Overview
The ZF 4644.159.349 SHIFT SYSTEM is a precision-engineered mechanical assembly designed specifically for the ZF WG 100 Series powershift transmissions. This OEM genuine component governs the hydraulic and mechanical selection of forward and reverse gears, translating operator commands into precise clutch and brake engagement within the transmission housing. Positioned directly atop the valve body and interfacing with the main TRANSMISSION HOUSING, the shift system ensures smooth, repeatable gear changes under heavy load conditions. The SKU 4644.159.349 is a direct replacement unit, manufactured to original ZF tolerances for long service life in construction, agricultural, and material handling equipment.
Symptoms of Failure
- Erratic or delayed gear engagement: When the shift system wears, operators may experience a noticeable lag or “clunk” when shifting between forward and reverse, especially under load.
- Hydraulic fluid leakage at the shift cover: Degraded seals within the 4644.159.349 assembly can cause transmission oil to weep from the shift tower, often pooling on the HOUSING surface.
- Inability to hold a selected gear: A worn shift detent mechanism may cause the transmission to unexpectedly slip out of gear during operation, a critical safety concern.
- Increased shift effort or binding: Mechanical wear or contamination can make the shift lever feel stiff or notchy, requiring excessive force to change ranges.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4644.159.349 |
| OEM Reference | ZF 4644.159.349 |
| Material | High-strength aluminum alloy with hardened steel detent components |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 210 mm x 140 mm x 95 mm |
| Sealing Interface | Requires O-RING (0634303928) for proper installation |
| Mounting | Bolt-on to HOUSING (4651301013) |
Compatibility
This shift system is engineered for the ZF WG 100 Series transmission family. While primarily designed for the WG100 model, the 4644.159.349 is also compatible with the WG120, WG150, and WG180 variants due to shared shift tower mounting patterns and valve body interfaces. It is not recommended for use in WG200 or larger series transmissions without verifying housing bolt patterns. Always confirm that the mating HOUSING (4651301013) is free of cracks or wear before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101006 | TRANSMISSION HOUSING | Main structural casing for gear sets and shafts |
| 4651301034 | HOUSING | Intermediate housing for shift mechanism support |
| 0634303928 | O-RING | Seals shift system to housing to prevent fluid leaks |
| 4651301013 | HOUSING | Lower housing section for shift rail alignment |
| 4651301015 | SCREEN SHEET | Fine mesh filter for hydraulic circuit protection |
| 4651301035 | SCREEN SHEET | Secondary filter screen for shift valve body |
| 0630361028 | SEALING CAP | Closes unused hydraulic ports on the housing |
| 4475280060 | SCREW PLUG | Threaded plug for pressure test points |
| 0634303312 | O-RING | Seals screw plug and sealing cap interfaces |
| 0630361063 | SEALING CAP | Large-diameter cap for main housing ports |
ZF 4644.159.349 SHIFT SYSTEM – Shift System RFQ Support
PartsZF supports ZF 4644.159.349 SHIFT SYSTEM RFQs by checking the part number, related documentation, and buyer-supplied transmission context before quotation.
Part-Number Summary
Use ZF number 4644.159.349 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 | 4644.159.349 |
|---|---|
| Normalized SKU | 4644159349 |
| 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
- ZF 2094.306.027 GEARSHIFT SHAFT
- ZF 4616.305.015 GEARSHIFT SHAFT
- ZF 4651.106.023 SHIFT SYSTEM
- ZF 2095.106.017 SHIFT SYSTEM
- ZF 4644.159.303 SHIFT SYSTEM
