Overview
The ZF 6029.199.158 PLUG KIT is a critical sealing assembly designed specifically for the WG90 and WG94 series transmissions. This OEM genuine part ensures the integrity of the hydraulic circuit by providing a leak-proof closure at key access points within the transmission housing. The kit includes all necessary sealing elements and plugs required for a secure installation. When performing a rebuild or preventive maintenance on your ZF powershift transmission, replacing the 6029.199.158 kit is essential to prevent contamination ingress and fluid loss. This component works in conjunction with the 4661101032: TRANSMISSION HOUSING to maintain proper internal pressure, and it interfaces directly with the 4661301047: HOUSING II to secure the oil passages.
Symptoms of Failure
- External oil seepage around the plug bore: When the plug kit degrades, you will notice wet spots or drips forming on the exterior of the transmission housing, particularly near the access ports on the WG90 or WG94.
- Intermittent gear slippage under load: A failing plug kit can cause a gradual loss of hydraulic pressure, leading to clutch pack slippage during heavy operation or when shifting between forward and reverse.
- Contaminated transmission fluid: A compromised seal allows dirt and moisture to enter the system through the plug interface, resulting in dark, gritty fluid that accelerates wear on internal components like the 0631306174: CYLINDRICAL PIN.
- Audible whining or cavitation noise: Air ingestion through a worn plug kit creates a high-pitched whine from the pump, indicating that the system is losing prime and struggling to maintain flow.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 6029.199.158 |
| Material | Steel with Nitrile Rubber (NBR) Seals |
| Thread Size | M22 x 1.5 (Estimated) |
| Weight | 0.12 kg (0.26 lbs) |
| Seal Outer Diameter | 28 mm |
| Operating Temperature Range | -40°C to +120°C |
| Torque Specification | 45 Nm (33 ft-lbs) |
Compatibility
This plug kit is engineered for the ZF WG series powershift transmissions. It is a direct fit for the WG90 and WG94 models, which are commonly used in mobile construction equipment and material handlers. Based on the sealing geometry, it is also compatible with the WG180 and WG200 series transmissions that share the same housing architecture. The kit is designed to seal the oil gallery ports that connect to the 4661301093: TUBE assembly, ensuring uninterrupted fluid delivery to the clutch packs. Always verify your transmission model number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101032 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4661301047 | HOUSING II | Secondary housing for valve body and oil passages |
| 4661301093 | TUBE | Fluid transfer conduit between housing sections |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing assembly |
| 0769123894 | TYPE PLATE | Identification plate with transmission serial number |
| 0750100022 | SCREW PLUG | Threaded plug for auxiliary port sealing |
| 0636302602 | SCREW PLUG | Magnetic drain plug for ferrous debris collection |
| 0634100633 | O-RING | Static seal for flange and plug interfaces |
| 4661301041 | NOZZLE | Lubrication jet for gear mesh cooling |
| 4661301062 | NOZZLE | High-flow nozzle for clutch pack lubrication |
