Overview
The ZF 4657.183.278 LOOSE PARTS for WG211 is a genuine OEM service kit designed to restore the internal integrity of your ZF WG211 transmission. This assembly contains the critical loose components—such as seals, thrust washers, and retaining elements—that secure the rotating clutch packs and planetary gear sets within the main housing. By replacing these worn items, you prevent axial play and maintain precise hydraulic pressure routing. The SKU 4657.183.278 is the exact factory-specified set for the WG211 series, ensuring a direct fit when paired with the TRANSMISSION HOUSING and the HOUS.FRONT SECT.
Symptoms of Failure
- Intermittent gear slipping under load: Worn loose parts allow the clutch packs to lose clamping force, causing the transmission to slip when climbing grades or carrying heavy loads.
- Delayed engagement from Neutral to Drive: Degraded seals and thrust washers within the 4657.183.278 set reduce hydraulic hold, resulting in a noticeable lag when shifting.
- Metallic rattling or knocking from the bell housing: Excessive axial clearance from worn loose components permits the planetary gears to shift, creating a distinct rattle at idle.
- Low hydraulic pressure warnings on the dash: Internal leakage past worn loose parts can trigger pressure drop codes, often misdiagnosed as a pump failure.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.183.278 |
| OEM Reference | ZF 4657.183.278 |
| Material Composition | Steel alloy with nitrile rubber seals |
| Weight (approx.) | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 120 mm x 80 mm x 40 mm |
| Compatible Housing | HOUSING REAR PART |
| Retaining Hardware | CYLINDRICAL PIN (sold separately) |
Compatibility
This loose parts kit is engineered specifically for the ZF WG211 series, but it also serves as a direct replacement for earlier WG180 and WG200 variants that share the same clutch drum and piston geometry. It is not backward-compatible with the WG120 or WG150 families. For a complete rebuild, always verify the condition of the HOUS.FRONT SECT and the TRANSMISSION HOUSING to ensure no scoring or warping has occurred.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing that encloses all rotating assemblies |
| 4657301130 | HOUS.FRONT SECT | Front section housing the input shaft and pump drive |
| 4657301131 | HOUSING REAR PART | Rear section supporting the output flange and governor |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0636102489 | CAP SCREW | M10 x 35mm bolt for housing fastening |
| 4656301148 | FIXING PLATE | Locking plate for clutch piston retention |
| 0636102463 | CAP SCREW | M8 x 25mm bolt for valve body attachment |
| 4657201133 | SCREEN SHEET | Fine mesh filter protecting the oil pump inlet |
| 0636115287 | CAP SCREW | M12 x 40mm bolt for rear housing |
| 4657301065 | PLATE | Thrust plate for planetary gear axial control |
Frequently Asked Questions
Q: Can I install the 4657.183.278 kit without removing the transmission from the vehicle?
A: No. This kit requires full disassembly of the WG211 main housing. You must remove the transmission and separate the TRANSMISSION HOUSING from the HOUS.FRONT SECT to access the loose components.
Q: Does this kit include the CYLINDRICAL PIN for alignment?
A: No. The 4657.183.278 set contains only the loose wear items (seals, washers, clips). The CYLINDRICAL PIN and all cap screws must be ordered separately.
Q: How do I confirm the 4657.183.278 fits my WG211 serial number?
A: Check the casting number on the HOUSING REAR PART. If it reads WG211-xxx, this kit is compatible. For WG180 or WG200 units, verify the clutch drum diameter matches 140 mm.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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