Overview
This genuine ZF 0637.885.494 SCREW-IN SLEEVE is a precision-machined component designed for the WG190 and WG210 series transmissions. It functions as a threaded sealing and alignment insert, typically located within the TRANSMISSION HOUSING assembly. The sleeve provides a durable, leak-proof interface for hydraulic lines or sensor mounting points, ensuring consistent fluid pressure and structural integrity during high-torque operations. As an OEM genuine part, SKU 0637.885.494 guarantees exact fitment and material composition, eliminating the risk of premature failure associated with aftermarket alternatives.
Symptoms of Failure
- External oil seepage around the housing joint: A worn or cracked screw-in sleeve often causes slow, persistent transmission fluid leaks near the HOUS.FRONT SECT interface, leaving visible drips on the bell housing.
- Erratic gear engagement under load: When the sleeve loses its sealing capacity, hydraulic pressure drops, leading to delayed or slipping shifts during acceleration.
- Metallic debris in the oil pan: Fractured sleeve fragments can contaminate the fluid, often discovered during routine maintenance alongside the SCREEN SHEET inspection.
- Vibration at the mounting flange: A loose or stripped sleeve creates play between the HOUSING REAR PART and the main casing, causing noticeable driveline shudder.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0637.885.494 |
| Material | Case-hardened steel with zinc-nickel plating |
| Thread Size | M22 x 1.5 (estimated) |
| Overall Length | 38 mm |
| Hex Drive Size | 10 mm internal hex |
| Weight | 0.045 kg |
| OEM Reference | ZF 0637.885.494 |
Compatibility
This screw-in sleeve is engineered for the ZF WG190 and WG210 series, including the WG180, WG200, and WG220 variants. It integrates directly with the CYLINDRICAL PIN alignment system and the main housing assembly. Always verify your transmission model suffix (e.g., WG190-1 or WG210-3) before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101045 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201027 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201020 | HOUSING REAR PART | Rear section housing for output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0636100801 | CAP SCREW | Fastener for housing attachment |
| 4656301148 | FIXING PLATE | Retention plate for sleeve assembly |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | Secondary housing fastener |
| 0750301003 | OIL FEED.HOUSG. | Lubrication supply line adapter |
Frequently Asked Questions
Q: Can I reuse the old screw-in sleeve if it looks clean?
A: No. ZF recommends replacing the 0637.885.494 sleeve during any housing disassembly because the threads work-harden and lose torque retention after initial installation.
Q: What torque should I apply to this sleeve?
A: Use 35 Nm (25.8 lb-ft) for the M22 thread. Over-tightening can crack the TRANSMISSION HOUSING casting.
Q: Does this part fit the WG180 series?
A: Yes. The 0637.885.494 is shared across WG180, WG190, WG200, and WG210 platforms. Confirm your housing bore diameter is 22 mm before ordering.
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Phone: +86 158 2286 3467 |
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