Overview
The ZF 4651.309.002 is a precision-engineered OEM genuine component designed for the WG 100, WG 110, and WG 150 series transmissions. This part functions as a critical interface within the hydraulic control system, regulating fluid flow to ensure consistent clutch engagement and smooth power delivery. The SKU 4651.309.002 is manufactured to exacting ZF tolerances, making it a direct replacement for worn units in heavy-duty industrial drivetrains. When installed alongside a robust TRANSMISSION HOUSING (4642101109), this component helps maintain structural integrity under high torque loads.
Symptoms of Failure
- Erratic gear engagement and slipping: A worn 4651.309.002 often causes delayed or harsh shifting, particularly when the transmission is under load. This is a common symptom of internal hydraulic pressure loss.
- External oil seepage around the valve body area: Degraded seals on this part lead to visible fluid leaks, which can contaminate the TRANSMISSION HOUSING (4642301205) and reduce overall lubrication efficiency.
- Overheating during prolonged operation: When the 4651.309.002 fails to regulate flow correctly, excess friction generates heat, potentially warping adjacent components like the TYPE PLATE (0730365125).
- Unusual whining or grinding noises: Metal fatigue or debris contamination within this part creates audible distress signals, often requiring immediate replacement to avoid damage to the GROOVED STUD (0631311009).
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4651.309.002 |
| Material | High-grade aluminum alloy with hardened steel inserts |
| Weight | 1.2 kg (2.65 lbs) |
| Dimensions (L x W x H) | 185 mm x 95 mm x 45 mm |
| Operating Pressure Range | 8–15 bar (116–218 psi) |
| Seal Type | Nitrile rubber (NBR) O-rings |
Compatibility
This OEM genuine part is specifically engineered for ZF WG 100, WG 110, and WG 150 series transmissions. It is also compatible with the WG 180 and WG 200 models when used in conjunction with the correct COVER PLATE (4642306050). The 4651.309.002 is not backward-compatible with older WG 80 series units without a full valve body retrofit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses and supports internal gear sets |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for WG 150 series |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Secures housing alignment during assembly |
| 4642301168 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4642301169 | SCREEN SHEET | Fine-mesh filter for high-flow circuits |
| 0636100621 | HEXAGON SCREW | Fastener for valve body mounting |
| 4642301186 | SCREEN SHEET | Coarse pre-filter for sump protection |
| 4644106085 | SHIFT SYSTEM | Controls gear selection via hydraulic spools |
| 4642306050 | COVER PLATE | Seals the valve body access port |
Frequently Asked Questions
Q: Can the 4651.309.002 be repaired, or must it be replaced?
A: This is a non-serviceable sealed unit. ZF recommends full replacement when failure symptoms appear, as internal wear cannot be reliably corrected with seals or shims.
Q: How does this part interact with the shift system?
A: The 4651.309.002 receives pilot pressure from the SHIFT SYSTEM (4644106085) and modulates flow to the clutch packs. A failing unit will cause the shift system to hunt or slam between gears.
Q: Is the 4651.309.002 interchangeable between WG 100 and WG 150 transmissions?
A: Yes, the physical dimensions are identical across these series. However, always verify the TYPE PLATE (0730365125) to confirm the exact model variant before installation.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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