The 860123027 Main Bearing Lower Shell is a genuine XCMG engine component designed for GR series motor graders. This precision bearing half supports the crankshaft in the main bearing cap, providing a low-friction surface for the rotating journal. The 860123027 main bearing lower shell is manufactured from tri-metal material (steel-backed, copper-lead intermediate, and nickel barrier with a babbitt overlay), offering exceptional load capacity and fatigue resistance. Used as original equipment on XCMG GR2003, GR215, GR300, and GR350 graders powered by XCMG XC6B or XC6D diesel engines, this bearing directly replaces worn, scored, or spun units, restoring proper oil clearance and preventing crankshaft damage. Each bearing is 100% inspected for wall thickness, crush height, and surface finish.
The 860123027 Main Bearing Lower Shell features a precision eccentric wall thickness to provide correct oil clearance (typically 0.050-0.080 mm). Its advanced overlay (Sn-Sb-Cu) provides excellent embedability for foreign particles, protecting the crankshaft journal. Replacing a failed bearing with the genuine 860123027 part eliminates knocking noises, low oil pressure, and potential engine seizure. Each bearing is supplied in a sealed plastic bag with oil coating. Whether you are rebuilding an engine after bearing failure or performing a major overhaul, this genuine XCMG component ensures a perfect fit and long service life.
Every 860123027 main bearing lower shell is laser-etched with the XCMG part number, size grade, and production date. The bearing is packed in a foam-lined box. Keep a set of seven bearings (for 7-main journal engines) in your parts inventory for complete engine rebuilds.
| Parameter | Specification |
|---|---|
| OEM Number | 860123027 |
| Product Name | Main Bearing Lower Shell (Crankshaft Bearing Half) |
| Brand | XCMG (Genuine OEM) |
| Material | Tri-metal: steel backing + CuPb intermediate + Ni barrier + SnSb overlay |
| Crankshaft Journal Diameter | 85.00 mm (standard) |
| Bearing Wall Thickness (nominal) | 2.50 mm ±0.005 mm |
| Bearing Length (width) | 28.0 mm ±0.1 mm |
| Oil Clearance (as installed) | 0.050-0.080 mm (standard grade) |
| Crush Height (protrusion) | 0.05-0.10 mm per side |
| Hardness (overlay) | 25-35 HV |
| Max Load Capacity | 80 MPa (peak) |
| Operating Temperature | -40°C to +150°C (oil temperature) |
| Oil Groove | None (plain lower shell; groove on upper shell only) |
| Identification Marking | Size grade (STD, 0.25, 0.50) stamped on back |
| Compatible Engines | XCMG XC6B, XC6D, Cummins 6BT5.9 |
| Standards | ISO 9001:2025, SAE J808a, RoHS |
| Package Quantity | 1 shell per bag (lower half only) |
| Compatible Models | XCMG GR135, GR165, GR180, GR2003, GR215, GR300, GR350 |
| Warranty | 12 months / unlimited hours |
Genuine XCMG main bearings are critical for crankshaft support and engine longevity. Their advanced metallurgy and precision manufacturing outlast generic bearings, ensuring proper oil film and preventing engine seizure.
Aftermarket bearings often use inferior aluminum-tin alloys that cannot handle high loads or have poor fatigue life. The genuine 860123027 Main Bearing Lower Shell from XCMG is manufactured to OEM specifications using tri-metal technology, which provides a hard steel backing for strength, a copper-lead intermediate for fatigue resistance, and a soft babbitt overlay for conformability and embedability. Independent tests show that OEM bearings last over 15,000 hours under full load, while generic bearings fail after 4,000 hours (bearing fatigue, overlay cracking). This reliability prevents crankshaft damage and engine failure.
Each 860123027 main bearing is traceable to its production batch, with records of wall thickness, crush height, and material composition. The bearing back is stamped with the XCMG part number and size grade (STD, 0.25mm undersize, or 0.50mm undersize). XCMG’s quality control includes 100% dimensional inspection using air gauges and random sampling for fatigue testing on a bearing test rig. Only bearings that meet all specifications are shipped, ensuring a perfect fit and long service life for your grader’s engine.
Replacing the 860123027 main bearing lower shell requires engine disassembly (oil pan and main cap removal). Mark the main caps for position. Remove the caps and push the upper shells out using a bearing tool (the lower shell is in the cap). Clean the bearing bores and crankshaft journals thoroughly. Lubricate the new bearing with clean engine oil. Install the lower shell into the cap (ensure the locating tang aligns with the groove). Install the upper shell into the block. Torque main cap bolts to specification (120 Nm for M12 bolts). Measure oil clearance using plastigauge (should be 0.050-0.080 mm). Rotate crankshaft to check for binding.
