Overview
The ZF 4656.199.404 LOOSE PARTS kit is a critical service assembly designed specifically for the WG 210 series transmission. This OEM genuine part contains the essential fasteners, seals, and positioning components required to secure internal assemblies within the transmission housing. As a loose parts set, it ensures that all hardware meets ZF’s exacting tolerances for vibration resistance and oil containment. The SKU 4656.199.404 is typically installed during a full overhaul or when replacing major structural components such as the TRANSMISSION HOUSING or the HOUS.FRONT SECT. Without this kit, reassembly risks using mismatched hardware that can lead to premature wear or fluid migration.
Symptoms of Failure
- Oil weeping from housing joints: When the loose parts (including bolts and sealing pins) degrade, the clamping force on the HOUSING REAR PART diminishes, allowing transmission fluid to seep past gaskets.
- Gear engagement hesitation or slipping: Worn or missing CYLINDRICAL PIN components can allow valve body or clutch pack alignment to shift, causing delayed shifts under load.
- Abnormal driveline noise during acceleration: Loose fasteners from a failing 4656.199.404 set permit internal components to vibrate, producing a distinct rattle or hum that intensifies with RPM.
- Torque converter lockup failure: Degraded locating hardware can prevent proper seating of the converter hub, leading to erratic lockup and increased heat generation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4656.199.404 |
| OEM Reference | ZF 4656.199.404 |
| Material Composition | Steel (grade 10.9) with zinc-nickel plating |
| Weight (approx.) | 0.85 kg (1.87 lbs) |
| Kit Contents | Bolts, pins, washers, and locating dowels |
| Thread Pitch (primary) | M10 x 1.5 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This loose parts kit is engineered for the ZF WG 210 series, but it also shares hardware specifications with the WG 180 and WG 200 transmission families. It is directly compatible with any WG210 variant (including WG210C and WG210E) that uses the standard bolt pattern for the TRANSMISSION HOUSING. For older WG 160 models, verify the thread pitch against the CAP SCREW dimensions before ordering. The kit is not backward-compatible with pre-2000 ZF 4HP series units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101041 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201028 | HOUS.FRONT SECT | Front section of the transmission housing |
| 4657201013 | HOUSING REAR PART | Rear housing section for output shaft support |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for valve body positioning |
| 0636100801 | CAP SCREW | M10 bolt for housing flange clamping |
| 4656301148 | FIXING PLATE | Retention plate for oil pump assembly |
| 4657301034 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4657301035 | SCREEN SHEET | Coarse mesh pre-filter for sump pickup |
| 0636100803 | CAP SCREW | M8 bolt for valve body attachment |
| 0631311009 | GROOVED STUD | Threaded stud for oil cooler mounting |
