The genuine XCMG 800556048 Steel Balls (16 mm diameter, G10 precision grade, tolerance +4/-0.2 micrometres) are precision rolling elements manufactured for XCMG GR series motor graders. These high‑accuracy steel balls are used in ball bearings, ball screws, check valves, and articulation joint ball studs, providing smooth rotation and load transfer under extreme pressures. Manufactured from vacuum‑degassed chrome steel (SAE 52100) with a hardness of 60–66 HRC, the 800556048 steel balls deliver exceptional rolling contact fatigue life and dimensional stability. Each ball is lapped and polished to a mirror finish (Ra ≤0.02 μm), ensuring minimal friction and noise even under heavy loads.
The 800556048 steel balls have a nominal diameter of 16 mm with a tight grade G10 tolerance (sphericity deviation ≤0.25 μm, diameter variation ≤0.5 μm). The +4/-0.2 micron tolerance band refers to the allowable deviation from nominal diameter (positive 4 microns, negative 0.2 microns), ensuring perfect fit in bearing races and ball pockets. This precision is essential for maintaining preload and reducing vibration in high‑speed rotating applications such as transmission output shafts, final drive pinions, and wheel bearings on GR135, GR165, GR180, GR215, GR260, GR300, GR350, and GR2003 graders.
Worn or out‑of‑tolerance steel balls cause bearing noise, increased friction, and eventual raceway spalling. Replacing degraded balls with genuine XCMG 800556048 restores rolling element geometry, reduces operating temperature, and extends bearing life. Keep these precision balls in stock for bearing rebuilding and ball joint refurbishment.
| Parameter | Specification |
|---|---|
| OEM Number | 800556048 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Precision Steel Ball – Grade G10 |
| Nominal Diameter | 16.000 mm |
| Diameter Tolerance | +0.004 mm / -0.0002 mm (+4 µm / -0.2 µm) |
| Grade (ISO 3290) | G10 |
| Sphericity Deviation | ≤0.25 μm |
| Diameter Variation (batch) | ≤0.5 μm |
| Surface Roughness (Ra) | ≤0.02 μm (mirror polished) |
| Material | Vacuum degassed SAE 52100 chrome steel (GCR15) |
| Hardness | 60–66 HRC (uniform) |
| Heat Treatment | Through‑hardened, martensitic structure |
| Residual Stress | Compressive, shot peened surface |
| Corrosion Protection | Oil film (passivated) – optional coating |
| Operating Temperature Range | -40°C to +150°C (-40°F to +302°F) |
| Dynamic Load Capacity (per ball) | ≈8,500 N (for bearing application) |
| Standards Compliance | ISO 3290, DIN 5401, ABMA Std 10, XCMG Q/XCMG 1108-2023 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, GR2003 |
| Superseded Part Numbers | 800555001, 800555678, 800556000, 800556044 |
The 800556048 steel balls are the rolling elements inside deep‑groove ball bearings, angular contact bearings, and thrust bearings used throughout the motor grader drivetrain. They transmit radial and axial loads between the inner and outer rings while rolling with minimal friction. Worn balls cause rough rotation, increased vibration, and heat generation.
On XCMG GR graders, these 16 mm balls are also used in the articulation joint – a spherical bearing that connects the front and rear frames. The balls allow angular misalignment while maintaining load capacity. In check valves, these precision balls seal against a seat to prevent reverse oil flow in hydraulic circuits.
The G10 grade ensures that every ball is nearly perfectly round, distributing load uniformly across the raceway. Out‑of‑round balls (lower than G100) create point contact stresses that cause rapid spalling. Replacing degraded balls with genuine 800556048 restores smooth operation and extends component life.
XCMG specifies vacuum‑degassed SAE 52100 chrome steel for the 800556048 balls, eliminating microscopic inclusions that can initiate fatigue cracks. The steel is cold‑headed into a rough sphere, then ground in two stages to achieve initial sphericity. Following grinding, the balls are heat‑treated in a controlled atmosphere furnace to 60–66 HRC.
