Overview
The ZF 4656.183.323 LOOSE PARTS for WG171 is a critical internal component set designed to maintain the precise hydraulic and mechanical clearances within the WG 171 series transmission. This OEM genuine part, identified by SKU 4656.183.323, functions as a collection of fasteners, seals, and spacers that secure the valve body and clutch assemblies. Without this specific loose parts kit, the transmission cannot maintain proper oil pressure, leading to inefficient gear engagement. It sits directly within the main control housing, interfacing with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to ensure a leak-free assembly.
Symptoms of Failure
When the 4656.183.323 loose parts degrade or are lost during service, operators will notice distinct performance issues. Look for these specific failure symptoms:
- Intermittent gear slippage under load: Worn spacers or bolts cause the clutch pack to lose clamping force, resulting in a temporary loss of power transfer.
- External oil seepage from the main housing joint: Damaged seals within the kit allow transmission fluid to escape, often visible as a wet line around the SCREEN SHEET interface.
- Delayed engagement when shifting from Neutral to Drive: Internal leakage past the valve body fasteners reduces pilot pressure, causing a 2-3 second hesitation.
- Metallic rattling noise from the bell housing: Loose retaining hardware can vibrate against the TUBE assembly, indicating imminent fastener failure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4656.183.323 |
| OEM Reference | ZF WG171 Series |
| Material Composition | Steel (fasteners) / NBR (seals) |
| Estimated Weight | 0.45 kg (1.0 lb) |
| Kit Contents | Bolts, washers, O-rings, retaining clips |
| Operating Temperature Range | -40°C to +120°C |
| Thread Pitch (Primary Bolt) | M8 x 1.25 |
Compatibility
This OEM genuine loose parts kit is engineered specifically for the ZF WG 171 transmission series. Based on the part type and fastener geometry, it is also compatible with the following ZF models that share the same valve body architecture: WG180, WG200, and WG150. Always verify the housing casting number before installation, as the TRANSMISSION HOUSING and HOUS.FRONT SECT must match the bolt pattern of this kit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656301066 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4656201015 | SCREEN SHEET | Filter screen for hydraulic fluid intake |
| 4656301037 | TUBE | Oil delivery tube between valve body and clutch |
| 0634313514 | O-RING | Seals the tube-to-housing connection |
| 0636100803 | CAP SCREW | Secures the rear housing cover |
| 4656301042 | HOUSING REAR PART | Rear section housing for output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing dowels |
| 0636100801 | CAP SCREW | Fastener for the oil pan rail |
| 0636100160 | CAP SCREW | Mounting bolt for the valve body |
Frequently Asked Questions
Q: Can I reuse the old bolts from the 4656.183.323 kit during a rebuild?
A: No. ZF specifies that all fasteners in this loose parts kit are single-use torque-to-yield. Reusing them risks thread galling and loss of clamp load, leading to internal oil leaks.
Q: Does this kit include the O-ring for the tube assembly?
A: Yes. The 4656.183.323 kit contains the necessary O-rings and seals to interface with the TUBE and O-RING connections. However, for complete assurance, we recommend ordering the separate O-ring (0634313514) if the original is heavily compressed.
Q: Will this part fit a ZF WG180 transmission built before 2010?
A: It is compatible with most WG180 units, but you must verify that the HOUS.FRONT SECT uses the same M8 bolt pattern. Early production models used M10 bolts; check your housing casting number.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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