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Komatsu WA320: wheel loader, generations and inspection
Komatsu WA320 — a mid-sized wheel loader with an operating weight of around 13–14 t. We review the -5, -6, -7, and -8 series, key components, and what to check when buying a used WA320.
WA320 in brief
WA320 — a versatile wheel loader for construction, quarrying, municipal services, and agriculture. It handles heavy materials, loads trucks, and works with buckets or other attachments.
Thanks to its mid-size, this loader is more manoeuvrable than larger models, making it ideal for tight spaces. There's a wide range available in the used market.
Series — what's the difference
Older versions (-3, -5) are simpler, with less electronics. Newer -6, -7, and -8 series feature a more economical engine, a more comfortable cab, and advanced electronics.
Some machines come with a Z (Z-linkage) lift arm, better suited for digging, while others have a parallel lift arm, designed for pallets and buckets. It's worth checking the configuration before buying.
Engine and key components
The WA320 is powered by a six-cylinder Komatsu diesel engine. Newer versions feature systems that meet stricter Stage standards, which are crucial for the buyer.
Key components: automatic transmission with torque converter, axles, frame pivot joint, lift arm, boom cylinders, hydraulic pump, braking system, tyres.
What to check when buying a used WA320
Check the engine hours, service history, smoke, starting, and oil leaks. Test the gearbox — shifts should be smooth, without hesitation or slippage.
Inspect the chassis joints, lift strut mounts and bushes, suspension cylinders, tyres, and brakes. Check the chassis and suspension for cracks and corrosion.
Generations and trims
Names and equipment vary by market and production year; we list the versions most commonly found in Europe.
WA320-5
-5 seriesAn older, more basic generation.
- Often — simpler electronics
- Lower price
- A pre-purchase inspection is essential
WA320-6
-6 seriesAn improved generation with better comfort.
- A more comfortable cabin
- Often — a more economical engine
- Often — KOMTRAX
WA320-7
-7 seriesModern version with stricter standards.
- Often features SCR and particle filter
- More advanced electronics
- More efficient hydraulics
WA320-8
8 seriesThe latest version.
- Often features an advanced control system
- Larger screen
- Optional additional features
Comparison of WA320 series
| WA320-5 | WA320-6 | WA320-7 | |
|---|---|---|---|
| Who it's for | For budget work | For everyday use | For intensive and efficient work |
| Engine technology | Older | Mid-age | Modern |
| Electronics | Basic | Mid-range | Advanced |
| Price in the used market (relatively) | Budget-friendly | Mid-range | Premium |
For budget-conscious buyers, the WA320-5 or -6 with a good history often fits the bill. If fuel efficiency and modern systems are key, look for the -7 or newer.
Pros
- Nimble mid-size
- Reliable Komatsu tech
- Good parts and service availability
- Holds its value well
Cons
- Newer versions with SCR and particulate filters require maintenance
- Expensive tyre and gearbox maintenance
- Smaller bucket capacity than larger loaders
Frequently asked questions
What is the weight of the Komatsu WA320?
Operating weight around 13–14 tonnes, depending on the series and specification. Check the exact weight in the documentation.
How does the WA320 differ from the WA380?
The WA380 is larger and more powerful, with a bigger bucket capacity. The WA320 is more manoeuvrable and cheaper.
What is KOMTRAX?
It's Komatsu's remote monitoring system, showing the machine's operating hours, location and other data. It makes it easier to verify the actual usage history.
Updated 2026-10-21 · Trim levels and equipment vary by market and model year — check the equipment of the specific car. · Translated automatically
