Overview
This ZF 0501.327.380 O-RING is a critical sealing component engineered for the WG100, WG130, and WG131 transmission series. Positioned within the hydraulic control circuit or differential housing interface, this OEM genuine part prevents pressurized fluid from bypassing critical passages. The SKU 0501.327.380 ensures a precise fit to maintain system pressure and lubrication integrity. When installed alongside a 5838109012: DIFFERENTIAL, this seal guarantees that the differential assembly remains properly lubricated under load.
Symptoms of Failure
- External oil seepage around the differential housing: A degraded 0501.327.380 O-RING allows transmission fluid to escape, leaving visible wet spots on the casing.
- Erratic gear engagement or delayed shifting: When this seal fails, internal pressure drops, causing the transmission to hesitate or slip between gears.
- Contaminated transmission fluid: A worn O-ring permits debris ingress, leading to dark, gritty fluid that accelerates wear on components like the 0750117075: TAPER ROLLER BEARING.
- Whining noise from the differential area: Loss of seal integrity reduces lubrication, causing metallic grinding sounds during operation.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0501.327.380 |
| Material | Nitrile Rubber (NBR) – 70 Shore A |
| Inner Diameter | 38.0 mm |
| Cross-Section | 3.5 mm |
| Weight | 0.005 kg |
| OEM Reference | ZF 0501.327.380 |
| Operating Temperature | -40°C to +120°C |
Compatibility
This O-ring is specifically engineered for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It also fits select variants of the WG180 and WG200 series where the differential housing interface shares identical sealing dimensions. For complete differential rebuilds, pair this seal with a 2093209023: DIFFERENTIAL and a 5838300626: DIFFERENTIAL HOUSING to ensure all mating surfaces are properly sealed.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque to drive axles |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads |
| 2093209023 | DIFFERENTIAL | Alternate differential assembly variant |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329088 | SPRING PIN | Secures gear alignment during assembly |
| 5838300811 | THRUST WASHER | Reduces axial friction between gears |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to wheel axles |
| 5838300633 | AXLE | Connects differential to wheel hubs |
| 5838300753 | THRUST WASHER | Controls gear end-play clearance |
| 5838300818 | THRUST WASHER | Provides wear surface for rotating components |
Frequently Asked Questions
Q: Can the 0501.327.380 O-RING be reused after disassembly?
No. ZF recommends replacing this seal whenever the differential housing is opened. The nitrile rubber compresses permanently during initial installation, and reuse risks immediate leakage.
Q: Does this O-ring fit the ZF WG180 transmission?
Yes, the 0501.327.380 is compatible with WG180 models that share the same differential housing bore diameter. Verify your housing part number against the 5838300626 specification to confirm fitment.
Q: What tools are needed to install this seal?
Installation requires only a seal pick for removal and a smooth drift for pressing. Lubricate the O-ring with clean transmission fluid before seating it into the groove to prevent rolling.
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