The genuine XCMG 800370328 Roller Bearing (type NJ213EM/C3) is a high‑precision cylindrical roller bearing manufactured for XCMG GR series motor graders. This OEM bearing is used in transmission output shafts, final drive pinion supports, and differential housings, where it handles high radial loads and accommodates limited axial displacement. Produced from vacuum‑degassed chrome steel (SAE 52100) with precision‑ground raceways and rollers, the 800370328 bearing delivers exceptional fatigue life and dimensional stability under extreme shock loads and continuous high‑speed operation.
The NJ213EM/C3 design features a single rib on the inner ring (NJ type) and a double rib on the outer ring, allowing the bearing to support high radial loads while permitting axial movement of the shaft relative to the housing. The “EM” suffix indicates a pressed brass cage (machined brass) with enhanced guiding and lubrication, while “C3” denotes a radial internal clearance group greater than normal – essential for high‑temperature and high‑load applications in motor grader transmissions.
Applications on XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, and GR2003 graders include the countershaft support in the transmission, the pinion bearing in the final drive, and the differential side bearing. A worn or spalled bearing produces noise, vibration, and eventual drivetrain failure. Replacing a failed bearing with genuine XCMG 800370328 restores original load capacity, reduces friction, and extends transmission life. Keep this critical bearing in your parts inventory for reliable gearbox overhauls.
| Parameter | Specification |
|---|---|
| OEM Number | 800370328 |
| Brand | XCMG (Genuine Original Equipment) |
| Bearing Type | Single‑row cylindrical roller bearing – NJ type (one rib on inner ring) |
| Bore Diameter (d) | 65.00 mm (tolerance P0/ABEC‑1) |
| Outer Diameter (D) | 120.00 mm (tolerance P0) |
| Width (B) | 23.00 mm (±0.12 mm) |
| Dynamic Load Rating (C) | 108 kN |
| Static Load Rating (C0) | 102 kN |
| Limiting Speed (oil/grease) | 6,000 rpm / 4,500 rpm |
| Material – Rings & Rollers | Vacuum degassed SAE 52100 chrome steel (GCR15) |
| Hardness | 60–64 HRC |
| Cage Type | “EM” – machined brass cage (optimized lubrication) |
| Internal Clearance | C3 (ISO 5753) – increased radial clearance |
| Lubrication | Pre‑filled with high‑temperature EP grease or oil bath |
| Temperature Range | -40°C to +150°C (-40°F to +302°F) continuous |
| Standards Compliance | ISO 15, DIN 5412, ANSI/ABMA 19.2, XCMG Q/XCMG 1106-2023 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, GR2003 |
| Superseded Part Numbers | 800369445, 800370100, 800370275, 800370315 |
The 800370328 cylindrical roller bearing is installed on rotating shafts inside the grader’s power transmission system. It supports the countershaft and output shaft in the transmission, and the pinion shaft in the final drive. Unlike ball bearings, the line contact of cylindrical rollers provides much higher radial stiffness and load capacity, essential for handling the high torque generated during grading.
On XCMG GR graders, this bearing is often used in the high‑speed section of the transmission where temperatures can exceed 90°C. The C3 internal clearance allows for thermal expansion without preload increase, preventing smearing and overheating. The NJ design permits axial float of the shaft, accommodating misalignment between transmission case and final drive housing.
A failed bearing will produce a distinct rumble or grinding noise that changes with speed, metal debris in the transmission oil, and axial shaft movement beyond specification. Replacing a damaged bearing with genuine XCMG 800370328 restores original radial runout and extends the life of gears and shafts. Regular inspection during transmission overhauls is essential.
XCMG specifies vacuum‑degassed SAE 52100 chrome steel for the rings and rollers of the 800370328 bearing. This process eliminates microscopic inclusions that can initiate fatigue cracks under rolling contact stress. The steel is then spheroidize annealed to a fine pearlitic structure, ready for precision grinding.
After machining, the rings are austenitized, oil quenched, and tempered to achieve a uniform hardness of 60–64 HRC with a martensitic microstructure. The rollers are grade 10 precision and are individually inspected for sphericity and surface integrity. The raceway curvature is optimized for stress distribution, providing high resistance to subsurface fatigue.
