Model Spotlight

Case 340 Articulated Dump Truck: Heavy-Class 6x6 ADT

The Case 340 Articulated Dump Truck is the largest Case ADT — heavy-class 6x6 articulated dump truck for major earthmoving, mining-edge, and infrastructure projects. Cummins heavy-duty diesel, ZF planetary automatic, articulated chassis with rear bogie.

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Broken Tractor Editorial Team• Updated May 2026• 9 min read

Where the 340 fits in the Case articulated dump truck line

The Case 340 is the largest Case Articulated Dump Truck — above the 330B in payload, chassis size, and hauling capacity. Heavy-class 6x6 ADT for major earthmoving, mining-edge, and infrastructure work where the 330B runs out of payload.

Engine, hydraulics, and drivetrain

The 340 runs a Cummins heavy-duty diesel through a ZF planetary automatic transmission into a 6x6 drivetrain — front axle plus a rear bogie. Articulated chassis pivots between the front truck and the rear bogie / dump body. Hoist hydraulics raise the heavy-class dump body. 8603163 brake pin cross-fits Case 521–921 wheel loaders and 335–340B Articulated Dump Trucks — a broad Case brake-pin service item.

Common service items on the 340

• Engine internals: Cummins heavy-duty diesel pistons, rings, sleeves, bearings, head gaskets, full overhaul kits.
• Cooling system: Radiator, water pump, thermostat, fan, hoses, belts, charge-air cooler. Heavy-class radiator capacity matched to the 340’s engine.
• Transmission: ZF planetary clutch packs, transmission filters and oil, torque converter service.
• Drivetrain / axles: Front axle, rear bogie axles, planetary final drives, driveshafts. 8603527 axle cover O-ring cross-fits Case 521–1021 loaders and 325–330B ADTs (also applicable to 340 axle service depending on configuration).
• Hoist hydraulics: Heavy-class dump body hoist cylinder seal kits, hoist pump rebuild, control valve service.
• Articulation: Front-to-rear articulation pivot pins, bushings, steering cylinder seal kits.
• Brakes: Wet-disc heavy service brakes with retarder service. 8603163 brake pin is the direct-fit cross-fit brake-pin service item (335–340B + Case 521–921 loaders).
• Tires + wheels: Heavy off-highway radials, rim and wheel-bearing service.
• Cab and electrical: Cab HVAC, ECU, instrument cluster, sensors, wiring harness, telematics.

Parts for the Case 340 Articulated Dump Truck at Broken Tractor

What to verify before ordering

• Serial number. Confirm the serial on the main frame near the articulation joint or on the cab data plate before ordering year-specific parts.
• Engine serial. Cummins engine internal and aftertreatment parts are calibrated to specific engine serials.
• ZF transmission revision. ZF planetary transmissions saw revisions during production — confirm by serial.
• Brake pin range. 8603163 brake pin fits the broad Case 521–921 wheel loader + 335–340B ADT range; confirm pin position before ordering.
• Hoist cylinder bore. Heavy-class hoist cylinder seal kit fit depends on bore dimension — measure before ordering.

Why the 340 still earns a paycheck

The Case 340 is the largest Case articulated dump truck — heavy-class earthmoving where on-highway trucks can’t go and the 330B runs out of payload. Major mining-edge work, large infrastructure projects, quarries, and high-volume construction. 6x6 articulated configuration gives soft-ground hauling capability that wheeled trucks can’t deliver.

Maintenance priorities on a 340: clean fuel and quality filtration on the Cummins, ZF transmission oil quality and clutch-pack service, hoist hydraulic system condition, articulation pivot lubrication, brake-pin service (8603163 cross-fit), and heavy-class cooling and tire monitoring. Broken Tractor maintains parts coverage across the Case ADT line.