Overview
This OEM genuine ZF 0636.102.872 CAP SCREW is a critical fastening component designed for the WG100, WG130, and WG131 transmission series. It secures the 4108101175: HOUSING assembly, ensuring that internal pressure seals remain intact under high-torque conditions. The SKU 0636.102.872 is precision-machined to ZF’s exacting tolerances, preventing fastener fatigue that can lead to fluid migration between chambers. This cap screw is installed directly into the transmission’s outer casing, where it anchors the valve body and clutch pack retainers. Without this specific fastener, the structural integrity of the gear train is compromised, making it a non-negotiable part for any rebuild or overhaul.
Symptoms of Failure
- Transmission fluid seepage at the housing joint: A worn or stretched 0636.102.872 cap screw allows the housing to separate microscopically, causing oil to weep from the mating surface. This is often misdiagnosed as a gasket failure.
- Intermittent gear slippage under load: When this fastener loses clamping force, the valve body shifts slightly, altering hydraulic pressure to the clutches. You may notice hesitation during upshifts in the WG100 series.
- Unusual metallic rattling from the bell housing: A loose cap screw vibrates against the 0636302015: SCREW PLUG and surrounding components, creating a distinct rattle at idle that disappears under throttle.
- Hard shifting or delayed engagement: As the screw backs out, it alters the alignment of the shift rail, leading to harsh engagement between gears. This symptom is particularly common in WG131 units operating in heavy-duty cycles.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.102.872 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 35 mm |
| Head Type | Hex Socket (Allen) |
| Material | Alloy Steel, Zinc-Plated |
| Weight | 0.04 kg (0.09 lbs) |
| OEM Reference | ZF 0636.102.872 |
| Grade | 10.9 (high tensile) |
Compatibility
This cap screw is factory-specified for ZF WG100, WG130, and WG131 transmissions. It is also used in select WG180 and WG200 variants where the housing bolt pattern matches the M10 thread pitch. Always verify the thread depth against your specific 0501325471: SEALING RING and 0730365280: TYPE PLATE configuration before installation. The 0636.102.872 is not backward-compatible with older ZF 4HP series units due to different thread standards.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101175 | HOUSING | Main structural casing for gear train |
| 0636302015 | SCREW PLUG | Seals oil passages in the valve body |
| 0501325471 | SEALING RING | Prevents fluid bypass at joint interfaces |
| 0730365280 | TYPE PLATE | Identification tag for transmission model |
| 4108301437 | INPUT SHAFT | Transfers engine torque to planetary gears |
| 0735330931 | BALL BEARING | Supports rotating shaft loads |
| 0630532160 | RETAINING RING | Axial lock for bearing assemblies |
| 0630531130 | RETAINING RING | Secures clutch pack snap rings |
| 4475280018 | SCREW PLUG | Drain or fill port closure |
| 0634304358 | O-RING | Static seal for hydraulic circuits |
Frequently Asked Questions
Q: Can I reuse the 0636.102.872 cap screw after removing it during a rebuild?
A: ZF engineering recommends replacing this cap screw with a new OEM unit every time it is removed. The zinc coating and thread lock degrade after initial torque application, and reusing it risks insufficient clamping force on the housing.
Q: Does this cap screw require thread sealant?
A: No. The 0636.102.872 is a dry fastener designed for direct installation into the housing. Applying sealant can alter the torque-to-yield characteristics and cause over-tightening. Always use a calibrated torque wrench set to 45 Nm.
Q: Will this part fit a ZF WG180 transmission?
A: It is compatible with WG180 units that share the same housing bolt pattern as the WG131. Check your transmission’s type plate (part 0730365280) to confirm the thread specification before ordering.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
