Overview
The ZF 4646.199.063 LOOSE PARTS kit is a critical service component designed specifically for the WG 250 Series transmission. This genuine OEM assembly contains the necessary fasteners, seals, and small hardware required to secure and seal the transmission housing during a rebuild or overhaul. The SKU 4646.199.063 sits at the interface between the main casing and the valve body, ensuring that all internal hydraulic circuits remain pressurized and free from contamination. Without this specific loose parts set, the structural integrity of the WG250 gearbox is compromised, leading to potential fluid migration and pressure loss.
Symptoms of Failure
When the ZF 4646.199.063 LOOSE PARTS begin to degrade or are improperly torqued, operators will notice distinct operational issues. Oil weeping from the transmission housing seam is the most common early indicator, often mistaken for a gasket failure. Erratic gear engagement under load occurs as hydraulic pressure bleeds past worn fasteners. Increased transmission noise during deceleration signals that the internal components are no longer held in precise alignment. Finally, visible metal particles in the oil filter can result from vibration-induced fretting of the housing interface.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4646.199.063 |
| OEM Reference | ZF 4646.199.063 |
| Material Composition | Steel alloy with zinc-nickel plating |
| Weight (estimated) | 0.45 kg (1.0 lb) |
| Thread Size | M8 x 1.25 (primary fasteners) |
| Torque Specification | 25 Nm ± 2 Nm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF 4646.199.063 LOOSE PARTS kit is engineered for the WG 250 Series transmission family. It is also compatible with the WG180 and WG200 models when used in conjunction with the correct TRANSMISSION HOUSING (4646101028). For full assembly integrity, always pair this kit with the HOUSING (4646301095) and the COVER (4646301087). The included HEXAGON SCREW (0636015304) ensures proper clamping force across the mating surfaces.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Main casing for gear train |
| 4646301095 | HOUSING | Secondary housing for valve body |
| 4646301087 | COVER | Seals the housing assembly |
| 0636015304 | HEXAGON SCREW | Primary fastening bolt |
| 0636101828 | CAP SCREW | Secures cover plate |
| 4646301102 | COVER SHEET | Protective shield for internals |
| 4646301098 | COVER SHEET | Secondary protective layer |
| 0730365125 | TYPE PLATE | Identification and rating label |
| 0631311009 | GROOVED STUD | Alignment dowel for housing |
| 0636101193 | CAP SCREW | Fastener for valve body |
