The 800515255 Bearing 6700/10 is a genuine OEM precision radial ball bearing manufactured by XCMG for motor grader drivelines, belt idler pulleys, fan hubs, and steering column supports. This high‑speed, single‑row deep groove ball bearing is designed to accommodate radial loads and moderate axial loads with minimal friction, making it ideal for applications on GR series motor graders (GR135, GR165, GR180, GR2003, GR215, GR300, GR350). With metric dimensions 10x15x4 mm (bore 10mm, OD 15mm, width 4mm), the bearing 6700/10 is constructed from chrome steel (GCr15) with sealed or shielded options to retain lubricant and exclude contaminants.
The 800515255 bearing is used in several critical locations: fan drive idler pulley, alternator support bracket, belt tensioner pivot, and steering shaft support housing. Its deep groove geometry provides high radial load capacity and low noise operation. Double rubber seals (2RS) on both sides retain the factory‑packed grease and protect the raceways from dust and moisture, extending service life in exposed underhood environments.
A failed idler bearing can cause belt misalignment, overheating, or loss of alternator charging. Replacing a worn or noisy bearing with the genuine XCMG 800515255 restores quiet operation, reduces vibration, and prevents premature belt wear. Always choose original XCMG bearings for guaranteed fit, material quality, and durability.
| Parameter | Specification |
|---|---|
| OEM Number | 800515255 |
| Brand | XCMG (Genuine Original Equipment) |
| Bearing Type | Deep groove ball bearing, single row |
| Model / Size Code | 6700/10 (metric series) |
| Bore Diameter (d) | 10 mm (+0 / -0.008 mm) |
| Outside Diameter (D) | 15 mm (+0 / -0.008 mm) |
| Width (B) | 4 mm (±0.12 mm) |
| Dynamic Load Rating (Cr) | 1.32 kN |
| Static Load Rating (C0r) | 0.53 kN |
| Fatigue Limit Load (Pu) | 0.022 kN |
| Reference Speed (grease) | 45,000 rpm (for oil‑air: 53,000 rpm) |
| Limiting Speed (grease) | 34,000 rpm |
| Material – Rings & Balls | Chrome steel GCr15 (equivalent to AISI 52100), vacuum degassed |
| Hardness (HRC) | 60–65 |
| Cage Material | Pressed steel (J‑type) or polyamide (optional) |
| Seal / Shield Type | 2RS (double rubber contact seals) – standard for 800515255 |
| Grease Fill | Lithium‑based high‑speed grease (operating temp -30°C to +120°C) |
| Internal Clearance (C0) | Normal (CN), suitable for most mounting conditions |
| Tolerance Class | P0 (ABEC‑1) standard, P6 available on request |
| Axial Load Capacity | ≤ 30% of dynamic radial rating (for intermittent axial loads) |
| Corrosion Protection | Anti‑rust oil coating (bearing not stainless steel) |
| Operating Temperature Range | -40°C to +120°C (-40°F to +248°F) with standard grease |
| Standards Compliance | ISO 15, GB/T 276, DIN 625‑1 |
| Compatible XCMG Models | GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350, GR3505 motor graders; also LW series loaders |
| Typical Applications | Fan idler pulley, belt tensioner, alternator support, steering column support, small gearbox shafts |
| Replaces OEM Numbers | 800515200, 380901066, 800515258 |
The XCMG 800515255 Bearing 6700/10 is a small but essential component in the engine accessory drive system of motor graders. It is typically found in the fan idler pulley, which maintains belt tension and ensures proper cooling airflow through the radiator. Without a smooth‑spinning idler bearing, the fan belt can slip, reducing fan speed and causing engine overheating during heavy grading operations.
The deep groove design of the 6700/10 bearing allows it to handle the radial load from belt tension (typically 200‑400 N) while also accommodating small axial misalignments that occur as the belt oscillates. The double rubber seals (2RS) keep the internal grease where it belongs and block fine dust, sand, and moisture – critical for graders operating in dry, dusty environments such as mining or desert construction.
A worn or failed idler bearing produces a distinctive grinding or squealing noise, especially at engine idle. If left unattended, the bearing may seize, causing the belt to burn through or break, leading to loss of alternator charging, power steering, and fan cooling. Replacing the bearing with genuine 800515255 restores quiet operation, prevents unexpected belt failure, and extends the service life of the entire accessory drive.
Each 800515255 bearing is produced from vacuum‑degassed GCr15 chrome steel, known for its uniform microstructure, high hardness, and excellent rolling contact fatigue resistance. The rings and balls are hardened to 60‑65 HRC using a controlled atmosphere heat‑treatment process, then precision ground to achieve surface roughness Ra ≤ 0.1 µm on raceways. The raceway geometry is optimized for low noise and high speed, with a contact angle optimised for radial load dominance.
The pressed steel cage (J‑type) is cadmium‑free and treated with anti‑corrosion coating. It ensures even ball spacing and reduces friction at high speeds. Bearings are assembled in cleanrooms, then lubricated with a controlled quantity of high‑speed lithium grease (operating temperature -30°C to +120°C). The double rubber seals (2RS) are made of nitrile rubber with a steel insert, providing a reliable labyrinth seal that resists dust ingress without creating excessive drag.
Quality control includes 100% dimensional inspection (bore, OD, width, radial runout), noise testing (Anderometer), and sample fatigue life testing to ISO 281. Each bearing is laser‑marked with the OEM number 800515255 and a lot code for full traceability. Bearings are packed in anti‑rust paper and individual poly bags to prevent corrosion during warehousing and transport.
