Overview
The ZF 4651.199.078 LOOSE PARTS kit is a critical service component designed specifically for the WG 100 series transmission. This genuine OEM assembly includes all necessary fasteners, spacers, and small hardware elements required to secure and align internal transmission assemblies during a rebuild or major repair. The SKU 4651.199.078 sits within the valve body and clutch pack region, ensuring that loose components such as pistons, springs, and separator plates remain correctly positioned under high hydraulic pressure. Without this kit, the transmission cannot maintain proper gear engagement or fluid routing. It is often replaced in conjunction with the 4651101015: TRANSMISSION HOUSING and the 4651301039: HOUSING to guarantee a complete sealing surface.
Symptoms of Failure
- Erratic gear engagement or delayed shifting: When the 4651.199.078 loose parts wear or become misaligned, the valve body cannot properly direct hydraulic flow, causing harsh or delayed shifts.
- Internal oil leaks around the housing interface: Worn fasteners or spacers allow fluid to bypass seals, leading to low transmission fluid levels and overheating.
- Clutch pack slippage under load: If the loose parts fail to secure the clutch piston return springs, the clutches may not fully engage, resulting in power loss during acceleration.
- Unusual metallic rattling from the transmission pan: Broken or loose hardware can fall into the sump, creating noise and potentially damaging the 0634303928: O-RING and adjacent seals.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4651.199.078 |
| Material | Steel (fasteners) / Nylon (spacers) |
| Weight | 0.45 kg (1.0 lb) |
| Dimensions (L x W x H) | 120 mm x 80 mm x 30 mm |
| OEM Reference | ZF 4651.199.078 |
| Operating Temperature Range | -40°C to +120°C |
| Compatible Housing | 4651301013: HOUSING |
Compatibility
This genuine ZF 4651.199.078 LOOSE PARTS kit is engineered for the WG 100 series transmission family. It is directly compatible with models including the WG100, WG120, WG150, WG180, and WG200. The kit is also used in certain WG 300 series variants where the valve body architecture is shared. Always verify that the 4651301013: HOUSING and the 4651101015: TRANSMISSION HOUSING match your specific transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101015 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4651301039 | HOUSING | Intermediate housing for clutch pack |
| 0634303928 | O-RING | Seals fluid passages between housings |
| 4651301013 | HOUSING | Rear housing for output shaft support |
| 4651301015 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4651301035 | SCREEN SHEET | Secondary filtration for valve body |
| 0630361028 | SEALING CAP | Closes unused ports in housing |
| 4475280060 | SCREW PLUG | Threaded plug for drain/fill holes |
| 0634303312 | O-RING | Seals screw plug to housing |
| 0630361063 | SEALING CAP | High-pressure port cap |
