Overview
The ZF 4644.159.236 SHIFT SYSTEM is a precision-engineered mechanical assembly designed specifically for the WG 201 series of powershift transmissions. This OEM genuine component governs the hydraulic and mechanical engagement of gear ratios, translating operator commands into smooth, reliable shifts under heavy-duty loads. Positioned within the transmission valve body and control housing, the shift system interfaces directly with the main shaft and clutch packs to regulate oil flow and pressure. The SKU 4644.159.236 is a direct replacement for worn or damaged units, ensuring original equipment performance and durability in demanding industrial applications such as construction, mining, and material handling equipment.
Symptoms of Failure
- Erratic or delayed gear engagement – When the shift system wears, operators may experience hesitation or harsh engagement when moving between forward and reverse gears, often accompanied by a noticeable lag.
- Transmission slipping under load – A failing 4644.159.236 can cause the transmission to momentarily lose power delivery during acceleration or incline operation, leading to reduced productivity and potential drivetrain damage.
- Internal oil leaks around the shift housing – Degraded seals or worn shift forks allow transmission fluid to escape, visible as drips or wet spots near the control housing, which can lead to low fluid levels and overheating.
- Unusual mechanical noise during shifting – Grinding, clunking, or whining sounds when changing gears indicate worn shift components or misalignment, requiring immediate inspection of the shift system assembly.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4644.159.236 |
| OEM Reference | ZF 4644.159.236 |
| Material | High-grade cast iron with hardened steel shift forks |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Overall Length | 210 mm |
| Mounting Hole Center Distance | 160 mm |
| Seal Type | Integrated O-ring and sealing ring compatible |
| Operating Temperature Range | -20°C to +120°C |
Compatibility
This ZF 4644.159.236 SHIFT SYSTEM is engineered for the WG 201 series transmissions, including models such as WG180, WG200, and WG211. It is also compatible with select variants of the WG150 and WG160 series that share the same shift housing architecture. For proper fitment, always verify your transmission model and serial number against the OEM parts catalog. The shift system integrates directly with the TRANSMISSION HOUSING (4644101203) and the TRANSMISSION HOUSING (4644301382), which provide the structural mounting and fluid channels. Additionally, the THREADED BUSH (4644301189) and SCREW PLUG (0636302005) are commonly replaced during shift system service to ensure leak-free operation and secure fastening.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101203 | TRANSMISSION HOUSING | Main structural housing for gear and shift assembly |
| 4644301382 | TRANSMISSION HOUSING | Alternate housing variant for WG201 series |
| 4644301189 | THREADED BUSH | Provides threaded mounting point for shift components |
| 0636302005 | SCREW PLUG | Seals oil passages and prevents contamination |
| 0634306198 | O-RING | Hydraulic seal between shift system and housing |
| 0634801098 | SEALING RING | Prevents fluid leakage at shift shaft interface |
| 0730365067 | TYPE PLATE | Identification plate for transmission model and specs |
| 0631311009 | GROOVED STUD | Alignment and retention pin for shift mechanism |
| 4644301161 | COVER PLATE | Protects shift system from debris and damage |
| 0636100621 | HEXAGON SCREW | Fastens shift system and cover plate securely |
ZF 4644.159.236 SHIFT SYSTEM – Shift System RFQ Support
PartsZF supports ZF 4644.159.236 SHIFT SYSTEM RFQs by checking the part number, related documentation, and buyer-supplied transmission context before quotation.
Part-Number Summary
Use ZF number 4644.159.236 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 | 4644.159.236 |
|---|---|
| Normalized SKU | 4644159236 |
| 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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