Model Spotlight

Case CX27B Mini Excavator: B-Series 2.7-Ton Zero Tail-Swing Compact

The Case CX27B is a 2.7-ton B-Series mini excavator built for residential construction, utility work, and landscaping where the swing arc has to stay inside the chassis footprint. Tier 4 Final compliant, rubber-tracked, and sized for the tight-quarters jobs where a larger excavator simply will not fit.

BT

Broken Tractor Editorial Team• Updated May 2026• 8 min read

Where the CX27B fits in the Case excavator line

The CX27B is a 2.7-ton class B-Series mini excavator with zero tail-swing geometry, designed so the upper structure stays inside the track width during a full 360-degree rotation. That makes it the right tool for residential construction, utility trenching, irrigation, plumbing service, and landscape work where the swing arc has to stay inside the chassis footprint.

It sits in Case’s compact excavator range between smaller sub-2-ton machines and the larger 3-ton-plus class. The B-Series generation moved the platform onto Tier 4 Final emissions compliance with a small compact diesel, common-rail fuel system, and the DPF/SCR aftertreatment package that defines current-era mini excavators.

Engine, hydraulics, and drivetrain

The CX27B runs a small Tier 4 Final compact diesel driving a hydrostatic dual-path drivetrain with a rubber-track undercarriage. Boom, dipper, bucket, swing, and propel functions all draw from a single-section main hydraulic pump, with electrohydraulic or mechanical pilot control depending on configuration.

Tier 4 Final compliance means the engine carries a diesel particulate filter (DPF) with periodic regeneration cycles, a selective catalytic reduction (SCR) catalyst with diesel exhaust fluid (DEF) dosing, and cooled exhaust gas recirculation (EGR). The compact diesel is common-rail injected, which means clean fuel and tight water separation are non-negotiable for injector life.

The hydrostatic dual-path drive provides independent track control for tight-quarters maneuvering. Rubber-track flotation suits residential and contractor work where a wheeled machine or steel-track unit would damage turf or finished surfaces.

Common service items on the CX27B

• Engine internals: Compact 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: Rubber 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: Cross-fit parts shared with Link-Belt - KHN16820 24-inch wiper blade, KHN3046 front lower glass, KHN2632 front upper glass.
• Operator station: Seat, joystick controls, pedal linkage, instrument panel, cab HVAC.

Parts we carry for the Case CX27B

What to verify before ordering

• Serial number. Confirm the machine serial on the CX27B 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.
• Track type. Rubber-track width and pattern can vary by build - measure existing track before ordering replacements.

Why the CX27B still earns a paycheck

The Case CX27B is sized for compact-excavator duty cycles where a 2.7-ton machine is the right tool - residential landscape, utility, irrigation, plumbing, and any tight-quarters digging where larger excavators will not fit. Modern Tier 4 Final emissions compliance, compact footprint, and rubber-track flotation suit residential and contractor work where a wheeled or larger tracked machine would mark up turf or fail to fit through gates.

Maintenance priorities on a CX27B: clean fuel and tight water separation for common-rail injection, DPF regen behavior tracking, hydraulic oil at temperature with clean filtration, rubber-track tension and wear monitoring, and pin and bushing service at every working joint. Broken Tractor maintains parts coverage across the Case mini excavator family - call with your serial and we will get you fitted.