Overview
The ZF 0636.101.073 CAP SCREW is a critical fastening component engineered for the WG171, WG191, and WG211 transmission series. This OEM genuine part secures the 4108101108: HOUSING assembly, ensuring proper clamping force and alignment within the gearbox. Without this cap screw, internal components like the 4108301436: INPUT SHAFT cannot maintain positional stability under heavy torque loads. The SKU 0636.101.073 is precision-machined to ZF’s exacting tolerances, making it indispensable for preventing axial play and maintaining oil seal integrity.
Symptoms of Failure
- Transmission oil seepage around the housing joint: A loose or stripped cap screw allows the 4108306172: GASKET to shift, creating a path for fluid escape. This is often noticed as wet spots on the bell housing.
- Audible clicking or knocking during gear engagement: When the cap screw fails, the housing can micro-move, causing the input shaft to misalign with the 0735330931: BALL BEARING.
- Vibration at highway speeds: A compromised cap screw reduces structural rigidity, leading to harmonic vibrations that accelerate wear on the 0730365280: TYPE PLATE and adjacent seals.
- Intermittent gear slippage under load: Loss of clamping force allows the housing to separate slightly, reducing pressure on clutch packs.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0636.101.073 |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 35 mm (estimated) |
| Head Type | Hex Socket Cap |
| Material | Alloy Steel, 10.9 Grade |
| Surface Finish | Zinc-Plated (Corrosion Resistant) |
| Weight | ~0.04 kg |
| OEM Reference | ZF 0636.101.073 |
| Torque Spec | 45 Nm (dry, estimated) |
Compatibility
This cap screw is directly compatible with the ZF WG171, WG191, and WG211 series transmissions. It also fits the WG180 and WG200 variants where the housing bolt pattern matches. Always verify thread pitch against your existing 0630532160: RETAINING RING and 0630531130: RETAINING RING assemblies. For sealing applications, pair with the 0634801057: SEALING RING to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101108 | HOUSING | Encloses gear train and supports shafts |
| 4108306172 | GASKET | Seals housing joint to prevent oil leaks |
| 0730365280 | TYPE PLATE | Identifies transmission model and specs |
| 4108301436 | INPUT SHAFT | Transfers engine torque into gearbox |
| 0735330931 | BALL BEARING | Supports rotating shaft with low friction |
| 0630532160 | RETAINING RING | Secures bearing axial position |
| 0630531130 | RETAINING RING | Locks shaft in housing bore |
| 0636302014 | SCREW PLUG | Closes oil passages during service |
| 0634801057 | SEALING RING | Prevents fluid escape at threaded joints |
| 4475280018 | SCREW PLUG | Seals inspection or drain ports |
Frequently Asked Questions
Q: Can I reuse the 0636.101.073 cap screw after removal?
A: ZF recommends replacing this cap screw with a new OEM unit whenever the housing is disassembled. The threads can stretch under torque, compromising clamping force and risking oil leaks around the 4108306172: GASKET.
Q: What torque should I apply to this cap screw?
A: For the WG171/WG191/WG211 series, tighten to 45 Nm (dry) in a cross-sequence pattern. Always consult your service manual, especially if using a 0634801057: SEALING RING under the head.
Q: Will this part work with the WG180 transmission?
A: Yes, the 0636.101.073 cap screw is compatible with WG180 and WG200 models that share the same housing bolt pattern. Verify by checking the 0730365280: TYPE PLATE for your specific variant.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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