The 800370331 Retaining Ring For Bore (size 120×4 mm, DIN472) is a genuine XCMG internal circlip designed for motor grader housings, transmission cases, final drive hubs, and bearing bores. This precision‑formed retaining ring secures bearings, gears, and other components inside a 120 mm diameter bore, preventing axial movement while allowing rotational freedom.
Manufactured from high‑carbon spring steel with a corrosion‑resistant zinc‑phosphate finish, the 800370331 internal retaining ring withstands high axial loads, vibration, and thermal cycling on XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders.
A missing, cracked, or weakened retaining ring allows bearings or gears to shift axially within the housing, causing catastrophic damage to the final drive, transmission, or wheel hub. Replacing a worn or lost circlip with the genuine XCMG 800370331 restores proper axial retention and prevents expensive drivetrain failure.
The 800370331 conforms exactly to DIN 472 specifications: a nominal bore diameter of 120 mm, a ring thickness (material section) of 4 mm, and a gap that allows installation with standard internal circlip pliers. The tapered cross‑section ensures the ring seats firmly into the machined groove inside the housing, providing reliable axial location even under extreme vibration and shock loads.
Common applications on GR graders include retaining the planetary gear carrier bearings inside the final drive hub, securing transmission output shaft bearings, and locking bearings in the tandem drive housing. The 800370331 internal ring is made from C67S or SAE 1075 spring steel, heat‑treated to 44‑51 HRC for optimal elasticity and strength.
Using genuine XCMG 800370331 guarantees correct material hardness, edge break, and gap dimensions – critical for safe and long‑lasting retention. Never reuse a circlip that has been removed, as spring tension is lost. Always install a new genuine XCMG retaining ring during any bearing or gear replacement inside a bore.
Order the genuine XCMG retaining ring today to keep your grader’s rotating assemblies secure and failure‑free.
| Parameter | Specification |
|---|---|
| OEM Number | 800370331 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Internal Retaining Ring / Circlip (DIN 472) |
| Nominal Bore Diameter | 120 mm |
| Ring Thickness / Wire Section | 4.0 mm (±0.07 mm) |
| Groove Diameter (min) | For 120 mm bore: groove diameter approx. 115.8 ±0.15 mm |
| Free Inside Diameter (installed) | 117.5 mm ±0.6 mm |
| Material | Spring steel (C67S / 1.1231 / SAE 1075) |
| Hardness | 44 – 51 HRC |
| Surface Finish | Zinc‑phosphate + oil dip, 240h salt spray |
| Standard | DIN 472 (ISO 4720), XCMG Q/XCMG 159-2022 |
| Maximum Axial Load (static) | Approx. 25 kN (depends on groove strength) |
| Operating Temperature Range | -40°C to +150°C (-40°F to +302°F) |
| Installation Tool | Internal circlip pliers with 2.5 mm tip diameter |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 800370299, 800370315, 800370355 |
The XCMG 800370331 Retaining Ring For Bore is a small but mission‑critical component that prevents bearings, gears, and other components from sliding axially out of their housings.
In the grader’s final drive hub, this internal ring holds the planetary bearing outer races against the hub shoulder. If the ring fails or dislodges, the bearing can shift, causing gear misalignment and catastrophic gear breakage.
On the transmission output shaft bearing, the 800370331 is installed in a groove inside the housing to retain the bearing outer race. A lost or broken ring allows the bearing to walk out, damaging seals and causing rapid oil leakage.
Without a properly seated circlip, axial play increases, leading to vibration, noise, and eventual component walk‑out. The 800370331 ensures precise axial location even under high shock loads from ripping and pushing.
XCMG engineers specify this internal ring for all 120 mm bore applications where heavy side loads exist. Its taper‑ground edges ensure full contact with the groove flank, maximizing retention force.
Each 800370331 retaining ring is produced from cold‑rolled C67S spring steel strip, precision stamped to DIN 472 tolerances.
After stamping, the rings are deburred in a tumbling process to remove sharp edges that could damage housing grooves or installer hands.
The rings then undergo a heat treatment process: austenitizing, oil quenching, and tempering to achieve 44‑51 HRC.
This hardness provides the perfect balance of elasticity (to compress during installation) and strength (to resist permanent deformation under load).
