Case CX350D Hydraulic Excavator: 35-Ton D-Series Tier 4 Final
The Case CX350D is a 35-ton class D-Series hydraulic excavator powered by a Tier 4 Final diesel. Positioned between the CX350C predecessor and the larger CX370D, the CX350D is a production-class machine for general site work, utility installation, and quarry duty.
Where the CX350D fits in the Case excavator line
The CX350D is a 35-ton class D-Series excavator, sitting between the CX350C predecessor and the larger CX370D in Case’s full-size excavator lineup. The D-Series introduced Tier 4 Final emissions controls across the Case full-size excavator family along with refined hydraulic controls and operator station updates.
Case CX350D Excavator - Quick Specs
- Class
- 35-Ton Excavator
- Generation
- D-Series
- Engine
- Tier 4 Final Diesel
- Aftertreatment
- DPF + SCR (DEF)
- Drivetrain
- Hydrostatic Dual-Path
- Undercarriage
- Steel Track
- Tail Swing
- Conventional
- Predecessor
- Case CX350C
- Larger Sibling
- Case CX370D
Engine, hydraulics, and drivetrain
The CX350D runs a Tier 4 Final diesel through a hydrostatic dual-path drivetrain into a steel-track undercarriage. A load-sensing main piston pump drives boom, dipper, bucket, swing, and propel functions through electrohydraulic control valves. Tier 4 Final aftertreatment includes a diesel particulate filter (DPF) for soot control and selective catalytic reduction (SCR) with diesel exhaust fluid (DEF) dosing for NOx reduction.
The hydrostatic propel system uses independent travel motors on each track for full counter-rotation and precise low-speed control. Implement hydraulics feed boom, dipper, bucket, and optional auxiliary circuits for thumb, hammer, or shear attachments. The swing system uses a dedicated swing motor through a planetary reduction onto the swing bearing.
Common service items on the CX350D
- Engine internals: Tier 4 Final diesel pistons, rings, sleeves, head gaskets. Common-rail injection.
- Tier 4 Final aftertreatment: DPF service intervals and regeneration behavior, DEF tank and dosing module, SCR catalyst, EGR cooler service.
- Fuel system: Common-rail injectors, lift pump, primary and secondary filters with tight water-separator standards.
- Cooling system: Radiator, water pump, thermostat, fan, charge-air cooler, hoses, belts.
- Hydraulic system: Boom, dipper, bucket, and swing cylinder seal kits; main pump rebuild; electrohydraulic control valves; hoses.
- Boom and dipper: Pin and bushing service at every joint, bucket pins, thumb attachment hardware, quick coupler service.
- Undercarriage: Steel track inspection and replacement, rollers, idlers, drive sprockets, recoil springs.
- Swing system: Swing motor and reduction gear service, swing bearing inspection, swing brake.
- Electrical / ECU: Engine ECU, instrument cluster, sensors, harness, telematics module on equipped units.
- Cab glass and wiper: KHN16820 24-inch wiper blade, KHN3046 front lower glass, and KHN2632 front upper glass cross-fit across Case and Link-Belt excavators.
- Operator station: Seat, joystick controls, pedal linkage, instrument panel, cab HVAC.
Parts we carry for the Case CX350D
| Category | Common Parts | Browse |
|---|---|---|
| Engine | Tier 4 Final diesel internals, pistons, rings, sleeves, gaskets | Browse Engine |
| Aftertreatment | DPF, DEF, SCR, EGR components | Browse Aftertreatment |
| Fuel System | Common-rail injectors, lift pump, filters | Browse Fuel System |
| Cooling | Radiator, water pump, charge-air cooler, hoses | Browse Cooling |
| Hydraulics | Main pump, swing motor, cylinders, seal kits, valves | Browse Hydraulics |
| Boom / Dipper | Pins, bushings, bucket and quick-coupler hardware | Browse Boom / Dipper |
| Undercarriage | Steel tracks, rollers, idlers, sprockets, recoil springs | Browse Undercarriage |
| Swing | Swing motor, reduction gear, swing bearing | Browse Swing |
| Cab Glass / Wiper | KHN16820 wiper, KHN3046 lower glass, KHN2632 upper glass (Case/Link-Belt cross-fit) | Browse Cab Glass |
| Electrical / ECU | ECU, sensors, harness | Browse Electrical |
| Operator Station | Seat, joysticks, pedal linkage, gauges | Browse Operator Station |
Need a part for your Case CX350D Excavator?
Tier 4 Final aftertreatment components, common-rail fuel system parts, and hydraulic main pumps are the highest-value items on a CX350D. Call our parts team with your serial number.
Request a PartWhat to verify before ordering
- Serial number. Confirm the machine serial on the CX350D before ordering year-specific parts.
- Engine serial. Engine internal parts must match the engine serial number.
- Hydraulic cylinder bore. Cylinder seal kit fit depends on bore dimension - measure before ordering.
- Tier 4 emissions revision. DPF and DEF/SCR components saw revisions during production - confirm by serial.
- Engine ECU calibration. Common-rail injectors and ECU sensors are calibrated to specific build years.
- Bucket and quick coupler. Quick-coupler interface varies - confirm before ordering attachment-side hardware.
Why the CX350D still earns a paycheck
The Case CX350D is a 35-ton class production excavator - general site work, utility installation, residential and commercial earthmoving, and mining or quarry work depending on configuration. It pairs a Tier 4 Final emissions package with a proven hydrostatic dual-path drive and a load-sensing implement hydraulic system that gives operators the metering needed for precision trench work without giving up the bucket-curl power required for heavy digging.
Maintenance priorities on a CX350D: clean fuel and tight water separation for common-rail injection, DPF regen behavior tracking, DEF quality, hydraulic oil condition, swing-bearing lubrication, steel-track tension and undercarriage wear monitoring, and pin and bushing service at every boom joint. Broken Tractor maintains parts coverage across the Case excavator family.
