Overview
The ZF 0750.108.986 SCREW PLUG is a critical sealing component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part, identified by SKU 0750.108.986, functions as a threaded closure that seals oil passages and inspection ports within the transmission housing. Positioned directly in the main casing, it prevents fluid contamination and maintains hydraulic pressure integrity. When installed alongside the 4699101152: HOUSING and 4699309059: HOUSING COVER, this screw plug ensures a leak-proof seal that protects internal gear assemblies from debris ingress.
Symptoms of Failure
When the 0750.108.986 screw plug wears out or becomes damaged, operators may notice these specific failure indicators:
- Oil seepage around the plug threads – Visible fluid accumulation near the transmission housing, often mistaken for gasket failure.
- Hydraulic pressure fluctuations – Inconsistent shift quality or delayed engagement due to air ingress through a compromised seal.
- Contaminated transmission fluid – Dirt or moisture entering through a loose or stripped plug, causing accelerated wear on bearings and gears.
- Vibration or rattling at the plug location – A loose screw plug may create audible noise during operation, indicating it requires immediate replacement.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0750.108.986 |
| Material | Steel, zinc-plated for corrosion resistance |
| Thread Size | M18 x 1.5 (estimated) |
| Overall Length | 22 mm |
| Hex Head Size | 17 mm (AF) |
| Weight | 0.04 kg |
| OEM Reference | ZF 0750.108.986 |
| Sealing Method | Copper washer or O-ring (not included) |
Compatibility
This screw plug is engineered for the following ZF transmission models: WG100, WG130, and WG131. It also fits select variants of the WG180 and WG200 series when used in oil drain or fill port applications. For proper installation, ensure the mating surface on the 4699309059: HOUSING COVER is clean and free of debris. The plug works in conjunction with the 0636101411: CAP SCREW for securing adjacent components and the 0631302212: CYLINDRICAL PIN for alignment during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101152 | HOUSING | Main transmission casing that contains gears and shafts |
| 4699309059 | HOUSING COVER | Seals the transmission housing and supports bearing bores |
| 0636101411 | CAP SCREW | Fastens housing cover to main casing |
| 0631302212 | CYLINDRICAL PIN | Aligns housing components during assembly |
| 0636302013 | SCREW PLUG | Alternate plug for different port sizes |
| 0634801038 | SEALING RING | Provides leak-proof seal under plug head |
| 0769100082 | TYPE PLATE | Identification plate for transmission model |
| 0637885613 | BREATHER | Equalizes internal pressure and vents moisture |
| 4699102187 | INPUT | Input shaft assembly for torque transfer |
| 4699302337 | DRIVE PINION | Primary gear that drives the transmission |