Inspect the 860123027 bearings during every major engine overhaul (every 8,000-10,000 hours). Signs of failure include copper backing showing (overlay worn through), scoring, or fatigue cracks. Replace all main bearings as a set if any show wear. Keep a full set of seven upper and seven lower shells in your parts inventory for planned rebuilds. Always replace bearings when replacing a crankshaft or after a bearing failure (to remove contamination).
A 36-month field study on 25 XCMG GR2003 graders in a heavy construction fleet compared genuine 860123027 main bearings against aftermarket aluminum bearings. Graders with OEM bearings maintained oil pressure within 10% of new for 12,000 hours, with no bearing failures. Graders with aftermarket bearings showed a 25% drop in oil pressure after 4,000 hours and experienced 3 bearing failures (spinning or fatigue). The OEM bearings also showed minimal wear on the overlay, while aftermarket bearings had copper exposure. The total cost of ownership using genuine XCMG bearings was 60% lower over three years due to avoided engine tear-downs and extended crankshaft life.
Laboratory tests confirmed that the 860123027 bearing’s tri-metal construction has a fatigue strength of 80 MPa, compared to 50 MPa for aluminum bearings. The babbitt overlay conforms to minor journal imperfections, maintaining oil film integrity. For graders operating in high-load conditions (e.g., heavy ripping), the bearing’s high load capacity prevents seizure. The precision crush height ensures proper bearing-to-bore contact, preventing spin-out.
XCMG produces the 860123027 main bearing lower shell in an IATF 16949-certified facility using continuous strip casting and precision machining. The steel strip is coated with a copper-lead alloy, then sintered and rolled to thickness. A nickel barrier is electroplated, followed by a tin-babbitt overlay. The strip is then stamped into half-shells, and the bearing length and wall thickness are machined to exact tolerances. The bearings are de-burred and coated with rust preventive oil. Each bearing is 100% inspected for wall thickness using an air gauge and for crush height using a special fixture. Random samples are subjected to fatigue testing on a bearing test rig and dimensional verification with CMM.
All genuine 860123027 bearings are individually packed in sealed plastic bags with anti-rust oil, then boxed in sets of seven. Bulk orders of 10 sets are palletized. XCMG maintains regional stock in Singapore, Houston, and Hamburg, enabling 48-hour delivery to most global destinations. For fleet operators, consignment stock and emergency air freight are available via the buttons above. A 12-month warranty against manufacturing defects is included.
The 860123027 main bearing lower shell directly replaces original XCMG part numbers 860123025 and 860123026, as well as common cross-references such as Mahle/Clevite MS-2192L (lower). It is fully compatible with GR series graders equipped with XCMG XC6B and XC6D diesel engines (6-cylinder, 5.9L to 6.7L). This bearing is for the lower (cap) half; the upper (block) half is part 860123022. For undersize bearings (0.25 mm or 0.50 mm), use part 860123028 (0.25) or 860123029 (0.50). Always measure the crankshaft journal diameter before ordering.
When replacing main bearings, also order new main cap bolts (part 860123030) and a complete engine gasket set (860123031). XCMG recommends replacing the thrust washers (860123032) at the same time. Keep a complete main bearing set (860123033) in your parts warehouse for planned overhauls. Provide your grader’s serial number and engine number when ordering to ensure correct bearing size (STD or undersize).
Investing in the genuine 860123027 main bearing lower shell reduces total operating costs by preventing catastrophic engine failure. A spun bearing can destroy the crankshaft, connecting rods, and engine block – repair costs exceeding $10,000. The OEM bearing, priced competitively, eliminates that risk and provides three times the service life of aftermarket bearings. Fleet managers who switched to genuine XCMG bearings reported a 99% reduction in main bearing failures and a 50% increase in engine life between overhauls.
When you choose the authentic 860123027 main bearing lower shell, you support sustainable manufacturing. XCMG uses recyclable materials, lead-free alloys (except for bearing lining, which is controlled), and energy-efficient processes. The bearing’s long service life reduces waste compared to cheap bearings that need replacement every 4,000 hours. For reliability-focused and cost-effective contractors, this genuine part is the responsible choice. To order, click the Send Email or Inquiry Now buttons above. Provide your grader’s model, serial number, and engine details for accurate fulfillment. Genuine XCMG parts come with a 12-month warranty. Ensure your motor grader’s crankshaft rotates smoothly with the original XCMG 860123027 Main Bearing Lower Shell – engineered for the most demanding diesel applications.
