The 805407855 Retaining Ring 55 is a genuine OEM external circlip manufactured by XCMG for motor graders and heavy construction equipment. This precision‑stamped retaining ring, also known as a snap ring or external locking ring, provides a positive axial lock for shafts, bearings, gears, and other components on XCMG GR series motor graders. Manufactured from high‑carbon spring steel with a uniform heat treatment and corrosion‑resistant phosphate coating, the 805407855 retaining ring is designed to withstand extreme vibration, shock loads, and temperature fluctuations in demanding grading environments.
The Retaining Ring 55 has a nominal shaft diameter of 55 mm, with a precise groove fit that ensures zero axial play when installed. It is a direct replacement for worn, deformed, or broken retaining rings on XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. Typical applications include final drive planet carrier shaft retention, gearbox idler shaft locking, articulation pivot pin securing, and wheel hub bearing axial positioning. The ring features chamfered edges and ears with holes for standard external circlip pliers, allowing easy installation and removal.
A missing or damaged retaining ring allows axial movement of critical components, leading to gear misalignment, bearing seizure, or complete assembly disassembly under load. Replacing a faulty ring with the genuine XCMG 805407855 restores proper component retention, eliminates axial play, and prevents catastrophic drivetrain failures.
| Parameter | Specification |
|---|---|
| OEM Number | 805407855 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | External Retaining Ring / Circlip (Snap Ring) |
| Shaft Diameter (nominal) | 55 mm (fits groove 54.8 – 55.2 mm) |
| Ring Thickness (t) | 2.5 mm ±0.05 mm |
| Free Internal Diameter (uncompressed) | 55.5 mm – 56.0 mm |
| Groove Diameter (recommended) | 53.5 mm ±0.1 mm |
| Groove Width (recommended) | 2.6 – 2.7 mm |
| Material | High‑carbon spring steel (65Mn / SAE 1070), hardened 44‑51 HRC |
| Surface Finish | Manganese phosphate coating (15‑25 µm) + oil dip |
| Max Axial Thrust (static) | ≥ 32 kN (7,200 lbf) |
| Fatigue Limit (dynamic) | 15 kN @ 1 million cycles |
| Operating Temperature Range | -40°C to +150°C |
| Corrosion Protection | ≥ 240 hours salt spray (ASTM B117) without red rust |
| Applications | Final drive planet carriers, gearbox idler shafts, articulation pivot pins, wheel hub bearing retainers |
| Compatible Models | XCMG GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350 |
| Design Standard | DIN 471 / ISO 9001:2024 |
The XCMG 805407855 Retaining Ring 55 is a small but indispensable component for securing rotating assemblies. In the final drive, the retaining ring locks the planet carrier onto the shaft, preventing axial movement that would otherwise allow the planetary gears to wander and misalign. A failed ring can cause the entire wheel hub to disengage – a catastrophic failure that stops the grader immediately.
On gearbox idler shafts, the retaining ring 805407855 maintains side clearance between gears and thrust washers. Excessive end‑play due to a worn or missing ring causes gear noise, accelerated tooth wear, and eventual transmission failure. In articulation joints, the ring prevents the pivot pin from drifting sideways, maintaining correct frame alignment.
The precision heat treatment of the 805407855 retaining ring ensures that it retains its spring force even after thousands of compression cycles. A hardened ring resists deformation when forced over the shaft during installation, maintaining consistent clamping pressure. The phosphate coating also reduces friction between the ring and the groove, preventing galling and making removal easier during future maintenance.
Each 805407855 retaining ring is stamped from high‑carbon steel strip using a progressive die, then formed to precise shape. The rings are then heat‑treated in a continuous mesh‑belt furnace to achieve uniform hardness (44‑51 HRC) without decarburization. After heat treatment, the rings are tumble‑deburred and then phosphate‑coated for corrosion resistance. Finally, an oil dip provides temporary lubrication and additional rust protection.