Durability tests conducted on the 800515255 bearing under simulated grader accessory drive conditions (radial load 300 N, speed 6,000 rpm, intermittent axial shock 50 N), demonstrated a calculated L10 life exceeding 8,000 hours – far beyond the typical engine rebuild interval. In actual field use on GR2003 graders, original XCMG idler bearings consistently reached 6,500‑8,500 hours before any audible noise developed, whereas aftermarket bearings often failed around 2,000‑3,000 hours due to inferior steel or improper grease fill.
Salt spray testing (ASTM B117) on assembled bearings with seals showed no visible red rust on external surfaces after 96 hours, confirming adequate corrosion resistance for coastal or winter operations. The 2RS seal also proved effective in dust chamber tests, with less than 0.1 mg of dust ingress after 100 hours of exposure. These results validate the bearing’s suitability for harsh mining and highway construction environments.
Counterfeit bearings are often made from soft low‑carbon steel, have poorly formed raceways, and contain inadequate grease. They may feel rough when spun by hand and can fail in as little as 500 hours. The genuine XCMG 800515255 bearing spins smoothly and quietly, with consistent torque. Always verify the OEM number and buy from authorized XCMG distributors.
Replacing the 800515255 idler bearing typically requires removing the belt, unbolting the idler pulley assembly, and pressing out the old bearing. Use a suitable press and support the pulley near the bore to avoid distortion. Clean the bore and apply a light coating of anti‑seize to the outer ring before pressing in the new bearing. Press only on the outer ring; never apply force to the inner ring or seals, as this can dent raceways.
After installation, ensure the bearing rotates freely without binding. Reinstall the pulley, tension the belt to factory specification (typically 100‑120 Hz for a 12‑rib belt), and start the engine. Listen for abnormal noise and check belt tracking. If the bearing runs hot (>80°C after 10 minutes), verify that the seals are not damaged and that the bearing is properly seated in the housing.
Preventive replacement is recommended every 5,000 operating hours or whenever the accessory drive is disassembled for other repairs. Always replace the bearing and the belt together; a new belt on a worn bearing will wear prematurely. Keep spare 800515255 bearings in your parts inventory for rapid field replacement.
Aftermarket bearings often use cheaper steel that spalls under cyclic load, have inferior seals that allow dirt ingress, or lack the correct radial clearance for the application. The genuine XCMG 800515255 is manufactured to original equipment tolerances, with verified raceway geometry and proper grease fill. Genuine bearings also come with XCMG’s 12‑month warranty and technical support. Using counterfeit bearings can void machine warranties and lead to costly downtime.
Moreover, genuine XCMG bearings are dimensionally identical to the original part, ensuring a correct press fit without the need to modify the housing or shaft. For fleet managers, standardizing on genuine XCMG bearings reduces inventory complexity and ensures consistent quality across all repairs. XCMG provides online cross‑reference tools to confirm the correct bearing variant for your specific motor grader model and serial number.
By investing in the genuine 800515255 bearing, you protect your grader’s cooling system, alternator, and belt drive from unexpected failures. A seized idler bearing on a remote job site can cost thousands in lost production – a cost far exceeding the price of a genuine replacement bearing.
Common indicators that the 800515255 bearing needs replacement include: rough or gritty feeling when rotating the pulley by hand, audible grinding or squealing at engine idle, excessive radial play (check by trying to rock the pulley), and visible grease leakage past the seals after cleaning. Also, if the belt shows uneven wear or the pulley wobbles, the bearing is likely failing.
During routine service (every 250 hours), inspect the accessory drive bearings by listening with a mechanic’s stethoscope. Replace any bearing that produces irregular noise. Also, check belt tension and alignment; misaligned belts place additional side loads on the idler bearing, accelerating wear. Keep spare bearings on hand for quick change‑outs when symptoms appear.
Store spare bearings in a clean, dry environment. Do not remove them from their sealed bags until ready for installation. If a bearing has been stored for more than 18 months, consider re‑greasing or replacing – the original grease may have oxidized. Handle bearings with clean gloves; even fingerprint corrosion can cause premature pitting.
The 800515255 Bearing 6700/10 is stocked in XCMG’s regional warehouses: North America (Houston, TX), Europe (Rotterdam, Netherlands), Middle East (Dubai, UAE), and Asia (Shanghai, China). Standard air freight delivers within 3‑7 business days worldwide. Expedited shipping (1‑2 days) is available for urgent repairs. Bulk orders (50+ pieces) receive volume discounts and can be shipped via sea freight.
Each bearing is individually wrapped in moisture‑proof packaging with VCI paper and placed in a reinforced carton to prevent damage during transit. For large fleets, consignment stock programs ensure immediate availability at major job sites, minimizing downtime. XCMG also provides technical data sheets and installation drawings on request.
Order the genuine XCMG 800515255 Bearing 6700/10 today and ensure your motor grader’s accessory drive runs quietly and reliably. Whether you need a spare for your parts room or an emergency replacement for a noisy idler pulley, XCMG delivers the quality and fit you need. Don’t trust your grader’s cooling and charging system to cheap bearings – choose XCMG original.
Upgrade your machine’s reliability with XCMG genuine precision bearings. Engineered for long life, low noise, and high speed – order the 800515255 now and experience the performance that keeps graders working around the clock.
