The genuine XCMG 860517091 Roller Ring is a precision‑manufactured rolling element component designed for XCMG GR series motor graders. This OEM roller ring is used in circle rotation slewing bearings, turntable bearings, and heavy‑duty pivot assemblies where smooth, low‑friction rotational motion is required under high axial and radial loads. Manufactured from case‑hardened bearing steel (SAE 52100) with precision‑ground cylindrical rollers arranged in a circular cage, the 860517091 roller ring provides exceptional load‑carrying capacity, rotational precision, and resistance to wear. The outer and inner raceways are induction‑hardened to 60–64 HRC, ensuring long service life even under continuous oscillation and shock loads encountered in heavy grading applications.
The 860517091 roller ring has a nominal pitch circle diameter of 420 mm (exact as per XCMG drawing), with a roller diameter of 16 mm and a roller length of 32 mm. The full complement of rollers (or caged version) is retained in a precision‑stamped steel cage with integral lubrication channels. The ring is pre‑greased with extreme‑pressure (EP2) lithium grease and equipped with sealing grooves for optional dust seals. This component is a direct replacement for worn or damaged roller rings in the circle rotation gearbox, articulation joint, or blade slewing ring of GR135, GR165, GR180, GR215, GR260, GR300, GR350, and GR2003 graders.
A worn or pitted roller ring causes increased friction, rotational resistance, and audible grinding noise during circle rotation. This leads to inaccurate blade positioning, accelerated wear of the drive pinion, and eventual seizure of the slewing ring. Replacing a failed roller ring with genuine XCMG 860517091 restores smooth, backlash‑free rotation and extends the life of the entire circle drive system. Keep this roller ring in your parts inventory for slewing bearing repairs or complete circle drive overhauls.
| Parameter | Specification |
|---|---|
| OEM Number | 860517091 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Roller Ring – Slewing Bearing / Circular Roller Set |
| Pitch Circle Diameter (PCD) | 420.0 mm (±0.15 mm) |
| Roller Diameter (d) | 16.0 mm (±0.002 mm) |
| Roller Length (L) | 32.0 mm (±0.05 mm) |
| Number of Rollers | 66 (full complement / caged design) |
| Raceway Width (ring section) | 38.0 mm (±0.1 mm) |
| Material – Rollers & Raceways | Vacuum degassed SAE 52100 chrome steel (GCR15) |
| Hardness (rollers & raceways) | 60–64 HRC |
| Cage Material | Pressed steel (SPCC), manganese phosphate coated |
| Dynamic Load Rating (C) | 285 kN |
| Static Load Rating (C0) | 560 kN |
| Limiting Speed (oscillating) | 300 strokes/min (typical for circle rotation) |
| Temperature Range | -40°C to +140°C (-40°F to +284°F) |
| Lubrication | Pre‑greased with lithium EP2 (grease channels integrated) |
| Standards | ISO 3030, DIN 5405, XCMG Q/XCMG 1111-2023 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, GR2003 |
| Superseded Part Numbers | 860517000, 860517088, 860517090 |
The 860517091 roller ring is the core rolling element in the grader’s circle rotation slewing bearing. It supports the entire blade circle assembly while allowing smooth rotation for blade angle adjustments.
A worn or pitted roller ring causes increased torque required to rotate the circle, resulting in poor blade angle control, accelerated wear of the drive pinion and ring gear, and operator fatigue.
The cylindrical roller design provides a line contact that distributes loads over a larger area than ball bearings, giving higher radial and axial capacity for the same envelope size.
Replacing a damaged roller ring with genuine XCMG 860517091 restores smooth, precise circle rotation, reduces gear wear, and extends the life of the entire circle drive system.
XCMG selects vacuum‑degassed SAE 52100 chrome steel to guarantee the absence of oxide inclusions that could initiate fatigue cracks under rolling contact stress.
The rollers are cold‑headed, ground, and lapped to a surface finish Ra ≤0.05 µm, with crowned ends to prevent edge loading. The raceways are induction‑hardened to 60–64 HRC with a case depth of 1.5–2.0 mm.
The steel cage is stamped and heat‑treated, then manganese phosphated for lubricant retention and corrosion protection. The cage design ensures even roller spacing and prevents skewing.
Each roller ring is 100% inspected for roller diameter consistency, cage integrity, and radial clearance. Random samples are fatigue‑tested on a 1,000‑hour rotation test rig. Genuine XCMG roller rings are designed for 8,000+ operating hours under normal grading conditions.
Replacing the roller ring requires separating the circle rotation gearbox. Clean the raceways thoroughly and inspect for pitting or cracking. The raceways must be free of score marks.
Apply a generous amount of EP2 grease to the raceways and to the roller ring. Carefully place the roller ring into the outer race groove, ensuring the cage is not damaged. Install the inner ring or gear using a press.
After assembly, rotate the circle by hand – it should turn smoothly without binding or notching. Torque the retaining bolts to the value in the service manual (typically 180 Nm for M16 bolts).
Keep spare 860517091 roller rings in your shop for circle drive or slewing bearing overhauls. A worn roller ring is often the cause of slow, jerky circle rotation and should be replaced proactively.
Aftermarket roller rings often use lower‑grade bearing steel (e.g., 100Cr6 without vacuum degassing) leading to premature spalling and surface fatigue within 1,500 hours.
Counterfeit rings may have inconsistent roller diameters, causing uneven load distribution, high friction, and eventual seizure in the slewing ring. Many have soft cages that distort under load, allowing rollers to fall out.
The pitch circle diameter of aftermarket rings is often inaccurate, leading to misalignment with the mating gear and accelerated tooth wear. Genuine XCMG rings are precision‑ground to exact PCD dimensions.
XCMG provides a 12‑month warranty against manufacturing defects. Each genuine ring is laser‑etched with the OEM number and batch code. Using OEM roller rings prevents premature circle drive failure and avoids expensive downtime. Choose genuine for reliability.
Audible signs: grinding, rumbling, or clicking noise when rotating the circle, especially under load. Visual signs: metal flakes in the grease, visible pitting on the rollers or raceways, and increased rotational resistance.
Preventive replacement is recommended every 5,000 operating hours or during any major circle drive overhaul. The roller ring is a wear component; ignoring the symptoms will lead to damage of the inner and outer race rings, requiring expensive replacement.
Keep a stock of 860517091 roller rings in your fleet inventory. When replacing the circle drive pinion or gear, always inspect the roller ring and replace it if any wear is visible. A proactive replacement strategy ensures smooth circle rotation and extends gear life.
The XCMG 860517091 Roller Ring is 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 shipping for urgent circle drive repairs. Bulk orders of 5+ rings receive volume discounts and can be shipped by sea freight. Each ring is individually packed in a foam‑lined box with desiccant.
For large fleets, consignment stock programs ensure immediate availability. Technical installation datasheets and torque specifications are available upon request. Our parts specialists can assist with slewing bearing diagnostics.
Don’t let a worn roller ring ruin your circle rotation performance. Order the genuine XCMG 860517091 Roller Ring today and restore smooth, precise blade angle control on your motor grader.
Upgrade your grader’s circle rotation reliability with XCMG genuine roller rings. Engineered for high load capacity, low friction, and long service life. Use the buttons above to request a quote or email our parts specialists. Keep your XCMG grader grading accurately – choose 860517091 OEM roller ring.
