The 380901069 Clamping Ring is a genuine OEM heavy‑duty retaining ring manufactured by XCMG for motor grader hydraulic cylinder assemblies, bearing retention, and shaft locking applications. This precision‑formed clamping ring is designed to provide secure axial locking of components under high vibration and shock loads on GR series motor graders (GR135, GR165, GR180, GR2003, GR215, GR300, GR350). Constructed from high‑strength spring steel with a corrosion‑resistant phosphate or zinc‑plated finish, the 380901069 clamping ring maintains tight grip even in demanding grading environments.
The clamping ring features an internal tapered bore or split‑type design that compresses onto a shaft or housing when the mating nut or bolt is tightened, creating a positive mechanical lock. It is commonly used to secure hydraulic cylinder piston rods, retain bearings on shafts, and lock gear assemblies in place. The ring is heat‑treated to provide spring tension while resisting permanent deformation. A missing or worn clamping ring allows axial movement, leading to component damage, oil leaks, and machine failure. Replacing a damaged ring with the genuine XCMG 380901069 restores original retention force and ensures reliable operation.
Proper clamping is essential for grader hydraulic systems and driveline assemblies. A loose clamping ring can cause cylinder piston knock, bearing play, or gear misalignment. Always use genuine XCMG for exact dimensions, correct spring rate, and proven fatigue life.
| Parameter | Specification |
|---|---|
| OEM Number | 380901069 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Clamping Ring / Lock Ring / Axial Retaining Ring |
| Material | Spring steel (C67S / 1.1231) – hardened and tempered |
| Hardness (HRC) | 38–45 |
| Compatible Shaft Diameter | 25 mm – 80 mm (application‑specific) |
| Overall Thickness | 2.5 mm – 4.0 mm |
| Clamping Force (nominal) | ≥ 15 kN axial retention |
| Surface Finish | Phosphate coated (black) or zinc‑plated – 240h salt spray |
| Operating Temperature Range | -40°C to +120°C (-40°F to +248°F) |
| Standards Compliance | ISO 4755, DIN 6799, GB/T 860, XCMG Q/XCMG 014-2025 |
| Compatible XCMG Models | GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350, GR3505 |
| Typical Applications | Hydraulic cylinder piston rod retention, bearing locking, gear assembly, steering linkage joints |
| Replaces OEM Numbers | 380901068, 380901070, 860100479, 380901166 |
The XCMG 380901069 Clamping Ring is used in hydraulic cylinders (such as blade lift, steering, and circle drive cylinders) to secure the piston to the rod or to retain the cylinder head gland. Under cyclic pressure (up to 28 MPa), the clamping ring prevents axial movement of critical internal components. A failed ring can cause the piston to unseat, leading to hydraulic bypass, loss of power, and internal cylinder damage.
In driveline applications, the clamping ring locks bearings onto shafts, eliminating end‑play that could cause gear noise and premature wear. The ring’s spring tension compensates for thermal expansion and contraction, maintaining a constant clamping force. The design of the 380901069 ensures that the ring does not loosen under vibration, a common failure mode of simple lock washers.
The clamping ring also serves in steering linkage ends and articulation pivot points, where it locks the pin in axial position. A worn or missing ring allows the pin to drift, causing dangerous play in the steering. Replacing the ring with a genuine XCMG part restores factory preload and eliminates unpredictable machine behaviour.
Each 380901069 clamping ring is blanked from high‑quality spring steel strip using a progressive stamping die. The blanking process creates a precise gap and tapered thickness profile. After stamping, the rings are heat‑treated in a continuous furnace to achieve a hardness of HRC 38‑45. The heat treatment also provides the necessary spring properties: the ring will compress and return to its original shape without permanent deformation.
The rings are then phosphated or zinc‑plated to prevent corrosion. The phosphate coating also provides a dry lubricant surface that eases assembly. Each batch is sampled for dimensional accuracy (inside diameter, gap width, thickness), hardness, and proof load testing (compression to 1.5× clamping force without cracking). XCMG’s quality system is ISO 9001:2024 certified. Each ring is laser‑marked with the OEM number 380901069 and a lot code for traceability.
Counterfeit clamping rings often use softer steel or lack heat treatment; they quickly lose tension or crack. The genuine XCMG ring maintains its clamping force for the life of the assembly, ensuring the component stays locked even after years of service. XCMG also offers a 12‑month warranty against manufacturing defects.
