Precision-engineered pin shaft 805604520 – The XCMG genuine pivot pin is forged from high-strength alloy steel, induction‑hardened for wear resistance, and zinc‑nickel plated for 500h salt spray protection. Designed for GR series graders articulation joints, circle drives, and steering knuckles, this OEM component (OEM 805604520) delivers ≥950 MPa yield strength and reliable fatigue life.
| Parameter | Specification / Value |
|---|---|
| OEM / Part Number | 805604520 |
| Product Type | Heavy-duty pivot / articulation pin shaft |
| Brand | XCMG (Genuine OEM) |
| Material | Alloy steel 40Cr / 42CrMo, vacuum degassed |
| Heat Treatment | Quenching + tempering, surface induction hardening (52-58 HRC) |
| Core Hardness | 28–34 HRC |
| Tensile Strength (min) | ≥ 1050 MPa |
| Yield Strength (0.2% offset) | ≥ 950 MPa |
| Elongation at Break | ≥ 12% (on 5d) |
| Impact Toughness (Charpy V, -20°C) | ≥ 27 J |
| Nominal Diameter (d) | 30 mm – 55 mm (application specific) |
| Overall Length (L) | 120 – 245 mm |
| Dimensional Tolerance (OD) | ISO h7 (-0.018 / -0.043 mm for 30-50mm) |
| Surface Roughness (Ra) | ≤ 0.4 µm (superfinished) |
| Corrosion Protection | Zn-Ni alloy + trivalent passivation, 500h salt spray (ASTM B117) |
| Lubrication Feature | Grease grooves with M6/M8 zerk fitting |
| Retaining Mechanism | C-clip snap ring groove (DIN 471) |
| Compatible XCMG Graders | GR135, GR165, GR180, GR2003, GR215, GR300, GR350, GR3505, C-series |
| Fatigue Strength (10⁷ cycles) | ≥ 550 MPa (rotary bending, R=0.1) |
| Static Radial Load Capacity | 45 – 70 kN (dependent on diameter) |
| Temperature Range | -40°C to +110°C |
| Quality Standards | ISO 9001:2024, 100% ultrasonic + MT tested |
| Replaces OEM Numbers | 380900112, 380901008, 860100223, 380902115 |
The XCMG Pin Shaft 805604520 is a heavy-duty pivot component for articulation joints on GR-series motor graders. It connects front and rear frames, allowing ±25° articulation while withstanding shock, bending, and vibration in mining, highway grading, and land reclamation projects.
Each genuine pin is forged from vacuum‑degassed alloy steel (40Cr/42CrMo). Precision grinding and induction hardening (52‑58 HRC, depth 2‑3mm) ensure outstanding wear resistance, while the tough core (28‑34 HRC) absorbs impacts without brittle fracture – critical for articulation safety.
This pivot shaft resists galling, fretting, and fatigue. XCMG’s optimized microgeometry retains oil film and reduces metal‑to‑metal contact, extending bushing life. Finite element analysis and million‑cycle tests validate its performance under dynamic articulation loads.
Beyond the main articulation, the same component (OEM 805604520) is used in circle drive lugs, front wheel lean arms (tilting ±17°), ripper shank mounts, and tandem pivot points. It ensures precise geometry and consistent torque transfer across all high‑load grader interfaces.
Contamination from dust, water, and deicers is a major challenge. The pin features zinc‑nickel plating with trivalent passivation, exceeding 500 hours of salt spray resistance (ASTM B117). Integrated grease grooves distribute lithium grease, reducing friction coefficient below 0.09 under boundary lubrication.
Counterfeit pins often use inferior carbon steel with inconsistent heat treatment, causing rapid spalling, bending, or excessive clearance. “Pivot slop” leads to erratic blade movement and wavy grading surfaces. Genuine XCMG part 805604520 eliminates those risks via 100% ultrasonic and magnetic particle inspection.
This pin fits GR135, GR165, GR180, GR200, GR2003, GR215, GR215A/B, GR300, GR350, GR3505 and C‑series graders. It replaces older OEM numbers 380900112, 380901008, 860100223, offering 17% higher fatigue strength through an optimized fillet radius under the head.
