Determine the hole diameter before choosing the torque class
The XR240E and XR280D are positioned very close to each other on the used market, and buyers often ask about both at the same time. The right comparison should start with maximum pile diameter, normal depth and maximum depth, soil and rock strata, casing method, drilling tools, rotary Kelly bar type, site access conditions and production targets. A higher torque class only makes sense when the project and supporting equipment can take advantage of it.
Please send borehole logs if available. If not, describe each layer in order and identify the hardest interval, groundwater conditions, and any boulders or backfill. Also state whether the planned work will use a sand bailer, auger, core barrel, casing, or other attachment. This turns the model comparison into an engineering screening.
Use the current official XR240E information as a reference
XCMG's current XR240E page lists rated rotary torque of 240 kN·m, maximum drilling diameters of 2,200/2,000 mm depending on configuration, and maximum drilling depths of 56/80 m; it does not identify which depth corresponds to which Kelly bar type. The page also lists an operating weight of 84 tonnes. Use these figures as a current configuration reference and check the individual machine's nameplate, installed configuration and applicable documentation.
For the actual machine, verify the nameplate, year, engine, rotary head, crowd system and Kelly bar. Local seller information describes one XR240E as having approximately 5,600 hours; the actual hours and the type and condition of the included Kelly bar still need to be checked against the display, serial-number identification and the physical bar.
Treat XR280D as a purchase of a single machine
XR280D is generally regarded as a higher tier among used XCMG rotary drilling rigs, but archived versions and market configurations differ. Do not infer its exact capability from the model designation, and do not apply current XR280E data. Request the original manual or configuration sheet corresponding to that serial number, and verify the installed Kelly bar and associated tooling.
The practical question is whether the project needs the extra capability typically associated with a larger class. If the work repeatedly approaches the verified limits of the XR240E, the appropriate XR280D may provide useful headroom. If the work stays entirely within those limits, a lighter acquisition can reduce transport, assembly and ownership risk.
Kelly bar selection can matter more than the brand label
When depth in soil and efficient cycling are priorities, friction Kelly bars are often selected. Interlocking Kelly bars transmit crowd force through locking keys and are typically used in harder formations, but they usually involve a trade-off in depth. The number of sections, section length, outer diameter and locking geometry must match the rig and the project.
Check whether the Kelly bar is straight and whether it has dents, welded repairs, wear on the guide strips or wear on the locking keys. Have qualified personnel check whether it telescopes smoothly in accordance with the applicable equipment manual and when equipment and site conditions permit safe operation. Confirm whether the stated maximum depth is theoretical or achievable with the supplied Kelly bar and drilling tools. Replacing or repairing a large Kelly bar can materially change the value of an otherwise attractive rig.
Comparing structure, hydraulics and winches under load
After the exterior inspection, have qualified personnel follow the applicable equipment manual and, when the machine and site conditions permit safe operation, continuously inspect cold start, travel, track extension, mast raising, rotary head operation, crowd movement and main winch lifting, and conduct a drilling or load demonstration when feasible. Record hydraulic temperature, unusual noises, cylinder drift, hose leaks and controller alarms.
- Mast, boom and parallelogram: cracks, reinforcement plates, pin clearance and alignment
- Rotary head: leaks, clearance, mounting condition and operation in available modes
- Main winch: wire rope condition, drum spooling, brake holding and bearing noise
- Undercarriage: extended track length, track pads, track rollers, drive sprockets and frame repairs
- Rotary drilling Kelly bars and tooling: markings, dimensions, wear condition and the exact scope included in the contract
Do the transport calculation before accepting a larger rig
Rotary drilling rigs are usually shipped with the Kelly bar, counterweight or other components removed. Request a packing plan that includes the measured weight and dimensions of each piece, lifting points, crane requirements and loading sequence. Confirm whether special road permits or escort vehicles are needed between the yard and the port, and at the destination.
A larger machine may increase freight costs, ground preparation, assembly time and supporting equipment requirements. Compare the total landed cost of putting the machine into service, including recommissioning, oils, filters, wire rope, bucket teeth, tools and potential initial repair costs.
Information to send for the initial XR240E/XR280D selection
Please provide the hole diameter and depth, geological conditions, rotary drilling Kelly bar preference, casing requirements, country, port, budget, delivery deadline, and any year or emission restrictions. Please state whether the drilling rig must be supplied with Kelly bar, drilling buckets, augers, core tubes, casing tools, and spare parts. Please include the maximum transport restrictions at your site.
GLOBMACH can compare the available XR240E and XR280D machines using the same evidence checklist, listing their suitability, exclusions and points still to verify for the subsequent inspection.
