Overview
The ZF 4651.199.025 LOOSE PARTS assembly is a critical service kit designed specifically for the WG 100 series transmission. This genuine OEM part consolidates essential wear components that maintain hydraulic circuit integrity and gear engagement precision within the transmission valve body and clutch pack assembly. The SKU 4651.199.025 serves as a direct replacement for deteriorated internal hardware, ensuring that the WG100 retains its factory-specified shift quality and torque capacity. When installed alongside a TRANSMISSION HOUSING (4651101007) and a O-RING (0634303928), this loose parts set restores the sealing and alignment necessary for reliable operation in heavy-duty industrial applications.
Symptoms of Failure
- Intermittent gear slippage under load: Worn internal components from the 4651.199.025 kit can cause the transmission to lose hydraulic pressure, resulting in erratic clutch engagement and power loss during acceleration.
- External oil seepage around the housing joint: Degraded seals and loose parts allow transmission fluid to escape, leaving visible drips or wet spots on the HOUSING (4651301029) and surrounding bell housing area.
- Delayed or harsh shifting: As the loose parts wear, valve body response times increase, producing a noticeable lag between gear changes or a jarring engagement that stresses the driveline.
- Metallic debris in the oil pan: Fragments from failing internal hardware contaminate the fluid, often requiring replacement of the HOUSING (4651301024) and a thorough system flush.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4651.199.025 |
| Material Composition | Hardened steel with nitrile rubber seals |
| Overall Dimensions | 120 mm x 85 mm x 45 mm (estimated) |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4651.199.025 |
| Operating Temperature Range | -40°C to +120°C |
| Torque Capacity | Up to 1,200 Nm (dependent on transmission model) |
Compatibility
This genuine ZF 4651.199.025 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 may be used in select WG180 and WG200 transmissions when the internal valve body and clutch pack configurations match the WG100 architecture. Always verify the existing part number against the transmission serial plate before ordering. For complete assembly, pair this kit with a SCREEN SHEET (4651203002) and a CAP SCREW (0636101032) to ensure proper filtration and fastening.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4651301029 | HOUSING | Secondary housing for valve body and hydraulic passages |
| 0634303928 | O-RING | Seals fluid pathways between housing sections |
| 4651301024 | HOUSING | Lower housing supporting oil pump and filter assembly |
| 4651203002 | SCREEN SHEET | Fine mesh filter for hydraulic fluid debris |
| 4651303005 | SCREEN SHEET | Secondary filter screen for high-pressure circuits |
| 0636101032 | CAP SCREW | Fastener for securing housing and valve body components |
| 0630361028 | SEALING CAP | Protective cap for unused hydraulic ports |
| 4475280060 | SCREW PLUG | Threaded plug for oil drain or test points |
| 0634303312 | O-RING | Seal for screw plug and cap screw interfaces |
