Excavator · 20 tonne · specs & buyer's guide
Cat 320 Excavator Price Guide
The Cat 320 at a glance — full manufacturer specs, buying guidance, what it's used for and what drives its resale value. Verified used-price ranges publish here as our data clears the sample-size gate.
We don't have a verified used price range for the Cat 320 right now.
HeavyBook publishes a market range only once it clears our sample-size gate — and every verified range carries the observations behind it. Without a sourced basis, we show no used figure.
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The twenty-tonne class is the default civil excavator size in Australia, and the current-generation 320 is the volume seller of the Cat range through the national dealer territories. Civil and earthmoving contractors buy it, hire fleets run it wet and dry, and ex-fleet examples flow steadily onto the used market as a result. Australian-delivered units follow the regional specification without exhaust aftertreatment or AdBlue — a running-cost point buyers weigh against later-emissions grey imports. Most local machines run a hydraulic quick hitch with GP and mud buckets, and technology fitment varies by build, so verify grade-assist and payload options on the individual machine rather than assuming. Undercarriage life and service history separate otherwise identical examples.
What a Cat 320 is used for
The Cat 320 is the default twenty-tonne-class civil excavator — the general-purpose digging machine of subdivisions, drainage jobs and bulk excavation.
- Bulk excavation and detailed trenching
- Subdivision and drainage works
- Load-out of trucks on civil sites
- Hammer and attachment work on rock and demolition
What Moves the Price
Hitch + bucket set
A hydraulic hitch with a proper bucket set is the single biggest add. Machines sold bare consistently land at the low end of the range.
Low hours for age
Well under average annual hours reads as a weekend machine. Buyers pay a visible premium over the same year at contractor hours.
Auction vs dealer
Auction is the floor of the market. Dealer and private sales recover most of the gap — at the cost of time and effort.
Tracks & condition
Worn rubber tracks and tired pins get quoted straight off the asking price — buyers price the fix before they price the machine.
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Pre-purchase inspection checklist
The checks that separate a good buy from a money pit — pins and bushes, tracks, service history red flags. Requests are reviewed and emailed manually.