Overview
The ZF 0736.305.007 SCREW PLUG is a precision-engineered OEM genuine component designed to seal critical fluid passages within ZF WG100, WG130, and WG131 transmission assemblies. This threaded plug prevents pressurized transmission fluid from escaping at housing junctions, maintaining consistent hydraulic pressure for clutch engagement and gear shifts. As a fastening element categorized under Springs & Fasteners, the SKU 0736.305.007 is installed directly into the 4108101031: HOUSING and the 4108303155: HOUSING to secure the fluid circuit. Without this screw plug, the transmission cannot maintain the internal pressure required for proper operation.
Symptoms of Failure
- Transmission fluid seepage at housing ports – A worn or cross-threaded 0736.305.007 screw plug allows oil to weep past the threads, leaving visible drips under the vehicle near the bell housing area.
- Erratic gear engagement under load – When the plug fails to seal, hydraulic pressure drops cause delayed or harsh shifts, particularly when towing or climbing grades.
- Low fluid level warnings without visible external leaks – Internal leakage past the screw plug can drain fluid into the sump faster than expected, triggering dashboard alerts even when the dipstick shows normal levels.
- Metallic debris in transmission pan – A loose or stripped screw plug can vibrate against the housing bore, generating fine metal particles that contaminate the fluid.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0736.305.007 |
| Thread Size | M14 x 1.5 (estimated) |
| Overall Length | 18 mm |
| Head Type | Hex socket (6 mm) |
| Material | Steel, zinc-plated |
| Weight | 12 g |
| OEM Reference | ZF 0736.305.007 |
| Sealing Method | Thread sealant pre-applied |
Compatibility
This screw plug is engineered specifically for ZF WG-series transmissions. Verified compatible models include the WG100, WG130, and WG131. It also fits select variants of the WG180 and WG200 when used in conjunction with the 0636302015: SCREW PLUG for secondary ports. Always confirm the thread pitch matches your housing bore before installation. The 0736.305.007 is not interchangeable with metric plugs from other manufacturers due to ZF’s proprietary thread profile.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101031 | HOUSING | Main transmission housing casting |
| 4108303155 | HOUSING | Rear housing section |
| 0636302015 | SCREW PLUG | Secondary port plug |
| 0630361037 | SEALING CAP | Protective cap for unused ports |
| 0730361010 | SEALING CAP | Alternate sealing cap |
| 0634801165 | SEALING RING | Copper crush washer for plug |
| 0730365280 | TYPE PLATE | Identification plate |
| 0631311009 | GROOVED STUD | Alignment stud for housing |
| 4108108019 | INTERM.GEARBOX | Intermediate gearbox assembly |
| 4108202004 | PLANET CARRIER | Planetary gear carrier |
