Overview
The ZF 4651.199.030 LOOSE PARTS kit is a critical service assembly designed for the WG 100 Series transmission family. This genuine OEM part consolidates essential wear components that manage hydraulic sealing and internal pressure regulation within the valve body and clutch pack circuits. Specifically, the SKU 4651.199.030 includes precision-machined spacers, retaining rings, and small bore components that ensure correct end-play tolerances during a rebuild or overhaul. Without this loose parts set, the transmission housing cannot maintain proper fluid routing, leading to inefficient power transfer. It is frequently ordered alongside the 4651101007: TRANSMISSION HOUSING to guarantee a complete internal seal.
Symptoms of Failure
- Delayed or erratic gear engagement: When the 4651.199.030 components wear, internal clearance shifts, causing a noticeable lag when shifting from Neutral to Drive or Reverse.
- Low hydraulic pressure at the test port: A worn loose parts set allows internal leakage, resulting in pressure drops that trigger fault codes for clutch slip.
- Intermittent oil leaks near the valve body interface: Degraded O-rings and spacers within this kit permit transmission fluid to weep past the 4651301029: HOUSING mating surface.
- Harsh or flared shifts under load: As the parts lose dimensional integrity, the transmission may slam into gear or momentarily lose torque during acceleration.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4651.199.030 |
| Material Composition | Steel alloy with nitrile rubber seals |
| Weight (estimated) | 0.45 kg (1.0 lb) |
| Kit Contents | Spacers, retaining rings, sealing elements |
| OEM Reference | ZF WG 100 Series |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF 4651.199.030 loose parts kit is engineered specifically for the WG 100 Series transmission family. Based on its internal geometry and sealing profile, it is also compatible with the WG 120, WG 150, and WG 180 models that share the same valve body architecture. It is not suitable for WG 200 or WG 250 units without verifying the housing bore dimensions. For a full rebuild, always inspect the 4651301024: HOUSING for scoring, and replace the 0634303928: O-RING simultaneously to prevent cross-contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4651301029 | HOUSING | Intermediate support for clutch assembly |
| 0634303928 | O-RING | Static seal for hydraulic circuits |
| 4651301024 | HOUSING | Rear housing for output shaft support |
| 4651203002 | SCREEN SHEET | Fine mesh filter for oil sump |
| 4651303005 | SCREEN SHEET | Secondary filter for valve body feed |
| 0636101032 | CAP SCREW | Fastener for housing attachment |
| 0630361028 | SEALING CAP | Port plug for pressure test points |
| 4475280060 | SCREW PLUG | Threaded drain or fill plug |
| 0634303312 | O-RING | Seal for screw plug interface |
