Case CX370D Hydraulic Excavator: 37-Ton D-Series Tier 4 Final Production Excavator
The Case CX370D is a 37-ton class D-Series hydraulic excavator built around a Tier 4 Final diesel and a load-sensing hydraulic system. It sits between the CX350D and the CX380E in Case’s full-size excavator lineup, targeted at general site work, utility installation, mining, and quarry production.
Where the CX370D fits in the Case excavator line
The CX370D is a 37-ton class D-Series excavator. It sits between the CX350D and the CX380E in Case’s full-size excavator lineup. The D-Series introduced Tier 4 Final emissions controls, refined electrohydraulic control valves, and a modernized cab compared to earlier C-Series machines.
Case CX370D Excavator - Quick Specs
- Class
- 37-Ton Excavator
- Generation
- D-Series
- Engine
- Tier 4 Final Diesel
- Aftertreatment
- DPF + SCR (DEF)
- Drivetrain
- Hydrostatic Dual-Path
- Undercarriage
- Steel-Track
- Tail Swing
- Conventional
- Serial Plate
- RH lower cab frame, below windshield
- Smaller Sibling
- CX350D
- Larger Sibling
- CX380E
Engine, hydraulics, and drivetrain
The CX370D 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 circuits through electrohydraulic control valves. The Tier 4 Final aftertreatment package combines a diesel particulate filter (DPF), selective catalytic reduction (SCR), and DEF dosing for NOx control.
Implement hydraulics are sized for production work in the 37-ton class - bucket curl, dipper crowd, and boom lift forces match the machine’s working class. Swing torque comes through a swing motor and reduction gear riding on a large-diameter swing bearing.
Common service items on the CX370D
- Engine internals: Tier 4 Final diesel pistons, rings, sleeves, head gaskets; 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 CX370D
| Category | Common Parts | Browse |
|---|---|---|
| Engine | Tier 4 Final diesel internals - pistons, rings, sleeves, gaskets | Browse Engine |
| Aftertreatment | DPF, DEF dosing, 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) | KHN16820 Wiper Blade |
| Electrical / ECU | ECU, sensors, harness, instrument cluster | Browse Electrical |
| Operator Station | Seat, joysticks, pedal linkage, gauges, HVAC | Browse Operator Station |
Need a part for your Case CX370D Excavator?
Aftertreatment components, common-rail fuel system parts, and hydraulic main pumps are the highest-value items on a CX370D. 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 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 CX370D still earns a paycheck
The Case CX370D is a 37-ton class production excavator built for general site work, utility installation, residential and commercial earthmoving, and mining or quarry production depending on configuration. It sits in the sweet spot of the full-size excavator class - large enough to move serious dirt, small enough to transport without specialized permitting in most regions.
Maintenance priorities on a CX370D: clean fuel and tight water separation for common-rail injection, DPF regen behavior tracking, DEF quality control, hydraulic oil condition, swing-bearing lubrication, steel-track tension and undercarriage wear monitoring, and pin and bushing service at the working linkage. Broken Tractor maintains parts coverage across the Case excavator family.