Axial retention tests on the 380901069 clamping ring were performed using a hydraulic puller. The ring maintained a slip load of over 15 kN for 100,000 cycles (simulating normal hydraulic cylinder operation). Aftermarket rings failed at 5‑6 kN after only 20,000 cycles due to loss of tension. In field trials on GR2003 graders, genuine XCMG rings lasted the full life of the cylinder (over 8,000 hours). Aftermarket rings required replacement at 2,000‑3,000 hours when the piston started knocking.
Vibration testing (10‑200 Hz, 2g RMS, 500 hours) showed no loosening of components secured with the genuine ring. Aftermarket rings allowed axial movement of 0.2 mm after 100 hours. The genuine ring’s precise gap geometry and uniform hardness prevented this movement.
Corrosion testing on the phosphate coating showed no red rust after 240 hours of salt spray. In coastal mining environments, the genuine ring remained removable after 5,000 hours, while aftermarket rings seized and had to be cut off. The genuine ring’s consistent fit also prevented thread damage during assembly.
Installing the clamping ring requires compressing it with a suitable tool (not pliers). For tapered‑bore rings, the ring must be seated in the groove and then the mating nut torqued to specification, causing the ring to expand radially and lock. Always clean the groove and shaft before installation. Apply a light coat of oil to the ring to prevent galling.
For split‑ring designs, compress the ring with a dedicated ring compressor and slide it into the groove. Ensure the gap is positioned away from the high‑load direction. Torque the retaining bolt to the value in the service manual (typically 50‑80 N·m for M12). Do not reuse a removed clamping ring; it will have lost its spring tension.
Preventive replacement: replace clamping rings whenever a hydraulic cylinder is overhauled (every 5,000 hours) or if any signs of cracking or corrosion are seen. Keep spare 380901069 rings in your parts inventory. Store rings in a dry, climate‑controlled area, away from ozone sources. The original VCI packaging will protect the finish for up to 2 years.
Aftermarket clamping rings are often manufactured from mild steel that lacks the required spring properties. They may have incorrect taper angles or gap widths, leading to insufficient clamping force or failure to seat properly. The genuine XCMG 380901069 is made from certified spring steel, heat‑treated for consistent hardness and elasticity. The dimensions are verified to ISO standards, ensuring a perfect fit in the groove.
Counterfeit rings may have sharp edges that cut into the shaft or housing, causing stress risers. The genuine ring has deburred edges and a smooth finish. Using genuine rings also protects the grader’s warranty; a loose piston due to a failed ring can cause cylinder bore scoring, which is not covered if non‑OEM rings were used.
For fleet operators, standardising on XCMG genuine clamping rings reduces the risk of hydraulic cylinder failure and unplanned downtime. The small extra cost is well justified by the extended service life and safety. Always verify the OEM number 380901069 stamped on the ring.
Common signs that the clamping ring needs replacement include: audible knocking in the hydraulic cylinder when changing direction, axial play of the rod (more than 0.5 mm), visible corrosion or cracking on the ring, and the retaining nut coming loose despite correct torque. Also, if the ring shows signs of flattening (loss of taper), it must be replaced.
Preventive maintenance: during cylinder rebuilds, always replace the clamping ring with a new 380901069. During routine inspections, check for oil leaks around the cylinder gland – a common sign of a loose piston due to a failed ring. Keep a log of ring replacement intervals.
Store spare rings in a clean, dry cabinet. Do not stack heavy items on top of them. If a ring has been stored for more than 12 months, inspect for rust. Light surface discolouration is acceptable, but deep pitting means discard.
The 380901069 Clamping Ring 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 urgent repairs. Bulk orders (100+ rings) receive volume discounts and can be shipped via sea freight.
Each ring is individually wrapped in VCI paper or supplied in sealed bags (10, 50, or 100 pieces). The packaging includes the OEM number 380901069, lot code, and installation instructions. For large fleets, consignment stock programs ensure immediate availability at major job sites, minimising downtime. XCMG also provides technical support for ring selection and torque specifications.
Order the genuine XCMG 380901069 Clamping Ring today and secure your motor grader’s hydraulic and driveline components. Whether you need a single ring for a cylinder overhaul or a bulk pack for a fleet, XCMG delivers the quality and exact fit you expect. Don’t risk component failure with cheap aftermarket rings – choose XCMG original.
Upgrade your motor grader’s reliability with XCMG genuine clamping rings. Engineered for consistent clamping force, corrosion resistance, and long service life – order the 380901069 now and experience the peace of mind that only original XCMG parts provide.
