Overview
The ZF 4644.159.356 SHIFT SYSTEM is a precision-engineered OEM genuine component designed exclusively for the WG 150 series transmission. This critical assembly governs the hydraulic selection of forward, neutral, and reverse gears by directing oil flow through the valve body. Positioned within the transmission control module, the shift system interfaces directly with the TRANSMISSION HOUSING and the TRANSMISSION HOUSING to ensure smooth, reliable gear engagement under heavy loads. The SKU 4644.159.356 is manufactured to ZF’s original tolerances, guaranteeing a direct fit and consistent performance in demanding industrial applications.
Symptoms of Failure
When the ZF 4644.159.356 SHIFT SYSTEM wears out, operators may notice specific operational issues. Look for these failure symptoms to diagnose a failing shift system:
- Delayed or harsh gear engagement: The transmission hesitates or clunks when shifting between forward and reverse, often accompanied by a noticeable lag.
- Intermittent gear slipping: Under load, the transmission may momentarily lose power as the shift system fails to maintain proper hydraulic pressure, causing the vehicle to surge or drop RPM.
- Oil leaks around the shift valve body: Worn seals or cracked components within the 4644.159.356 can allow transmission fluid to seep past the TYPE PLATE and housing interface, leaving visible puddles under the drivetrain.
- Erratic neutral-to-drive transitions: The shift system may fail to fully engage a selected gear, resulting in a grinding noise or temporary loss of drive until the system resets.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4644.159.356 |
| OEM Reference | ZF 4644.159.356 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 1.2 kg (2.65 lbs) |
| Dimensions (L x W x H) | 180 mm x 95 mm x 65 mm |
| Seal Type | Integrated O-ring (NBR) |
| Operating Pressure | 10–18 bar (145–261 psi) |
| Compatible Fasteners | HEXAGON SCREW (M8 x 20 mm) |
Compatibility
The ZF 4644.159.356 SHIFT SYSTEM is specifically engineered for the WG 150 series transmission. Based on its design and hydraulic flow characteristics, this part is also compatible with the following ZF models: WG 150, WG 151, and WG 152. It is not recommended for use in WG 180 or WG 200 series units without verifying the valve body configuration. The shift system mounts directly to the GROOVED STUD and aligns with the housing bore to ensure leak-free operation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses the gear train and shift system |
| 4642301205 | TRANSMISSION HOUSING | Secondary housing for clutch pack assembly |
| 0730365125 | TYPE PLATE | Identification tag with serial number |
| 0631311009 | GROOVED STUD | Alignment pin for shift system mounting |
| 4642301168 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4642301169 | SCREEN SHEET | Coarse mesh pre-filter for oil sump |
| 0636100621 | HEXAGON SCREW | Fastener for shift system cover plate |
| 4642301186 | SCREEN SHEET | High-flow filter for clutch circuit |
| 4644106319 | SHIFT SYSTEM | Alternate shift valve assembly |
| 4644306524 | PISTON | Hydraulic actuator for clutch engagement |
ZF 4644.159.356 SHIFT SYSTEM – Shift System RFQ Support
ZF 4644.159.356 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 4644.159.356 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 | 4644.159.356 |
|---|---|
| Normalized SKU | 4644159356 |
| 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 4651.106.023 SHIFT SYSTEM
- ZF 2095.106.017 SHIFT SYSTEM
- ZF 4644.159.303 SHIFT SYSTEM
