Overview
The ZF 0631.328.619 SLOTTED PIN is a precision-engineered locating and alignment component specifically designed for the valve body and housing assemblies within ZF WG100, WG130, and WG131 automatic transmissions. This OEM genuine part ensures correct positioning of internal hydraulic circuits, preventing misalignment that can lead to pressure loss or erratic shift behavior. The SKU 0631.328.619 is a critical fastener in the 4143101009: HOUSING and 4143301025: HOUSING assemblies, where it secures the throttle valve and seal carrier in place. Without this slotted pin, the entire spring and fastener sub-system loses its structural integrity, making it a non-negotiable part for any rebuild or repair.
Symptoms of Failure
- Erratic shift timing or delayed engagement: A worn or sheared slotted pin allows the throttle valve to shift out of position, causing inconsistent hydraulic pressure delivery. This is a common long-tail search query for “ZF transmission delayed engagement fix.”
- Internal oil leaks around the valve body: When the pin fails to hold the 0634313603: O-RING in its proper groove, pressurized ATF bypasses the seal, leading to visible drips or puddling under the transmission.
- Hard or no upshift in 3rd gear: Misalignment caused by a damaged pin can block the throttle valve’s travel, resulting in a “stuck in 2nd gear” or “no 3rd gear” condition. This symptom is frequently searched as “WG100 transmission stuck in gear.”
- Metallic rattling from the transmission pan: A broken slotted pin can fall into the sump, creating a loose metallic noise and potentially damaging the 4475280018: SCREW PLUG or other valve body components.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0631.328.619 |
| Material | Case-hardened steel (C10 or equivalent) |
| Overall Length | 28.5 mm |
| Outer Diameter | 8.0 mm |
| Slot Width | 2.0 mm |
| Weight | ~12 grams |
| OEM Reference | ZF 0631.328.619 (Genuine) |
| Surface Finish | Phosphate coated for corrosion resistance |
Compatibility
This slotted pin is engineered for the ZF WG series of powershift transmissions. It is directly compatible with the following models: WG100, WG130, WG131, WG180, and WG200. It is used in both the main valve body and the clutch housing assembly. For complete rebuilds, always pair this pin with a new 0634313591: O-RING and 0636101068: CAP SCREW to ensure a leak-free seal. The pin also interfaces with the 4143221013: THROTTLE VALVE and the 0634304484: O-RING in the pressure regulator circuit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Main transmission housing casting |
| 4143301025 | HOUSING | Valve body housing cover |
| 0634313603 | O-RING | Seals the slotted pin bore |
| 4475280018 | SCREW PLUG | Closes the pin access port |
| 0501342341 | SUPPORT RING | Backup ring for O-ring seal |
| 4143298457 | SEAL KIT | Complete seal overhaul kit |
| 0634313591 | O-RING | Secondary seal for housing |
| 0636101068 | CAP SCREW | Fastener for valve body cover |
| 4143221013 | THROTTLE VALVE | Hydraulic pressure modulator |
| 0634304484 | O-RING | Seal for throttle valve bore |
