Overview
The ZF 0637.885.626 SCREW-IN SLEEVE is a precision-engineered OEM genuine component designed specifically for the WG 210 Series transmission. This threaded sleeve serves as a critical sealing and alignment interface within the transmission housing assembly, ensuring secure fluid containment and structural integrity under high-torque conditions. Positioned at the junction between the TRANSMISSION HOUSING and the HOUS.FRONT SECT, the screw-in sleeve (SKU 0637.885.626) prevents oil migration and maintains precise axial positioning of internal shafts. Manufactured to ZF’s exacting tolerances, this part is essential for maintaining the WG210’s renowned durability in heavy-duty industrial applications.
Symptoms of Failure
- External oil seepage at the housing joint: A worn or damaged screw-in sleeve often causes transmission fluid to weep from the seam between the HOUSING REAR PART and the main casing, leaving visible drips on the bell housing.
- Intermittent gear engagement hesitation: When the sleeve loses its sealing capacity, hydraulic pressure drops can lead to delayed clutch pack engagement, particularly during cold starts.
- Metallic debris in the oil pan: Fractured sleeve threads shed fine steel particles that accumulate in the filter screen, accelerating wear on the CYLINDRICAL PIN guides.
- Vibration at the transmission mount point: A loosened sleeve allows micro-movement between housing sections, transmitting low-frequency vibration through the chassis during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0637.885.626 |
| OEM Reference | ZF 0637.885.626 |
| Material | Case-hardened alloy steel (16MnCr5) |
| Thread Type | M24 x 1.5 metric fine pitch |
| Overall Length | 42.5 mm |
| Hex Drive Size | SW 19 mm |
| Weight | 0.085 kg |
| Sealing Surface | Nitril rubber O-ring groove (integrated) |
| Torque Specification | 65 Nm ± 5 Nm (dry) |
Compatibility
This screw-in sleeve is primarily validated for the ZF WG 210 Series, but its design also accommodates the WG 180, WG 200, and WG 250 transmission families when used with the corresponding OIL FEED.HOUSG. adapter. It is not compatible with the earlier WG 120 series due to differing thread pitch. Always verify housing bore condition before installation; worn threads may require replacement of the TRANSMISSION HOUSING to ensure proper sealing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101042 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201028 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201013 | HOUSING REAR PART | Rear section for output shaft support |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing sections |
| 0636100801 | CAP SCREW | Fastener for housing flange |
| 4656301148 | FIXING PLATE | Retention plate for sleeve assembly |
| 4657301034 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301035 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | High-tensile bolt for cover plate |
| 4656301048 | OIL FEED.HOUSG. | Oil supply channel housing |
