Overview
The ZF 4644.159.315 SHIFT SYSTEM is a critical mechanical assembly within the WG 200 Series powershift transmission. This OEM genuine component governs the precise engagement and disengagement of gear ratios, translating hydraulic pilot signals into positive mechanical movement. Positioned directly within the transmission valve body and housing interface, the shift system ensures that clutch packs are activated in the correct sequence under load. The SKU 4644.159.315 is manufactured to ZF’s original tolerances, guaranteeing consistent shift quality and preventing driveline shock. When replacing this unit, it is essential to inspect the adjoining TRANSMISSION HOUSING (4644101216) and the TRANSMISSION HOUSING (4644301223) for wear, as these components form the sealed environment for the shift mechanism.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn shift system causes noticeable lag when shifting from neutral to drive or reverse, often accompanied by a jarring clunk.
- Intermittent gear slipping under load: As internal detents and spools wear, the transmission may momentarily lose power delivery, particularly during uphill hauling or heavy towing.
- Erratic shift pattern or stuck gear: The transmission may fail to upshift or downshift at the correct RPM, or may become locked in a single gear, requiring a full stop to reset.
- External oil seepage at shift linkage: Worn seals within the shift system can allow ATF to weep past the actuator bore, leaving visible drips on the housing exterior.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4644.159.315 |
| Product Type | Shift System Assembly |
| Material | Hardened Steel / Aluminum Alloy |
| Weight (approx.) | 1.8 kg (4.0 lbs) |
| Overall Length | 210 mm |
| Mounting Bolt Pattern | 4-hole, M8 x 1.25 |
| OEM Reference | ZF 4644.159.315 |
| Operating Temperature Range | -20°C to +120°C |
Compatibility
This shift system is specifically engineered for the ZF WG 200 Series transmission family. Based on its design and OEM application data, the 4644.159.315 is directly compatible with the WG180, WG200, and WG210 models. It is also used in certain WG 200 variants found in mobile crane and heavy-duty forklift applications. For proper installation, verify that the TYPE PLATE (0730365067) on your transmission matches the WG200 series designation, and ensure the GROOVED STUD (0631311009) is torqued to factory specifications during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101216 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301223 | TRANSMISSION HOUSING | Secondary housing section for valve body |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment and retention fastener |
| 4644303060 | COVER PLATE | Seals shift system access port |
| 4644303061 | COVER PLATE | Alternate cover plate variant |
| 0634306525 | O-RING | Hydraulic seal for shift bore |
| 0636305026 | SCREW PLUG | Closes test port in housing |
| 4644301279 | SCREEN SHEET | Filters debris from shift oil flow |
| 4644301088 | SEALING CAP | Protects unused actuator ports |
ZF 4644.159.315 SHIFT SYSTEM – Shift System RFQ Support
ZF 4644.159.315 SHIFT SYSTEM can be reviewed as a shift-system sourcing item for WG, BP, HL, or ERGOPOWER-related service work when the application evidence is available.
Part-Number Summary
Use ZF number 4644.159.315 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: SHIFT SYSTEM
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4644.159.315 |
|---|---|
| Normalized SKU | 4644159315 |
| Part name | SHIFT SYSTEM |
| Product category | shift system |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
Image and Documentation Notes
Current product media status: fallback. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
Related Parts
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- ZF 4644.159.303 SHIFT SYSTEM
