Overview
The ZF 0501.317.490 COTTER PIN is a critical locking fastener engineered specifically for the planetary gear assemblies and differential carrier systems within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part secures rotating components against axial displacement, preventing unintended disengagement of shafts and gears under high-torque conditions. The SKU 0501.317.490 is installed at the interface between the differential housing and the axle shaft, where it locks the retaining nut or bolt in place. When paired with a DIFFERENTIAL HOUSING, this cotter pin ensures that the entire differential assembly remains torsionally stable during heavy load cycles.
Symptoms of Failure
- Transmission gear slippage under load: A worn or sheared cotter pin allows the differential shaft to drift axially, causing intermittent gear disengagement and a sudden loss of drive torque.
- Metallic rattling from the differential area: When the pin fatigues, loose components inside the DIFFERENTIAL create a distinct clicking or rattling noise during acceleration or deceleration.
- Oil seepage around the axle flange: A failed cotter pin permits slight movement of the retaining nut, breaking the seal between the differential housing and axle, leading to gradual transmission fluid leaks.
- Abnormal vibration at highway speeds: Loss of pin integrity allows the TAPER ROLLER BEARING preload to change, generating low-frequency vibration that worsens with speed.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0501.317.490 |
| Material | Carbon steel, zinc-plated (DIN 94 standard) |
| Pin Diameter | 5.0 mm (0.197 in) |
| Pin Length | 40.0 mm (1.575 in) |
| Head Style | Split cotter (two-leg design) |
| Weight | 0.008 kg (0.018 lbs) |
| OEM Reference | ZF 0501.317.490 |
| Application Torque Range | 80–120 N·m (retaining nut) |
Compatibility
This genuine ZF cotter pin is validated for use in the following transmission models: WG100, WG130, WG131, WG180, and WG200 series. It is also compatible with select off-highway ZF drivelines that share the same differential carrier architecture. For complete assembly integrity, always replace this pin when servicing the DIFFERENTIAL or any adjacent axle components.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads on differential |
| 2093209023 | DIFFERENTIAL | Alternative differential assembly for WG series |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses and supports differential gears |
| 0631329088 | SPRING PIN | Secures shift forks and linkage pins |
| 5838300811 | THRUST WASHER | Controls axial clearance in differential |
| 5838300721 | AXLE BEVEL GEAR | Transfers power from differential to axle |
| 5838300633 | AXLE | Transmits rotational force to wheels |
| 5838300753 | THRUST WASHER | Reduces friction between rotating gears |
| 5838300818 | THRUST WASHER | Additional axial load distribution |
Frequently Asked Questions
Q: Can I reuse the ZF 0501.317.490 cotter pin after removal?
A: No. Cotter pins are single-use fasteners. The split legs deform during installation and lose clamping force if reused, risking component loosening inside the differential.
Q: How do I know if the cotter pin has failed without disassembly?
A: Listen for a rhythmic clicking from the differential area during low-speed turns, or check for fresh oil residue around the axle flange bolt. Both indicate pin fatigue.
Q: Is this pin compatible with aftermarket differential housings?
A: The 0501.317.490 is dimensionally identical to DIN 94 standards, but we recommend using it only with OEM ZF housings to ensure correct hole alignment and shear strength.
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