Overview
The ZF 0734.401.299 RECTANGULAR RING is a precision-engineered sealing component designed specifically for the WG92 and WG98 series transmissions. This OEM genuine part sits between the transmission housing and the valve body or cover plate, creating a critical static seal that prevents pressurized oil from bypassing internal circuits. The rectangular cross-section of this ring provides superior sealing surface area compared to standard O-rings, ensuring consistent hydraulic pressure within the clutch and shift assemblies. The SKU 0734.401.299 is manufactured to ZF’s exacting tolerances, guaranteeing a perfect fit and long service life in heavy-duty industrial applications.
Symptoms of Failure
- External oil leaks at the housing interface: When the 0734.401.299 rectangular ring hardens or cracks, transmission fluid seeps past the seal, often visible as drips around the WG92 or WG98 housing joint. This is a common long-tail search query for “ZF transmission oil leak between housing and valve body.”
- Delayed or harsh gear engagement: A worn rectangular ring allows internal pressure loss, causing clutches to engage slowly or with a jarring shift. Operators may notice “ZF WG200 slipping in forward gears” as a symptom.
- Overheating transmission fluid: Loss of sealing integrity forces the pump to work harder, generating excess heat. This can trigger warning lights or burnt fluid smell, matching searches like “ZF transmission overheating after seal replacement.”
- Intermittent loss of drive: In severe cases, the ring failure causes complete pressure drop in a specific circuit, leading to temporary loss of power under load—a critical issue for construction equipment.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0734.401.299 |
| Type | Rectangular Ring (Static Seal) |
| Material | Nitrile Rubber (NBR) / HNBR |
| Cross-Section Shape | Rectangular |
| Inner Diameter (approx.) | 120 mm |
| Outer Diameter (approx.) | 130 mm |
| Width (approx.) | 5 mm |
| Weight | 0.02 kg |
| OEM Reference | ZF 0734.401.299 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This rectangular ring is a direct fit for the ZF WG92 and WG98 transmission series. Based on its sealing application, it is also compatible with the following ZF models that share the same housing interface design: WG180, WG200, WG210, and WG250. Always verify the housing part number before installation—the ring seats against the 4660101023: TRANSMISSION HOUSING and the 4660301058: HOUSING assembly. For secure mounting, use the 0631306174: CYLINDRICAL PIN for alignment and the 0750100022: SCREW PLUG to seal any access ports during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101023 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4660301058 | HOUSING | Secondary housing cover for valve body section |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing positioning |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports and drain holes |
| 4660301009 | BRACKET | Mounting support for transmission accessories |
| 4660221039 | TUBE | Oil delivery conduit between pump and valve body |
| 0636103274 | CAP SCREW | Fastener for securing housing components |
| 0634306185 | O-RING | Secondary seal for tube and plug connections |
| 4660221041 | TUBE | Oil return line from cooler to transmission |
| 4660221040 | TUBE | Pressure feed tube for clutch pack actuation |
