Used 2012 Komatsu WA320-6 Wheel Loader With 3.5-Yard Bucket and JRB Quick Coupler For Sale | Low 3,438 Hours

Komatsu WA320 Wheel Loader with JRB Quick Coupler: Full Specs, Real-World Performance, and Why Low Hours Matter

This is a used 2012 Komatsu WA320-6 wheel loader — 170hp, 3.5-yard GP bucket, JRB quick coupler, 3,438 total hours, with fewer than 500 of those accumulated in the last 8 years of single-owner operation. Enclosed ROPS cab, factory AC/heat, hydrostatic drive, and a full matching set of Michelin tires. Located in Fairview, NJ.

If you're in the market for a mid-size wheel loader that can go straight to work without a repair bill attached, this machine deserves your attention. Here's everything you need to know about the WA320-6 platform, why the JRB quick coupler matters operationally, and how to evaluate whether this specific unit fits your application.

What Is the Komatsu WA320-6 Wheel Loader?

The Komatsu WA320-6 is a mid-size articulated wheel loader in the 170-horsepower class, producing an operating weight of 37,000 lbs and a standard bucket capacity of 3.5 cubic yards. Komatsu positions the WA320-6 between its compact loaders and larger production-class machines — a range that handles the broadest set of job site tasks without the operating costs of a 200hp-plus unit.

The "-6" generation introduced several refinements over the WA320-5: improved cab ergonomics, refined hydraulic response, and the SAA6D107E-01 Tier II engine, and it was designed for straightforward upkeep with gull-wing engine doors for easy access. The WA320 platform has logged millions of hours across construction, municipal, quarry, and industrial applications worldwide. Parts are widely stocked through the Komatsu dealer network nationally — this is not an orphaned platform.

For buyers comparing the WA320-6 against competitors in the same horsepower class, the Komatsu's hydrostatic drive and Komatsu-manufactured engine are the two mechanical differentiators that consistently show up in long-term ownership discussions. Both are covered in detail below.

Komatsu WA320-6 Full Technical Specifications and Bucket Capacity

The fastest way to waste time is to fall in love with a machine that doesn't match your tonnage requirements or attachment system. Verify these specs against your job site demands before you go any further.

• Make/Model: Komatsu WA320-6

• Year: 2012

• Stock #: DS-32012

• Serial/VIN #: KMTWA108C36A35381

• Hours: 3,438 total (fewer than 500 in last 8 years)

• Engine: 170hp Komatsu SAA6D107E-01 Tier II diesel

• Drive System: Hydrostatic transmission

• Operating Weight: 37,000 lbs

• Bucket: GP 3.5 cubic yard capacity — WA320 bucket capacity range is 3.0 to 4.2 yd³ — cutting edge like new

• Bucket Dimensions: 8'10"L x 5'W x 54"H

• Tires: 20.5 R25 Michelin — full matching set

• Machine Dimensions: Transport specs: length 27 ft 3 in, width 8 ft 0 in, height 10 ft 6 in; measured 26'L x 8'6"W x 10'6"H (bucket removed)

• Coupler: JRB quick coupler

• Cab: Enclosed ROPS, factory AC/heat, air-cushioned seat

• Location: Fairview, NJ 07022

These are verified specs pulled directly from the machine. Everything is inspectable in person by appointment.

Why the JRB Quick Coupler Changes the Math on This Machine

A wheel loader without a quick coupler is a single-tool machine. A WA320-6 with a JRB quick coupler is a platform.

The JRB quick coupler on this unit allows tool-free attachment changes in minutes — not hours. Swap between the GP bucket, pallet forks, a snow push, a grapple, or any JRB-compatible attachment without removing pins manually. For contractors running multiple attachment types across a week's worth of jobs, that capability eliminates the need for a second machine on a significant percentage of tasks.

Here's what that means practically: if you're currently renting a telehandler for pallet work two days a week and using a loader for bulk material three days, a quick-coupler loader with forks collapses those two machines into one. The WA320-6's 3.5-yard bucket handles bulk material at scale; the quick coupler makes switching to forks a 5-minute task rather than a 45-minute pin swap.

JRB-compatible attachments are widely available on the used market. The coupler on this machine is factory-installed and confirmed fully functional — it locks and releases cleanly.