After hardening, the balls undergo lapping and superfinishing processes using abrasive slurries. The final surface finish is Ra ≤0.02 μm – mirror smooth. Each ball is 100% inspected using optical sorting machines that measure diameter, sphericity, and surface defects. Balls outside G10 tolerance are automatically rejected.
Shot peening is applied to induce compressive residual stresses, improving resistance to rolling contact fatigue. The balls are then passivated and oiled to prevent rust during storage. XCMG’s quality system includes random sample testing for hardness, case depth, and corrosion resistance. Every batch of 800556048 meets or exceeds ISO 3290 G10 specification.
When handling new 800556048 steel balls, always wear clean gloves – skin oils can attract contaminants. Inspect each ball for any visible damage such as pits, scratches, or rust. Use a ball gauge or micrometer to verify diameter (16.000 mm +0.004/-0.0002). Reject any ball that exceeds the tolerance.
During bearing reassembly, ensure the raceways are clean and free of debris. Use only new balls – mixing old and new balls of different wear levels will cause uneven load distribution. Lubricate balls with clean bearing grease before inserting into the cage. For articulation joints, pack the ball stud cavity with EP2 grease after ball installation.
Store balls in a sealed, dry container to prevent corrosion. Do not drop or strike balls – surface damage cannot be repaired. For transmission or final drive overhauls, always order enough 800556048 balls to replace all rolling elements in the bearing. Keeping a stock of these precision balls ensures quick turnaround on bearing repairs.
Aftermarket steel balls often use lower‑grade carbon steel (such as 1065) with lower hardness (50–55 HRC) and higher inclusion content, leading to early spalling and raceway damage. Many are grade G100 or worse, with diameter variations of ±5 μm, causing uneven load distribution and noisy bearings.
Counterfeit balls may have poor surface finish (Ra >0.1 μm) that increases friction and heat generation. Some are made from soft steel that deforms under load, changing the bearing’s internal clearance. Genuine XCMG 800556048 balls are consistently G10 with mirror finish, ensuring silent operation and maximum life.
XCMG provides a 12‑month warranty against manufacturing defects. Each lot is traceable with a certificate of conformance. Using genuine balls prevents premature bearing failure and the labor cost of re‑repair. For fleet operators, the marginal additional cost of OEM balls is far outweighed by extended uptime.
Indicators that bearing balls need replacement: audible grinding or rumbling noise, vibration felt through the machine frame, increased running temperature (measured by infrared gun), and metal flake contamination in the oil. If balls are visibly pitted, discolored, or have flat spots, they must be replaced.
Preventive replacement is recommended for all bearings during a major drivetrain overhaul (usually every 4,000–6,000 hours). The cost of a set of balls is insignificant compared to a new bearing or race. Never reuse balls removed from a bearing – they will have developed wear patterns that accelerate raceway failure.
Keep a stock of 800556048 balls in your workshop. When rebuilding a wheel hub or transmission, always install new balls along with new races and cages. Regular oil analysis (particle counting) can detect a rising trend of chrome steel particles, indicating ball wear before failure occurs.
The XCMG 800556048 Steel Balls are stocked in regional distribution centers: Houston (USA), Rotterdam (Netherlands), Dubai (UAE), and Shanghai (China). Standard air freight delivers within 2–5 business days worldwide. Expedited courier (DHL/FedEx) provides 1–2 day delivery for urgent bearing repairs.
Bulk orders (500+ balls) receive volume discounts and can be shipped by sea freight. Each ball is individually separated in anti‑corrosion packaging to prevent contact damage. For large fleets, consignment stock programs ensure immediate availability. Technical data sheets and grade certificates are available upon request.
Don’t let worn bearings compromise your grader’s performance. Order the genuine XCMG 800556048 Steel Balls 16 mm G10 today and restore smooth, reliable rotation in every wheel hub, transmission, and articulation joint. Precision balls are the foundation of bearing life – only OEM quality guarantees the tight tolerances your grader needs.
Upgrade your grader’s rolling element reliability with XCMG genuine steel balls. Engineered for fatigue resistance, sphericity, and mirror finish. Use the buttons above to request a quote or email our parts specialists. Keep your XCMG grader rolling with confidence – choose 800556048 OEM balls.
