Overview
The ZF 4644.159.355 SHIFT SYSTEM is a precision-engineered OEM genuine component designed for the WG 150 Series transmission. This critical assembly governs the selection and engagement of forward and reverse gears, translating driver input into precise hydraulic valve actuation within the transmission control unit. Positioned directly atop the main valve body, the shift system interfaces with the TRANSMISSION HOUSING (4642101109) and the TRANSMISSION HOUSING (4642301205) to ensure leak-free operation. The SKU 4644.159.355 is a direct replacement for worn units, restoring crisp shift feel and eliminating driveline hesitation in heavy-duty applications.
Symptoms of Failure
- Delayed or erratic gear engagement: When the shift system wears, operators may notice a 2-3 second lag when shifting from neutral to drive or reverse, often accompanied by a harsh clunk.
- Transmission fluid leaks at the shift tower: Deteriorated seals within the 4644.159.355 assembly allow ATF to seep past the TYPE PLATE (0730365125) interface, leaving visible drips on the housing exterior.
- Inability to hold gear under load: A failing shift system may cause the transmission to slip out of gear during uphill climbs or heavy towing, as internal detent mechanisms lose their positive locking force.
- Stiff or binding shift lever movement: Corrosion or debris in the shift mechanism creates resistance, making it difficult to move the selector through its full range of motion.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4644.159.355 |
| Material | Die-cast aluminum alloy with hardened steel detent pins |
| Overall Length | 185 mm |
| Mounting Bolt Pattern | 4-hole, 90 mm spacing |
| Weight | 1.2 kg (2.65 lbs) |
| Seal Type | Viton O-ring (integrated) |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 4644.159.355 |
Compatibility
This shift system is engineered for the ZF WG 150 Series transmission family. It is directly compatible with WG150, WG151, and WG152 models used in medium-duty trucks, buses, and off-highway equipment. The 4644.159.355 also fits select WG180 and WG200 variants when paired with the correct GROOVED STUD (0631311009) kit. Always verify your transmission serial number against the OEM parts list before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301205 | TRANSMISSION HOUSING | Secondary housing for valve body section |
| 0730365125 | TYPE PLATE | Identification tag with transmission specs |
| 0631311009 | GROOVED STUD | Alignment dowel for shift system mounting |
| 4642301168 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4642301169 | SCREEN SHEET | Coarse debris screen for oil pan |
| 0636100621 | HEXAGON SCREW | M10x25 mounting bolt for cover plates |
| 4642301186 | SCREEN SHEET | Magnetic screen for ferrous particle capture |
| 4644106300 | SHIFT SYSTEM | Alternate shift assembly for WG200 series |
| 4644306500 | COVER PLATE | Sealing plate for shift system access port |
ZF 4644.159.355 SHIFT SYSTEM – Shift System RFQ Support
PartsZF supports ZF 4644.159.355 SHIFT SYSTEM RFQs by checking the part number, related documentation, and buyer-supplied transmission context before quotation.
Part-Number Summary
Use ZF number 4644.159.355 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 | 4644.159.355 |
|---|---|
| Normalized SKU | 4644159355 |
| 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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