Case CX350B Hydraulic Excavator: 35-Ton B-Series Production Excavator
The Case CX350B is a 35-ton class B-Series hydraulic excavator, sitting between the CX330 and CX350C in Case's full-size excavator lineup. It pairs a Tier 3 diesel with a load-sensing hydraulic system and a steel-track undercarriage built for production earthmoving.
Where the CX350B fits in the Case excavator line
The CX350B is a 35-ton class B-Series excavator, slotted between the CX330 and the larger CX350C in Case's full-size excavator lineup. The B-Series carried the platform forward from the original CX-series machines with refined hydraulics, an updated cab, and a Tier 3 diesel paired to a load-sensing main pump that smooths combined boom-swing-dipper-bucket motion under load.
Case CX350B Excavator - Quick Specs
- Class
- 35-Ton Excavator
- Generation
- B-Series
- Engine
- Tier 3 Diesel
- Drivetrain
- Hydrostatic Dual-Path
- Undercarriage
- Steel Track
- Tail Swing
- Conventional
- Smaller Sibling
- Case CX330
- Larger / Next Gen
- Case CX350C
Engine, hydraulics, and drivetrain
The CX350B runs a Tier 3 diesel through a hydrostatic dual-path drivetrain into a steel-track undercarriage. The main hydraulic pump - typically a load-sensing piston pump - drives boom, dipper, bucket, swing, and propel functions through electrohydraulic control valves. The swing system uses a dedicated swing motor and reduction gear riding a large-diameter swing bearing.
The cab is a sealed-and-pressurized operator station with joystick controls, full instrumentation, and HVAC. Many B-Series machines were equipped with telematics modules for fleet customers.
Common service items on the CX350B
- Engine internals: Pistons, rings, sleeves, head gaskets, bearings for the Tier 3 diesel.
- 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, harnesses, 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 CX350B
| Category | Common Parts | Browse |
|---|---|---|
| Engine | Pistons, rings, sleeves, gaskets, bearings | Browse Engine |
| 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 (Case/Link-Belt cross-fit) | KHN16820 Wiper Blade |
| Electrical / ECU | ECU, sensors, harnesses, instrument cluster | Browse Electrical |
| Operator Station | Seat, joysticks, pedal linkage, gauges | Browse Operator Station |
Need a part for your Case CX350B Excavator?
Main pump, swing motor, undercarriage, and engine internals are the highest-value items on a CX350B. Call our parts team with your serial number.
Request a PartWhat to verify before ordering
- Machine serial number. Confirm the serial on the CX350B 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.
- 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.
- Undercarriage configuration. Track shoe width and link count vary across configurations.
Why the CX350B still earns a paycheck
The Case CX350B is a 35-ton class production excavator built for general site work, utility installation, residential and commercial earthmoving, and mining and quarry work depending on configuration. The B-Series Case excavator platform earned a reputation for hydraulic responsiveness and operator comfort, and well-maintained CX350Bs remain in active production fleets today.
Maintenance priorities on a CX350B: clean fuel and tight water separation for common-rail injection, hydraulic oil condition and filter discipline, swing-bearing lubrication, steel-track tension and undercarriage wear monitoring, and pin / bushing service at every boom and dipper joint. Broken Tractor maintains parts coverage across the Case excavator family.
