Overview
The ZF 4642.199.423 LOOSE PARTS kit is a critical service component designed specifically for the WG 150 Series transmission. This OEM genuine assembly includes all necessary fasteners, seals, and small hardware elements required to secure internal transmission components during a rebuild or major repair. Positioned within the main gear train housing, this kit ensures that the planetary gear sets and clutch packs remain properly torqued and aligned under extreme operational loads. The SKU 4642.199.423 is factory-matched to ZF’s exacting tolerances, eliminating the risk of using mismatched aftermarket hardware that can lead to premature wear. When paired with a replacement TRANSMISSION HOUSING (4642101047) or an updated TRANSMISSION HOUSING (4642301207), this loose parts set restores the structural integrity of the WG150 assembly.
Symptoms of Failure
- Oil leaks at housing joints: Worn or missing loose parts cause the transmission housing to separate slightly, allowing ATF to seep past gaskets. This is a common symptom when the 4642.199.423 kit’s bolts or washers have fatigued.
- Gear slipping under load: If the loose parts fail to maintain clamping force on the clutch pack, you may experience intermittent slipping, especially during upshifts in the WG150.
- Abnormal vibration or rattle: Loose hardware inside the transmission creates a distinct metallic rattle at idle or low RPM, indicating that the GROOVED STUD (0631311009) or similar fasteners have loosened.
- Delayed engagement: A failure in the loose parts assembly can cause the shift system to misalign, leading to a noticeable delay when shifting from Park to Drive or Reverse.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4642.199.423 |
| Material | Steel alloy with zinc plating (fasteners); nitrile rubber (seals) |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions | 180 mm x 120 mm x 40 mm (kit packaging) |
| OEM Reference | ZF 4642.199.423 |
| Torque Spec | 45 Nm ± 5 Nm (housing bolts) |
Compatibility
While the 4642.199.423 LOOSE PARTS kit is primarily engineered for the WG 150 Series, it also fits select variants of the WG180 and WG200 transmissions due to shared housing bolt patterns. Always verify your transmission’s serial number against the TYPE PLATE (0730365067) to confirm compatibility. This kit is not recommended for older WG120 models without a housing adapter. For WG150 rebuilds, it is commonly used alongside a SCREEN SHEET (4642301168) to ensure debris-free oil flow.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101047 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301207 | TRANSMISSION HOUSING | Alternate housing variant for WG150 |
| 0730365067 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Locating pin for housing alignment |
| 4642301168 | SCREEN SHEET | Oil filter screen for sump |
| 4642301169 | SCREEN SHEET | Fine mesh oil screen |
| 0636100621 | HEXAGON SCREW | Fastener for housing cover |
| 4642301186 | SCREEN SHEET | Secondary oil strainer |
| 4644106300 | SHIFT SYSTEM | Valve body and shift mechanism |
| 4644306500 | COVER PLATE | Sealing plate for access port |
