Overview
The ZF 6029.201.707 PLUG is a critical sealing component engineered specifically for the WG92 and WG98 transmission series. This OEM genuine part functions as a hydraulic or oil gallery plug, ensuring that transmission fluid remains contained within the valve body or housing assembly under high pressure. The SKU 6029.201.707 is precision-machined to maintain the internal pressure necessary for proper clutch pack engagement and gear shifts. It sits directly within the main casting, often adjacent to the TRANSMISSION HOUSING and the HOUSING II, forming a sealed boundary that prevents cross-contamination between fluid circuits.
Symptoms of Failure
- External oil seepage around the transmission case: A worn or loose 6029.201.707 plug allows pressurized ATF to escape, leaving visible drips or wet spots on the bell housing and undercarriage.
- Erratic or delayed gear engagement: When the plug fails to seal, hydraulic pressure drops, causing soft shifts or hesitation when moving from Neutral to Drive or Reverse.
- Low transmission fluid level without visible line leaks: Internal weeping past the plug can lead to gradual fluid loss, triggering warning lights or burnt clutch smells before external puddles appear.
- Whining or cavitation noise from the pump: Air ingestion through a compromised plug seat introduces aeration, producing a high-pitched whine during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 6029.201.707 |
| Material | Steel with zinc-nickel plating |
| Thread Size | M18 x 1.5 (estimated) |
| Overall Length | 22 mm |
| Head Diameter | 24 mm |
| Weight | 0.045 kg |
| Sealing Method | Integrated O-ring groove |
| OEM Reference | ZF 6029.201.707 |
Compatibility
This plug is a direct fit for the ZF WG92 and WG98 transmission families. It is commonly used in the WG180, WG200, and WG210 models found in off-highway trucks, wheel loaders, and heavy-duty agricultural equipment. The part also interfaces with the CYLINDRICAL PIN that aligns the valve body, and it is installed beneath the TYPE PLATE that identifies the transmission variant. Always verify the thread pitch and depth against your specific housing casting before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Main structural casing that contains the gearset and valve body |
| 4660301054 | HOUSING II | Secondary housing section for clutch pack and piston assembly |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing-to-valve body positioning |
| 0769123894 | TYPE PLATE | Identification plate riveted to the housing with model and serial data |
| 0750100022 | SCREW PLUG | Alternate sealing plug for auxiliary ports on the housing |
| 4660221029 | SUCTION TUBE | Oil pick-up tube that draws fluid from the pan to the pump |
| 0634100317 | O-RING | Primary seal for the suction tube connection |
| 0636103273 | CAP SCREW | Fastener for securing the valve body to the housing |
| 0634306311 | O-RING | Seal for the cap screw bore to prevent fluid bypass |
| 4660321029 | FIXING PLATE | Retaining plate that locks the plug in position against vibration |
