Overview
The ZF 0634.100.843 SHAFT SEALING RING is a critical dynamic sealing component engineered for the output shaft and intermediate shaft interfaces within ZF WG-series powershift transmissions. This OEM genuine part prevents pressurized transmission fluid from migrating past rotating shafts, maintaining hydraulic integrity essential for clutch pack engagement and torque converter operation. The SKU 0634.100.843 sits directly within the transmission’s rear cover or adapter housing, where it seals the shaft bore against debris ingress and fluid egress. As a factory-specification component, it ensures proper lubrication film retention and prevents contamination of the hydraulic control system.
Symptoms of Failure
- Transmission fluid puddling under the bell housing or rear output flange – A worn 0634.100.843 allows ATF to weep past the shaft, often mistaken for a pan gasket leak.
- Erratic gear engagement or delayed shifting – Loss of hydraulic pressure from a leaking sealing ring starves clutch packs, causing soft shifts or slipping under load.
- Whining or chirping noise from the transmission housing – Insufficient lubrication due to seal failure leads to metal-on-metal contact at the shaft bushing.
- Low fluid level without visible external drips – The seal may leak internally into the torque converter housing, masking the source of fluid loss.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (OEM) | 0634.100.843 |
| Inner Diameter (Shaft) | 55 mm |
| Outer Diameter (Bore) | 72 mm |
| Width / Cross-Section | 10 mm |
| Material | Nitrile rubber (NBR) with steel spring reinforcement |
| Weight | 0.04 kg (40 g) |
| Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 0634.100.843 |
Compatibility
This shaft sealing ring is designed for ZF WG-series powershift transmissions, specifically the WG180, WG200, WG92, WG94, and WG98 models. It is a direct replacement for the original seal in the output shaft cavity of the TRANSMISSION HOUSING (part 4660101011) and the rear HOUSING (part 4660301018). The 0634.100.843 also interfaces with the PERIPHERALS assembly (part 4660198001) and works in conjunction with the RANGE SELECTOR (part 0501209818) to maintain consistent hydraulic pressure across all gear ranges.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631306174 | CYLINDRICAL PIN | Aligns and locates housing components during assembly |
| 0769123894 | TYPE PLATE | Identification plate riveted to transmission housing |
| 4660221012 | SUCTION TUBE | Draws fluid from sump to hydraulic pump |
| 0634100317 | O-RING | Static seal for cover and adapter plate joints |
| 0636103273 | CAP SCREW | Fastens housing halves with precise torque retention |
| 0750100022 | SCREW PLUG | Seals test ports and drain holes in the casing |
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