Hydrostatic Drive: Why It Matters in Daily Operation

The WA320-6 uses a hydrostatic transmission rather than a conventional powershift. Buyers unfamiliar with the difference often underestimate how much it affects daily productivity and long-term operating costs. On the WA320-8E0, max travel speed is 38 km/h.

A hydrostatic drive delivers infinitely variable ground speed in both directions — no discrete gear ratios, no clutch engagement. In practice, that means the operator can modulate speed precisely when loading a truck, working in a tight stockpile, or grading a surface. The machine responds to inputs rather than forcing the operator to manage gear selection during approach-and-load cycles, and the HST provides dynamic braking to reduce wear on service brakes. SmartLoader logic also helps reduce fuel consumption.

For high-cycle applications — truck loading, aggregate handling, feed yard work — the hydrostatic system reduces operator fatigue over a full shift. Fewer gear changes means fewer decisions, and fewer decisions over 8–10 hours translates directly into production consistency. Single-pedal operation also helps reduce periodic service requirements and extend brake life by reducing service-brake wear. Hydrostatic drive also eliminates powershift clutch wear, which is one of the more expensive drivetrain repair items on competing machines.

The hydrostatic drive on this WA320-6 responds smoothly with no hesitation or slippage. Traction control can use auto mode to prevent tire spin in slippery working conditions and maintain control in virtually all conditions, including when changing from forward to reverse. That's a verifiable statement — not a sales adjective.

How to Read 3,438 Hours on a Komatsu WA320-6

Hours alone don't tell the story. The question is always: what kind of hours, and how were they maintained?

This machine has 3,438 total hours. The current owner has operated it for 8 years and accumulated fewer than 500 of those hours during that period — meaning roughly 2,900 hours were accumulated before the current owner's tenure, and the machine has barely turned over since. Komatsu wheel loaders in the WA320 class are engineered for 15,000–20,000 hours with proper maintenance. At 3,438 hours, this machine has consumed roughly 17–23% of its design service life.

For comparison: a 2018 machine with 6,000 hours in continuous production service represents more wear in most mechanical systems than this 2012 unit with 3,438 hours, half of which accumulated at low utilization under documented single-owner care. The year on the title matters less than the hours on the meter and the condition of the wear components.

Evaluate it this way:

• Cutting edge: Like new — full material remaining, no immediate replacement cost

• Tires: Full matching set of 20.5 R25 Michelins — replacing one loader tire in this size class runs $1,500–$2,500 installed; a full set in serviceable condition represents thousands in remaining value

• Engine: Starts readily, runs clean, no smoke, no abnormal wear signs

• Hydraulics: No leaks, full function confirmed

• Cab systems: AC, heat, gauges, and lighting all operational

Buy this machine and you're not inheriting someone else's deferred maintenance list.

Ideal Applications for the Komatsu WA320-6

The WA320-6 is a mid-size machine. It is not the right tool for every job, and knowing where it fits prevents buying a machine that underperforms your requirements.

The WA320-6 with 3.5-yard bucket is well suited for:

• Truck loading and hopper feeding at construction sites, quarries, and recycling facilities

• Stockpile management and aggregate handling

• Municipal snow removal and road maintenance operations

• Site cleanup, land clearing support, and material relocation

• Feed yards, dairy operations, and agricultural material handling

• Industrial and warehouse material handling, especially combined with pallet forks via quick coupler

The WA320-6 is better suited for mid-volume daily production than for high-tonnage continuous loading cycles where a larger machine in the 200–250hp class would reduce cycle time more cost-effectively. Its parallel-lift linkage combines z bar breakout force with parallel-lift characteristics, helping with material retention and stability during loading. With a breakout force of 29,000.36 lbs, it has the push needed for confident bucket fill in stockpile and truck-loading work. If you're running 400+ truck loads per day in a quarry, the WA320-6 will work — it will just work harder than necessary. For everything else in this list, it's sized correctly.

For municipal buyers, the combination of the quick coupler (snow push, salt spreader, bucket cycling), hydrostatic drive (precise control in tight road environments), and enclosed cab with factory climate control makes this a particularly strong fit.

