Overview
This OEM genuine ZF 0634.316.217 O-RING is a critical sealing component engineered specifically for the WG 191 and WG 211 transmission series. Positioned within the hydraulic control circuit, this precision-molded elastomer ring prevents pressurized transmission fluid from bypassing critical junctions between the valve body and housing assemblies. The SKU 0634.316.217 ensures a leak-proof seal that maintains consistent clutch pack engagement pressure and lubrication flow. When installed alongside the 4143101033 HOUSING and the 4143301055 HOUSING, this O-ring forms a complete sealing boundary that protects internal gear sets from contamination and fluid starvation.
Symptoms of Failure
- Transmission fluid seepage at housing joints – A worn 0634.316.217 O-ring allows thin oil films to escape between the 4143298040 CASE and mating surfaces, often visible as wet streaks on the transmission exterior.
- Delayed or harsh gear engagement – When this seal fails, hydraulic pressure drops inside the valve body, causing sluggish shifts or abrupt clutch application during acceleration.
- Low line pressure warnings on diagnostic tools – Internal leakage past a degraded O-ring reduces pump output pressure, triggering fault codes related to clutch slip or torque converter lockup.
- Overheating transmission fluid – Fluid bypassing the seal generates excessive heat through friction, leading to burnt-smelling oil and potential thermal damage to nearby components.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 0634.316.217 |
| Inside Diameter | 14.0 mm (estimated) |
| Cross-Section Thickness | 2.5 mm (estimated) |
| Material | Nitrile Rubber (NBR) – 70 Shore A |
| Operating Temperature Range | -40°C to +120°C |
| Weight | ~2 grams |
| OEM Reference | ZF 0634.316.217 |
Compatibility
This O-ring is a direct replacement for ZF WG 191 and WG 211 series transmissions. It also fits select WG 180, WG 200, and WG 210 variants where the hydraulic housing interface uses identical groove dimensions. Always verify the part number 0634.316.217 against your transmission’s seal kit diagram before installation. The seal works in conjunction with the 0631329135 SPRING PIN to secure alignment during assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101033 | HOUSING | Encloses valve body and supports O-ring sealing surface |
| 4143301055 | HOUSING | Secondary housing for hydraulic control passages |
| 4143298040 | CASE | Main transmission case that houses gear train |
| 0631329135 | SPRING PIN | Secures housing alignment during bolt torque |
| 0636101024 | CAP SCREW | Fastens housing to transmission case |
| 4475280099 | SCREW PLUG | Seals hydraulic test ports |
| 0634303266 | O-RING | Secondary seal for auxiliary circuits |
| 4143301045 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 0636420051 | COUNTERSUNK SCREW | Low-profile fastener for valve body |
| 0501200072 | VENT VALVE | Equalizes internal pressure during operation |
Frequently Asked Questions
Q: How do I know if the 0634.316.217 O-ring is the correct size for my WG191?
A: Measure the groove depth and diameter in your housing. This O-ring has an estimated 14.0 mm inside diameter and 2.5 mm cross-section. Always cross-reference with your transmission’s parts manual to confirm compatibility.
Q: Can I reuse this O-ring if it appears undamaged?
A: No. ZF recommends replacing all O-rings during any transmission overhaul. The 0634.316.217 loses elasticity over time, and reusing it risks internal fluid leakage that can damage the 4143298040 CASE and adjacent components.
Q: What tools are needed to install this O-ring?
A: Basic hand tools and a seal installation tool are sufficient. Lubricate the O-ring with clean transmission fluid before seating it in the groove. Ensure the 0631329135 SPRING PIN is properly aligned to prevent pinching the seal during housing assembly.
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ZF 0634.316.217 O-RING – O-Ring RFQ Support
PartsZF helps B2B buyers source ZF 0634.316.217 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 0634.316.217 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Documentation reference: 4657033001
- Documentation reference: 4657033002
- Documentation reference: 4657033003
- Documentation reference: 4657033005
- Illustration section: VALVE BLOCK
- Illustration section: TRANSMISSION HOUSING
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 | 0634.316.217 |
|---|---|
| Normalized SKU | 0634316217 |
| Part name | O-RING |
| Product category | O-ring |
| Cross-reference support | Available for RFQ review |
| Weight | 0.002 |
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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