Case CX57C Mini Excavator: C-Series 5.7-Ton Compact Excavator
The Case CX57C is a 5.7-ton C-Series mini excavator sitting at the useful upper limit of the compact-mini class. Built for utility, contractor, and residential commercial work, it pairs a Tier 4 Final compact diesel with a hydrostatic dual-path rubber-track drivetrain.
Where the CX57C fits in the Case excavator line
The CX57C is a 5.7-ton class C-Series mini excavator - the useful upper limit of the compact-mini class for utility, contractor, and residential commercial work. It sits in Case's compact excavator range as a mid-mini, with smaller and larger siblings flanking it in the C-Series lineup.
Case CX57C Mini Excavator - Quick Specs
- Class
- 5.7-Ton Mini Excavator
- Generation
- C-Series
- Engine
- Tier 4 Final Compact Diesel
- Aftertreatment
- DPF + SCR (DEF)
- Drivetrain
- Hydrostatic Dual-Path
- Undercarriage
- Rubber Track
- Serial Plate
- Right-hand side of lower cab frame, below windshield
- Smaller Sibling
- Case CX50D Mini Excavator
- Larger Sibling
- Case CX60C Mini Excavator
Engine, hydraulics, and drivetrain
The CX57C runs a small Tier 4 Final compact diesel into a hydrostatic dual-path drivetrain with a rubber-track undercarriage. Boom, dipper, bucket, swing, and propel functions run from a single-section main hydraulic pump with electrohydraulic or mechanical control.
The compact Tier 4 Final emissions package combines a diesel particulate filter (DPF) with selective catalytic reduction (SCR) using diesel exhaust fluid (DEF). Common-rail injection demands clean fuel and tight water separation. The hydrostatic dual-path drive provides independent track control with smooth modulation through compact pumps and motors sized for the 5.7-ton class.
Common service items on the CX57C
- 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 (on turbo builds), 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: 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 wipers: 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 CX57C
| Category | Common Parts | Browse |
|---|---|---|
| Engine | Tier 4 Final diesel internals, gaskets, sleeves | 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 | Rubber tracks, rollers, idlers, sprockets | 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 CX57C Mini Excavator?
Common-rail injection, Tier 4 Final aftertreatment, and hydraulic components are the highest-value items on a CX57C. Call our parts team with your serial number and we’ll match the right component to your machine.
Request a PartWhat to verify before ordering
- Serial number. Confirm the serial on the CX57C 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 CX57C still earns a paycheck
The Case CX57C is sized for compact-excavator duty cycles where a 5.7-ton machine is the right tool - residential landscape, utility, irrigation, plumbing, and any tight-quarters digging where larger excavators won’t fit. Modern Tier 4 Final emissions compliance, a 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.
Maintenance priorities on a CX57C: 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.