Enclosed Cab and Operator Environment

The ROPS-certified enclosed cab on this WA320-6 is factory-equipped with air conditioning and heat — not aftermarket additions. Both systems function properly. The air-cushioned operator seat reduces fatigue during extended production days. Primary controls are within ergonomic reach from the operator position.

For fleet managers: a functional, comfortable cab directly affects operator retention and per-shift productivity. Operators running uncomfortable equipment make more mistakes, work more slowly, and quit sooner. This cab is in excellent condition throughout.

Michelin Tires: What a Matching Set Is Worth

Tire condition is one of the fastest ways a used machine deal falls apart after purchase. This WA320-6 comes with a full matching set of 20.5 R25 Michelin tires — all four positions, all the same brand, all matching wear.

Mismatched tires create uneven wear patterns, handling asymmetry, and accelerated component stress on the axle and steering system. A matching set eliminates all of those concerns. In the 20.5 R25 size class, individual tire replacement installed runs $1,500–$2,500 per tire depending on brand and supplier. Four tires represents $6,000–$10,000 in replacement value at current market rates — value that's already on this machine.

Why This Specific Unit Stands Out in the Used Market

Plenty of used WA320-6 machines trade hands each year. Most have higher hours, mixed maintenance histories, worn cutting edges, and mismatched tires. Finding a unit with this combination of characteristics in the same package is uncommon.

What separates this machine from the typical used listing:

1. Hours vs. utilization: 3,438 total hours with fewer than 500 in 8 years — documented single-owner light use

2. Cutting edge: Like new, full material remaining — no bucket replacement cost on day one

3. Tires: Full matching Michelin set — no tire budget required

4. Quick coupler: JRB factory-installed, fully functional — immediate multi-attachment capability

5. Cab: Factory climate control confirmed operational — ready for year-round production

6. Condition overall: Hydraulics clean, engine clean, drive smooth — no reconditioning required

A machine that goes to work on day one without surprises is worth more than a lower-hour unit that needs $15,000 in immediate repairs. Factor in the cost of downtime before you factor in the purchase figure.

Frequently Asked Questions: Komatsu WA320-6 with JRB Quick Coupler

What attachments are compatible with the JRB quick coupler on the WA320-6?
The JRB quick coupler is compatible with any JRB-pattern attachment, including GP buckets, pallet forks, snow pushes, grapples, and light material buckets. JRB-compatible attachments are widely available through equipment dealers and the used attachment market. The coupler allows tool-free swaps in minutes, making the WA320-6 a multi-function machine across a single workday.

What is the expected remaining service life on a WA320-6 with 3,438 hours?
Komatsu WA320-class wheel loaders are engineered for 15,000–20,000 hours with proper maintenance. At 3,438 hours, this machine has consumed roughly 17–23% of its design life. With documented low utilization, like-new wear components, and a clean mechanical report, the remaining service life is substantial — measured in years, not months, under normal working conditions.

Is the Komatsu SAA6D107E engine difficult to maintain or find parts for?
The SAA6D107E-01 Tier II is a well-supported engine. Komatsu maintains a national dealer network with parts availability for this engine series. Routine maintenance items — filters, belts, fluids — are straightforward to source. This engine is not an anomaly in the market; it powers a significant portion of Komatsu's mid-size equipment fleet manufactured during this period.

How does the WA320-6 compare to similar machines from Caterpillar or John Deere in this horsepower class?
The WA320-6 competes directly with the Caterpillar 924K and John Deere 524K in the 160–180hp class. The Komatsu's hydrostatic drive is a differentiator in tight-space or high-cycle applications where precise speed modulation matters. Parts availability and dealer support are comparable across all three brands in major markets. Machine-to-machine comparisons in the used market depend heavily on individual unit condition and hours rather than brand alone.

Inspect It, Then Decide

This machine is located in Fairview, NJ 07022 and available for inspection by appointment. Every system described above is verifiable in person — start it, drive it, cycle the bucket, test the AC, and confirm the quick coupler operation yourself. Shipping costs depend on logistical factors.

Financing is available through our lending partners — zero down, fast application, competitive rates for qualified buyers.

Contact Jay Trevorrow directly: (973) 886-3020. Call or visit to help customers compare transport details in order to confirm fit before purchase and review next steps.