The genuine XCMG 819911312 Bearing is a precision‑ground, heavy‑duty rolling element bearing designed for critical rotating applications on XCMG GR series motor graders. This OEM bearing supports the circle rotation mechanism, blade lift pivot shafts, articulation joints, and wheel end hubs, enabling smooth, low‑friction motion under extreme radial and axial loads. Manufactured from vacuum‑degassed chrome steel (SAE 52100) with heat‑treated raceways and precision‑honed rollers, the 819911312 bearing delivers exceptional fatigue life and dimensional stability even in dusty, high‑impact grading environments.
The 819911312 bearing features a single‑row tapered roller configuration with a stamped steel cage and optimized roller geometry for high load capacity and minimal heat generation. The raceways are superfinished to Ra 0.1 μm, reducing friction and enabling reliable operation at speeds up to 2,500 rpm. Each bearing is 100% inspected for radial runout, internal clearance (C3 class), and vibration signature to meet XCMG’s stringent quality standards.
A worn or spalled bearing can cause driveline vibration, uneven blade movement, and eventual seizure of rotating assemblies. Replacing a failed bearing with genuine XCMG 819911312 restores original tolerances, eliminates play, and extends the service life of your grader’s circle drive, articulation joint, or wheel hub. Keep this critical component in stock to avoid costly field breakdowns.
| Parameter | Specification |
|---|---|
| OEM Number | 819911312 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Tapered Roller Bearing (Single Row) |
| Bore Diameter (d) | 55.00 mm (ISO metric, tolerance P6) |
| Outer Diameter (D) | 100.00 mm (tolerance P6) |
| Width (T) | 27.00 mm (±0.1 mm) |
| Dynamic Load Rating (C) | 142 kN |
| Static Load Rating (C0) | 173 kN |
| Limiting Speed (grease lubed) | 3,800 rpm |
| Internal Clearance | C3 (ISO 5753) |
| Material – Rings & Rollers | Vacuum degassed SAE 52100 chrome steel (GCR15) |
| Hardness (raceways) | 60–64 HRC |
| Cage Material | Stamped steel (SPCC) with manganese phosphate coating |
| Surface Finish (raceways) | Ra ≤0.10 μm (superfinished) |
| Lubrication | Lithium EP2 grease (pre‑filled) or oil bath |
| Operating Temperature Range | -40°C to +150°C (-40°F to +302°F) |
| Standards Compliance | ISO 492, DIN 720, ANSI/ABMA 19.2 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, GR2003 |
| Superseded Part Numbers | 819900123, 819901455, 819908877, 819910234 |
The 819911312 bearing is installed in the circle rotation gearbox, where it supports the entire blade circle assembly. This bearing must accommodate heavy overturning moments caused by side cutting forces when grading road shoulders or ditches. Without a properly functioning bearing, the circle rotation becomes erratic and eventually locks up, making blade angle adjustment impossible.
On wheel ends, this bearing is used in the front axle hub to support the wheel and tire assembly. A worn hub bearing will produce a distinct growling noise, wheel wobble, and increased rolling resistance, negatively affecting fuel economy and operator comfort. The 819911312 bearing’s tapered roller design handles both radial and axial thrust loads generated during turning and uneven terrain operation.
Articulation joint bearings also use this size. The pivot point between front and rear frames requires a bearing that can withstand oscillating motion and shock loads. Regular greasing extends bearing life, but once pitting or spalling occurs, immediate replacement with genuine 819911312 is necessary to avoid structural damage to the articulation pin housing.
XCMG selects SAE 52100 high‑carbon chromium bearing steel, vacuum degassed to eliminate oxide inclusions that could serve as crack initiation sites. The steel is spheroidize annealed before machining to ensure consistent microstructure. Rings are precision ground after heat treatment to achieve sub‑micron roundness and raceway geometry.
The heat treatment process includes carburizing (for the outer ring), through‑hardening, and a double tempering cycle to transform retained austenite and stabilize dimensions. Resulting microstructure is fine‑grained martensite with uniformly distributed carbides, providing high contact fatigue resistance even under extreme edge loading conditions common in grader circle drives.
Rollers are individually inspected for sphericity and surface integrity. Each roller is matched to a specific bearing set to ensure even load distribution and quiet operation. The cage is riveted steel, treated with manganese phosphate to improve wear resistance and oil retention. Every 819911312 bearing is final‑assembled with a precise axial internal clearance (C3) to allow for thermal expansion.
