Overview
The ZF 4616.168.003 SPLITTER BOX is a critical pneumatic-hydraulic control unit engineered for the WG 65 series of heavy-duty transmissions. This OEM genuine part governs the splitter gear shift sequence, allowing the transmission to operate across a wider ratio spread without increasing the number of main gears. Positioned on the rear housing section, the splitter box interfaces directly with the 4616105413: OUTPUT shaft assembly and the 4616203017: OUTPUT FLANGE to modulate torque delivery. The SKU 4616.168.003 is a direct replacement unit, factory-sealed to ZF tolerances, ensuring precise engagement timing for the WG65’s range-change mechanism.
Symptoms of Failure
- Delayed or harsh splitter engagement: When the 4616.168.003 wears internally, the shift between high and low split becomes sluggish or clunks audibly, especially under load. This is a common long-tail search query for “ZF WG65 splitter box shifting hard.”
- Air or oil leakage at the housing seam: Deteriorated seals within the splitter box cause fluid seepage around the 4616101117: TRANSMISSION HOUSING interface. Operators searching for “ZF splitter box oil leak repair” often trace the source to this unit.
- Intermittent loss of splitter range: The transmission may fail to engage the splitter gear entirely, leaving the vehicle stuck in direct drive. This symptom frequently appears alongside loose 0636011038: HEXAGON SCREW fasteners that secure the box to the main case.
- Increased air consumption in pneumatic lines: A failing internal spool valve causes constant air bleed, which can be detected as a hissing sound from the transmission. This is a distinct failure mode for the 4616.168.003 unit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4616.168.003 |
| OEM Reference | ZF 4616.168.003 |
| Material | Die-cast aluminum alloy with hardened steel spool |
| Weight | 2.8 kg (6.2 lbs) |
| Overall Dimensions | 210 mm x 140 mm x 95 mm |
| Operating Pressure | 8–10 bar (pneumatic) |
| Seal Type | Nitrile O-rings (multiple) |
| Mounting Bolt Torque | 45 Nm (33 ft-lbs) |
Compatibility
This splitter box is specifically designed for the ZF WG 65 series, which includes models such as the WG65, WG80, WG120, WG150, WG180, and WG200. It is a direct fit for all WG65 variants used in municipal trucks, refuse vehicles, and medium-duty construction equipment. The 4616.168.003 interfaces with the output section of the transmission and requires proper alignment with the 4616105413: OUTPUT shaft. For installations involving a power take-off (PTO), verify that the 4616203017: OUTPUT FLANGE is torqued to specification before mounting the splitter box. Always replace the 4616101117: TRANSMISSION HOUSING gasket and 0636011038: HEXAGON SCREW fasteners during installation to prevent cross-threading.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers torque from splitter box to driveline |
| 4616203017 | OUTPUT FLANGE | Connects output shaft to driveshaft yoke |
| 4616101117 | TRANSMISSION HOUSING | Main structural case enclosing gear sets |
| 0636011038 | HEXAGON SCREW | Secures splitter box to housing |
| 0636016015 | HEXAGON SCREW | Fastener for output flange retention |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for splitter box positioning |
| 0634313118 | O-RING | Seals pneumatic port on splitter box |
| 0732611049 | FILTER INSERT | Traps debris in pneumatic supply line |
| 0634303718 | O-RING | Seals splitter box to housing interface |
| 0636610082 | STUD | Threaded rod for mounting flange attachment |
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