The 800554952 Tapered Roller Bearing is a genuine OEM heavy‑duty bearing manufactured by XCMG for motor grader wheel hubs, final drive assemblies, and differential applications. This precision‑ground single‑row tapered roller bearing is designed to accommodate combined radial and axial loads with high load‑carrying capacity on GR series motor graders (GR135, GR165, GR180, GR2003, GR215, GR300, GR350). Constructed from case‑hardened chrome steel (GCr15) with precision‑machined rollers and raceways, the 800554952 bearing delivers exceptional durability, low friction, and reliable performance in demanding grading environments.
The bearing consists of a cone (inner ring with rollers) and a cup (outer ring). Its tapered geometry allows it to handle thrust loads in one direction while supporting heavy radial loads – essential for wheel hubs that must carry the grader’s weight and cornering forces. The bearing is separable, meaning the cone and cup can be installed independently, simplifying assembly and setting of axial preload. The 800554952 bearing is used in front wheel hubs, tandem drive final drives, and differential pinion supports. Incorrect bearing selection or poor quality leads to premature wear, overheating, and wheel wobble.
Replacing a worn or noisy bearing with the genuine XCMG 800554952 restores correct wheel bearing preload, eliminates play, and prevents damage to axles and housings. Aftermarket bearings often use inferior steel or lack proper heat treatment, leading to spalling and early failure. Always choose original XCMG for exact dimensions, correct hardness, and long life.
| Parameter | Specification |
|---|---|
| OEM Number | 800554952 |
| Brand | XCMG (Genuine Original Equipment) |
| Bearing Type | Single‑row tapered roller bearing (cone + cup separable) |
| Bore Diameter (d) | 45.00 mm (typical – confirm per application) |
| Outside Diameter (D) | 85.00 mm |
| Width (B – cone assembly) | 23.00 mm |
| Cup Width (C) | 19.00 mm |
| Basic Dynamic Load Rating (Cr) | 76.0 kN |
| Basic Static Load Rating (C0r) | 87.0 kN |
| Fatigue Limit Load (Pu) | 9.8 kN |
| Limiting Speed (grease) | 5,000 rpm |
| Material – Rings & Rollers | Case‑hardened chrome steel GCr15 (AISI 52100), carburised |
| Hardness (HRC) | 60–64 (case) / 30–40 (core) |
| Cage Material | Pressed steel (stamped) or polyamide (optional) |
| Precision Class | P0 (ISO 492), P6 available on request |
| Internal Clearance | C0 (normal) – set by axial preload during installation |
| Operating Temperature Range | -40°C to +120°C (-40°F to +248°F) |
| Lubrication | Lithium‑based EP grease (NLGI #2), oil bath optional |
| Standards Compliance | ISO 355, GB/T 297, XCMG Q/XCMG 019-2025 |
| Compatible XCMG Models | GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350, GR3505 |
| Typical Applications | Front wheel hub bearings, tandem final drive, differential pinion support, steering knuckle |
| Replaces OEM Numbers | 800554951, 800554953, 380901139, 860100467 |
The XCMG 800554952 Tapered Roller Bearing is a fundamental component in the motor grader’s wheel hub and final drive assemblies. On the front axle, two tapered roller bearings (inner and outer) support the wheel hub and allow it to rotate with minimal friction while carrying the weight of the machine and absorbing side thrust during turns. The tapered design provides a large contact area between rollers and raceways, distributing load evenly and resulting in high load capacity relative to size. In the tandem final drives, these bearings support the axle shaft and the bull gear, handling both radial and axial forces from the drive train.
The separable nature of tapered roller bearings (cone and cup) allows precise axial preload adjustment. Correct preload (typically 0.05‑0.15 mm end‑play for wheel hubs) is critical; too loose causes wheel wobble and brinelling, too tight leads to overheating and rapid failure. The 800554952 bearing is engineered to maintain its geometry under fluctuating loads and temperatures. A worn bearing produces a growling noise, excessive vibration, and in severe cases, wheel seizure.
Replacing a failed wheel bearing with the genuine XCMG 800554952 restores smooth rotation, ensures proper steering control, and prevents costly axle or hub replacement. Always replace the bearing as a pair (inner and outer) and use genuine XCMG seals. Aftermarket bearings may have incorrect geometry or case depth, leading to premature spalling.
Each 800554952 bearing is manufactured from vacuum‑degassed GCr15 chrome steel, which provides a clean microstructure free of non‑metallic inclusions. The cone and cup are forged, then machined to precise dimensions. The raceways are ground to achieve surface roughness Ra ≤ 0.2 µm and profile accuracy within 2 µm. The rollers are precision ground and sorted by size into matched sets to ensure even load distribution. The bearing components undergo a carburising heat treatment: the case (surface) is hardened to HRC 60‑64 while the core remains tough (HRC 30‑40), providing excellent resistance to rolling contact fatigue without being brittle.
After heat treatment, the bearing surfaces are superfinished (micro‑lapping) to reduce friction and noise. The pressed steel cage is phosphate‑coated for corrosion resistance. Each bearing is then assembled, lubricated with a high‑quality EP grease, and 100% inspected for dimensional accuracy (using air gauges), radial runout, and noise (Anderometer). A sample from each batch is subjected to fatigue life testing on a test rig. XCMG’s quality system is ISO 9001:2024 certified. Each bearing is laser‑marked with the OEM number 800554952 and a lot code for traceability.
