Overview
The ZF 4642.199.489 LOOSE PARTS for WG201 represents a critical service kit designed to restore the internal sealing and alignment integrity of your ZF WG-series transmission. This OEM genuine part, identified by SKU 4642.199.489, contains the specific loose hardware and small components that secure the valve body and hydraulic control assemblies within the transmission housing. Without these precision-engineered parts, the entire hydraulic circuit cannot maintain proper pressure, leading to erratic shift behavior. When rebuilding a WG201 unit, this kit is often paired with a replacement 4644101160: TRANSMISSION HOUSING to ensure all mounting points are structurally sound.
Symptoms of Failure
- Intermittent gear slippage under load: When these loose parts fatigue, the valve body loses its clamping force, causing hydraulic pressure to bleed off during acceleration.
- External oil seepage at housing seams: Worn or missing components from this kit allow transmission fluid to escape past the 4644301323: TRANSMISSION HOUSING interface, leaving visible drips on the bell housing.
- Delayed engagement when shifting from Neutral to Drive: A loose fit in the control assembly prevents the spool valves from seating correctly, creating a noticeable lag of 2-3 seconds.
- Unusual rattling noise from the transmission pan area: Dislodged hardware from this kit can vibrate against the 4644301189: THREADED BUSH, producing a metallic chatter at idle.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4642.199.489 |
| Kit Contents | Loose hardware, retaining clips, dowel pins, sealing washers |
| Material Composition | Case-hardened steel (fasteners), Nitrile rubber (seals) |
| Weight | 0.45 kg (1.0 lb) |
| Dimensions (packaged) | 150 mm x 100 mm x 40 mm |
| OEM Reference | ZF Friedrichshafen AG |
| Thread Pitch (primary bolt) | M8 x 1.25 |
Compatibility
This genuine ZF 4642.199.489 LOOSE PARTS kit is engineered specifically for the WG 201 Series transmissions. Based on its design and fastener geometry, it is also compatible with the WG180, WG200, and WG210 models that share the same valve body footprint. The kit directly interfaces with the 4475280043: SCREW PLUG ports and the main housing bores. Always verify your transmission serial number against the WG201 parts catalog before installation, as minor revisions exist between early and late production units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant for WG201 |
| 4644301189 | THREADED BUSH | Wear-resistant insert for bolt holes |
| 4475280043 | SCREW PLUG | Seals hydraulic test ports |
| 0634306198 | O-RING | Static seal for housing joints |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 4644301161 | COVER PLATE | Protects valve body access opening |
| 0636100621 | HEXAGON SCREW | Fastener for cover plate retention |
| 0631610020 | SET SCREW | Adjustable stop for shift linkage |
| 0501218540 | BREATHER | Pressure equalization vent |
