Cat 320 vs Cat 323

The Cat 323 is the heavier machine, at 22.9 t against 21.3 t.

The Cat 320 is ahead on: dumps higher, more digging or pushing force. The Cat 323 is ahead on: digs deeper, reaches further, bigger bucket or body.

Below, every figure both makers publish sits side by side, with the Cat 320 and the Cat 323 drawn to the same scale from their dimension drawings.

Cat · excavator
Cat 320
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Cat · excavator
Cat 323
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At a glance

Bold is the machine ahead on each figure, with its lead.

Figure	Cat 320	Cat 323
Operating weight	21,300 kg	22,900 kg
Max digging depthHigher is better	6.72 m	6.73 m
Max reach at ground levelHigher is better	9.86 m	9.87 m
Max dumping heightHigher is better	6.49 m	6.48 m
Bucket capacityHigher is better	1.19 m³	1.3 m³+9%
Bucket digging forceHigher is better	150 kN+7%	140 kN
Overall length	9.53 m	9.53 m

All specifications

Every figure the makers publish. Search for one, or show only those that differ.

Differences only(42)

FigureCat 320 Cat 323

Dimensions

Overall height (to top of cab)2.96 m2.96 m

Handrail height2.95 m2.95 m

Overall length9.53 m9.53 m

Tail swing radius2.83 m2.83 m

Ground clearance, counterweight1.05 m1.05 m

Ground clearance (minimum)0.47 m0.47 m

Track length4.45 m4.45 m

Track length on ground3.65 m3.65 mlength to centre of rollers

Track gauge2.38 m2.38 m

Overall width2.98 m2.98 mundercarriage width, 600 mm shoes

Shoe width0.6 m0.6 mstandard HD triple grouser

Overall height (to top of boom)Not published3.16 m

Top of OPG heightNot published3.1 mwith optional operator protective guard

Upperframe widthNot published2.78 m

Overall width (790 mm shoes)Not published3.17 m

Shoe width (optional)Not published0.79 moptional HD triple grouser

Performance

Max digging depth6.72 m6.73 m

Max reach at ground level9.86 m9.87 m

Max digging height9.37 m9.45 m

Max dumping height6.49 m6.48 m

Min loading height2.17 m2.16 m

Max depth cut for 2,440 mm level bottom6.55 m6.56 m

Max vertical wall digging depth5.19 m5.62 m

Bucket capacity1.19 m³HD bucket1.3 m³HD bucket

Bucket digging force150 kN140 kN

Arm digging force106 kN107 kN

Swing speed11.3 r/min11.25 rpmCE-marked machines may be set lower

Max swing torque82 kN·m82 kN·m

Bucket digging force (Auto Dig Boost)Not published152 kNISO

Arm digging force (Auto Dig Boost)Not published116 kNstick digging force, ISO

Travel speed (high)Not published5.7 km/hmaximum travel speed

Max drawbar pullNot published204 kN

GradeabilityNot published35°/70%

Weight

Operating weight21,300 kg22,900 kg

Operating weight (5.4 t counterweight)Not published24,300 kg

Ground pressureNot published47.6 kPa4.2 t counterweight, 600 mm shoes

CounterweightNot published4,200 kgstandard; 5.4 t optional

Engine

Engine modelCat C7.1Cat C7.1

EmissionsMeets Brazil MAR-1 emission standards, equivalent to U.S. EPA Tier 3 and EU Stage IIIAMeets Brazil MAR-1 emission standards, equivalent to U.S. EPA Tier 3 and EU Stage IIIA

Net power117 kW (157 hp)ISO 9249, at 1,800 rpm117 kW (157 hp)ISO 9249, at 1,800 rpm

Net power (DIN)159 hp (metric)ISO 9249 (DIN)159 hp (metric)ISO 9249 (DIN)

Gross power118 kW (158 hp)ISO 14396118 kW (158 hp)ISO 14396

Gross power (DIN)160 hp (metric)ISO 14396 (DIN)160 hp (metric)ISO 14396 (DIN)

Bore105 mm105 mm

Stroke135 mm135 mm

Displacement7 L7 L

Biodiesel capabilityUp to B20Up to B20

Hydraulics

Pump flow429 L/minMain system, maximum flow429 L/min

Max pressure35 000 kPaEquipment35 000 kPaequipment, normal

Max pressure, equipment (lift mode)38 000 kPaNot published

Max pressure, travel34 300 kPa34 300 kPa

Max pressure, swing27 500 kPa27 500 kPa

Max pressure, equipment (heavy lift / Auto Dig Boost)Not published38 000 kPa

Boom cylinder boreNot published120 mm

Boom cylinder strokeNot published1,260 mm

Stick cylinder boreNot published140 mm

Stick cylinder strokeNot published1,504 mm

Bucket cylinder boreNot published120 mm

Bucket cylinder strokeNot published1,104 mm

Service capacities

Fuel tank345 L345 L

Cooling system25 L25 L

Engine oil25 L25 L

Swing drive (each)6 LNot published

Final drive (each)5 LNot published

Hydraulic system, with tank234 L234 L

Hydraulic tank115 L115 L

Swing driveNot published12 L

Final driveNot published5 L

Service intervals

Engine oil and filter1,000 hours1,000 hours

Fuel filters1,000 hours1,000 hours

Swing drive oil1,000 hoursFirst change at 500 h1,000 hoursFirst change at 500 h

Final drive oil2,000 hoursEach side; first change at 500 h2,000 hoursEach side; first change at 500 h

Hydraulic return filter3,000 hours3,000 hours

Hydraulic oil6,000 hours6,000 hours

Coolant12,000 hours12,000 hours

Boom and stick linkage grease500 hoursDaily for the first 50 h500 hoursDaily for the first 50 h

Bucket linkage grease100 hoursDaily for the first 50 h100 hoursDaily for the first 50 h

Undercarriage

Track shoes (each side)Not published49

Track rollers (each side)Not published8

Carrier rollers (each side)Not published2

Sound

Exterior sound levelNot published100 dB(A)ISO 6395:2008

Operator sound levelNot published70 dB(A)ISO 6396:2008

Sources: Cat 320 Hydraulic Excavator (Tier 3) brochure AEXQ2332-09 (2024, build 07G) · Cat 323 Hydraulic Excavator Technical Specifications AEXQ4005-01 (11-2025, Tier 3 / MAR-1, build 07H) - figures and dimension drawing

Drawn to scale

Side views measured off each maker's dimension drawing, front edges and ground lined up.

Cat 320Cat 323Same scale, front edges and ground lined up.

Cat 320 vs Cat 323: questions

Which is bigger, the Cat 320 or Cat 323?

By operating weight the Cat 323 is the biggest at 22.9 t, then the Cat 320 at 21.3 t.

Which digs deeper, the Cat 320 or Cat 323?

The Cat 323: Cat 320 6.72 m, Cat 323 6.73 m (max digging depth), a 0% difference.

Which reaches further, the Cat 320 or Cat 323?

The Cat 323: Cat 320 9.86 m, Cat 323 9.87 m (max reach at ground level), a 0% difference.

Which has the bigger bucket, the Cat 320 or Cat 323?

The Cat 323: Cat 320 1.19 m³, Cat 323 1.3 m³ (bucket capacity), a 9% difference.

Where do these figures come from?

Each model's own published spec sheet or brochure, linked under the table. Builds differ by market and year, so confirm the figures for a particular machine with its dealer.

Can I rent or buy these machines in the UAE?

Each model's page lists the ones for hire and for sale on EquipmentsFinder now, with typical prices in AED.