Case CX300C Hydraulic Excavator: 30-Ton C-Series Production Excavator
The Case CX300C is a 30-ton class C-Series hydraulic excavator, sitting between the CX290D Material Handler and the CX300D in Case's full-size excavator lineup. Tier 4 Interim emissions, hydrostatic dual-path drive, and a refined operator cab make it a steady production pick for general site work, utility installation, and commercial earthmoving.
Where the CX300C fits in the Case excavator line
The CX300C is a 30-ton class C-Series excavator. It sits between the CX290D Material Handler and the CX300D in Case's full-size excavator lineup. The C-Series brought Tier 4 Interim emissions controls, a refined operator cab, and updated electrohydraulic control valves over earlier Case full-size excavator generations.
Case CX300C Excavator - Quick Specs
- Class
- 30-Ton Excavator
- Generation
- C-Series
- Engine
- Tier 4 Interim Diesel
- Drivetrain
- Hydrostatic Dual-Path
- Undercarriage
- Steel-Track
- Tail Swing
- Conventional
- Serial Plate
- RH lower cab frame, below windshield
- Smaller Sibling
- CX290D Material Handler
- Larger Sibling
- CX300D
Engine, hydraulics, and drivetrain
The CX300C runs a Tier 4 Interim diesel through a hydrostatic dual-path drivetrain into a steel-track undercarriage. The main hydraulic pump (typically a load-sensing piston pump) drives boom, dipper, bucket, swing, and propel through electrohydraulic control valves.
Aftertreatment on the C-Series includes a diesel particulate filter (DPF) with periodic regeneration cycles, EGR cooling, and on later builds, DEF/SCR components. The common-rail fuel system requires tight water separation and clean fuel - injector damage from contaminated diesel is the most expensive avoidable failure on these machines.
Common service items on the CX300C
- Engine internals: Tier 4 Interim diesel - pistons, rings, sleeves, head gaskets, bearings. Common-rail injection.
- 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 / 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 CX300C
| Category | Common Parts | Browse |
|---|---|---|
| Engine | Tier 4 Interim 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 |
| 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, instrument cluster | Browse Electrical |
| Operator Station | Seat, joysticks, pedal linkage, gauges | Browse Operator Station |
Need a part for your Case CX300C Excavator?
Common-rail injectors, hydraulic main pumps, swing bearings, and undercarriage components are the highest-value items on a CX300C. Call our parts team with your serial number.
Request a PartWhat to verify before ordering
- Serial number. Confirm the serial on the CX300C 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 CX300C still earns a paycheck
The Case CX300C is a 30-ton class production excavator suited to general site work, utility installation, residential and commercial earthmoving, and mining or quarry work depending on configuration. It runs in fleets across the country and parts support remains strong for the C-Series platform.
Maintenance priorities on a CX300C: clean fuel and tight water separation for common-rail injection, DPF regen behavior tracking, hydraulic oil condition, swing-bearing lubrication, steel-track tension and undercarriage wear monitoring, and pin and bushing service at every joint. Broken Tractor maintains parts coverage across the Case excavator family.
