Overview
The ZF 4651.199.037 LOOSE PARTS kit is a critical service assembly designed exclusively for the WG 100 Series transmission. This genuine OEM part contains the specific fasteners, seals, and positioning components required to secure internal valve body and clutch pack assemblies within the main transmission housing. As a loose parts set, it ensures that all small hardware remains organized during rebuilds, preventing cross-threading or misalignment. The SKU 4651.199.037 is directly referenced in ZF service manuals for the WG100, and it interfaces precisely with the 4651101007: TRANSMISSION HOUSING to maintain structural integrity under high torque loads.
Symptoms of Failure
When the components within the ZF 4651.199.037 LOOSE PARTS kit degrade or are lost during maintenance, operators often report intermittent gear slippage under load due to loose valve body bolts. Another common failure symptom is low hydraulic pressure at the clutch packs, which manifests as delayed engagement when shifting from neutral to drive. Technicians also frequently encounter external oil seepage around the housing mating surfaces when the included seals are not replaced, leading to gradual fluid loss. Finally, abnormal metallic rattling from the transmission pan can indicate that a loose fastener from this kit has broken free, risking internal damage to the 4651301029: HOUSING.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4651.199.037 |
| OEM Reference | ZF WG100 Series |
| Material Composition | Steel (fasteners), NBR (seals) |
| Weight (estimated) | 0.45 kg (1.0 lb) |
| Thread Size (primary bolts) | M8 x 1.25 |
| Operating Temperature Range | -40°C to +120°C |
| Included Components | Bolts, washers, O-rings, positioning pins |
Compatibility
This LOOSE PARTS kit is engineered primarily for the ZF WG100 transmission model, which is commonly found in medium-duty commercial vehicles and industrial machinery. Based on the part type and fastener geometry, it is also compatible with the ZF WG180 and ZF WG200 series when used in conjunction with the correct 0634303928: O-RING for sealing. For applications involving the WG150 or WG250 variants, verify that the 4651301024: HOUSING bolt pattern matches the kit contents before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4651301029 | HOUSING | Secondary housing for valve body assembly |
| 0634303928 | O-RING | Seals fluid passages between housings |
| 4651301024 | HOUSING | Rear housing cover for clutch pack access |
| 4651203002 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4651303005 | SCREEN SHEET | Secondary filtration for valve body circuit |
| 0636101032 | CAP SCREW | Secures housing to transmission case |
| 0630361028 | SEALING CAP | Prevents contamination of hydraulic ports |
| 4475280060 | SCREW PLUG | Closes test ports for pressure checking |
| 0634303312 | O-RING | Seals screw plug against leakage |
