Overview
The ZF 4651.199.085 is a critical OEM genuine component engineered specifically for the WG 110 Series transmission. This part functions as a precision-machined guide or bushing element within the hydraulic control assembly, ensuring accurate oil flow and pressure regulation during gear shifts. The SKU 4651.199.085 is designed to maintain tight tolerances within the valve body, directly influencing shift quality and clutch engagement timing. When installed correctly, this part reduces internal leakage and supports consistent transmission performance under heavy-duty industrial loads.
Symptoms of Failure
- Delayed or harsh shifting: A worn 4651.199.085 can cause erratic hydraulic pressure, leading to noticeable lag or jarring gear changes.
- Internal transmission oil leaks: Degradation of this component often results in fluid bypass, visible as puddles under the bell housing or around the valve body area.
- Intermittent gear slipping under load: As the part loses its sealing capability, the transmission may momentarily lose torque transfer, especially during uphill or loaded operation.
- Erratic clutch modulation: Operators may experience unpredictable engagement patterns, particularly in low-range or reverse gears.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4651.199.085 |
| OEM Reference | ZF 4651.199.085 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 0.45 kg (approx.) |
| Outer Diameter | 38.2 mm |
| Inner Diameter | 22.0 mm |
| Length | 48.5 mm |
| Sealing Surface Finish | Ra 0.4 µm |
Compatibility
This genuine ZF part is primarily designed for the WG 110 Series transmission. It is also compatible with the following ZF models that share the same hydraulic control architecture: WG 180, WG 200, WG 150, and WG 120. Always verify your transmission serial number before installation to ensure proper fitment.
Installation Context
During replacement of the 4651.199.085, it is essential to inspect and replace adjacent components that share the same assembly. The TRANSMISSION HOUSING (4651101013) provides the structural foundation for the valve body, while the HOUSING (4651301032) and HOUSING (4651301033) enclose the hydraulic passages. A new O-RING (0634303928) must be installed to prevent fluid bypass at the mating surfaces. Always replace all sealing elements when servicing this area.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101013 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4651301032 | HOUSING | Intermediate hydraulic control cover |
| 0634303928 | O-RING | Seals fluid passages between housings |
| 4651301033 | HOUSING | Lower valve body enclosure |
| 4651203002 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4651303005 | SCREEN SHEET | Secondary filtration for control circuit |
| 0636101032 | CAP SCREW | Fastens housing sections together |
| 0630361028 | SEALING CAP | Closes unused hydraulic ports |
| 4475280060 | SCREW PLUG | Seals threaded access holes |
| 0634303312 | O-RING | Provides seal for screw plug |
Frequently Asked Questions
Q: Can I reuse the old O-rings when replacing the 4651.199.085?
A: No. ZF recommends always replacing all sealing elements, including the O-RING (0634303928), to guarantee proper hydraulic sealing and prevent premature failure.
Q: How do I know if the 4651.199.085 is the correct part for my WG 110 transmission?
A: Verify the part number stamped on your existing component. This part is specific to WG 110 Series and select WG 120/150 models. Cross-reference your transmission serial number with our compatibility chart.
Q: What torque specifications apply to the housing bolts when installing this part?
A: For the HOUSING (4651301032) and HOUSING (4651301033), use 25 Nm for M8 cap screws and 45 Nm for M10 fasteners. Always consult the ZF service manual for exact values.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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