Overview
The ZF 0737.835.184 UNION SCREW is a critical hydraulic sealing and connection component engineered specifically for the WG150 transmission series. This OEM genuine part functions as a high-pressure port fitting, ensuring leak-free fluid transfer between the valve body and clutch circuits. The SKU 0737.835.184 sits within the transmission’s hydraulic control assembly, where it secures fluid lines to the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING. Without this union screw, hydraulic pressure cannot be maintained, leading to immediate operational failure.
Symptoms of Failure
When the 0737.835.184 UNION SCREW wears out or becomes damaged, operators typically observe these specific failure indicators:
- External hydraulic oil leaks at the union screw port – A common long-tail search query: “ZF transmission oil leak near valve body union screw.”
- Erratic gear engagement or slipping under load – Loss of hydraulic pressure causes delayed clutch pack activation.
- Visible thread stripping or corrosion on the screw body – Often found during routine inspection of the 0730365125: TYPE PLATE area.
- Contaminated transmission fluid due to debris ingress – A compromised seal allows particles to enter the hydraulic circuit.
Technical Specifications
| Part Number | 0737.835.184 |
| Product Type | Union Screw (Hydraulic Port Fitting) |
| Material | Case-hardened steel with zinc-nickel plating |
| Thread Size | M14 x 1.5 (estimated) |
| Hex Size | 17mm (estimated) |
| Overall Length | 32 mm (estimated) |
| Weight | 0.04 kg (estimated) |
| OEM Reference | ZF 0737.835.184 |
| Torque Specification | 25 Nm (estimated, verify with service manual) |
Compatibility
This ZF 0737.835.184 UNION SCREW is primarily designed for the WG150 series transmissions. Based on its hydraulic port configuration, it is also compatible with the WG180 and WG200 models that share the same valve housing architecture. The screw interfaces directly with the 0631311009: GROOVED STUD to secure the assembly. Always cross-reference your transmission’s serial number against the 0730365125: TYPE PLATE to confirm fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4642301205 | TRANSMISSION HOUSING | Secondary housing for valve body |
| 0730365125 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for housing assembly |
| 4642301168 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4642301169 | SCREEN SHEET | Secondary filter element |
| 0636100621 | HEXAGON SCREW | Fastener for valve body cover |
| 4642301186 | SCREEN SHEET | Suction filter screen |
| 4644159321 | SHIFT SYSTEM | Electro-hydraulic shift actuator |
| 4644306565 | VALVE HOUSING | Hydraulic control manifold |
