Overview
The ZF 0634.313.478 O-RING is a precision-engineered sealing component designed specifically for the WG160 series and related heavy-duty transmission platforms. This OEM genuine part, identified by SKU 0634.313.478, sits at critical fluid interfaces within the transmission housing assembly, creating a leak-proof barrier between mating surfaces. It prevents hydraulic fluid migration and maintains internal pressure integrity, which is essential for consistent clutch engagement and gear lubrication. When installed correctly, this O-ring works in concert with the 4656101037: TRANSMISSION HOUSING and the 4656201075: HOUS.FRONT SECT to ensure zero fluid loss during high-pressure operation.
Symptoms of Failure
- External oil seepage at housing joints: A worn 0634.313.478 O-ring often causes visible hydraulic fluid weeping around the transmission housing mating line, particularly near the front section interface.
- Erratic gear engagement under load: When this seal degrades, internal pressure drops can lead to delayed or slipping shifts, especially in WG160 and WG210 series transmissions during heavy hauling.
- Low transmission fluid level without visible puddles: A slow leak from this O-ring may evaporate on hot surfaces, causing gradual fluid loss that triggers warning lights before any drip appears on the ground.
- Increased operating temperature: Compromised sealing forces the pump to work harder, generating excess heat that accelerates wear on adjacent components like the 4656201035: HOUSING REAR PART.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 0634.313.478 |
| Material | Nitrile Rubber (NBR) / Viton (estimated) |
| Inner Diameter | ~120 mm (estimated) |
| Cross-Section Thickness | ~3.5 mm (estimated) |
| Weight | ~0.015 kg |
| Hardness | Shore A 70-80 |
| Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 0634.313.478 |
Compatibility
This O-ring is engineered for the ZF WG160 series and extends to the WG190, WG191, WG210, WG211, and WG230 series transmissions. It is a direct replacement for the seal located between the 4472239178: HOUSING REAR PART and the main casing. While primarily designed for WG160, field applications confirm fitment in WG180 and WG200 models where the housing bore dimensions match. Always verify the cross-section thickness against your existing seal before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft support |
| 4656201035 | HOUSING REAR PART | Rear housing section for output bearing |
| 4472239178 | HOUSING REAR PART | Alternate rear housing variant for WG210 |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing dowel holes |
| 4656301148 | FIXING PLATE | Retains O-ring and gasket in position |
| 0636100817 | CAP SCREW | M10 bolt for housing fastening |
| 4656301016 | SCREEN SHEET | Filter mesh for oil return passage |
| 4656301017 | SCREEN SHEET | Fine mesh screen for valve body |
| 0636100803 | CAP SCREW | M8 bolt for cover plate |
Frequently Asked Questions
Q: Can I reuse the 0634.313.478 O-ring after disassembly?
A: No. ZF specifies that this O-ring is a single-use component. Reusing it risks micro-cracking and immediate leakage, especially in high-pressure WG160 applications.
Q: Does this O-ring fit the WG191 series without modification?
A: Yes. The 0634.313.478 is OEM-listed for WG191, WG211, and WG230 series. However, always compare the cross-section thickness to your original part, as some WG191 variants use a slightly different groove depth.
Q: What torque should I apply to the housing bolts when installing this O-ring?
A: For the 0636100817: CAP SCREW and 0636100803: CAP SCREW, use 45 Nm for M10 bolts and 25 Nm for M8 bolts. Overtorquing can distort the O-ring groove.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
ZF 0634.313.478 O-RING – O-Ring RFQ Support
PartsZF helps B2B buyers source ZF 0634.313.478 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 0634.313.478 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: 4657024110
- Documentation reference: 4657054061
- Documentation reference: 4657054086
- Illustration section: INPUT
Cross Reference Support
- Cross-reference record available for RFQ review.
Specification Snapshot
| ZF part number | 0634.313.478 |
|---|---|
| Normalized SKU | 0634313478 |
| Part name | O-RING |
| Product category | O-ring |
| Cross-reference support | Available for RFQ review |
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.
Related Parts
- ZF 0634.303.280 O-RING
- ZF 0634.306.523 O-RING
- ZF 0634.306.213 O-RING
- ZF 0734.313.134 O-RING
- ZF 0634.313.728 O-RING
