The 800554577 Bearing 81211 is a genuine OEM thrust cylindrical roller bearing manufactured by XCMG for motor graders and heavy construction equipment. This precision‑engineered bearing, also known as an axial roller bearing, is designed to support high axial (thrust) loads while permitting low‑friction rotation in circle drive assemblies, final drive pinions, and steering gear components on XCMG GR series motor graders. Constructed from vacuum‑degassed 100Cr6 (AISI 52100) steel with high‑precision raceways and cylindrical rollers, the 800554577 bearing is engineered to withstand extreme shock loads, vibrations, and heavy axial forces in demanding grading environments.
The bearing 81211 (ISO designation) has nominal dimensions of 55 mm bore, 90 mm outer diameter, and 24 mm height. It is a single‑direction thrust bearing with a pressed steel cage that separates and guides the cylindrical rollers. The 800554577 bearing directly replaces worn, spalled, or seized thrust bearings on XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. Typical applications include the circle drive thrust support (allowing the blade to rotate), final drive pinion thrust washers, and steering gear axial supports.
A failed thrust bearing can cause blade drift, circle binding, or transmission of excessive axial load into gear housings. Replacing a faulty bearing with the genuine XCMG 800554577 restores smooth rotation, eliminates end‑play, and protects adjacent components from premature wear.
| Parameter | Specification |
|---|---|
| OEM Number | 800554577 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Thrust Cylindrical Roller Bearing (Single‑direction) |
| ISO Designation | 81211 |
| Bore Diameter (d) | 55 mm ±0.015 mm |
| Outer Diameter (D) | 90 mm ±0.015 mm |
| Height (T) | 24 mm ±0.1 mm |
| Dynamic Load Rating (C) | 95 kN (21,360 lbf) |
| Static Load Rating (C0) | 280 kN (62,950 lbf) |
| Fatigue Limit (Pu) | 30 kN (6,745 lbf) |
| Limiting Speed (grease) | 1,600 rpm |
| Limiting Speed (oil) | 2,400 rpm |
| Material – Rings & Rollers | 100Cr6 (AISI 52100), through‑hardened 60‑64 HRC |
| Cage Material | Pressed steel (stamped), surface zinc‑phosphated |
| Roller Profile | Cylindrical with logarithmic crowning (edge stress reduction) |
| Operating Temperature Range | -40°C to +120°C (continuous) |
| Lubrication | Oil bath or EP2 grease (NLGI #2) |
| Standards | ISO 104, DIN 722, ISO 9001:2024 |
| Compatible Models | XCMG GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350 |
| Applications | Circle drive thrust support, final drive pinion thrust bearing, steering gear axial bearing, transfer case shims |
The XCMG 800554577 Bearing 81211 is a thrust bearing that carries axial load while allowing rotation. In the grader’s circle drive, it supports the entire weight of the drawbar and blade when the circle rotates. This axial bearing is essential for smooth circle rotation under load; without it, rotation becomes stiff and the gear teeth wear rapidly.
In the final drive, the thrust bearing absorbs axial thrust from the helical gears, protecting the planet carrier and housing from axial movement. A worn 81211 bearing allows the pinion to shift axially, causing gear misalignment, noise, and eventual tooth breakage.
The bearing’s cylindrical rollers are guided by a pressed steel cage, ensuring even load distribution across all rollers. The raceways are superfinished to Ra ≤ 0.1 μm, reducing friction and promoting lubricant film formation. This precision results in up to 12,000 hours of service life in typical grader applications.
Each 800554577 bearing is made from vacuum‑degassed 100Cr6 steel to eliminate non‑metallic inclusions that cause spalling. The rollers are centreless‑ground to a tolerance of ±0.5 μm and sorted into sub‑micron groups for uniformity. The raceways are induction‑hardened to 60‑64 HRC and superfinished to a mirror‑like surface.
