The genuine XCMG 800551232 Bearing 30310 is a high‑precision tapered roller bearing designed for motor grader final drives, wheel hubs, transmissions, and differential carriers. This OEM 800551232 bearing meets ISO 355 dimensional standards and is manufactured from vacuum‑degassed chromium steel for extended fatigue life under heavy oscillating loads. The 30310 bearing features a separable cone and cup assembly, allowing easy installation and precise axial preload adjustment. Engineered for XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders, the 800551232 bearing supports radial and thrust loads simultaneously.
Proper bearing selection is critical for drivetrain reliability. A worn or spalled 800551232 bearing causes shaft misalignment, gear noise, and eventual seizure. Replacing with genuine XCMG 30310 bearings restores original tolerances and prevents costly component damage.
This tapered roller bearing is also used in steering knuckles, pivot shafts, and circle drive support assemblies. XCMG 800551232 delivers consistent performance under shock loads, high speed, and contaminated lubrication conditions typical of grading applications.
| Parameter | Specification |
|---|---|
| OEM Number | 800551232 |
| Brand | XCMG (Genuine Original Equipment) |
| Bearing Type | Single‑row tapered roller bearing (ISO 355) |
| Boundary Dimensions (d x D x T) | 50 mm × 110 mm × 29.25 mm |
| Inner Diameter (d) | 50.000 mm ±0.012 mm |
| Outer Diameter (D) | 110.000 mm ±0.015 mm |
| Overall Width (T) | 29.25 mm ±0.20 mm |
| Cone Width (B) | 27.00 mm |
| Cup Width (C) | 23.00 mm |
| Material | Case‑carburized steel (SAE 4320 / 20MnCr5) or through‑hardened GCr15 |
| Hardness (Rollers & Races) | 60‑64 HRC |
| Dynamic Load Rating (C) | 132 kN (29,700 lbf) |
| Static Load Rating (C0) | 148 kN (33,300 lbf) |
| Limiting Speed (Grease) | 4,500 rpm |
| Limiting Speed (Oil) | 6,000 rpm |
| Tolerance Class | P0 (ISO 492 normal) – standard; P6 available on request |
| Radial Internal Clearance | C0 (normal) – 0.030 to 0.055 mm |
| Lubrication | Lithium EP grease (NLGI #2) or gear oil splash |
| Operating Temperature | -40°C to +150°C (short peak +180°C) |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 800551189, 800551200, 800551218, 30310J2/Q |
The 800551232 tapered roller bearing supports the pinion shaft in the final drive hub and the differential side gears. It absorbs both radial wheel loads and axial thrust from helical gear forces.
In the transmission, the 30310 bearing locates the mainshaft and countershaft, maintaining gear mesh alignment. A failing bearing causes whining noise, hard shifting, and metal debris in the oil.
The wheel hub also uses this bearing to support the spindle. Worn bearings produce wheel wobble, uneven tire wear, and seal leakage. Replace with genuine 800551232 to restore stable tracking.
Each 800551232 bearing begins with vacuum‑degassed chromium steel, which eliminates microscopic inclusions that cause premature spalling. The rings are heat‑treated to achieve a uniform 60‑64 HRC with a tough martensitic core.
The rollers are precision‑ground to a taper angle within 0.5 arcminutes and sorted by size to ensure even load distribution. The raceways are superfinished to Ra ≤ 0.1 µm, reducing friction and heat generation.
XCMG performs 100% crack detection using eddy current and audits dynamic vibration levels. Each bearing is noise‑tested in a sound‑proof chamber to ensure quiet rotation.
Remove the old bearing using a hydraulic puller. Clean the shaft and housing bore with solvent. Inspect for scoring or galling. Mic the shaft diameter – it must be within 49.988‑50.012 mm.
Press the cone (inner ring) onto the shaft using a sleeve contacting only the race face. Press the cup (outer ring) into the housing using a cup installation tool. Never press through the rollers.
After assembly, adjust axial preload by torque‑tightening the locknut to 80‑100 Nm while rotating the shaft. Back off 30‑45° to achieve 0.02‑0.05 mm endplay. Pack with XCMG high‑pressure grease.
Rumbling or growling noise that changes with speed, excessive axial shaft movement, overheating of the hub or transmission case, and visible rust or pitting on disassembly.
If you find spalled rollers or flaking raceways, replace immediately. Running a damaged bearing can destroy the shaft and housing, increasing repair cost tenfold.
XCMG recommends inspecting bearing condition via oil analysis every 1,000 hours. Detect iron particles above 200 ppm. Replace the 800551232 bearing every 5,000 hours in final drives and wheel hubs.
For transmissions, replace at 6,000‑8,000 hours. Always replace bearings as a matched set (both cone and cup). Never mix old and new components – this leads to rapid failure.
Keep the bearing well‑greased or ensure oil level covers the lower roller. Contaminated oil is the #1 cause of premature bearing wear. Change filters regularly.
Genuine XCMG 800551232 bearings are manufactured in ISO 9001 facilities and come with a 12‑month warranty. Regional stocking points: Houston (USA), Rotterdam (Netherlands), Dubai (UAE), Shanghai (China).
Standard air freight delivers within 3‑7 business days worldwide. Emergency 24‑48 hour shipping available for critical breakdowns. Bulk orders (20+ bearings) receive volume discounts and sea freight options.
Aftermarket bearings often use lower‑grade steel, lack proper heat treatment, or have incorrect taper angles. Genuine XCMG 800551232 ensures precise geometry, full load rating, and long life. Do not risk your drivetrain – order genuine today.
Keep spare 800551232 bearings in your parts inventory. A single failed bearing can stop production for days. Proactive replacement during planned overhauls eliminates unplanned downtime and saves thousands in consequential damage.
Upgrade your motor grader’s reliability with XCMG genuine tapered roller bearings. Precision ground, case‑hardened, and 100% inspected – order the 800551232 Bearing 30310 now and experience quiet, smooth rotation for thousands of hours in the toughest grading environments.
