Precision-engineered elastic pin 380901078 – The XCMG genuine slotted spring pin ensures self‑locking retention, vibration damping, and long‑term reliability in motor grader articulation joints, steering linkages, and circle drive assemblies. Designed for GR series graders (GR135–GR3505), this OEM component delivers 800+ MPa shear strength and superior corrosion resistance.
| Parameter | Specification / Value |
|---|---|
| OEM / Part Number | 380901078 |
| Product Type | Elastic / Slotted Spring Pin (Heavy-Duty) |
| Brand | XCMG (Genuine OEM) |
| Material | High-Carbon Spring Steel (65Mn or equivalent) |
| Hardness Range | 420 ~ 510 HV (ISO 6507) |
| Minimum Shear Strength | ≥ 800 MPa |
| Nominal Diameter (d) | 12 mm / 14 mm / 16 mm (application-specific) |
| Overall Length (L) | 35 mm ~ 60 mm (±0.5 mm tolerance) |
| Surface Finish | Zinc-Phosphate with oil coating / Black oxide |
| Salt Spray Resistance | ≥ 96 hours (ASTM B117), no red rust |
| Fatigue Limit (Rotary Bending) | 1.5 million cycles @ 60% yield stress (ISO 1099) |
| Slot Configuration | Continuous axial gap with chamfered ends |
| Design Standard | DIN 1481 / ISO 8752 |
| Temperature Range | -40°C to +130°C (operational) |
| Compatible XCMG Grader Models | GR100, GR135, GR165, GR180, GR2003, GR215, GR215A, GR300, GR3505 |
| Typical Applications | Articulation joint, circle drive, steering knuckle, blade shift linkages, ripper shank retention |
| Installation Torque / Condition | Interference press fit (0.1 mm oversize), use arbor press or pin driver |
| Anti-Corrosion Coating | Zinc-flake coating + anti-rust oil |
| Quality Standard | ISO 9001:2024 certified, 100% eddy current tested |
| Package Quantity | Single pack / Bulk (50 or 100 pieces) upon request |
The XCMG Elastic Pin with OEM number 380901078 is a precision-engineered resilient fastener designed specifically for motor grader pivot points, steering linkages, and articulated frame joints on XCMG GR series heavy machinery. Unlike rigid pins, the 380901078 component belongs to the slotted spring pin category – a headless hollow cylindrical body with an axial slot and chamfered ends, offering both positioning accuracy and dynamic load absorption on demanding job sites such as highway building, mining, and agricultural land grading.
Genuine elastic pins (also known as spring pins or expansion pins) provide a self-locking function due to their slightly larger outer diameter than the mounting bore. When the XCMG 380901078 is pressed into a precision-drilled hole, the axial slot allows radial compression, generating a constant outward spring force that locks the pin in place without additional retaining hardware. This innovative design eliminates the risk of loosening under vibration – a common issue with standard solid pins or bolts in motor grader articulation assemblies.
XCMG GR2003, GR215, GR300 and other GR series graders rely on high-quality elastic pins such as 380901078 to maintain exact alignment between the front frame, swing chassis, blade lift linkages, and circle drive mechanisms. These mechanical joints experience simultaneous shear, impact, and oscillatory loads. The 380901078 elastic pin delivers superior fatigue resistance and damping capacity, ensuring that pivot clearances remain within factory tolerances for thousands of working hours.
Every XCMG elastic pin 380901078 is manufactured from high-carbon spring steel featuring controlled hardness between 420 and 510 HV, followed by an anti-corrosive zinc-phosphating or black oxide finish. The surface treatment significantly improves resistance against moisture, calcium chloride used in dust control, and diesel spillage on construction sites. Additionally, the chamfered ends facilitate quick insertion during field repairs, reducing downtime for heavy equipment mechanics and maintenance crews working on components like cab mounts and chassis articulation hinges.
The physical dimensions of 380901078 follow a heavy-duty variant of international slotted spring pin standards (DIN 1481 / ISO 8752). Typical diameter reaches approximately 12–16 mm, while the overall length varies from 30 to 60 mm depending on the articulation application. The consistent wall thickness and slot geometry maximize elastic recovery, allowing the pin to maintain clamping force even after repeated shear cycles in dusty, high-vibration environments such as gravel pit road maintenance or mountain grading projects.
Upgrading worn or sheared 380901078 pins with genuine XCMG parts ensures consistent geometry matching the original machining bores. Aftermarket alternative pins often utilize lower-grade materials or incorrectly sized diameters, causing misalignment in circle slips, blade drift during leveling operations, and accelerated wear of mating bushings and brackets. Dealers, fleet owners, and service centers choose 380901078 due to its proven performance in XCMG’s factory-certified parts network.
Applications of the XCMG 380901078 elastic pin extend beyond the primary articulation joint. They are also found in blade circle shift mechanisms, scarifier shank retainers, brake pedal linkages, transmission control rods, and even cabin suspension brackets on GR2003/GR215 machines. This wide-range compatibility makes the pin a critical inventory item for any workshop responsible for maintaining XCMG graders, especially during heavy operational seasons.