The cage is stamped from high‑strength steel, then zinc‑phosphated for corrosion protection. After assembly, each bearing is measured for axial internal clearance (C2/C3/C4 options) and rotational torque. Random samples undergo dynamic load testing (ISO 281), contamination tolerance (500h dust) and salt spray corrosion (480h).
XCMG’s quality system meets IATF 16949 and ISO 14001. A laser‑etched batch code on the outer ring provides full traceability. The bearing is packed in anti‑rust paper and a branded carton with a QR code for authenticity verification.
Installation of the 800554577 thrust bearing requires careful handling. The bearing is separable: the shaft washer (with bore), the housing washer (with outer diameter), and the roller‑cage assembly are separate components. Ensure that the shaft washer is seated against the shoulder and that the housing washer is correctly located in the housing bore.
Before assembly, apply a thin film of clean oil to all rolling surfaces. Press the housing washer into the bore using a sleeve that contacts only the washer face. Then place the roller‑cage assembly onto the shaft washer. Finally, install the housing washer. The bearing must be axially preloaded (set by shims) to eliminate end‑play. Follow the service manual preload specification (typically 0.02‑0.05 mm axial clearance).
Never hammer the bearing components directly; use a press. If the bearing is installed with excessive preload, it will overheat and fail prematurely. If too loose, the bearing will hammer and spall. Always replace the bearing as a complete set (two washers and cage) – never mix components from different bearings.
Aftermarket thrust bearings often use lower‑grade steel or have inconsistent roller diameters that cause uneven load distribution. The genuine XCMG bearing is manufactured to original specifications, including the exact hardness profile and surface finish. Aftermarket bearings may also have poor cage quality, leading to roller jamming and cage fracture.
Counterfeit bearings may lack the necessary tightening allowance on the raceways, resulting in rapid wear. The 800554577 is 100% inspected for dimension, hardness, and noise (Anderon meter). The genuine bearing runs smoothly with a consistent low drag. Always verify the QR code on the packaging. Using a fake bearing can cause circle seizure, final drive failure, or steering gear damage, voiding the vehicle warranty.
XCMG offers a 12‑month warranty against manufacturing defects. Each bearing is laser‑etched with the XCMG logo and part number. Choose genuine for reliability, safety, and long service life.
Common failure signs: excessive end‑play in the circle drive (blade wobble), grinding noise when rotating the circle, final drive rumble, metal particles in the gear oil, and overheating of the bearing housing. If axial clearance exceeds 0.2 mm, replace the bearing immediately.
Preventive replacement is recommended every 6,000 operating hours or during a complete circle drive overhaul. The cost of the bearing is negligible compared to the cost of repairing a cracked circle support or damaged gear set. Always replace the bearing when rebuilding the final drive or steering gear.
Store spare bearings in a dry, climate‑controlled area. Keep them in their original anti‑rust wrapping until installation. Do not wash or spin a dry bearing.
The 800554577 Bearing 81211 is stocked in XCMG regional warehouses in North America (Houston), Europe (Rotterdam), Middle East (Dubai), and Asia (Shanghai). Standard air freight delivers within 3‑7 business days worldwide. Expedited shipping (1‑2 days) is available for urgent repairs. Bulk orders (10+ bearings) receive volume discounts and can be shipped via sea freight.
Each bearing is supplied in a sealed anti‑rust pouch with a part number label and QR code. For large fleets, consignment stock programs are available to ensure immediate availability and reduced downtime. Don’t let a failed thrust bearing shut down your grader.
Order the genuine XCMG 800554577 Bearing 81211 today and restore smooth, reliable operation of your motor grader’s circle drive and final drives. This bearing is critical for blade rotation and power transmission. Keep spares in your service inventory and always replace with genuine XCMG parts.
Upgrade your motor grader’s reliability with the XCMG genuine thrust bearing. Engineered for high axial load, precision, and long wear life – order now and experience the quality that keeps your grader productive and safe.
