Overview
The ZF 0637.852.002 SCREW NECK is a precision-engineered fastener designed to secure critical housing assemblies within ZF WG-series transmissions. This OEM genuine part, identified by SKU 0637.852.002, functions as a threaded locating pin that aligns and clamps the differential housing to the main transmission casing. It is commonly found in the rear axle section, where it withstands high torsional loads and vibration. When installed correctly, this screw neck ensures that adjacent components such as the 2093109002 DIFFERENTIAL remain securely positioned during operation.
Symptoms of Failure
When the ZF 0637.852.002 screw neck fatigues or strips, operators may notice specific performance issues. Look for these warning signs:
- Oil seepage around the housing joint – A loose or damaged screw neck can break the seal between the differential housing and the transmission case, leading to gradual fluid loss.
- Abnormal gear whine or clunking – Insufficient clamping force allows the 2093209095 DIFFERENTIAL to shift slightly under load, producing audible noise during acceleration or deceleration.
- Vibration in the driveline – A worn screw neck fails to maintain proper preload on the 0750117075 TAPER ROLLER BEARING, causing axial play that transmits vibration through the chassis.
- Difficulty engaging gears – Misalignment from a compromised fastener can affect the 2093309071 DIFF.HOUSING position, leading to rough shifting or gear clash.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 0637.852.002 |
| Thread Size | M16 x 1.5 |
| Overall Length | 42 mm |
| Head Diameter | 24 mm |
| Material | Case-hardened alloy steel (DIN 17210) |
| Surface Finish | Zinc-plated, yellow passivated |
| Weight | 0.065 kg |
| OEM Reference | ZF 0637.852.002 |
Compatibility
This screw neck is engineered for ZF WG100, WG130, and WG131 series transmissions. It also fits select WG180 and WG200 models that share the same differential housing bolt pattern. Always verify the thread pitch and length against your existing fastener before installation. The part is frequently replaced alongside the 2093109002 DIFFERENTIAL during major overhauls.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109002 | DIFFERENTIAL | Distributes torque to the axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential side gears under radial load |
| 2093209095 | DIFFERENTIAL | Secondary differential unit for multi-axle drives |
| 2093309071 | DIFF.HOUSING | Encloses the differential gear set |
| 0631100223 | SPRING PIN | Secures shift fork or detent mechanism |
| 0730300820 | THRUST WASHER | Reduces axial friction in the differential |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to the wheel axle |
| 2097309085 | DIFFERENTIAL AXLE | Carries the differential side gears |
| 5838300811 | THRUST WASHER | Prevents gear-to-housing contact |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Drives the axle bevel gear |
Frequently Asked Questions
Q: Can I reuse the 0637.852.002 screw neck after disassembly?
A: ZF recommends replacing this fastener with a new OEM part whenever the differential housing is removed. The screw neck is a torque-to-yield component that loses clamping force after initial installation.
Q: What torque specification should I use for this screw neck?
A: For WG100/WG130/WG131 transmissions, tighten the 0637.852.002 to 85 N·m (63 ft-lb) plus 90 degrees of rotation. Always consult your service manual for exact values.
Q: Does this part fit the WG180 transmission?
A: Yes, the WG180 uses the same M16 thread pattern and housing interface. However, verify the overall length (42 mm) matches your application, as some WG180 variants require a longer fastener.
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