Overview
The ZF 4644.159.310 SHIFT SYSTEM is a precision-engineered OEM genuine component designed exclusively for the ZF WG250 series transmission. This critical assembly governs gear selection and engagement, translating driver input into smooth, reliable shifts within the heavy-duty powertrain. Positioned directly within the transmission housing, the shift system interfaces with the main shaft and selector forks to control hydraulic and mechanical actuation. As an original equipment part, the SKU 4644.159.310 ensures exact fitment and factory-specified performance, eliminating the guesswork of aftermarket alternatives. For optimal structural integrity, this shift system is often installed alongside the TRANSMISSION HOUSING and the HOUSING to maintain precise alignment under load.
Symptoms of Failure
When the ZF 4644.159.310 shift system deteriorates, operators may notice distinct operational issues. Gear engagement hesitation or grinding during upshifts or downshifts is a primary indicator, often caused by worn shift forks or detent springs. Unexplained transmission oil leaks around the shift tower area suggest seal degradation, allowing fluid to bypass the COVER interface. Another common failure is gear slipping under heavy torque, where the shift system fails to hold the selected ratio, leading to sudden RPM surges. Finally, stiff or imprecise shift lever movement points to internal corrosion or debris within the shift mechanism, often requiring replacement of the CONNECTING PART to restore proper linkage.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4644.159.310 |
| OEM Reference | ZF 4644.159.310 |
| Material | Hardened steel alloy with corrosion-resistant coating |
| Weight | 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 210 mm x 95 mm x 80 mm |
| Compatible Transmission Series | WG250 |
| Fastener Torque Spec | 45 Nm (33 ft-lbs) |
| Seal Type | Integrated O-ring (replaceable) |
Compatibility
This shift system is specifically engineered for the ZF WG250 transmission model, which is widely used in medium-duty trucks, buses, and off-highway equipment. Based on its design architecture, the 4644.159.310 is also compatible with the WG180 and WG200 series transmissions, as these share a common shift housing interface and actuator geometry. For applications in the WG211 or WG240 variants, verify the shift tower bolt pattern and linkage length before installation. Always pair this part with the correct HEXAGON SCREW and CAP SCREW to secure the assembly to the transmission case.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101062 | TRANSMISSION HOUSING | Encloses and supports all internal gear sets and shift components |
| 4646301104 | HOUSING | Provides mounting surface for shift system and seals internal oil passages |
| 4646301300 | COVER | Protects shift mechanism from debris and retains lubrication |
| 4646323018 | CONNECTING PART | Links shift lever to internal selector forks for precise actuation |
| 0636015304 | HEXAGON SCREW | Secures shift system housing to transmission case |
| 0636101828 | CAP SCREW | Fastens cover and shift tower components |
| 4646301100 | COVER SHEET | Thin gasket layer preventing oil seepage at shift tower interface |
| 4646301112 | COVER SHEET | Alternate thickness gasket for precise clearance adjustment |
| 0730365067 | TYPE PLATE | Identification label with transmission model and serial number |
| 0631311009 | GROOVED STUD | Alignment pin for shift system positioning during assembly |
ZF 4644.159.310 SHIFT SYSTEM – Shift System RFQ Support
PartsZF supports ZF 4644.159.310 SHIFT SYSTEM RFQs by checking the part number, related documentation, and buyer-supplied transmission context before quotation.
Part-Number Summary
Use ZF number 4644.159.310 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 | 4644.159.310 |
|---|---|
| Normalized SKU | 4644159310 |
| 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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