Overview
The ZF 0634.306.299 O-RING is a critical static sealing component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part creates a leak-proof barrier between mating surfaces within the valve body and hydraulic control assembly. Specifically, it seats within the 4143101009: HOUSING and the 4143301025: HOUSING to prevent pressurized transmission fluid from escaping. The SKU 0634.306.299 is manufactured to ZF’s exacting tolerances, ensuring proper compression and sealing under high-temperature, high-pressure operating conditions. Without this O-ring, internal hydraulic circuits lose integrity, leading to pressure drops that affect shift quality and clutch application.
Symptoms of Failure
- External transmission fluid leaks — Visible oil drips or wet spots around the housing mating surfaces, particularly near the valve body interface where the 0634.306.299 O-RING resides.
- Erratic or delayed gear engagement — When this seal fails, hydraulic pressure bleeds off, causing hesitation when shifting from Neutral to Drive or Reverse, especially in WG100 and WG130 units.
- Low transmission fluid level without visible external leaks — Internal cross-leakage past the O-ring can allow fluid to migrate into adjacent cavities, causing unexplained fluid loss and potential overheating.
- Harsh shift quality — A worn or flattened O-ring disrupts the precise pressure modulation required for smooth clutch pack engagement, resulting in jarring upshifts or downshifts.
Technical Specifications
| Part Number | 0634.306.299 |
| Inner Diameter (ID) | 18.0 mm (estimated) |
| Cross-Section (CS) | 2.5 mm (estimated) |
| Material | Nitrile Rubber (NBR) – 70 Shore A |
| Weight | 2 grams |
| OEM Reference | ZF 0634.306.299 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This O-ring is specifically designed for ZF WG-series transmissions. It is a direct fit for the following models: WG100, WG130, and WG131. It is also commonly used in the hydraulic control circuits of the WG180 and WG200 series where identical housing geometries are employed. Always verify your transmission serial number against the OEM parts catalog to confirm application. When replacing this seal, it is recommended to also inspect the 0634313603: O-RING and the 4475280018: SCREW PLUG for simultaneous wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Main valve body housing for hydraulic control |
| 4143301025 | HOUSING | Secondary housing for clutch pressure regulation |
| 0634313603 | O-RING | Seal for adjacent hydraulic passage |
| 4475280018 | SCREW PLUG | Threaded plug for test port sealing |
| 0501342341 | SUPPORT RING | Backup ring to prevent O-ring extrusion |
| 4143298457 | SEAL KIT | Complete overhaul seal package |
| 0634313591 | O-RING | Secondary seal for accumulator piston |
| 0636101068 | CAP SCREW | Fastener for housing retention |
| 4143221013 | THROTTLE VALVE | Pressure modulation spool valve |
| 0634304484 | O-RING | Seal for throttle valve bore |
ZF 0634.306.299 O-RING – O-Ring RFQ Support
PartsZF helps B2B buyers source ZF 0634.306.299 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 0634.306.299 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: OUTPUT
- Illustration section: LUBE OIL PUMP
- Illustration section: GEAR SHIFT SENSOR
- Illustration section: KIT REPAIR KIT
Cross Reference Support
- Cross-reference record available for RFQ review.
Specification Snapshot
| ZF part number | 0634.306.299 |
|---|---|
| Normalized SKU | 0634306299 |
| Part name | O-RING |
| Product category | O-ring |
| Cross-reference support | Available for RFQ review |
| Weight | 0.003 |
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
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- ZF 0634.306.523 O-RING
- ZF 0634.306.213 O-RING
- ZF 0734.313.134 O-RING
- ZF 0634.313.728 O-RING
