Overview
The ZF 0636.115.287 CAP SCREW is a critical fastening component engineered specifically for the WG191 and WG211 transmission series. This OEM genuine part secures the valve body and hydraulic control assemblies within the transmission housing, ensuring precise clamping force to maintain internal fluid pressure integrity. The SKU 0636.115.287 is designed to withstand high torque loads and thermal cycling common in heavy-duty industrial applications. When installed correctly, this cap screw prevents fluid migration between galleries and maintains the structural alignment of adjacent components such as the 4657120005: PRESSURE REGULATOR and the 0501211384: VALVE.
Symptoms of Failure
- Transmission fluid seepage around the valve body: A worn or stripped cap screw loses its sealing force, allowing ATF to weep past the mating surfaces, often visible as drips on the transmission pan.
- Erratic shift timing or harsh engagement: When the cap screw loosens, the 4656306145: PISTON and valve train can shift out of alignment, causing delayed or abrupt gear changes.
- Audible rattling or vibration from the transmission housing: A loose cap screw permits micro-movement of internal components, generating a metallic chatter that intensifies under load.
- Intermittent loss of hydraulic pressure: Failure to maintain proper clamp load can cause the 0630532183: INDENTED RING to shift, leading to pressure drops during gear shifts.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 0636.115.287 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 35 mm (estimated) |
| Head Type | Hex socket (Allen), 8 mm drive |
| Material | High-tensile alloy steel, zinc-plated |
| Weight | Approx. 28 grams |
| OEM Reference | ZF 0636.115.287 |
| Torque Specification | 25 N·m (estimated) |
Compatibility
This cap screw is designed for the ZF WG191 and WG211 series transmissions. Based on its thread pattern and application, it is also compatible with the WG180, WG200, and select WG250 variants that share the same valve body architecture. The 0636.115.287 is frequently replaced alongside the 0732042767: COMPRESSION SPRING and the 0631612064: SET SCREW during valve body overhauls. Always verify thread pitch against your transmission’s housing bore before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | PRESSURE REGULATOR | Controls main line pressure to clutch packs |
| 0501211384 | VALVE | Directs hydraulic flow for shift timing |
| 0630532183 | INDENTED RING | Provides sealing land for piston assembly |
| 4656306145 | PISTON | Applies force to clutch friction discs |
| 0732042767 | COMPRESSION SPRING | Returns valve spools to neutral position |
| 0631612064 | SET SCREW | Locks adjustment sleeves in valve body |
| 0631610026 | SET SCREW | Secures shift detent springs |
| 4657101049 | TRANSMISSION HOUSING | Main structural case for gear train |
| 4657301130 | HOUS.FRONT SECT | Front section of split housing |
| 4657301131 | HOUSING REAR PART | Rear section of split housing |
Frequently Asked Questions
Q: Can I reuse the 0636.115.287 cap screw after removal?
A: ZF recommends replacing this cap screw with a new OEM part whenever the valve body is disassembled. The thread-locking coating degrades after initial torque, and reuse can lead to loosening under vibration.
Q: What torque should I apply to this cap screw?
A: The estimated torque specification is 25 N·m for a dry installation. Always consult your ZF service manual for the exact value, as variations exist between WG191 and WG211 series.
Q: Does this cap screw fit the WG180 transmission?
A: Yes, the 0636.115.287 is compatible with WG180, WG200, WG191, and WG211 series transmissions that use M10 x 1.5 threaded bores in the valve body area. Verify your housing part number against the 4657101049: TRANSMISSION HOUSING to confirm fitment.
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