Case CX300E Hydraulic Excavator: Tier 4 Final 30-Ton E-Series
The Case CX300E is a 30-ton class E-Series hydraulic excavator, sitting between the CX300D and the CX330 in Case’s full-size excavator lineup. It pairs a Tier 4 Final diesel with a load-sensing piston hydraulic system and a conventional tail-swing steel-track undercarriage built for production earthmoving.
Where the CX300E fits in the Case excavator line
The CX300E is a 30-ton class E-Series excavator. It sits between the CX300D and the CX330 in Case’s full-size excavator lineup, representing the current Tier 4 Final emissions generation of the 30-ton platform. The E-Series brought refined electrohydraulic control, updated cab electronics, and full Tier 4 Final aftertreatment to a chassis with deep parts and dealer support across CNH’s heavy excavator family.
Case CX300E Excavator - Quick Specs
- Class
- 30-Ton Excavator
- Generation
- E-Series
- Engine
- Tier 4 Final Diesel
- Aftertreatment
- DPF + SCR (DEF)
- Drivetrain
- Hydrostatic Dual-Path
- Undercarriage
- Steel-Track, Conventional Tail Swing
- Serial Plate
- Right-hand lower cab frame, below windshield
- Predecessor
- Case CX300D
- Larger Sibling
- Case CX330
Engine, hydraulics, and drivetrain
The CX300E runs a Tier 4 Final diesel through a hydrostatic dual-path drivetrain into a steel-track undercarriage. The main hydraulic pump - a load-sensing piston pump - drives boom, dipper, bucket, swing, and propel functions through electrohydraulic control valves. The electrohydraulic system gives the operator fine modulation and the ability to tune work modes through the cab monitor.
Tier 4 Final aftertreatment on the CX300E uses a diesel particulate filter (DPF) combined with selective catalytic reduction (SCR) dosed with diesel exhaust fluid (DEF). Cooled EGR is part of the emissions strategy. These systems are reliable when fed clean fuel and quality DEF, but they add service points that the older D-Series did not have.
Common service items on the CX300E
- Engine internals: Tier 4 Final diesel pistons, rings, sleeves, head gaskets. Common-rail injection components.
- 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 CX300E
| Category | Common Parts | Browse |
|---|---|---|
| Engine | Tier 4 Final diesel internals, pistons, rings, sleeves, gaskets | Browse Engine |
| Aftertreatment | DPF, DEF dosing, SCR catalyst, EGR components | Browse Aftertreatment |
| Fuel System | Common-rail injectors, lift pump, filters, water separators | 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, swing brake | Browse Swing |
| Cab Glass / Wiper | KHN16820 wiper, KHN3046 lower glass, KHN2632 upper glass | Browse Cab Glass |
| Electrical / ECU | ECU, sensors, harnesses, instrument cluster | Browse Electrical |
| Operator Station | Seat, joysticks, pedal linkage, gauges, HVAC | Browse Operator Station |
Need a part for your Case CX300E Excavator?
Tier 4 Final aftertreatment, common-rail fuel system components, and main hydraulic pumps are the highest-value items on a CX300E. Call our parts team with your machine and engine serial numbers.
Request a PartWhat to verify before ordering
- Serial number. Confirm the machine serial 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 CX300E still earns a paycheck
The Case CX300E is a 30-ton class production excavator built for general site work, utility installation, residential and commercial earthmoving, and mining or quarry work depending on configuration. The E-Series chassis pairs proven Case hydraulic architecture with modern engine controls and emissions hardware, and it benefits from CNH’s broad heavy-excavator parts catalog shared with Link-Belt on many service items.
Maintenance priorities on a CX300E: clean fuel and tight water separation for common-rail injection, DPF regeneration behavior tracking, quality DEF for the SCR system, 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.
