Overview
The ZF 4644.106.225 SHIFT SYSTEM is a precision-engineered OEM genuine component designed exclusively for the ZF WG 200 Series powershift transmissions. This assembly governs the directional and range shifting within the transmission, converting hydraulic pilot signals into mechanical engagement of the clutch packs. Positioned within the upper valve body section, the shift system directly interfaces with the 4644105475 DISCONNECTION mechanism to ensure smooth, positive gear changes under load. As a genuine ZF part, SKU 4644.106.225 guarantees exact fitment and factory-specified shift timing, eliminating the guesswork of aftermarket alternatives.
Symptoms of Failure
- Delayed or harsh gear engagement: When the shift system wears, operators experience a noticeable lag or a jarring “clunk” when moving between forward and reverse, especially under heavy load.
- Intermittent gear slippage under load: A failing shift system can cause the transmission to momentarily lose power during acceleration, often mistaken for clutch pack failure.
- Hydraulic fluid contamination from internal debris: Worn shift spools or seals can shed metallic particles into the oil, leading to clogged filters and erratic shift patterns.
- Neutral creep or unintended disengagement: A worn detent mechanism within the shift system may fail to hold the selected gear, causing the vehicle to drift in neutral.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4644.106.225 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Overall Length | 185 mm (approx.) |
| Weight | 1.2 kg (2.65 lbs) |
| Operating Pressure | 12–18 bar (174–261 psi) |
| Seal Type | Integrated PTFE backup rings |
| OEM Reference | ZF WG 200 Series |
Compatibility
This shift system is engineered for the ZF WG 200 series of powershift transmissions, including the WG180, WG200, and WG210 variants. It is commonly found in agricultural tractors, wheel loaders, and industrial forklifts. The part directly mounts to the 4644101134 TRANSMISSION HOUSING and works in conjunction with the 4642303097 OUTPUT FLANGE to complete the driveline assembly. Always verify your transmission serial number before ordering, as minor revisions exist between early and late WG200 builds.
During installation, the shift system is secured using 0636020211 HEXAGON SCREW fasteners, which must be torqued to factory specifications to prevent oil leaks. For a complete overhaul, inspect the mating surfaces of the housing and replace any worn seals simultaneously.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105475 | Disconnection | Isolates transmission from engine during shift events |
| 4642303097 | Output Flange | Transfers torque to driveshaft |
| 0636020211 | Hexagon Screw | Secures shift system to housing |
| 4644101134 | Transmission Housing | Main structural casing for all internal components |
| 4644301349 | Housing | Secondary cover for valve body area |
| 0730365125 | Type Plate | Identification tag with transmission specs |
| 0631311009 | Grooved Stud | Alignment dowel for precise assembly |
| 0636305019 | Screw Plug | Seals hydraulic test ports |
| 4644301247 | Threaded Bush | Reinforced insert for high-torque fasteners |
| 0634303485 | O-Ring | Hydraulic seal between shift system and valve body |
ZF 4644.106.225 SHIFT SYSTEM – Shift System RFQ Support
ZF 4644.106.225 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 4644.106.225 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 | 4644.106.225 |
|---|---|
| Normalized SKU | 4644106225 |
| 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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