Overview
The ZF 0501.216.208 RANGE SELECTOR is a critical pneumatic or electro-pneumatic control component that directs air pressure to the range-change cylinder within ZF’s WG series transmissions. Mounted directly on the TRANSMISSION HOUSING, this OEM genuine part governs the shift between high and low range (splitter) gears. The SKU 0501.216.208 ensures precise engagement of the planetary range section, making it indispensable for maintaining driveline torque delivery in heavy-duty commercial vehicles. Its robust construction withstands constant exposure to transmission oil mist and vibration.
Symptoms of Failure
- Delayed or harsh range shifts: A worn spool valve inside the 0501.216.208 causes sluggish engagement or abrupt clunking when moving between high and low range.
- Air leakage at the selector body: Cracks or degraded seals lead to audible hissing and a gradual loss of pneumatic pressure, often mistaken for a failing compressor.
- Inability to shift out of neutral range: The vehicle becomes stuck in a single range, typically low range, due to internal corrosion or debris blocking the selector’s internal passages.
- Intermittent gear disengagement under load: A failing range selector can cause the transmission to unexpectedly drop into neutral, especially on inclines, due to insufficient pilot pressure.
Technical Specifications
| Part Number | 0501.216.208 |
| OEM Reference | ZF 0501.216.208 |
| Material | Die-cast aluminum alloy with nitrile rubber seals |
| Weight | 0.85 kg (1.87 lbs) |
| Overall Dimensions | 120 mm x 80 mm x 65 mm |
| Operating Pressure | 6.2 – 8.5 bar (90 – 123 psi) |
| Port Thread Size | M12 x 1.5 (pneumatic ports) |
| Temperature Range | -40°C to +120°C |
Compatibility
This range selector is engineered for ZF’s modular WG series, specifically the WG100, WG160, and WG171 models. It also fits the WG94, WG210, and WG211 series when used with the correct HOUSING adapter. For WG180 and WG200 transmissions, verify that the mounting flange matches the HOUSING casting number. Always replace the O-RING (0634303928) during installation to prevent cross-threading and air leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101006 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4651301034 | HOUSING | Rear cover for range cylinder assembly |
| 0634303928 | O-RING | Seals selector to housing interface |
| 4651301013 | HOUSING | Front adapter for pneumatic valve block |
| 4651301015 | SCREEN SHEET | Filters debris from pilot air supply |
| 4651301035 | SCREEN SHEET | Secondary mesh filter for exhaust port |
| 0630361028 | SEALING CAP | Protects unused pneumatic ports |
| 4475280060 | SCREW PLUG | Closes oil gallery in selector body |
| 0634303312 | O-RING | Seals screw plug against oil pressure |
| 0630361063 | SEALING CAP | Dust cover for electrical connector |
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