Overview
The ZF 4651.199.072 LOOSE PARTS kit is a critical service assembly designed specifically for the WG 100 series of automatic transmissions. This genuine OEM part consolidates essential fasteners, seals, and small hardware components required during a rebuild or major repair of the transmission housing and valve body area. The SKU 4651.199.072 ensures that all loose elements—such as retaining clips, bolts, and positioning pins—are replaced simultaneously, preventing contamination and ensuring proper clamping force. This kit sits within the main casing assembly, interfacing directly with the TRANSMISSION HOUSING and the HOUSING to secure internal components against vibration and thermal expansion.
Symptoms of Failure
When the loose parts in this kit degrade or are lost during service, operators typically notice three distinct failure modes. First, intermittent gear slippage under load occurs as retaining clips lose tension, allowing clutch packs to shift out of alignment. Second, external oil seepage around the housing seam becomes apparent when the included O-RING hardens or the bolts loosen, leading to low fluid levels and overheating. Third, abnormal metallic rattling from the bell housing signals that loose hardware has broken free, potentially damaging the TRANSMISSION HOUSING. Finally, difficulty engaging reverse gear often points to missing positioning pins from this kit, causing valve body misalignment.
Technical Specifications
| Part Number | 4651.199.072 |
| Material Composition | Steel (fasteners), Nitrile rubber (seals), Zinc-plated carbon steel (clips) |
| Kit Contents | 6x bolts, 4x O-rings, 2x retaining clips, 1x positioning pin, 1x washer set |
| Weight | 0.34 kg (0.75 lbs) |
| OEM Reference | ZF Friedrichshafen AG – WG 100 Series |
| Operating Temperature Range | -40°C to +120°C (-40°F to +248°F) |
| Thread Pitch (Primary Bolts) | M8 x 1.25 |
Compatibility
This loose parts kit is engineered for the ZF WG 100 series transmission family. It is directly compatible with the WG100, WG120, and WG150 models. Based on the fastener geometry and seal dimensions, it also fits select WG180 and WG200 variants when used in conjunction with the correct HOUSING assembly. Always verify the housing casting number before installation; the kit is not intended for the older WG 80 series or the heavy-duty WG 300 series. For mixed-model fleets, cross-reference the included O-RING diameter against your existing housing bore.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101014 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4651301029 | HOUSING | Intermediate housing for valve body support |
| 0634303928 | O-RING | Seals housing joint against fluid leaks |
| 4651301036 | TRANSMISSION HOUSING | Rear housing section for output shaft |
| 4651203002 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4651303005 | SCREEN SHEET | Coarse debris screen for sump area |
| 0636101032 | CAP SCREW | High-tensile bolt for housing fastening |
| 0630361028 | SEALING CAP | Plugs unused ports in the housing |
| 4475280060 | SCREW PLUG | Threaded plug for drain/fill holes |
| 0634303312 | O-RING | Secondary seal for cap screw applications |
