Case CX135SR Hydraulic Excavator: 13.5-Ton Short-Radius Utility Machine
The Case CX135SR is a 13.5-ton class short-radius hydraulic excavator built for urban, curbside, and confined-space work where conventional-swing machines won’t fit. The SR tail-swing geometry keeps the counterweight inside the track width, making it a go-to for utility installation and tight-site earthmoving.
Where the CX135SR fits in the Case excavator line
The CX135SR is a 13.5-ton class short-radius excavator sitting between the CX130D and CX140E in Case’s full-size excavator lineup. The SR (short-radius) geometry keeps the counterweight inside the track width, making it ideal for confined-space utility work, curbside jobs, and urban projects where a conventional-swing 13-ton machine would foul on adjacent structures or traffic.
Case CX135SR Excavator - Quick Specs
- Class
- 13.5-Ton Short-Radius Excavator
- Generation
- Original SR
- Engine
- Tier 3 Diesel
- Drivetrain
- Hydrostatic Dual-Path
- Undercarriage
- Steel Track
- Tail Swing
- Short Radius
- Serial Plate
- RH side, lower cab frame
- Smaller Sibling
- Case CX130D
- Larger Sibling
- Case CX140E
Engine, hydraulics, and drivetrain
The CX135SR 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 circuits through electrohydraulic control valves.
The short-radius tail-swing geometry reduces rear counterweight overhang for confined-space work. The tradeoff is slightly lower swing-stability when lifting at full reach compared to a conventional-swing 13-ton class machine, so lift charts and rated operating capacities differ from the standard-tail siblings.
Common service items on the CX135SR
- Engine internals: Tier 3 diesel pistons, rings, sleeves, head gaskets, bearings.
- 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.
- 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 CX135SR
| Category | Common Parts | Browse |
|---|---|---|
| Engine | Pistons, rings, sleeves, gaskets, bearings | Browse Engine |
| 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 | 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 CX135SR Excavator?
Hydraulic components, common-rail fuel system parts, and undercarriage items are the highest-value wear points on the CX135SR. Call our parts team with your serial number.
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.
- 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. Confirm shoe width and track pitch before ordering chain or pad sets.
Why the CX135SR still earns a paycheck
The Case CX135SR is a 13.5-ton class production excavator that handles general site work, utility installation, residential and commercial earthmoving, and quarry work depending on configuration. The short-radius tail-swing geometry adds urban, curbside, and confined-space capability that a standard-tail 13-ton machine simply can’t match.
Maintenance priorities on a CX135SR are clean fuel and tight water separation for common-rail injection, hydraulic oil condition, swing-bearing lubrication, steel-track tension and undercarriage wear monitoring, and pin and bushing service at every boom joint. Broken Tractor maintains parts coverage across the Case excavator family.
