Overview
The ZF 0734.401.207 RECTANGULAR RING is a precision-engineered sealing component designed specifically for the WG 200 Series transmission. Positioned between the transmission housing and the valve body assembly, this OEM genuine part ensures a leak-proof seal under high-pressure hydraulic conditions. The SKU 0734.401.207 is critical for maintaining proper fluid containment within the clutch and shift circuits, preventing contamination and pressure loss. When installed alongside the 4644101216 TRANSMISSION HOUSING or the 4644301223 TRANSMISSION HOUSING, this rectangular ring completes the sealing interface for the hydraulic control system.
Symptoms of Failure
- Hydraulic fluid seepage at the housing joint: A worn 0734.401.207 rectangular ring often causes visible oil leaks around the transmission housing mating surface, especially during cold starts or after extended operation.
- Erratic gear engagement or delayed shifts: When the ring loses its cross-sectional integrity, internal pressure drops lead to slipping between gears, particularly in the WG200’s forward clutch packs.
- Transmission overheating due to fluid loss: Gradual fluid loss from a degraded rectangular ring forces the system to run low on lubrication, triggering thermal warnings or burnt clutch odors.
- Contaminated transmission fluid with debris: A cracked or hardened ring allows external dirt to bypass the seal, resulting in gritty fluid that accelerates wear on the 0631311009 GROOVED STUD and valve body components.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0734.401.207 |
| Type | Rectangular Ring (O-Ring Profile) |
| Material | Nitrile Butadiene Rubber (NBR) 70 Shore A |
| Cross-Section | 3.5 mm x 5.0 mm (nominal) |
| Inside Diameter | 120.0 mm |
| Outside Diameter | 130.0 mm |
| Weight | 0.012 kg |
| OEM Reference | ZF 0734.401.207 |
| Operating Temperature Range | -30°C to +120°C |
| Pressure Rating | Up to 15 bar (static seal) |
Compatibility
This rectangular ring is primarily designed for the ZF WG 200 Series transmissions, including models WG180, WG200, and WG210. It is also compatible with certain WG 150 variants that share the same housing interface. The part directly replaces the seal in the valve body-to-housing joint and is frequently ordered with the 0730365067 TYPE PLATE for identification during rebuilds. For complete housing assembly, pair it with the 4644303060 COVER PLATE or 4644303061 COVER PLATE to ensure proper sealing of the transmission sump.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101216 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301223 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Fastener for housing alignment |
| 4644303060 | COVER PLATE | Seals the transmission sump opening |
| 4644303061 | COVER PLATE | Alternate sump cover plate |
| 0634306525 | O-RING | Static seal for hydraulic passages |
| 0636305026 | SCREW PLUG | Drain or fill port closure |
| 4644301279 | SCREEN SHEET | Filter mesh for fluid intake |
| 4644301088 | SEALING CAP | Protects unused ports from debris |