A zinc‑phosphate coating is applied, followed by a light oil dip to provide corrosion resistance up to 240 hours salt spray.
XCMG’s quality control includes 100% visual inspection for cracks, dimensional checks using GO/NO‑GO gauges, and sample proof‑load testing.
Every genuine 800370331 is laser‑marked with the XCMG logo and part number for traceability.
Counterfeit rings often use low‑carbon steel that deforms permanently after the first removal, or they lack proper heat treatment, leading to breakage.
Only genuine XCMG rings guarantee the exact gap dimension, edge break geometry, and spring constant required for safe housing retention.
Installing a new 800370331 retaining ring requires the correct internal circlip pliers with 2.5 mm diameter tips.
Before installation, inspect the housing groove for burrs, wear, or corrosion. Clean the groove with a wire brush and degreaser.
Compress the ring using pliers, then lower it into the bore and release it into the groove. Ensure the ring fully snaps into the groove – it should rotate slightly but not lift out.
Never reuse a circlip that has been removed; the expansion and contraction permanently reduce its clamping force.
After installation, verify that the ring sits flush against the groove’s thrust face. If gaps are visible, the ring may be incorrect or the groove damaged.
For final drive or transmission bearings, always replace the retaining ring whenever bearings are replaced inside that housing.
XCMG recommends keeping a supply of 800370331 rings in your parts cabinet for all planned overhauls involving bores of this size.
Never attempt to weld or repair a cracked ring – only genuine replacement guarantees safety and reliability.
Aftermarket retaining rings often have inconsistent cross‑section thickness, causing poor fit in the groove and reduced retention force.
Many generic circlips are made from soft, unhardened steel that bends open permanently under load, allowing components to slide out.
Counterfeit rings may also have sharp, untumbled edges that cut into the housing groove, creating stress risers that can lead to housing cracking.
The genuine XCMG 800370331 is manufactured to exact DIN 472 dimensions with a smooth, consistent taper and uniform gap.
Its heat treatment ensures it can be compressed repeatedly (during assembly) without taking a permanent set, yet retains full clamping force once installed.
Using genuine XCMG also simplifies warranty claims – dealers recognize authentic parts and cover defects for 12 months.
For fleet managers, the extra cost of genuine rings is negligible compared to the downtime and damage a failed aftermarket ring can cause.
Protect your grader’s drivetrain – insist on XCMG genuine 800370331 retaining rings.
Signs that the 800370331 retaining ring needs replacement include: visible cracking or notches, a loose fit in the groove (ring rotates without resistance), or evidence of rust pitting.
If the ring can be removed by hand without pliers, it has lost its spring tension and must be replaced.
During routine axle or transmission service, always install a new ring – never reuse the old one even if it looks fine.
Preventive replacement is recommended every 5,000 operating hours or whenever the associated bearing or gear is replaced.
The cost of a genuine 800370331 ring is minimal compared to the cost of a final drive rebuild after a bearing walks out.
Keep a stock of at least three rings in your parts inventory – they are often needed during unplanned axle seal repairs.
During installation, always wear safety glasses – compressed rings can fly off if pliers slip.
A properly retained component inside a bore is a quiet, efficient component. Replace suspect rings immediately.
The 800370331 Retaining Ring is stocked in XCMG’s global parts hubs: North America (Houston), Europe (Rotterdam), Middle East (Dubai), and Asia (Shanghai).
Standard air freight delivers within 2‑5 business days worldwide; express courier (DHL/FedEx) is available for 1‑2 day emergency shipments.
Bulk orders (50+ rings) can be shipped via sea freight with volume discounts. Each ring is individually sealed in an anti‑corrosion paper envelope.
For large fleets, XCMG offers consignment stock programs – rings are stored on‑site and billed as used, eliminating waiting times.
Don’t let a missing or broken retaining ring compromise your grader’s final drive or transmission. The genuine 800370331 provides secure, reliable bore retention for thousands of hours.
Order today and ensure your bearings and gears stay exactly where they belong – inside the housing.
Upgrade your motor grader’s drivetrain reliability with the XCMG 800370331 Retaining Ring For Bore 120×4 DIN472.
Engineered for perfect fit, optimum spring force, and long‑term corrosion resistance – choose genuine XCMG for maximum safety and productivity.
Order the 800370331 now and keep your XCMG motor grader operating at peak performance.