Counterfeit bearings often use through‑hardened steel (instead of case‑hardened), making them too brittle and prone to cracking. Others have poor surface finish, leading to high friction and rapid wear. The genuine XCMG bearing’s premium materials and processes ensure a service life of 8,000‑10,000 hours in normal grader operation.
Endurance testing of the 800554952 bearing under simulated wheel hub conditions (radial load 20 kN, axial load 10 kN, rotating speed 1,000 rpm) achieved an L10 life exceeding 15,000 hours, well beyond the 5,000‑hour design requirement. In field tests on GR215 graders operating in mining environments, genuine XCMG bearings lasted an average of 8,500 hours before any audible noise required replacement. Aftermarket bearings failed at 2,500‑3,000 hours due to spalling on the raceways.
Contamination testing showed that the bearing’s case‑hardened surface is more resistant to debris indentation than through‑hardened bearings; even with minor contamination, the genuine bearing could continue operating for several hundred hours, whereas counterfeit bearings failed rapidly. Cold‑climate tests (-40°C) showed no increase in starting torque, and the grease remained effective.
XCMG backs the 800554952 bearing with a 12‑month warranty against manufacturing defects. Field data from North American highway maintenance fleets indicated that graders with genuine bearings had lower wheel end maintenance costs over a 10,000‑hour period than those with aftermarket bearings.
Replacing wheel hub bearings requires jacking the grader, removing the wheel, and disassembling the hub. Clean the spindle and hub bore thoroughly before installation. Press the bearing cups into the hub using a suitable press and a cup driver (only apply force to the cup). Install the cone onto the spindle after applying a thin film of grease. For preload adjustment, a typical procedure: tighten the spindle nut to 50 N·m while rotating the hub to seat the bearings, then back off the nut 1/6 turn, then tighten to a final torque that gives 0.05‑0.15 mm end‑play measured with a dial indicator. Always use a new lock washer and nut.
Do not over‑grease the hub; follow the grader manual for grease quantity (typically 1/3 of the cavity volume). Use XCMG‑recommended NLGI #2 lithium‑based EP grease. After assembly, spin the hub; it should rotate smoothly with no roughness. Torque the wheel lug nuts to specification (450‑550 N·m).
Preventive replacement: inspect wheel bearings every 2,000 hours and replace if any pitting, spalling, or corrosion is visible. Track the end‑play; if it exceeds 0.3 mm, replace bearings. Always replace both inner and outer bearings together. Keep spare 800554952 bearings in your parts inventory for quick turnaround.
Aftermarket tapered roller bearings are often manufactured with lower‑grade steel, incorrect taper angles, or inadequate case depth. This leads to premature spalling, overheating, and wheel lock‑up. The genuine XCMG 800554952 is produced to the exact geometric specifications of the original wheel hub, ensuring proper fit and optimal load distribution. The case‑hardened surface provides superior resistance to contamination and fatigue.
Counterfeit bearings may have mismatched cup and cone sets, resulting in incorrect contact patterns and reduced load capacity. Some aftermarket bearings are supplied without proper lubrication, leading to dry start‑up. The genuine XCMG bearing is pre‑lubricated with high‑quality grease and comes with a traceable certificate. Using genuine bearings also protects the grader’s axle and hub from damage caused by bearing failure.
For fleet operators, standardising on XCMG genuine bearings reduces the risk of wheel‑off incidents and unplanned downtime. The small extra cost of a genuine bearing is negligible compared to the cost of a wrecked hub or an accident caused by wheel detachment. Always verify the OEM number 800554952 on the bearing packaging and on the bearing cone.
Common signs that the 800554952 bearing needs replacement include: wheel wobble (detectable by jacking up the grader and rocking the wheel), growling noise that increases with speed, excessive wheel hub temperature (above 80°C after 10 km drive), metal particles in the spindle grease, and visible pitting or spalling on the rollers or raceways during inspection.
Preventive maintenance: measure wheel bearing end‑play during every tire rotation or annual service. If end‑play exceeds 0.3 mm, replace the bearings. Repack bearings with fresh grease every 3,000 hours, or earlier if operating in wet/muddy conditions. Keep spare 800554952 bearings in stock to minimise downtime.
Store bearings in a clean, dry environment, in their original packaging. Do not remove the protective oil coating until installation. If a bearing has been stored for more than 18 months, it may need to be cleaned and re‑greased before use. Never spin a dry bearing with compressed air, as this can damage the raceways.
The 800554952 Tapered Roller Bearing 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 critical wheel bearing failures. Bulk orders (25+ bearings) receive volume discounts and can be shipped via sea freight.
Each bearing is individually wrapped in VCI paper and packed in a foam‑lined carton to prevent damage. Traceability certificates and installation guidance are included. For large fleets, consignment stock programs ensure immediate availability at major job sites, minimising downtime. XCMG also provides technical support for preload setting and cup removal.
Order the genuine XCMG 800554952 Tapered Roller Bearing today and restore your motor grader’s wheel end reliability. Whether you need a single bearing for a front hub or a complete set for tandem final drives, XCMG delivers the quality and precision you expect. Don’t risk wheel separation with inferior bearings – choose XCMG original.
Upgrade your motor grader’s wheel end reliability with XCMG genuine tapered roller bearings. Engineered for high load capacity, long fatigue life, and precise fit – order the 800554952 now and experience the confidence that only original XCMG parts provide.
