Overview
The ZF 4656.183.226 LOOSE PARTS kit is a critical OEM genuine service set designed specifically for the WG 160 Series transmission. This assembly group contains the internal fasteners, locating pins, and small hardware components that secure the main housing sections together. Without these loose parts, the transmission’s structural integrity is compromised, leading to misalignment of the gear train and potential oil migration between chambers. The SKU 4656.183.226 is the exact factory-specified kit for replacing worn or damaged hardware during a rebuild or overhaul of the WG160. It works in concert with the 4656101056: TRANSMISSION HOUSING to ensure a leak-free, vibration-resistant assembly.
Symptoms of Failure
When the 4656.183.226 LOOSE PARTS kit components degrade, operators will notice distinct failure modes. Look for these specific symptoms to identify a failing hardware set:
- Oil weeping from housing mating surfaces – Worn or missing fasteners allow the 4656201075: HOUS.FRONT SECT to separate from the main case, creating a slow drip of ATF fluid.
- Intermittent gear slippage under load – Loose locating pins cause the 4656201077: HOUSING REAR PART to shift, altering clutch pack clearances and resulting in delayed engagement.
- Abnormal vibration during shifts – When the 4656298049: HOUSING REAR SECTION is not properly torqued due to degraded loose parts, driveline harmonics increase noticeably.
- Metal debris in the oil pan – Sheared cap screws or fractured pins from this kit contaminate the hydraulic circuit, accelerating wear on valve bodies.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4656.183.226 |
| OEM Reference | ZF WG160 Series |
| Kit Contents | Cap screws, cylindrical pins, fixing plates, screen sheets |
| Material | Case-hardened steel (fasteners), stainless steel (screens) |
| Weight (approx.) | 0.85 kg (1.87 lbs) |
| Thread Pitch (primary) | M10 x 1.5 (cap screws) |
| Torque Specification | 45 Nm ± 3 Nm (dry) |
Compatibility
This LOOSE PARTS kit is engineered for the WG 160 transmission family. It is also compatible with the WG 180 and WG 200 series when used in conjunction with the correct housing variants. The kit fits all WG160 sub-models including the WG160-6, WG160-8, and WG160-10. For applications using the WG 120 or WG 250, verify housing bolt patterns before installation, as the pin diameters differ. Always pair this kit with a new TRANSMISSION HOUSING to guarantee proper alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural case for gear and clutch assembly |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft support |
| 4656201077 | HOUSING REAR PART | Rear housing segment for output bearing retention |
| 4656298049 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing registration |
| 4656301148 | FIXING PLATE | Locking plate for fastener retention |
| 0636100817 | CAP SCREW | M10 bolt for housing joint clamping |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil return passage |
| 4656301017 | SCREEN SHEET | Coarse mesh filter for sump protection |
| 0636100803 | CAP SCREW | M8 bolt for accessory bracket mounting |
