Overview
The ZF 4656.183.301 LOOSE PARTS kit is a critical service component designed specifically for the WG 160 series transmission. This genuine OEM assembly contains the essential fasteners, seals, and positioning elements required to secure internal components during a rebuild or major repair. The SKU 4656.183.301 is typically installed within the main gear housing, acting as the retention system for the planetary carrier and clutch packs. Without this specific loose parts set, the transmission cannot maintain proper gear alignment or hydraulic pressure integrity. It is often replaced in conjunction with the TRANSMISSION HOUSING to ensure all mating surfaces are correctly torqued.
Symptoms of Failure
- Oil leaks at the housing seam: When the 4656.183.301 loose parts wear or loosen, hydraulic fluid can seep between the HOUS.FRONT SECT and the main casing, leading to visible drips under the vehicle.
- Gear slipping under load: Worn retention components cause the clutch packs to shift out of tolerance, resulting in intermittent power loss during acceleration or hill climbs.
- Abnormal vibration or rattle: Loose fasteners within the assembly create a distinct metallic noise, particularly when the transmission is in neutral or coasting.
- Delayed engagement: A failing loose parts set can prevent the valve body from achieving correct hydraulic pressure, causing a 2-3 second lag when shifting from Park to Drive.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.183.301 |
| Material Composition | Case-hardened steel / Nitrile seals |
| Weight (approx.) | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 120 mm x 80 mm x 35 mm |
| OEM Reference | ZF WG 160 Series |
| Torque Specification | 45 Nm (33 ft-lbs) for cap screws |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF 4656.183.301 loose parts kit is engineered for the WG 160 transmission family. It is directly compatible with the WG 160, WG 180, and WG 200 models, as these share the same housing architecture and bolt pattern. The kit also fits select WG 150 variants when used with the HOUSING REAR PART adapter. For applications involving the HOUSING REAR SECTION, verify the serial number prefix to ensure correct fitment. This part is not backward-compatible with WG 120 or earlier series without significant modification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101055 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4656201076 | HOUSING REAR PART | Rear housing section for output shaft |
| 4656298047 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing dowels |
| 4656301148 | FIXING PLATE | Retention plate for clutch pack |
| 0636100817 | CAP SCREW | M10 x 30 hex bolt for housing |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M8 x 20 hex bolt for cover |
Frequently Asked Questions
Q: Can the 4656.183.301 loose parts be reused after a transmission rebuild?
A: ZF recommends replacing all loose parts in this kit with new OEM components during any major overhaul. The fasteners are torque-to-yield and may lose clamping force after initial installation.
Q: Does this kit include the cap screws for the housing?
A: Yes, the 4656.183.301 set includes the necessary cap screws and cylindrical pins. For additional fasteners, refer to the CAP SCREW or CYLINDRICAL PIN listings separately.
Q: What is the difference between the two SCREEN SHEET parts listed?
A: Part 4656301016 is a fine mesh screen for the main oil gallery, while 4656301017 is a coarser pre-filter for the sump pickup. Both should be replaced simultaneously.
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Phone: +86 158 2286 3467 |
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