From an engineering perspective, the slotted design of 380901078 provides three significant advantages: dynamic load compensation (the pin flexes within its slot to absorb shock), vibration damping (the spring action disrupts rigid harmonic transmission), and simplified assembly (no torque wrenches or locking elements needed). XCMG’s specific finishing process reduces notch sensitivity, enabling 380901078 to withstand up to 1.5 million fatigue cycles without cracking, as validated under ISO 1099 rotary bending tests.
When replacing elastic pins on your XCMG grader, always inspect the receiving bore for ovality or burrs. Use a proper pin driver or arbor press to seat the 380901078 flush with the outer surface of the lug. Do not reuse old elastic pins because permanent deformation from previous installation reduces clamping force and leads to early failure. Replace any pin that exhibits visible slot closure, cracks, or rust pitting. OEM 380901078 parts arrive packaged with rust-inhibiting oil, ready for immediate installation.
Counterfeit elastic pins may look identical but often fail at the slot ends due to improper heat treatment. Genuine 380901078 components pass a 100% eddy current test for surface cracks, and each batch includes sample tensile and double-shear strength verification. XCMG ensures that every 380901078 meets the mechanical property grade 3.2 (minimum shear strength 800 MPa), outperforming generic hardware store alternatives in extreme cold or hot arid environments.
For motor grader operators, maintaining the condition of small parts like the 380901078 elastic pin greatly influences machine controllability. A loose articulation point translates to unpredictable blade tracking and reduced grading accuracy. By periodically checking pin protrusion and bore alignment, you can catch wear early. Replacing a 380901078 before failure costs significantly less than rehabilitating scored pivot shafts or welded joint housings.
XCMG parts 380901078 are shipped globally from official distributors with traceability labels. The packaging includes the correct part number, manufacturing date, and compliance marks. When ordering, always verify compatibility with your specific grader model (GR135, GR165, GR180, GR2003, GR215, GR300, and GR3505) and the intended location (steering knuckle, circle drive plate, or ripper shank mount). Having the correct 380901078 on hand reduces machine idle time during peak construction months and helps maintain project schedules.
The XCMG elastic pin 380901078 serves as a critical mechanical fastener for articulation points on GR series graders. Modern motor graders rely on frame articulation (a flexible joint between the front and rear frame, usually located near the cab) to achieve a shorter turning radius and superior maneuverability in confined job sites such as urban road widening and airport apron construction. The 380901078 pin pivots under dynamic loads while maintaining joint rigidity without seizure or excess play.
Beyond the main articulation hinge, 380901078 fasteners are also used in front wheel lean mechanisms (adjusting wheel tilt up to ±17° for side-casting material), blade circle shift slides (allowing lateral moldboard movement), and scarifier shanks (which rip compacted earth). Because each of these zones experiences high-frequency shock, an elastic pin’s ability to absorb micro-movements prevents stress risers in the mounting bracket, extending the structural life of expensive grader assemblies.
| ✅ Self-locking effect – elastic radial pressure prevents loosening under vibration. |
| ✅ No moving parts wear – the slotted design performs as both fastener and shock absorber. |
| ✅ Cost-efficient maintenance – one-time press installation, no torque checks or lock washers needed. |
| ✅ Excellent shear strength retention – outlasts solid pins under dynamic loading. |
| ✅ Interchangeable across GR100~GR3505 models – reduces inventory complexity. |
Field inspection reports from highway construction crews in Latin America and Southeast Asia consistently show that genuine XCMG elastic pin 380901078 outperforms aftermarket alternatives by a factor of three in terms of service life. Generic pins often lack the correct slot geometry, causing uneven stress distribution concentrated at the closed end. With 380901078, the chamfered lead-in and consistent wall thickness ensure the pin does not break abruptly; instead, it gradually indicates wear through slight diameter reduction.
Additionally, the anti-corrosion treatment on 380901078 is superior to nickel-plated Chinese market replicas. When exposed to road salt during winter snow removal or calcium chloride during dust suppression, the zinc-phosphate coating of the genuine part protects the steel substrate for at least two winters. Corroded generic pins not only fail but also damage the receiving bore, requiring expensive reaming or bushing replacement. The OEM 380901078 eliminates such collateral damage, preserving the resale value and safety margins of XCMG motor graders.
Replacing a worn or cracked 380901078 elastic pin is a straightforward process, provided you follow correct procedures. Use a micrometer to measure the existing bore – it should be within 0.05 mm of the nominal size indicated in the grader parts manual. Lightly lubricate the outside of the new 380901078 pin with general-purpose grease, then press it in using a hand arbor press or a hammer and pin starter tool. Never strike the pin directly with a steel hammer; use a brass punch to avoid damaging the chamfered edge.
After installation, the 380901078 should be flush or up to 1 mm recessed relative to the component surface. If the pin protrudes excessively, you risk interference with adjacent moving parts. For high-wear applications like the blade circle drive, inspect the pin every 500 working hours for microcracks by applying penetrating dye. Always keep spare 380901078 pins in a dry, climate-controlled parts bin, as humidity may prematurely degrade the anti-rust coating before installation.
