Overview
The ZF 4644.306.573 FIXING PLATE is a precision-engineered retention component designed to secure critical gear assemblies within the differential housing of heavy-duty ZF transmissions. This OEM genuine part, identified by SKU 4644.306.573, functions as a mechanical lock that prevents axial movement of the differential gears and shaft components during high-torque operation. Positioned directly against the differential carrier in the WG 180 and WG 200 series, this fixing plate ensures that the 5838109012: DIFFERENTIAL remains properly seated, maintaining optimal gear mesh alignment. Without this plate, the entire differential assembly risks catastrophic misalignment under load.
Symptoms of Failure
- Differential housing oil seepage: A worn or cracked fixing plate allows lubricant to escape past the carrier seal, leaving visible drips under the transmission bell housing.
- Intermittent gear slipping under load: When the plate loses its clamping force, the 2093209023: DIFFERENTIAL can shift axially, causing momentary loss of drive torque during acceleration.
- Metallic grinding noise from the differential area: A loose fixing plate permits the 0750117075: TAPER ROLLER BEARING to contact the housing wall, producing a distinct grinding sound at highway speeds.
- Excessive backlash in the driveline: As the plate deforms, the 5838300626: DIFFERENTIAL HOUSING experiences increased play, leading to a clunking sensation when shifting between forward and reverse gears.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.306.573 |
| Material | High-tensile steel, zinc-plated |
| Thickness | 4.2 mm |
| Outer Diameter | 112 mm |
| Bolt Hole Pattern | 4 x 10.5 mm (equally spaced) |
| Weight | 0.18 kg |
| OEM Reference | ZF 4644.306.573 |
| Surface Hardness | HRC 32-38 |
Compatibility
This fixing plate is engineered for the ZF WG 180 series and WG 200 series transmissions. It is a direct fit for models including WG180, WG180C, WG200, and WG200C used in medium-duty trucks, buses, and off-highway equipment. The plate interfaces specifically with the 5838300626: DIFFERENTIAL HOUSING and supports the 5838109012: DIFFERENTIAL assembly. Always verify your transmission serial number against ZF application charts before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between axles |
| 0750117075 | TAPER ROLLER BEARING | Supports differential carrier rotation |
| 2093209023 | DIFFERENTIAL | Secondary torque distribution unit |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses gear set and lubricant |
| 0631329088 | SPRING PIN | Locks fixing plate to carrier |
| 5838300811 | THRUST WASHER | Reduces axial friction on gears |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to wheel axles |
| 5838300633 | AXLE | Connects differential to wheel hub |
| 5838300753 | THRUST WASHER | Controls side gear clearance |
| 5838300818 | THRUST WASHER | Prevents pinion gear wear |
Frequently Asked Questions
Q: Can I reuse the ZF 4644.306.573 fixing plate during a differential rebuild?
A: No. This plate undergoes plastic deformation during initial torquing to create a locking fit. Always replace it with a new OEM unit to maintain proper clamping force and prevent fastener loosening.
Q: Does this fixing plate require a specific torque sequence?
A: Yes. ZF specifies a cross-tightening pattern at 45 Nm followed by a 90-degree angle turn. Failure to follow this sequence can warp the plate and cause the 0750117075: TAPER ROLLER BEARING to bind.
Q: Will the 4644.306.573 fit the WG200 series with a locking differential?
A: Yes, it is compatible with both open and locking differential variants in the WG200 series. However, verify that the 5838300626: DIFFERENTIAL HOUSING has the same bolt pattern as your unit.
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