Overview
The ZF 4644.159.357 SHIFT SYSTEM is a precision-engineered OEM genuine component designed specifically for the WG 200 Series transmission family. This critical assembly governs the selection and engagement of forward and reverse gears, translating driver commands into precise hydraulic valve movements within the transmission control unit. As a direct replacement for the original factory part, the SKU 4644.159.357 ensures exact fitment and reliable shift quality, restoring the transmission’s original performance characteristics. This shift system interfaces directly with the TRANSMISSION HOUSING (4644101249) and the TRANSMISSION HOUSING (4644301402), forming the core of the gear selection mechanism.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn shift system often causes noticeable hesitation when shifting from neutral to drive or reverse, followed by an abrupt, jarring engagement.
- Intermittent gear slipping under load: As internal components wear, the system may fail to maintain consistent hydraulic pressure, leading to momentary loss of power during acceleration or climbing.
- Transmission fluid leaks near the shift mechanism: Degraded seals within the shift system can allow ATF to seep past the O-RING (0634306323), leaving visible drips on the housing exterior.
- Inability to shift into specific gears: Mechanical binding or internal valve wear may prevent the system from engaging certain gear ranges, often accompanied by a grinding noise.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number / SKU | 4644.159.357 |
| OEM Reference | ZF 4644.159.357 |
| Material | High-strength aluminum alloy with hardened steel valve spools |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 320 mm x 180 mm x 95 mm |
| Sealing Surface Finish | Ra ≤ 0.8 µm |
| Operating Temperature Range | -40°C to +120°C |
| Compatible Housing | 4644101249 & 4644301402 |
Compatibility
This shift system is engineered for the ZF WG 200 Series, including the WG180, WG200, and WG210 models. It is also compatible with certain variants of the ZF Ecomat 4HP and 5HP series that share the same shift valve body architecture. Always verify the COVER PLATE (4644301298) and housing configuration to ensure correct fitment for your specific transmission serial number.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101249 | TRANSMISSION HOUSING | Main structural casing for shift system mounting |
| 4644301402 | TRANSMISSION HOUSING | Alternate housing variant for WG200 series |
| 4644301298 | COVER PLATE | Seals and protects shift mechanism access port |
| 0634306323 | O-RING | Prevents fluid leakage at shift system interface |
| 0636305026 | SCREW PLUG | Seals hydraulic test ports on the shift body |
| 4644301279 | SCREEN SHEET | Filters debris from shift system hydraulic fluid |
| 4644301088 | SEALING CAP | Protects shift valve bores during assembly |
| 4644306513 | COVER | Lower shift mechanism cover plate |
| 4644306555 | COVER | Upper shift mechanism cover variant |
| 4644306556 | COVER | Side shift mechanism cover for specific models |
ZF 4644.159.357 SHIFT SYSTEM – Shift System RFQ Support
ZF 4644.159.357 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 4644.159.357 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 | 4644.159.357 |
|---|---|
| Normalized SKU | 4644159357 |
| 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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