Overview
The ZF 4644.159.350 SHIFT SYSTEM is a precision-engineered mechanical assembly designed specifically for the WG 100 series of heavy-duty automatic transmissions. This OEM genuine component governs the hydraulic and mechanical selection of gear ratios, translating driver commands into smooth, reliable shifts. Located within the valve body area of the transmission, the shift system interfaces directly with the TRANSMISSION HOUSING to ensure correct oil flow and engagement timing. As a critical control element, the SKU 4644.159.350 must maintain exact tolerances to prevent erratic shifting and driveline damage in commercial vehicles.
Symptoms of Failure
- Delayed or harsh gear engagement: When the shift system wears, hydraulic pressure modulation fails, causing noticeable clunking or hesitation when moving from Neutral to Drive or Reverse.
- Intermittent gear slipping under load: A worn 4644.159.350 assembly can cause the transmission to momentarily lose power delivery, especially during uphill climbs or heavy hauling.
- Oil contamination from internal debris: Degraded shift system components shed metallic particles into the fluid, often detected during routine filter inspections or by analyzing oil samples.
- No shift or stuck in gear: Complete failure of the shift mechanism leaves the transmission locked in one ratio, requiring immediate replacement to restore vehicle mobility.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4644.159.350 |
| OEM Reference | ZF 4644.159.350 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 1.85 kg (4.08 lbs) |
| Overall Length | 210 mm |
| Width | 95 mm |
| Height | 65 mm |
| Operating Temperature Range | -40°C to +120°C |
| Sealing Interface | Compatible with O-RING 0634303928 |
Compatibility
This shift system is engineered for the ZF WG 100 series transmission family, including models WG100, WG120, WG150, WG180, and WG200. It is also backward-compatible with certain Ecomat 4HP and 5HP variants that share the same valve body architecture. For proper installation, the 4644.159.350 must be paired with a clean HOUSING (4651301034) and a correctly torqued HOUSING (4651301013) to prevent cross-threading and fluid bypass. Always verify your transmission serial number against ZF documentation before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101006 | TRANSMISSION HOUSING | Main structural casing for gear train and valve body |
| 4651301034 | HOUSING | Secondary housing for shift system mounting |
| 0634303928 | O-RING | Seals shift system to prevent oil leaks |
| 4651301013 | HOUSING | Lower housing cover for shift mechanism |
| 4651301015 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4651301035 | SCREEN SHEET | Secondary filtration element for valve body |
| 0630361028 | SEALING CAP | Closes unused ports in the housing |
| 4475280060 | SCREW PLUG | Secures hydraulic passages |
| 0634303312 | O-RING | Seals screw plug connections |
| 0630361063 | SEALING CAP | Protects sensor ports from contamination |
ZF 4644.159.350 SHIFT SYSTEM – Shift System RFQ Support
PartsZF supports ZF 4644.159.350 SHIFT SYSTEM RFQs by checking the part number, related documentation, and buyer-supplied transmission context before quotation.
Part-Number Summary
Use ZF number 4644.159.350 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 | 4644.159.350 |
|---|---|
| Normalized SKU | 4644159350 |
| 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.
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