Case CX800B Hydraulic Excavator: 80-Ton Tier 4 Final B-Series Flagship
The CX800B is Case’s 80-ton class B-Series hydraulic excavator, built for large production work, mining, and quarry duty. The B-generation brought Tier 4 Final emissions, refined electrohydraulic controls, and a modernized operator station to Case’s full-size excavator flagship.
Where the CX800B fits in the Case excavator line
The CX800B is Case’s 80-ton class B-Series excavator and sits at the top of the Case full-size hydraulic excavator lineup. It succeeded the original CX800 and carries the platform forward to EPA Tier 4 Final emissions with a refined operator station, electrohydraulic controls, and updated cooling and aftertreatment packages.
The B-Series excavators are configured for production-grade applications — large site work, utility installation, mass earthmoving, mining, and quarry duty — with steel-track undercarriages, conventional tail swing, and load-sensing hydraulics sized for big buckets and demanding cycle times.
Case CX800B Excavator - Quick Specs
- Class
- 80-Ton Hydraulic Excavator
- Generation
- B-Series
- Production
- 2021+
- Engine
- Tier 4 Final Diesel
- Drivetrain
- Hydrostatic Dual-Path
- Undercarriage
- Steel Track
- Tail Swing
- Conventional
- Serial Plate
- Right-hand side of lower cab frame, below windshield
- Predecessor
- Case CX800
Engine, hydraulics, and drivetrain
The CX800B runs a Tier 4 Final diesel feeding a hydrostatic dual-path drivetrain into a steel-track undercarriage. The main hydraulic circuit uses a load-sensing piston pump driving boom, dipper, bucket, swing, and propel functions through electrohydraulic control valves. Aftertreatment is DPF plus SCR/DEF for NOx control, with cooled EGR.
The implement and swing hydraulic system is sized for production-class buckets — cylinder bores are large, swing reduction gearing carries substantial loads, and the swing bearing is a serviceable component in its own right. Steel track configurations are standard; the undercarriage is built for sustained operating hours under heavy loads.
Common service items on the CX800B
- Engine internals: Tier 4 Final diesel pistons, rings, sleeves, head gaskets, and common-rail injection components.
- 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 CX800B
| Category | Common Parts | Browse |
|---|---|---|
| Engine | Tier 4 Final diesel internals, pistons, rings, sleeves, gaskets | Browse Engine |
| Aftertreatment | DPF, DEF tank, 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 | KHN16820 Wiper Blade |
| Electrical / ECU | ECU, sensors, harness, telematics | Browse Electrical |
| Operator Station | Seat, joysticks, pedal linkage, gauges | Browse Operator Station |
Need a part for your Case CX800B Excavator?
Tier 4 Final aftertreatment, common-rail fuel system, main pump, and swing components are the highest-value items on a CX800B. Call our parts team with your serial number.
Request a PartWhat to verify before ordering
- Serial number. Confirm the serial on the CX800B 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 CX800B still earns a paycheck
The Case CX800B is an 80-ton class production excavator built for general site work, utility installation, residential and commercial earthmoving, and mining and quarry work depending on configuration. It is the largest excavator Case builds and is sized for jobs where cycle-time and bucket capacity dominate the economics.
Maintenance priorities on a CX800B: 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. Broken Tractor maintains parts coverage across the Case excavator family.