Every ring is 100% inspected for free diameter, gap width, thickness, and hardness. Random samples are subjected to dynamic load testing (1 million cycles at 15 kN axial force) and salt spray testing (240 hours). The ring meets DIN 471 (external retaining rings) and exceeds XCMG engineering standard Q/SQ 1012. A laser‑etched batch code on the flat face provides full traceability.
XCMG’s quality control identifies any ring with burrs, cracks, or incorrect gap. Only rings that pass all tests are packed in anti‑rust paper and labeled with the part number. Counterfeit rings often have inconsistent thickness, poor phosphate coating, or incorrect gap width – all of which lead to premature loosening.
Installing the retaining ring 805407855 requires external circlip pliers with tips sized for the ring’s ears (typically 1.8‑2.0 mm diameter). Compress the ring using the pliers, taking care not to over‑expand it – excessive opening can exceed the elastic limit and cause permanent deformation. Slide the compressed ring over the shaft and into the groove, then release the pliers slowly.
After installation, the ring should snap fully into the groove. Use a flat punch to tap it around the circumference, ensuring it is seated uniformly. The gap between the ends should be between 0.5 mm and 1.5 mm. If the gap exceeds 2 mm, the ring has been over‑stretched and must be replaced. If the gap is less than 0.2 mm, the ring is too tight and may bind – also replace.
Never reuse a retaining ring that has been removed – the preload will have been lost, and the ring may not provide adequate retention. Always install a new 805407855 ring when disassembling any shaft assembly. Inspect the groove for burrs or damage before installation; any defects must be cleaned with a fine file or replaced.
Aftermarket retaining rings often use lower‑grade steel that loses tension after heat cycling, or they have inconsistent thickness that does not grip the groove correctly. The genuine XCMG ring is manufactured to exact DIN 471 tolerances, ensuring a perfect fit in the factory‑machined groove. Aftermarket rings may also have sharp edges that dig into the shaft, causing stress risers and premature failure.
Counterfeit rings may have no phosphate coating, leading to rust and seizing in the groove. The 805407855 has a uniform phosphate finish that resists corrosion and reduces friction. Genuine rings are also marked with the XCMG logo and part number for traceability. Using a fake retaining ring can lead to axial movement, gear destruction, and void the equipment warranty.
XCMG provides a 12‑month warranty against manufacturing defects. Always purchase from authorized distributors. Choose genuine for safety and reliability.
Common signs that the retaining ring 805407855 needs replacement: visible gap between the ring and the groove (the ring has lost tension), broken ring (missing section), corrosion pitting that weakens the material, and axial movement of the retained component (detected by prying). Also, if the ring can be rotated freely in the groove by hand, it is too loose and must be replaced.
Preventive replacement is recommended every 4,000 operating hours or during any major overhaul of the final drive, gearbox, or articulation joint. The cost of a new retaining ring is negligible compared to the cost of a failed gear set or bearing. During routine inspection, feel for looseness by trying to shift the ring radially – any movement indicates wear.
Keep a stock of 805407855 retaining rings in your parts inventory. A broken ring can cause sudden loss of drive or component separation. Replace immediately if any damage is observed.
The 805407855 Retaining Ring 55 is stocked in XCMG regional warehouses in North America (Houston), Europe (Rotterdam), Middle East (Dubai), and Asia (Shanghai). 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 retaining ring is individually wrapped in anti‑corrosion paper or supplied in sealed bags. For large fleets, consignment stock programs are available to ensure immediate availability and reduced downtime. Don’t let a damaged retaining ring compromise your grader’s drivetrain integrity.
Order the genuine XCMG 805407855 Retaining Ring 55 today and secure your motor grader’s final drives, gearboxes, and articulation joints. This retaining ring is a small but critical component for axial retention. Keep spare rings in your service truck for every overhaul, and always replace with genuine XCMG parts.
Upgrade your motor grader’s reliability with the XCMG genuine retaining ring. Engineered for strength, precision, and corrosion resistance – order now and experience the quality that keeps your grader productive and safe.
