Overview
The ZF 4660.221.012 SUCTION TUBE is a critical hydraulic component engineered specifically for the WG200 and WG92 transmission series. This OEM genuine part ensures consistent oil flow from the transmission sump to the hydraulic pump, maintaining proper lubrication and cooling within the gearbox. As a precision-machined conduit, the 4660.221.012 suction tube prevents cavitation and pressure drops that can compromise shift quality. This part integrates directly with the TRANSMISSION HOUSING and works in concert with the PERIPHERALS assembly to ensure reliable oil delivery under all operating conditions.
Symptoms of Failure
- Hydraulic oil leaks at the transmission pan or pump interface: A cracked or warped suction tube often causes visible fluid seepage, especially during cold starts or after extended operation.
- Erratic gear engagement or delayed shifting: When the suction tube becomes blocked or develops internal cracks, oil starvation leads to inconsistent clutch pack pressure, causing hesitation or slipping between gears.
- Whining or cavitation noise from the transmission pump: A damaged suction tube allows air ingress, producing a distinct high-pitched whine that worsens under load or at low fluid levels.
- Overheating transmission due to insufficient lubrication: Restricted oil flow from a compromised suction tube reduces cooling capacity, triggering thermal warnings or burnt fluid odors.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4660.221.012 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Overall Length | 285 mm (estimated) |
| Inlet Diameter | 32 mm (estimated) |
| Weight | 0.45 kg (estimated) |
| OEM Reference | ZF 4660.221.012 |
| Seal Type | Integrated O-ring groove (compatible with O-RING) |
Compatibility
This suction tube is designed for ZF WG200 and WG92 series transmissions, commonly found in medium-duty trucks, buses, and off-highway equipment. It directly replaces the original factory part in WG180, WG200, and WG92 models. The 4660.221.012 interfaces with the RANGE SELECTOR valve body and the HOUSING assembly. For complete transmission rebuilds, verify compatibility with your specific serial number range. This part is not interchangeable with earlier WG150 or later WG210 variants without adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | PERIPHERALS | Hydraulic control assembly for shift modulation |
| 0501209818 | RANGE SELECTOR | Valve mechanism for gear range selection |
| 4660101011 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4660301018 | HOUSING | Secondary housing for clutch pack assembly |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precision mounting |
| 0769123894 | TYPE PLATE | Identification tag with serial number |
| 0634100317 | O-RING | Sealing element for fluid connections |
| 0636103273 | CAP SCREW | Fastener for housing attachment |
| 0750100022 | SCREW PLUG | Port closure for pressure testing |
| 4660101804 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
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