Used CAT 320CL: Applications, Condition & Export Guide
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If you have spent any time around mid-size excavators, you already know the Caterpillar 320 name. It is probably the most recognized 20-ton excavator in the world. But within that family, there is one model that old-school contractors keep coming back to — the CAT 320CL. Not the newest, not the most electronic, not the one with a touchscreen and a DEF tank. And that is exactly the point.
The “C” is the C-Series (early 2000s generation), the “L” is the long undercarriage, and together they spell one of the most forgiving, field-repairable, and globally trusted digging machines ever built. This is a plain-English look at why a used 320CL — especially one with verified hours and a clean hydraulic system — is still one of the smartest buys in the 20-ton class for Africa, the Middle East, Southeast Asia, and Latin America.
What the 320CL Actually Is
The Caterpillar 320CL sits in the 20–21.7 ton operating weight range (factory spec ~20,800 kg, depending on bucket, arm, and track shoe). It runs the Cat 3066T or 3066ATAAC — a 6-cylinder, 6.4-liter turbocharged direct-injection diesel. Net power is 103 kW (138 hp) at 1,800–2,000 rpm, with gross figures up to 107–110 kW. Some later export-market CL units are listed with the C6.4 ACERT at similar output, but the classic CL everyone respects is the 3066T Tier 2 / Stage II machine.
Core numbers buyers actually check:
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Operating weight: 19,900–21,700 kg (most export units ~20,800 kg)
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Bucket: 0.8–1.2 m³ ISO (most common 0.9–1.0 m³ trench or general bucket)
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Max dig depth: 6,550–6,730 mm
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Max reach: 9,710–9,850 mm
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Hydraulic flow: ~2 × 200 L/min, system pressure 35 MPa
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Travel speed: 5.5 km/h, swing 11.5 rpm, gradeability 35°
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Fuel tank: 320–410 L depending on market
Put those next to a CAT 320D2 (103–112 kW, ~20.7 t) and the 320CL holds its own on digging force while winning on simplicity.
The 3066T: An Engine That Forgives Bad Diesel
In most overseas markets, diesel quality is not Swiss. It varies. It sits. Sometimes it has water in it. This is where the 320CL shines.
The Cat 3066T is a mechanical direct-injection six-cylinder. No common-rail pressure sensors to cry about, no DPF to regen, no DEF urea tank to freeze in winter, no ACM module locking the throttle because the NOx sensor sneezed. You change the fuel filters, you bleed the lines if air gets in, and you go back to work. Injectors are mechanical-pop, not piezoelectric. A competent local mechanic with a torque wrench and a feeler gauge can rebuild the fuel side without a laptop.
Is a modern C6.4 ACERT or C4.4 Tier 4 Final more fuel-efficient on paper? Yes. Does that paper matter when your site is 400 km from the nearest Cat dealer and the only workshop in town has a 1998 pickup and a welding machine? Not really. The 3066T is the engine version that made the 320C/CL name legendary for “starts Monday, runs Saturday.”
Load-Sensing Hydraulics Without the Drama
The 320CL uses Cat’s proven load-sensing, pressure-compensated hydraulic system. Two axial-piston main pumps, pilot-controlled valves, boom and arm regeneration circuits. What the operator feels is:
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Predictable lever response — push a little, get a little; push hard, get a fast, controlled move
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Smooth combined motion — boom down + arm in + swing start as one gesture
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No “electronic damping” fighting your hand; it is hydraulic logic, not software guessing
For trenching, footing excavation, small-site prep, and utility work, this is arguably better than newer systems that prioritize eco-mode over feel. A 10-hour shift in a 320CL does not leave the operator feeling like they wrestled the machine — they steered it.
The “L” Undercarriage: Stability You Feel Immediately
The standard 320C is fine. The 320CL adds track length and ground contact. Track ground contact ~3,650 mm, total track length ~4,450 mm, gauge 2,200–2,380 mm, standard 600 mm pads (500/700/800 optional). That longer wheelbase does two things:
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Lowers ground pressure — better on soft clay, fill dirt, and rainy-season job sites
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Plants the machine when you crowd a truck or pry a stubborn root ball
For export buyers in delta regions, agricultural drainage work, or any site without compacted haul roads, the L-frame is the version to own. Yes, it is a bit heavier to load and a few cm wider on the trailer — but on the ground, it pays back every time the operator does not have to reposition.
