Overview
The ZF 4644.106.324 SHIFT SYSTEM is a precision-engineered OEM genuine component designed exclusively for the WG 150 Series transmission. This critical assembly governs the hydraulic actuation of gear selection, converting driver commands into precise clutch and brake engagements within the planetary gearset. Positioned directly atop the main control housing, the shift system interfaces with the valve body to modulate oil flow, ensuring smooth, reliable shifting under heavy-duty loads. The SKU 4644.106.324 is a direct replacement part that restores factory shift quality and eliminates driveline hesitation. For complete transmission integrity, this shift system is often paired with a robust TRANSMISSION HOUSING (4642101109) or the alternative TRANSMISSION HOUSING (4642301205), which provides the structural foundation for the entire assembly.
Symptoms of Failure
When the ZF 4644.106.324 shift system deteriorates, operators will notice distinct performance degradation. Common failure indicators include:
- Delayed or harsh gear engagement: Worn internal spools or springs cause sluggish shifts, especially when moving from neutral to drive or reverse.
- Intermittent gear slipping under load: The shift system fails to maintain hydraulic pressure, leading to momentary loss of torque during acceleration.
- Erratic shift patterns or failure to shift: Internal wear prevents proper valve positioning, resulting in stuck gears or unexpected neutral conditions.
- External oil seepage around the shift cover: Degraded seals allow transmission fluid to escape, often visible as drips near the shift mechanism.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4644.106.324 |
| OEM Reference | ZF 4644.106.324 |
| Material | High-grade cast aluminum alloy with hardened steel spools |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 210 mm x 140 mm x 95 mm |
| Operating Pressure | 12–18 bar (174–261 psi) |
| Seal Type | Nitrile rubber (NBR) O-rings |
Compatibility
This shift system is engineered for the ZF WG 150 Series transmission, commonly found in medium-duty trucks, buses, and off-highway equipment. Based on its design and hydraulic architecture, the 4644.106.324 is also compatible with the WG 180 and WG 200 series transmissions, as these models share a similar shift valve layout. For optimal performance, always verify the transmission serial number. When servicing, consider inspecting the TYPE PLATE (0730365125) for correct model identification and the GROOVED STUD (0631311009) for secure mounting.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gearset |
| 4642301205 | TRANSMISSION HOUSING | Alternative housing variant |
| 0730365125 | TYPE PLATE | Identification and rating plate |
| 0631311009 | GROOVED STUD | Fastening stud for shift assembly |
| 4642301168 | SCREEN SHEET | Oil filtration mesh |
| 4642301169 | SCREEN SHEET | Fine filtration screen |
| 0636100621 | HEXAGON SCREW | Mounting bolt for valve block |
| 4642301186 | SCREEN SHEET | Secondary filter element |
| 4644306598 | PLATE | Cover plate for shift mechanism |
| 4644306596 | VALVE BLOCK | Hydraulic control manifold |
ZF 4644.106.324 SHIFT SYSTEM – Shift System RFQ Support
ZF 4644.106.324 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 4644.106.324 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 | 4644.106.324 |
|---|---|
| Normalized SKU | 4644106324 |
| 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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