Overview
The ZF 4472.374.113 轴承销 (bearing pin) is a critical load-bearing component engineered for the planetary gear sets within heavy-duty ZF transmissions. This OEM genuine part, identified by SKU 4472.374.113, serves as the central pivot point for needle bearings and planetary gears, ensuring precise alignment and rotational stability under extreme torque loads. Located within the transmission’s sun gear or planetary carrier assembly, this pin absorbs radial forces and facilitates smooth power distribution across the gear train. Without a properly functioning bearing pin, gear mesh accuracy degrades, leading to accelerated wear on adjacent components. As a factory-spec replacement, the 4472.374.113 guarantees original dimensional tolerances and metallurgical integrity for demanding construction machinery applications.
Symptoms of Failure
When the ZF 4472.374.113 bearing pin wears beyond service limits, operators will notice distinct operational anomalies. Below are four specific failure indicators that signal replacement is necessary:
- Intermittent gear slipping under load: A worn pin allows excessive radial play, causing planetary gears to momentarily lose engagement during heavy excavation or grading operations.
- Metallic grinding noise from transmission housing: As the bearing surface deteriorates, hardened steel-on-steel contact produces a distinct high-pitched whine or grinding sound, particularly during gear shifts.
- Contaminated transmission oil with ferrous debris: Flaking or spalling of the pin’s case-hardened surface introduces metallic particles into the hydraulic circuit, visible during oil sampling or filter inspection.
- Progressive oil seepage at planetary carrier seals: Excessive pin vibration distorts adjacent seal surfaces, leading to gradual fluid loss around the transmission output flange.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4472.374.113 |
| Overall Length | 68.5 mm |
| Outer Diameter | 22.0 mm |
| Inner Bore Diameter | 10.0 mm |
| Material | Case-hardened alloy steel (16MnCr5 equivalent) |
| Surface Hardness | 58–62 HRC |
| Weight | 0.14 kg |
| OEM Reference | ZF 4472.374.113 |
Compatibility
This bearing pin is specifically designed for ZF’s WG-series and ERGOPOWER transmissions commonly installed in wheel loaders, excavators, and telehandlers. Based on its structural dimensions and load rating, the 4472.374.113 is compatible with the following ZF transmission models:
- ZF WG180 (6-speed powershift, used in 10–14 ton loaders)
- ZF WG200 (6-speed, 14–18 ton applications)
- ZF ERGOPOWER 4WG-200 (with integrated torque converter)
- ZF 4WG-310 (heavy-duty mining and quarry variants)
For precise fitment verification, always cross-reference your transmission’s serial number with the OEM parts catalog. This pin is not interchangeable with aftermarket generic pins due to its specific chamfer geometry and press-fit tolerance.
