Overview
The ZF 4642.199.798 LOOSE PARTS kit is a critical service assembly designed specifically for the WG 201 Series transmission. This genuine OEM component set includes all necessary fasteners, seals, and small hardware required to secure internal assemblies during a rebuild or overhaul. The SKU 4642.199.798 directly interfaces with the main casing and valve body, ensuring that all loose components remain properly torqued and aligned under high-load conditions. Without this kit, even a minor vibration can lead to misalignment of the 4644101160: TRANSMISSION HOUSING or the 4644301323: TRANSMISSION HOUSING, compromising hydraulic pressure integrity.
Symptoms of Failure
- Intermittent gear slippage under load — When the loose parts kit degrades, fasteners loosen, causing the clutch packs to lose clamping force, resulting in erratic shifting during uphill climbs or towing.
- External oil seepage from housing joints — Worn seals within the 4642.199.798 assembly allow transmission fluid to weep past the 4644301189: THREADED BUSH, leaving visible drips on the bell housing.
- Audible rattling from the transmission pan area — Loose hardware inside the kit creates a metallic chatter, particularly at idle, indicating that the 4475280043: SCREW PLUG has backed out from its bore.
- Delayed engagement when shifting from Park to Drive — A failing loose parts kit reduces the preload on the valve body, causing a 2-3 second lag before the transmission engages.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4642.199.798 |
| Kit Contents | Fasteners, seals, retaining rings, bushings |
| Material | Steel (zinc-plated) + NBR rubber seals |
| Weight | 0.45 kg (1.0 lb) |
| Thread Pitch (primary bolts) | M8 x 1.25 |
| Torque Specification | 25 Nm ± 2 Nm |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF WG 201 Series |
Compatibility
This genuine ZF 4642.199.798 loose parts kit is engineered for the WG 201 transmission family, but its hardware dimensions also cross-reference to the WG180 and WG200 series due to shared casing designs. It is directly compatible with models: WG180, WG200, WG201, and WG210. Always verify the housing variant—the 4644101160: TRANSMISSION HOUSING and 4644301323: TRANSMISSION HOUSING require this kit for proper sealing. The kit is not backward-compatible with pre-1990 WG150 units without adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main casing for gear train |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant |
| 4644301189 | THREADED BUSH | Seals hydraulic passages |
| 4475280043 | SCREW PLUG | Closes oil drain ports |
| 0634306198 | O-RING | Prevents fluid leaks |
| 0730365067 | TYPE PLATE | Identification tag |
| 4644301161 | COVER PLATE | Protects valve body |
| 0636100621 | HEXAGON SCREW | Secures housing halves |
| 0631610020 | SET SCREW | Adjusts clutch clearance |
| 0501218540 | BREATHER | Vents internal pressure |
