Overview
This OEM genuine ZF 0634.306.309 O-RING is a precision-engineered sealing component designed for use in the WG171, WG190, and WG191 transmission series. It sits within the hydraulic control assembly, forming a critical barrier between mating surfaces to prevent fluid bypass and maintain system pressure. The SKU 0634.306.309 is manufactured to exacting OEM tolerances, ensuring a reliable seal in high-temperature, high-pressure environments. When installed alongside the 4143101016: HOUSING and 4143301039: HOUSING, this O-ring guarantees leak-free operation of the valve body and clutch pack circuits.
Symptoms of Failure
- External oil seepage around the transmission housing: A degraded 0634.306.309 O-ring allows transmission fluid to escape, leaving visible drips or wet spots near the joint between the 4143101016: HOUSING and the main case.
- Erratic gear engagement or delayed shifts: Internal pressure loss from a worn O-ring causes insufficient clutch pack application, resulting in slipping or harsh shifts under load.
- Low transmission fluid level without external leaks: A compromised seal can allow fluid to bypass internally into the torque converter or sump, mimicking a leak without visible drips.
- Overheating transmission due to reduced lubrication flow: When the O-ring fails, hydraulic circuits lose integrity, leading to inadequate cooling and elevated operating temperatures.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 0634.306.309 |
| Material | Nitrile Butadiene Rubber (NBR) / HNBR |
| Inside Diameter (approx.) | 34.5 mm |
| Cross-Section (approx.) | 3.0 mm |
| Weight | ~2 g |
| OEM Reference | ZF 0634.306.309 |
| Operating Temperature Range | -40°C to +120°C |
| Hardness (Shore A) | 70 ± 5 |
Compatibility
This O-ring is engineered for the following ZF transmission series: WG171, WG190, WG191, BP210, BP230, WG210, and WG211. It is also commonly used in the WG180 and WG200 variants where the same hydraulic housing design is employed. For a complete seal renewal, always pair this part with a new 0501318136: GASKET and inspect the 0636101084: CAP SCREW for proper torque during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101016 | HOUSING | Main valve body housing for hydraulic control |
| 4143301039 | HOUSING | Secondary housing for clutch piston assembly |
| 0501318136 | GASKET | Sealing gasket for housing mating surfaces |
| 0636101084 | CAP SCREW | Fastener for securing housing components |
| 0750108044 | PLUG | Threaded plug for hydraulic port sealing |
| 0636302014 | SCREW PLUG | Sealing screw plug for oil passages |
| 0634801057 | SEALING RING | Copper sealing ring for high-pressure joints |
| 0730365092 | TYPE PLATE | Identification plate for transmission model |
| 4143201019 | VALVE INSERT | Hydraulic valve insert for pressure regulation |
| 0634306198 | O-RING | Secondary O-ring for auxiliary circuits |
Frequently Asked Questions
Q: Can the 0634.306.309 O-ring be reused after disassembly?
A: No. ZF recommends replacing this O-ring with a new OEM part every time the housing is opened. Reuse risks immediate leakage due to compression set and micro-cracking.
Q: What torque specification should I use for the cap screw when installing this O-ring?
A: For the 0636101084: CAP SCREW, apply 25 Nm ± 2 Nm. Over-torquing can deform the O-ring and cause premature failure.
Q: Does this O-ring fit the ZF WG200 transmission?
A: Yes, the 0634.306.309 is compatible with WG200 models that use the same hydraulic housing design as the WG171 and WG190 series. Always verify your housing part number against the 4143101016: HOUSING to confirm fitment.
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ZF 0634.306.309 O-RING – O-Ring RFQ Support
PartsZF helps B2B buyers source ZF 0634.306.309 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 0634.306.309 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: INPUT HOUSING
- Illustration section: POWER TAKE OFF
- Illustration section: HOUSING
- Illustration section: documentation reference
Cross Reference Support
- Cross-reference record available for RFQ review.
Specification Snapshot
| ZF part number | 0634.306.309 |
|---|---|
| Normalized SKU | 0634306309 |
| Part name | O-RING |
| Product category | O-ring |
| Cross-reference support | Available for RFQ review |
| Weight | 0.004 |
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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