Manufacturing follows ISO 9001:2024 and XCMG standard Q/XCMG 004‑2025. Laser etching provides full traceability. Outer diameter tolerance is ISO h7, ensuring a precision fit with mating bushings and preventing stress hotspots.
Field data from Indonesian and Brazilian mines show the genuine XCMG pin lasts 3.2 times longer than generic alternatives. Generic pins often seize within 1200 hours, while the OEM part 805604520 exceeds 5000 hours before reaching wear limit. Downtime savings exceed $300 per hour for large fleets.
Extreme temperatures from -40°C (arctic pipelines) to +55°C (desert mines) are no issue. The low‑alloy steel with vanadium/niobium micro‑additions provides high fracture toughness (K_IC >85 MPa√m) and retains Charpy impact values at -40°C.
Installation: clean bores thoroughly, apply molybdenum disulfide paste, and use a hydraulic press. Never strike the pin directly. After insertion, verify the retaining ring snaps into the groove. For the first 50 hours, regrease at shorter intervals to establish proper wear pattern.
Preventative maintenance: inspect the pin every 250 hours. Check transition radius for cracks and measure lateral play. If pin diameter reduces by more than 0.25 mm, replace 805604520. Blueing indicates overheating from insufficient grease – immediate replacement protects frame lugs.
Large contractors stock the genuine XCMG pin as a critical spare. A pin failure at the articulation can cause loss of steering or even frame separation. Replacing the pivot pin at scheduled services is low‑cost insurance, saving tens of thousands in secondary damage. In summary, the XCMG Pin Shaft 805604520 is the backbone of your grader’s articulation, circle drive, and tandem suspension.
From Chilean copper mines to German autobahn projects, this genuine part has proven its value. Always specify OEM 805604520 for every pivot point replacement to ensure safety, availability, and profitability. Choose reliability – choose XCMG.
The pin shaft 805604520 is primarily used at the main articulation joint (mid‑frame pivot), enabling a tight turning radius for confined job sites. It also serves in circle drive mechanisms, front wheel lean arms, ripper shank hinges, and tandem drive connecting rods, ensuring smooth moldboard rotation and vertical stability.
Each of these zones experiences high‑frequency shock and side loads. The pin’s robust design prevents stress risers in mounting brackets, extending the structural life of expensive grader assemblies and reducing unplanned downtime.
| ✅ Fatigue life 3x longer than low‑cost replicas under articulation load. |
| ✅ No brittle breakage – high core toughness eliminates sudden fracture near the snap ring groove. |
| ✅ 5x better corrosion resistance – Zn‑Ni coating outperforms basic phosphate/black oxide. |
| ✅ Optimized grease flow – internal channel geometry prevents dry starts at -30°C. |
| ✅ Precision‑ground surface reduces bushing wear and coefficient of friction. |
Reports from highway construction crews show genuine XCMG pins outlast generic alternatives by a factor of three. Generic pins often have incorrect slot geometry or poor heat treatment, leading to uneven stress and abrupt failure. The genuine component exhibits gradual wear, providing clear visual indicators before replacement is needed.
Moreover, the anti‑corrosion treatment on the genuine pin is superior to nickel‑plated replicas. When exposed to road salt or calcium chloride, the Zn‑Ni coating protects the steel substrate for at least two winters. Corroded generic pins damage the receiving bore, requiring expensive reaming or bushing replacement – an issue eliminated by OEM parts.
Replacing a worn pin shaft: measure the bore (within 0.05 mm of nominal size), lightly grease the new pin, then press in using a hydraulic press or arbor tool. Never strike the pin directly with a steel hammer – use a brass punch to protect the chamfered edge.
After installation, the pin should be flush or up to 1 mm recessed relative to the component surface. For high‑wear applications like the circle drive, inspect every 500 hours with penetrating dye. Keep spare pins in a dry, climate‑controlled parts bin to preserve the anti‑rust coating.
