Overview
This OEM genuine ZF 4656.183.378 LOOSE PARTS kit is a critical service component for the WG 171 transmission series. It contains the specific fasteners, seals, and small hardware elements required to secure and seal the main transmission housing assembly. Without this kit, internal oil pressure cannot be maintained, and the structural integrity of the gear train is compromised. The SKU 4656.183.378 is designed to interface directly with the main casing and front section, ensuring that all loose hardware meets factory torque and material specifications.
Symptoms of Failure
- External oil seepage at housing joints: When the loose parts in this kit degrade or are reused, the sealing surfaces lose compression, leading to visible oil leaks around the transmission housing.
- Transmission gear slipping under load: Worn or missing fasteners from the 4656.183.378 assembly can cause internal components to shift, resulting in intermittent gear engagement and power loss.
- Abnormal vibration or driveline noise: Loose hardware allows the TRANSMISSION HOUSING to flex, creating audible rumbling or knocking during operation.
- Difficulty shifting between ranges: A compromised seal from degraded loose parts can cause hydraulic pressure drops, making gear changes sluggish or unresponsive.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4656.183.378 |
| Material Composition | Steel alloy with zinc plating; nitrile rubber seals |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 180 mm x 120 mm x 40 mm |
| OEM Reference | ZF 4656.183.378 |
| Torque Specification | 45 Nm ± 5 Nm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This loose parts kit is engineered primarily for the ZF WG 171 series. It is also compatible with the WG 180, WG 200, and WG 150 series transmissions that share the same housing architecture. The kit is essential when replacing the HOUS.FRONT SECT or the TUBE assembly, as these components require fresh hardware to maintain structural integrity. Always verify your transmission model number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101072 | TRANSMISSION HOUSING | Main structural casing for gear and shaft assembly |
| 4656301168 | HOUS.FRONT SECT | Front section housing for input shaft and bearings |
| 4656201015 | SCREEN SHEET | Filter screen for hydraulic fluid debris protection |
| 4656301037 | TUBE | Fluid passage tube for lubrication circuits |
| 0634313514 | O-RING | Sealing ring for fluid connections |
| 0636100803 | CAP SCREW | Fastener for housing attachment points |
| 4656301169 | HOUSING REAR PART | Rear section housing for output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise housing positioning |
| 0636100801 | CAP SCREW | Fastener for front section mounting |
| 0636100160 | CAP SCREW | Fastener for rear housing attachment |
Frequently Asked Questions
Q: Can I reuse the old fasteners from my WG171 transmission instead of buying this kit?
A: No. ZF specifies that all fasteners in the 4656.183.378 kit are single-use due to torque-to-yield design. Reusing them risks fastener fatigue and oil leaks.
Q: Does this kit include the screen sheet and tube?
A: No. This kit contains only the loose hardware (bolts, seals, pins). The SCREEN SHEET and TUBE are separate components that must be ordered individually.
Q: How do I confirm this fits my transmission?
A: Check the transmission model plate on the housing. This kit is standard for WG171, WG180, and WG200 series. If your unit uses a different housing front section, verify the bolt pattern matches the HOUS.FRONT SECT dimensions.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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