Overview
This OEM genuine ZF 0634.306.308 O-RING is a precision-engineered sealing component designed for the WG171, WG190, and WG191 transmission series. It sits within the hydraulic control circuit, forming a critical seal between the TRANSMISSION HOUSING and the HOUS.FRONT SECT. The SKU 0634.306.308 ensures a leak-proof barrier that maintains internal hydraulic pressure, preventing contamination and ensuring smooth gear engagement. Without this seal, the entire lubrication and cooling system is compromised.
Symptoms of Failure
- External oil seepage around the bell housing: A worn 0634.306.308 O-RING allows transmission fluid to escape, leaving visible drips or wet spots on the ground after parking.
- Erratic gear engagement or delayed shifts: Loss of hydraulic pressure due to a failing seal causes the transmission to hesitate or slip when shifting between forward and reverse gears.
- Low fluid level without visible external leaks: Internal bypassing of the O-RING can cause fluid to migrate into the torque converter housing, leading to unexplained fluid loss and overheating.
- Whining or humming noise from the transmission pump: Air ingestion through a degraded seal creates cavitation, producing a high-pitched sound during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0634.306.308 |
| Material | Nitrile Rubber (NBR) / Viton (estimated) |
| Inner Diameter (ID) | ~ 34.0 mm |
| Cross-Section (CS) | ~ 3.0 mm |
| Weight | ~ 5 grams |
| OEM Reference | ZF 0634.306.308 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This O-Ring is engineered for ZF WG and BP series transmissions. It is a direct fit for the following models: WG171, WG190, WG191, WG180, WG200, BP 210 Series, BP 230 Series, WG 210 Series, and WG 211 Series. It is also compatible with the SCREEN SHEET and TUBE assemblies found in these units. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101030 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656301066 | HOUS.FRONT SECT | Front section housing the pump and converter |
| 4656201015 | SCREEN SHEET | Filter mesh protecting hydraulic passages |
| 4656301037 | TUBE | Fluid transfer conduit between sections |
| 0634313514 | O-RING | Secondary sealing ring for valve body |
| 0636100803 | CAP SCREW | Fastener for housing assembly |
| 4656301064 | HOUSING REAR PART | Rear casing for output shaft support |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for component positioning |
| 0636100801 | CAP SCREW | Bolt for securing valve body cover |
| 0636100160 | CAP SCREW | Fastener for oil pan attachment |
Frequently Asked Questions
Q: Can I reuse the 0634.306.308 O-RING during a transmission rebuild?
A: No. ZF recommends replacing all O-rings, including this part, during any major service. Reusing a compressed seal risks immediate leakage and hydraulic pressure loss.
Q: Does this O-RING fit the ZF WG180 transmission?
A: Yes. The 0634.306.308 is a standard seal used across the WG171, WG180, WG190, and WG191 families. Always cross-reference your transmission model tag for confirmation.
Q: What tools are needed to replace this seal?
A: Basic hand tools and a seal pick are sufficient. The O-Ring sits between the TRANSMISSION HOUSING and HOUS.FRONT SECT, requiring removal of the front section for access.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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ZF 0634.306.308 O-RING – O-Ring RFQ Support
PartsZF helps B2B buyers source ZF 0634.306.308 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 0634.306.308 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Documentation reference: 4656073002
- Documentation reference: 4656073027
- Documentation reference: 4656073029
- Documentation reference: 4656073031
- Illustration section: POWER TAKE OFF
Cross Reference Support
- Cross-reference record available for RFQ review.
Specification Snapshot
| ZF part number | 0634.306.308 |
|---|---|
| Normalized SKU | 0634306308 |
| Part name | O-RING |
| Product category | O-ring |
| Cross-reference support | Available for RFQ review |
Image and Documentation Notes
Current product media status: fallback. 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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