Overview
The ZF 4644.306.267 STOP is a precision-engineered mechanical stop component designed for the WG100, WG150, and WG180 series transmissions. This OEM genuine part functions as a positive travel limiter within the transmission’s shift mechanism, ensuring that the selector fork and associated linkage do not over-travel during gear engagement. By physically arresting movement at the correct endpoint, the 4644.306.267 STOP protects internal shift rails and prevents misalignment of the gear train. This part is frequently replaced during a full transmission overhaul, and it is often installed alongside a new 5838109012: DIFFERENTIAL to restore precise load distribution. The SKU 4644.306.267 is a direct OEM replacement, guaranteeing exact fitment and material hardness.
Symptoms of Failure
- Hard shifting or incomplete gear engagement: When the STOP wears or fractures, the shift fork can over-travel, causing the transmission to feel “sloppy” or fail to lock into gear completely.
- Metallic rattling from the shift housing: A loose or broken STOP allows the selector mechanism to vibrate against the housing, producing a distinct rattle at idle or during deceleration.
- Oil leaks near the shift tower: A cracked STOP can deform the shift housing seal surface, leading to gradual ATF seepage around the top cover of the WG series transmission.
- Intermittent gear slipping under load: If the STOP no longer holds the shift rail at the correct depth, the gear dog clutch may partially disengage, causing momentary power loss.
Technical Specifications
| OEM Part Number | 4644.306.267 |
| Material | Case-hardened steel (C45E, 58-62 HRC) |
| Overall Length | 38.5 mm |
| Width | 18.0 mm |
| Height | 12.2 mm |
| Weight | 0.045 kg |
| Surface Finish | Phosphate coated (MIL-DTL-16232) |
| OEM Reference | ZF 4644.306.267 |
Compatibility
This STOP is engineered for the ZF WG series of powershift transmissions. It is a direct fit for the WG100, WG150, WG180, WG200, and WG201 series. Within these models, the part is used in both standard and heavy-duty configurations. When rebuilding the shift assembly, it is recommended to also inspect the 0750117075: TAPER ROLLER BEARING and the 2093209023: DIFFERENTIAL for wear, as these components share the same lubrication circuit and load path. The 5838300626: DIFFERENTIAL HOUSING should also be checked for cracks if the STOP has failed catastrophically.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between output shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads on the shaft |
| 2093209023 | DIFFERENTIAL | Secondary differential for planetary gear sets |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329088 | SPRING PIN | Secures shift fork to the shift rail |
| 5838300811 | THRUST WASHER | Reduces axial friction between rotating gears |
| 5838300721 | AXLE BEVEL GEAR | Transfers power at a right angle in the differential |
| 5838300633 | AXLE | Carries the bevel gear and supports wheel hub |
| 5838300753 | THRUST WASHER | Controls end-play in the differential carrier |
| 5838300818 | THRUST WASHER | Provides wear surface for planetary gear thrust |
Frequently Asked Questions
Q: Can the 4644.306.267 STOP be reused if it appears undamaged?
No. This is a single-use component due to its role as a positive stop. Even microscopic deformation can alter shift travel. Always replace it with a new OEM part during any transmission rebuild.
Q: Does this STOP fit the WG180 transmission with a torque converter?
Yes. The 4644.306.267 is compatible with all WG180 variants, including those equipped with a torque converter. It mounts in the same shift housing location regardless of the converter configuration.
Q: What tools are needed to replace the STOP?
You will need a 10mm socket, a drift punch for the spring pin (0631329088), and a torque wrench set to 25 Nm for the retaining bolt. Always replace the 0631329088: SPRING PIN simultaneously to ensure proper retention.
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Phone: +86 158 2286 3467 |
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