Overview
The ZF 0734.401.296 RECTANGULAR RING is a precision-engineered sealing component designed for the WG200, WG92, and related series of off-highway transmissions. This OEM genuine part sits at critical interface points within the transmission housing, providing a robust barrier against fluid migration and contamination ingress. The SKU 0734.401.296 is specifically profiled to match the unique groove geometry found in ZF’s modular transmission architecture, ensuring a positive seal between mating surfaces under high-pressure and high-temperature operating conditions. As a rectangular cross-section ring, it offers superior resistance to extrusion compared to standard O-rings, making it essential for maintaining hydraulic integrity in heavy-duty applications.
Symptoms of Failure
- External oil seepage at transmission housing joints – When the 0734.401.296 rectangular ring degrades, operators often notice fluid weeping around the mating flanges of the TRANSMISSION HOUSING, particularly after extended idle periods.
- Intermittent gear engagement hesitation – A worn ring can allow pressure loss in the clutch apply circuits, leading to delayed or rough shifts during directional changes.
- Contaminated transmission fluid – Failure of this seal permits dirt and moisture to bypass the HOUSING interface, resulting in accelerated wear of internal components and darkening of the oil.
- Reduced hydraulic system pressure – A compromised rectangular ring creates internal leakage paths, causing the RANGE SELECTOR to struggle with maintaining proper shift pressures.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0734.401.296 |
| Cross-Section Shape | Rectangular |
| Inner Diameter (Nominal) | 296.0 mm |
| Cross-Section Width | 4.5 mm |
| Cross-Section Height | 3.2 mm |
| Material | Nitrile Rubber (NBR) with PTFE coating |
| Hardness (Shore A) | 85 ± 5 |
| Operating Temperature Range | -40°C to +120°C |
| Weight | 0.045 kg |
| OEM Reference | ZF 0734.401.296 |
Compatibility
This rectangular ring is engineered for ZF’s WG series powershift transmissions, specifically the WG180, WG200, WG92, WG94, and WG98 models. It is commonly used in the output flange area and the PTO housing interface. The part also integrates with the PERIPHERALS assembly, where it seals the hydraulic pump drive cavity. For proper installation, ensure the mating surfaces on the transmission housing are clean and free of burrs. Always replace this ring when servicing the range selector or performing a major overhaul of the clutch pack assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing positioning |
| 0769123894 | TYPE PLATE | Identification tag for transmission model |
| 4660221012 | SUCTION TUBE | Oil pickup conduit from sump to pump |
| 0634100317 | O-RING | Static seal for suction tube connection |
| 0636103273 | CAP SCREW | Fastener for housing cover retention |
| 0750100022 | SCREW PLUG | Port closure for test points |
