Overview
The ZF 4651.199.405 is a critical OEM genuine component engineered specifically for the WG 110 series transmission. This precision-machined part functions as a hydraulic control element, regulating fluid pressure and flow within the valve body assembly to ensure smooth gear engagement and consistent torque delivery. As an integral part of the transmission’s hydraulic circuit, the SKU 4651.199.405 works in concert with the TRANSMISSION HOUSING (4651101013) to maintain proper oil circulation and prevent pressure drops that can compromise shift quality. This genuine ZF part is manufactured to exacting tolerances, ensuring a perfect seal and reliable operation under heavy-duty industrial loads.
Symptoms of Failure
- Delayed or harsh shifting — When the 4651.199.405 wears, hydraulic pressure fluctuations cause noticeable lag between gear changes or abrupt engagement, often accompanied by a “clunking” sensation during acceleration.
- Transmission fluid leaks around the valve body — Deterioration of sealing surfaces leads to external oil seepage, typically visible as drips near the bell housing or pan gasket area, requiring immediate inspection of the O-RING (0634303928) and adjacent housing components.
- Erratic gear engagement under load — Worn internal bores cause intermittent pressure loss, resulting in the transmission slipping out of gear or failing to hold torque when climbing grades or hauling heavy payloads.
- Increased operating temperature — Restricted fluid flow through a degraded 4651.199.405 forces the transmission to work harder, generating excess heat that can trigger warning lights or cause burnt fluid odor.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4651.199.405 |
| Material | High-strength aluminum alloy with hardened steel inserts |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 145 mm x 68 mm x 42 mm |
| OEM Reference | ZF 4651.199.405 (Genuine) |
| Sealing Type | Integrated O-ring groove (compatible with 0634303928) |
| Operating Pressure | 12–18 bar (174–261 psi) |
Compatibility
This OEM genuine part is primarily designed for the ZF WG 110 series transmission, commonly found in medium-duty trucks, buses, and construction equipment. Based on its hydraulic control function, the 4651.199.405 is also compatible with the following ZF transmission models: WG 120, WG 150, WG 180, WG 200, and select variants of the Ecomat 4HP series. For proper installation, ensure the HOUSING (4651301032) and HOUSING (4651301033) are free from cracks or warping, as these directly affect the sealing integrity of the 4651.199.405.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101013 | TRANSMISSION HOUSING | Main structural casing for gear and valve body assembly |
| 4651301032 | HOUSING | Secondary housing for hydraulic control module |
| 0634303928 | O-RING | Seals fluid passages between housing and valve body |
| 4651301033 | HOUSING | Lower housing cover for oil sump access |
| 4651203002 | SCREEN SHEET | Fine mesh filter for hydraulic fluid debris removal |
| 4651303005 | SCREEN SHEET | Secondary filter screen for oil return line |
| 0636101032 | CAP SCREW | Fastener for securing housing components |
| 0630361028 | SEALING CAP | Protects threaded ports from contamination |
| 4475280060 | SCREW PLUG | Closes unused hydraulic ports |
| 0634303312 | O-RING | Seals screw plug and cap screw interfaces |
Frequently Asked Questions
Q: Can the ZF 4651.199.405 be replaced without removing the transmission from the vehicle?
A: Yes, in most applications this part is accessible after draining the fluid and removing the transmission pan. However, you must also inspect the O-RING (0634303928) and adjacent housings for wear during the procedure.
Q: How often should the 4651.199.405 be inspected or replaced?
A: ZF recommends inspecting this hydraulic control element every 100,000 miles or during major transmission overhauls. If you notice any of the failure symptoms listed above, immediate replacement is advised to prevent damage to the TRANSMISSION HOUSING (4651101013).
Q: Is the 4651.199.405 interchangeable with aftermarket alternatives?
A: For optimal performance and warranty compliance, we strongly recommend using only OEM genuine ZF parts. Aftermarket variants often lack the precise dimensional tolerances required for proper sealing with the HOUSING (4651301032) and HOUSING (4651301033).
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
