heavy lift on, a GD bucket (pin-on) and a tip radius of 1462 mm (4'10").
Note	text	The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a or R1234yf. See the label or instruction manual for identification of the gas. If equipped with 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). If equipped with R1234yf (Global Warming Potential = 0.5), the system contains 0.8 kg (1.8 lb) of refrigerant which has a CO2 equivalent of 0.0004 metric tonnes (0.0004 tons).

Standard Equipment

NOTE

Standard and optional equipment may vary. Consult your Cat dealer for details.

CAB

Sound-suppressed ROPS cab
Keyless push-to-start engine control
Height-adjustable console, infinite with no tool
High-resolution 254 mm (10 in) LCD touchscreen monitor

CAT TECHNOLOGY

VisionLink™
Remote Flash and Remote Troubleshoot

ELECTRICAL SYSTEM

LED lights on chassis (left-hand, right-hand) and counterweight
Programmable time-delay LED working lights
Roading and indicator lights, front and rear
Maintenance free batteries
Centralized electrical disconnect switch

ENGINE

Power Mode Selector
One-touch low idle with automatic engine speed control
Automatic engine idle shutdown
Up to 52°C (125°F) high-ambient cooling capacity
Cold start capability down to -18°C (0°F)
Double element air filter with integrated pre-cleaner

HYDRAULIC SYSTEM

Boom, stick, and bucket drift reduction valves
Automatic hydraulic oil warm up
Heavy lift mode

SAFETY AND SECURITY

Rear and right-side-view cameras
Wide angle mirrors
Lockable disconnect switch
Anti-skid plate and countersunk bolts on service platform
Signal/warning horn

SERVICE AND MAINTENANCE

Scheduled Oil Sampling (S·O·S℠) ports
Integrated vehicle health management system

UNDERCARRIAGE AND STRUCTURES

Automatic brake/axle lock
All wheel drive

Optional Equipment