Overview
The ZF 4646.183.125 LOOSE PARTS kit is a critical service assembly designed specifically for the WG 210 series transmission. This OEM genuine part set contains the essential loose components—including seals, retainers, and small hardware—that secure and seal the internal hydraulic circuits within the transmission valve body and housing interface. The SKU 4646.183.125 is engineered to restore factory tolerances during a rebuild or overhaul, preventing cross-leakage between clutch packs and maintaining precise line pressure. When installed alongside the TRANSMISSION HOUSING and the HOUS.FRONT SECT, this loose parts kit ensures the entire assembly operates as a sealed, pressure-tight unit.
Symptoms of Failure
When the ZF 4646.183.125 LOOSE PARTS begin to degrade, operators typically notice three distinct failure modes. First, erratic shift timing occurs as internal seals lose elasticity, causing delayed engagement between 2nd and 3rd gear. Second, external oil seepage from the housing mating surfaces becomes visible, often mistaken for a pan gasket leak. Third, intermittent loss of drive under heavy load—particularly in reverse—indicates that the loose components can no longer maintain hydraulic lock. These symptoms are common in high-mileage WG210 units where the original loose parts have hardened from thermal cycling.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4646.183.125 |
| OEM Reference | ZF 4646.183.125 |
| Material Composition | Nitrile rubber seals, hardened steel retainers, zinc-plated fasteners |
| Weight (approx.) | 0.45 kg (1.0 lb) |
| Dimensions (packaged) | 180 mm x 120 mm x 40 mm |
| Operating Temperature Range | -40°C to +150°C |
| Hardware Included | O-rings, backup rings, snap rings, thrust washers |
Compatibility
This loose parts kit is primarily validated for the ZF WG 210 series, but it also cross-fits select earlier models. Based on the part geometry and seal profile, the 4646.183.125 is compatible with the WG180, WG200, and WG211 transmissions when used in conjunction with the correct HOUSING REAR PART. For applications requiring additional retention, the CYLINDRICAL PIN must be ordered separately to align the housing sections during assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101031 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201027 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4657201020 | HOUSING REAR PART | Rear housing section for output shaft support |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | Fastener for valve body attachment |
| 4656301148 | FIXING PLATE | Retention plate for clutch piston |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | Hex-head bolt for housing flange |
| 4681301040 | OIL FEED.HOUSG. | Oil feed tube housing for lubrication |
Frequently Asked Questions
Q: Can the 4646.183.125 kit be reused after a transmission teardown?
A: No. ZF engineering recommends replacing all loose parts in this kit with new OEM components every time the transmission housing is separated. The seals and retainers are single-use items that lose their interference fit after initial compression.
Q: Does this kit include the CYLINDRICAL PIN for alignment?
A: No. The CYLINDRICAL PIN is a separate line item (part 0631306792) and must be ordered independently to ensure proper dowel alignment between the front and rear housing sections.
Q: Will these loose parts work with a WG180 transmission that has been modified for higher torque?
A: Yes, the 4646.183.125 is compatible with modified WG180 units, provided the HOUSING REAR PART is also upgraded to the WG210 spec. The seal cross-sections are identical across the WG series for this application.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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