Overview
The ZF 4651.306.140 GASKET is a precision-engineered sealing component designed specifically for the WG 100 and WG 110 transmission series. This OEM genuine part sits at the critical interface between the TRANSMISSION HOUSING and the main valve body assembly, ensuring a leak-proof seal under high hydraulic pressure. The SKU 4651.306.140 is manufactured to ZF’s exacting tolerances, preventing fluid migration between internal galleries and maintaining consistent clutch application pressure. Without this gasket, the transmission cannot maintain the necessary hydraulic integrity for proper gear engagement.
Symptoms of Failure
- External oil seepage at housing joint: When the 4651.306.140 gasket deteriorates, you will notice fluid weeping from the seam between the HOUSING and the valve body, often mistaken for a loose bolt issue.
- Delayed or harsh shifting: A compromised gasket allows cross-leakage between hydraulic circuits, causing erratic shift timing and harsh engagements during acceleration.
- Low transmission fluid level without visible drips: Internal leakage through a failed gasket can cause fluid to bypass into the torque converter cavity, leading to unexplained fluid loss and eventual gear slipping.
- Overheating due to pressure loss: Insufficient sealing reduces line pressure, causing the transmission to run hotter than normal as clutches slip under load.
Technical Specifications
| Part Number | 4651.306.140 |
| Material | Nitrile rubber (NBR) with fiber reinforcement |
| Thickness | 1.5 mm (0.059 in) |
| Outer Diameter | 185 mm (7.28 in) |
| Inner Diameter | 145 mm (5.71 in) |
| Weight | 0.045 kg (0.099 lbs) |
| OEM Reference | ZF 4651.306.140 |
| Temperature Range | -40°C to +150°C |
Compatibility
This gasket is primarily designed for the ZF WG 100 and WG 110 transmission series, which are widely used in medium-duty commercial vehicles and industrial machinery. Based on the sealing geometry, the 4651.306.140 also fits the WG 180 and WG 200 models when used with the appropriate O-RING and HOUSING configurations. Always verify compatibility by cross-referencing the housing part numbers before installation. This gasket is not interchangeable with the WG 150 series due to different bolt patterns.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4651301029 | HOUSING | Valve body mounting housing |
| 0634303928 | O-RING | Static seal for hydraulic ports |
| 4651301024 | HOUSING | Intermediate housing section |
| 4651203002 | SCREEN SHEET | Fine mesh filter for oil pickup |
| 4651303005 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636101032 | CAP SCREW | Fastener for housing assembly |
| 0630361028 | SEALING CAP | Closes unused hydraulic ports |
| 4475280060 | SCREW PLUG | Threaded plug for drain holes |
| 0634303312 | O-RING | Seal for screw plug applications |
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