The “EM” brass cage is machined from a high‑strength CuZn alloy, allowing excellent oil flow and low friction. The cage pockets are precisely sized to guide rollers without skew, reducing heat generation. Each bearing is final‑assembled with C3 clearance and 100% tested for noise and vibration on an Anderometer. This quality ensures reliable operation in the demanding environment of a motor grader.
Before installing a new 800370328 bearing, inspect the shaft journal and housing bore for burrs, scratches, or out‑of‑roundness. The shaft should have a surface finish of Ra 0.4–0.8 μm and a hardness of at least 55 HRC. The housing bore should be within ISO H7 tolerance. Clean all components with lint‑free cloth and solvent – do not use compressed air to spin the bearing.
The bearing is typically installed with an interference fit on the rotating shaft (inner ring) and a transition fit in the housing (outer ring). Use an induction heater to warm the bearing to 80–100°C for shaft mounting. Apply force only to the ring being installed – never hammer on the outer ring when pressing onto the shaft. Use a sleeve that contacts the inner ring face.
After installation, rotate the shaft by hand to check for smooth operation – there should be no notching or binding. Apply clean transmission oil to the bearing before final assembly. Install the retaining ring or locknut to the torque specified in the service manual. On high‑speed applications, allow the bearing to run at low speed for 30 minutes to distribute the oil film before full load.
Aftermarket cylindrical roller bearings often use lower‑grade steel with higher inclusion content, leading to premature spalling (surface fatigue) within 2,000 hours. Many have incorrect raceway geometry or roller profile, causing edge loading and heat generation that accelerates grease degradation. Genuine XCMG bearings use premium material and optimized crowning for maximum life.
Counterfeit bearings may have a brass cage made from inferior alloy that cracks under vibration, releasing debris into the transmission. Some have inaccurate internal clearance (often too tight), causing thermal seizure at high speed. Genuine 800370328 bearings are verified for C3 clearance and the cage is ultrasonic‑tested for integrity. Each bearing is packaged in a sealed anti‑corrosion sleeve with the XCMG logo.
XCMG provides a 12‑month warranty against manufacturing defects. Using OEM bearings reduces total cost of ownership by preventing unscheduled transmission repairs and secondary damage to gears and shafts. The small price premium over aftermarket bearings is far outweighed by the reliability and extended service life you receive.
Audible indicators: deep rumbling or grinding noise that increases with shaft speed, especially noticeable when the grader is moving under load. Vibration measured on the transmission housing exceeding 3 mm/s RMS. Visual signs include metallic flakes on the magnetic drain plug, overheating of the bearing area (detectable by infrared thermometer), and axial shaft play greater than 0.2 mm.
Preventive replacement is recommended every 4,000 operating hours for transmission bearings and every 5,000 hours for final drive bearings under normal use. For graders working in severe conditions (dust, high ambient temperatures, heavy load cycles), reduce intervals by 30%. During every 1,000‑hour service, use a stethoscope to listen for bearing noise – a smooth “whir” is normal, but any knocking or irregular sound warrants inspection.
Keep a stock of 800370328 bearings in your fleet workshop. When overhauling a transmission or final drive, always replace all bearings – reusing old bearings is a false economy that leads to repeat failures. A proactive replacement strategy ensures maximum uptime and protects expensive gear sets from catastrophic damage.
The XCMG 800370328 Roller Bearing is stocked in regional redistribution centers: Houston (USA), Rotterdam (Netherlands), Dubai (UAE), and Shanghai (China). Standard air freight delivers within 2–5 business days to most global destinations. Expedited courier (DHL/FedEx) provides 1–2 day shipping for emergency transmission repairs.
Bulk orders of 10+ bearings receive volume pricing and can be consolidated for sea freight. Each bearing is individually packed in a VCI anti‑corrosion bag and placed in a foam‑lined carton to prevent handling damage. For large fleet operations, consignment stock programs and automated replenishment are available. Our parts specialists provide technical support for bearing selection and diagnostic assistance.
Don’t risk transmission failure due to a worn bearing. Order the genuine XCMG 800370328 Cylindrical Roller Bearing NJ213EM/C3 today and restore smooth, reliable power transfer in your motor grader. This precision component is critical for gear alignment and load distribution – only OEM quality guarantees the performance you need.
Upgrade your grader’s drivetrain reliability with XCMG genuine roller bearings. Engineered for high radial loads, thermal stability, and long service life. Use the buttons above to request a quote or email our parts specialists. Keep your XCMG grader transmitting power with confidence – choose 800370328 OEM bearing.
