Overview
The ZF 0634.306.189 O-RING is a critical sealing component engineered for the WG160, WG190, WG210, and WG211 series transmissions. This OEM genuine part sits within the hydraulic control circuit and differential housing assembly, where it prevents pressurized oil from bypassing critical passages. The SKU 0634.306.189 ensures a leak-free seal between mating surfaces, maintaining consistent lubrication pressure to the 2095109012: DIFFERENTIAL and surrounding gear sets. Without this precise elastomeric seal, internal fluid dynamics become compromised, leading to performance degradation across the entire drivetrain.
Symptoms of Failure
- External oil seepage at the differential housing joint – A worn 0634.306.189 O-RING allows transmission fluid to escape, leaving visible drips or wet spots beneath the vehicle, particularly after extended operation.
- Erratic gear engagement or delayed shifting – When the seal fails, hydraulic pressure drops inside the valve body, causing sluggish clutch pack application and inconsistent shift timing in WG190 and WG210 units.
- Whining noise from the differential area – Loss of seal integrity permits air ingestion into the oil circuit, leading to cavitation and audible whining or chattering from the 2095209037: DIFFERENTIAL assembly.
- Overheating transmission fluid – A leaking O-ring reduces oil volume, impairing heat dissipation and causing the transmission to run hotter than normal, which accelerates wear on internal components.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0634.306.189 |
| Material | Nitrile Rubber (NBR) / FKM |
| Inner Diameter | ~34.5 mm |
| Cross-Section | ~3.5 mm |
| Weight | ~0.005 kg |
| OEM Reference | ZF 0634.306.189 |
| Operating Temperature | -40°C to +120°C |
Compatibility
This genuine ZF O-ring is specifically designed for the WG160, WG190, WG210, and WG211 series transmissions. It also fits the WG180 and WG200 models where the differential housing interface shares identical sealing geometry. The part is commonly replaced during overhaul of the 2095309059: DIFF.HOUSING or when servicing the 0750117075: TAPER ROLLER BEARING assembly. Always verify the seal groove condition before installation to ensure proper compression.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2095109012 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports rotating differential gears |
| 2095209037 | DIFFERENTIAL | Secondary torque distribution unit |
| 2095309059 | DIFF.HOUSING | Encloses differential gear set |
| 0631329086 | SPRING PIN | Secures shift fork alignment |
| 0730300820 | THRUST WASHER | Reduces axial friction |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel axles |
| 2095309081 | DIFFERENTIAL AXLE | Connects differential to wheel hub |
| 5838300811 | THRUST WASHER | Controls end-play in gear stack |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Changes torque direction in diff |
Frequently Asked Questions
Q: How do I know if the 0634.306.189 O-ring needs replacement?
A: Inspect for visible cracks, flattening, or hardening of the rubber. If you notice oil residue around the differential housing mating line or experience low hydraulic pressure codes, replace this seal immediately.
Q: Can this O-ring be reused after disassembly?
A: No. ZF recommends always installing a new 0634.306.189 O-ring whenever the differential housing or valve body is opened. The elastomer takes a compression set and will not reseal reliably.
Q: Is this part compatible with synthetic transmission fluids?
A: Yes. The NBR/FKM compound resists degradation from mineral and synthetic oils used in WG160 through WG211 transmissions. Always confirm fluid type with your OEM specifications.
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Phone: +86 158 2286 3467 |
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ZF 0634.306.189 O-RING – O-Ring RFQ Support
PartsZF helps B2B buyers source ZF 0634.306.189 O-RING with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This O-ring page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 0634.306.189 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Documentation reference: 4657023003
- Documentation reference: 4657054061
- Documentation reference available for RFQ review
- Illustration section: TRANSMISSION HOUSING
- Illustration section: CONTROL UNIT
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 0634.306.189 |
|---|---|
| Normalized SKU | 0634306189 |
| Part name | O-RING |
| Product category | O-ring |
| Cross-reference support | Available for RFQ review |
| Weight | 0.04 |
Image and Documentation Notes
Current product media status: diagram. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
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