Overview
The ZF 4642.199.774 LOOSE PARTS for WG150 is a critical service kit designed to restore the internal integrity of your ZF WG150 transmission. This OEM genuine assembly includes essential fasteners, seals, and positioning components that secure the valve body and hydraulic control circuits within the main casing. Specifically, the 4642.199.774 kit ensures that loose internal hardware does not migrate, preventing cross-port leakage and maintaining precise clutch engagement pressures. When installed alongside a TRANSMISSION HOUSING (4642101109) or a TRANSMISSION HOUSING (4642301205), this loose parts set guarantees that all internal clearances remain within factory tolerances. The SKU 4642.199.774 is a mandatory replacement item during any major WG150 overhaul to avoid premature wear of the shift system.
Symptoms of Failure
- Intermittent gear slipping under load: When the loose parts kit degrades, internal fasteners can loosen, causing valve body movement and erratic hydraulic pressure. This often manifests as a “ZF WG150 slipping in third gear” condition.
- External oil seepage at housing joints: Worn or missing components from the 4642.199.774 set can compromise the seal between the main case and the TYPE PLATE (0730365125), leading to visible drips around the bell housing area.
- Harsh or delayed engagement: A failure of the retaining hardware allows the shift rail to shift out of alignment. Operators often report a “hard shift from neutral to drive” as the first warning sign.
- Unusual metallic rattling from the transmission pan: If a GROOVED STUD (0631311009) or similar fastener breaks free, it can circulate inside the sump, producing a distinct noise during acceleration.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4642.199.774 |
| OEM Reference | ZF WG150 Loose Parts Kit |
| Material Composition | Case-hardened steel (fasteners), nitrile rubber (seals) |
| Weight | 0.45 kg (1.0 lb) |
| Kit Contents | 6x retaining clips, 4x sealing washers, 2x positioning dowels |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This 4642.199.774 loose parts kit is specifically engineered for the ZF WG150 series, but its hardware design also cross-references to the WG180 and WG200 models due to shared valve body architecture. It is fully compatible with all WG150 variants produced after 1998, including the WG150-5 and WG150-6. For installations involving a SHIFT SYSTEM (4644106300) or a COVER PLATE (4644306500), this kit provides the necessary retention hardware. Always verify that your transmission serial number falls within the WG150 family before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for WG150 |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment dowel for housing assembly |
| 4642301168 | SCREEN SHEET | Oil filter mesh for hydraulic circuit |
| 4642301169 | SCREEN SHEET | Fine filtration screen for valve body |
| 0636100621 | HEXAGON SCREW | Fastener for cover plate attachment |
| 4642301186 | SCREEN SHEET | Secondary oil strainer element |
| 4644106300 | SHIFT SYSTEM | Complete gear selection mechanism |
| 4644306500 | COVER PLATE | Access cover for shift system |