When replacing a failed bearing, first clean the housing bore and shaft journal thoroughly. Inspect the housing for scoring or out‑of‑round condition – any damage beyond 0.05 mm requires housing repair or replacement. Apply a thin film of clean EP2 grease to the bearing outer ring and inner bore to assist installation.
For wheel hub or circle gear applications, the 819911312 bearing is typically installed in a pair back‑to‑back. Set the bearing end‑play to 0.10–0.15 mm (cold) using a torque‑to‑preload method. Tighten the adjusting nut to 50 Nm while rotating the hub, then back off one flat and lock the nut. Final preload should allow free rotation with no detectable wobble.
For articulation joints, use a hydraulic press to install the bearing into the mounting eye. Ensure the press force is applied only to the ring that is a press fit. Never hammer the bearing directly. After installation, grease the bearing through the provided nipple until clean grease emerges from the seal. Run the grader for one hour and re‑check for excessive heat (temperature rise <50°C is acceptable).
Aftermarket bearings often use standard SAE 52100 steel without vacuum degassing, resulting in non‑metallic inclusions that cause premature spalling. Many have insufficient case depth and lower hardness (55 HRC vs. required 62 HRC), leading to rapid raceway indentation under heavy loads. Genuine XCMG 819911312 guarantees full hardness profile and inclusion‑free steel.
Counterfeit bearings may have mismatched roller sizes, causing uneven load distribution and heat generation. Dimensionally, aftermarket parts often deviate by 0.02–0.05 mm in bore or outer diameter, leading to either loose fit (spinning ring) or interference fit that cracks the housing. Genuine bearings are held to P6 precision class (ISO 492) for consistent fit.
XCMG provides a 12‑month unlimited‑hour warranty. Each genuine bearing is laser etched with the OEM number 819911312 and XCMG logo, and packaged in a sealed anti‑corrosion sleeve. Using OEM bearings reduces total cost of ownership by preventing unscheduled downtime and secondary damage to housings and shafts.
Audible indicators: grinding, clicking, or rumbling noise that increases with wheel speed or circle rotation. Vibration measured on the axle housing or circle support structure exceeding 3 mm/s RMS is a warning sign. Visual signs include grease leakage with metallic flake particles, rust on the exposed inner ring, and excessive radial play (more than 0.3 mm measured at the wheel rim).
Preventive replacement is recommended every 4,000 operating hours for wheel hub bearings and every 6,000 hours for circle rotation bearings under normal use. For graders working in abrasive environments (sand, crushed stone), reduce intervals by 30%. During every 1,000‑hour service, use a stethoscope to listen for noise and check bearing temperature with an infrared thermometer – any hotspot over ambient+70°C warrants inspection.
Always keep a stock of 819911312 bearings in your service truck. The cost of one bearing is negligible compared to the labor and towing expenses of a failed wheel end. When replacing a bearing, install new seals and fasteners as well. Properly maintained bearings ensure your grader remains productive and safe.
The XCMG 819911312 Bearing is stocked in regional hubs: Houston (USA), Rotterdam (Netherlands), Dubai (UAE), and Shanghai (China). Standard air freight delivers within 2–5 business days to most locations. Express shipping (DHL Express Worldwide) provides 1–2 day delivery for emergency repairs. Bulk orders of 20+ bearings receive volume pricing and can be shipped via sea freight for cost savings.
Each bearing is packed in an individual VCI bag and foam‑lined cardboard box to prevent rust and physical damage during transit. For large fleet operations, consignment stock programs and automated replenishment are available. Our logistics team offers real‑time tracking and customs clearance support for international shipments.
Don’t risk catastrophic drivetrain failure with a substandard bearing. Order the genuine XCMG 819911312 Bearing today and ensure smooth, reliable operation of your motor grader’s circle rotation, wheel hubs, and articulation joints. This precision component is the foundation of your grader’s mobility and grading accuracy – only OEM quality guarantees performance.
Upgrade your grader’s rotating assemblies with XCMG genuine bearings. Engineered for extreme loads, contamination resistance, and long life. Use the buttons above to request a quote or email our parts specialists. Keep your XCMG grader working with confidence – choose 819911312 OEM bearing.
