Overview
The ZF 0636.015.034 HEXAGON SCREW is a critical OEM genuine fastener engineered specifically for the WG 65 and WG 180 series transmissions. This precision-machined bolt secures the TRANSMISSION HOUSING assembly, ensuring proper clamping force and alignment of internal gear sets. As a direct replacement for part number 0636.015.034, this hexagon screw maintains the exact tensile strength and thread specifications required by ZF drivetrain systems. Without this component, the structural integrity of the transmission casing is compromised, leading to misalignment of rotating elements.
Symptoms of Failure
- Transmission oil seepage around housing bolts – When the 0636.015.034 hexagon screw loses torque retention, pressurized ATF fluid escapes through the housing mating surfaces, leaving visible wet spots on the bell housing.
- Abnormal gear engagement noise – A loose or fatigued hexagon screw allows the transmission housing to flex under load, producing a distinct metallic clatter during gear shifts, especially in WG65 models.
- Vibration during highway cruising – Worn fasteners cause micro-movement between the housing and valve body, transmitting harmonic vibrations through the chassis at speeds above 50 mph.
- Intermittent hydraulic pressure loss – A compromised seal at the screw interface leads to pressure drops in the clutch circuits, resulting in delayed or harsh shifting patterns.
Technical Specifications
| Parameter | Value |
|---|---|
| ZF Part Number (SKU) | 0636.015.034 |
| Thread Size | M10 x 1.5 |
| Overall Length | 35 mm |
| Head Type | Hexagon (17 mm socket) |
| Material Grade | Steel 10.9 (high-tensile) |
| Surface Treatment | Zinc-plated, yellow passivated |
| Weight | 0.042 kg |
| OEM Reference | ZF 0636.015.034 |
| Torque Specification | 45 Nm + 90° angle |
Compatibility
This hexagon screw is factory-specified for the ZF WG 65 series and WG 180 series transmissions. It is also compatible with select WG200 variants that share the same housing bolt pattern. The 0636.015.034 fastener is used in conjunction with the HEXAGON SCREW (0636011038) for the upper housing section and the HEXAGON SCREW (0636011118) for the oil pan attachment. For the main bearing cap retention, the HEXAGON SCREW (0636016015) is used alongside this part. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101065 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 0636011038 | HEXAGON SCREW | Upper housing retention fastener |
| 0636011118 | HEXAGON SCREW | Oil pan attachment bolt |
| 0636016015 | HEXAGON SCREW | Main bearing cap fastener |
| 0631306085 | CYLINDRICAL PIN | Housing alignment dowel |
| 0634313118 | O-RING | Hydraulic circuit seal |
| 0636304019 | SCREW PLUG | Oil drain port closure |
| 0634801152 | SEALING RING | Copper crush washer for plugs |
| 0732611049 | FILTER INSERT | Internal oil filtration element |
| 0634303718 | O-RING | Filter housing gasket |
