Overview
The ZF 4651.199.023 LOOSE PARTS assembly is a critical service kit designed specifically for the WG 100 Series transmission. This genuine OEM part, identified by SKU 4651.199.023, consolidates essential wear components that maintain hydraulic pressure integrity and gear engagement within the transmission valve body and clutch pack assembly. It sits directly within the main control circuit, acting as a sealing and filtration interface between the TRANSMISSION HOUSING and the HOUSING components. Without this kit, the transmission cannot sustain proper oil flow, leading to immediate performance degradation.
Symptoms of Failure
- Erratic gear engagement or slipping: When the 4651.199.023 LOOSE PARTS wear out, internal seals fail, causing clutch packs to slip under load. This is often noticed during uphill driving or heavy hauling.
- Hydraulic oil leaks around the valve body: Deteriorated O-rings within this kit allow transmission fluid to escape, leaving visible drips under the vehicle and reducing overall system pressure.
- Delayed shifting or harsh engagement: A worn kit disrupts the precise oil routing required for smooth gear changes, resulting in a noticeable lag when shifting from Park to Drive or between gears.
- Overheating transmission: Insufficient hydraulic pressure from failing components forces the transmission to work harder, generating excessive heat that can damage internal parts.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4651.199.023 |
| Material Composition | Steel, aluminum, and high-temperature NBR rubber |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 180 mm x 120 mm x 45 mm |
| OEM Reference | ZF 4651.199.023 |
| Operating Temperature Range | -40°C to +150°C |
| Seal Type | Hydraulic lip seal with integrated O-ring |
Compatibility
This genuine ZF 4651.199.023 LOOSE PARTS kit is engineered for the WG 100 Series transmission family. It is directly compatible with the WG100, WG120, and WG150 models. Additionally, it serves as a service component for the WG180 and WG200 transmissions when used in conjunction with the HOUSING adapter. For proper sealing during installation, always pair this kit with a new O-RING to prevent fluid bypass. The kit is not backward-compatible with older ZF 4HP or 5HP series units without significant modification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4651301029 | HOUSING | Intermediate housing for valve body mounting |
| 0634303928 | O-RING | Primary seal between housing and valve body |
| 4651301024 | HOUSING | Secondary housing for oil pump integration |
| 4651203002 | SCREEN SHEET | Fine mesh filter for hydraulic fluid debris |
| 4651303005 | SCREEN SHEET | Coarse mesh pre-filter for oil intake |
| 0636101032 | CAP SCREW | Fastener for securing housing components |
| 0630361028 | SEALING CAP | Protective cap for hydraulic ports |
| 4475280060 | SCREW PLUG | Threaded plug for drain or test ports |
| 0634303312 | O-RING | Secondary seal for plug and cap fittings |
