Overview
The ZF 4644.106.301 SHIFT SYSTEM is a precision-engineered OEM genuine component designed specifically for the WG200 and WG201 transmission series. This critical assembly governs the hydraulic actuation of gear changes, translating driver commands into smooth, reliable shifts. Positioned within the valve body area of the transmission, it interfaces directly with the VALVE BLOCK to regulate oil flow to clutches and brakes. The SKU 4644.106.301 ensures exact fitment and factory-specified performance, eliminating guesswork during rebuilds or repairs. When paired with a properly sealed TRANSMISSION HOUSING, this shift system maintains the hydraulic integrity required for heavy-duty commercial applications.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn shift system causes noticeable lag when shifting from Neutral to Drive or Reverse, often accompanied by a jarring clunk.
- Intermittent gear slipping under load: As internal seals degrade, the system fails to hold pressure, leading to momentary loss of power during acceleration on inclines.
- Hydraulic fluid contamination: Metal shavings or debris from a failing shift mechanism can circulate through the system, accelerating wear on the O-RING and adjacent seals.
- Erratic shift patterns: The transmission may skip gears or hunt between ratios due to inconsistent pilot pressure from a compromised shift system.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4644.106.301 |
| OEM Reference | ZF 4644.106.301 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 1.85 kg (4.08 lbs) |
| Dimensions (L x W x H) | 210 mm x 95 mm x 65 mm |
| Sealing Interface | Compatible with O-RING 0634306198 |
| Mounting Hardware | Requires SCREW PLUG 4475280043 |
Compatibility
This shift system is engineered for the ZF WG200 and WG201 series transmissions, commonly found in municipal buses, fire trucks, and heavy construction vehicles. While primarily designed for these models, it may also be retrofitted into earlier WG180 variants when used with the appropriate TRANSMISSION HOUSING. Always verify your transmission serial number against the OEM parts catalog. The 4644.106.301 replaces superseded part numbers and integrates seamlessly with the SHIFT SYSTEM 4644159302 in certain rebuild kits.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101232 | TRANSMISSION HOUSING | Encloses and supports the shift system assembly |
| 4644301282 | TRANSMISSION HOUSING | Alternate housing for WG200 series applications |
| 4475280043 | SCREW PLUG | Secures hydraulic passages in the shift system |
| 0634306198 | O-RING | Provides leak-proof seal at shift system interface |
| 0730365067 | TYPE PLATE | Identification plate for transmission model verification |
| 4644301298 | COVER PLATE | Protects shift system from external debris |
| 4644306507 | COVER PLATE | Reinforced cover for high-torque applications |
| 4644159302 | SHIFT SYSTEM | Alternative shift system variant for WG201 |
| 4644306560 | VALVE BLOCK | Distributes hydraulic pressure to shift system |
| 4644306408 | WASHER | Hardened washer for shift system mounting bolts |
ZF 4644.106.301 SHIFT SYSTEM – Shift System RFQ Support
PartsZF helps B2B buyers source ZF 4644.106.301 SHIFT SYSTEM with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This shift system page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 4644.106.301 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 | 4644.106.301 |
|---|---|
| Normalized SKU | 4644106301 |
| Part name | SHIFT SYSTEM |
| Product category | shift system |
| Cross-reference support | Available for RFQ review |
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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