Why Used Is the Right Way to Buy a 320CL
A new 20-ton Cat (Next Gen 320, 320D2 replacement) is a six-figure USD ticket with a depreciation curve that drops 25–30% in the first two years. A used 320CL with 4,000–8,000 hours and good service records typically has half its life left — these machines regularly see 12,000–15,000+ hours before major overhaul if oil is changed on time.
You buy the iron at roughly 30–45% of new price, skip the worst depreciation, and get:
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Global parts shelf — 3066T bits are in every port city from Dar es Salaam to Surubaya to Barranquilla
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Higher residual than most Korean/Chinese 20T rivals in resale
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No Tier 4 sensor tax — every electrical gremlin is something you can actually trace with a test light
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Brand pull — “Cat 320” is the single most requested 20-ton name by rental yards and municipalities
The trade-off is fuel burn vs the very latest eco models (roughly 10–15% higher) and no factory telematics. But when you save $40k–$70k on acquisition, that delta takes years to catch up — and many buyers never keep the machine long enough for it to matter.
What to Check Before You Wire Money
We tell every buyer the same five things on a 320CL:
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Hour meter + stickers — Cat dealers leave service intervals; verify the book matches the panel
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3066T cold start — no white smoke after 30 seconds, no knocking, boost builds by 1,600 rpm
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Hydraulic cylinders — weep is okay, stream is not; check rod chrome for pitting on boom/arm
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Undercarriage % — measure sprocket teeth, roller wear, pad thickness; L-frame rebuild is not cheap
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Swing bearing play — grab the counterweight, rock it; any clunk means money soon
Any seller who refuses a walkaround video with a cold engine start is selling a story, not a machine.
Who Should Actually Buy This Model
If you fit one of these, the 320CL is your excavator:
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General contractor doing foundations, trenches, septic, road widening
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Municipal / utility crew that needs 20-ton reach without 30-ton transport cost
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Equipment dealer in Africa/SEA/Middle East wanting fast-turning stock with brand pull
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Rental yard where “Cat 320” is the default request by name
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Owner-operator planning 5–8 years of work, then reselling without eating new-machine loss
If your work is pure 5-ton utility trenching, it is overkill. If you are loading 20-ton dump trucks all day in a quarry, step up to a 330 or 336. But for the vast middle of construction — the stuff that actually pays wages — the 320CL is the size that compounds.
The Bottom Line
The used CAT 320CL is not the cheapest 20-ton excavator. It is the one where engine simplicity, hydraulic honesty, undercarriage stability, and global resale line up so well that total cost of ownership beats cheaper alternatives that spend more time on stands than in the trench.
3066T up front — mechanical, tolerant, rebuildable. Load-sensing hydraulics in the veins. Long undercarriage underfoot. Cab that does not beat you up. It is a machine from the era when “Cat reliable” meant you could hand it to any operator on earth and trust the result.
We have 320CL units in stock right now — low-hour, original paint, cold A/C, full inspection videos, FOB China or CIF to your port. If you are weighing it against a 320D2, a Komatsu PC200-8, or a DX225, give us ten minutes on WhatsApp and we’ll show you why the yellow C-series still sets the benchmark in the 20-ton world.
DM “320CL” for walkaround video + FOB/CIF quote.
WhatsApp: +86 13866666316
Ships worldwide. Inspect before deposit. Always.
Spec quick-block (for your listing sheet)
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Model: Caterpillar 320CL (C-Series, long undercarriage)
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Engine: Cat 3066T / 3066ATAAC, 6.4 L, 103 kW net (138 hp) @ 1,800 rpm (Tier 2 / Stage II)
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Operating weight: 20,800 kg (range 19,900–21,700 kg)
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Bucket: 0.8–1.2 m³ (common 0.9–1.0 m³)
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Max dig depth: 6,550–6,730 mm | Reach: 9,710–9,850 mm
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Hydraulics: 2 × ~200 L/min, 35 MPa, load-sensing
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Fuel tank: 320–410 L | No DPF / No DEF
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Undercarriage: 600 mm pads std, 3,650 mm ground contact, L-frame