Overview
The ZF 4656.183.128 LOOSE PARTS set is a critical service kit designed specifically for the WG 160 series transmission. This assembly contains the internal fasteners, locating pins, and retention hardware required to secure the main transmission housing sections together. As an OEM genuine part, SKU 4656.183.128 ensures that the clamping force and alignment between the TRANSMISSION HOUSING, the HOUS.FRONT SECT, and the HOUSING REAR PART remain within factory tolerances. Without this specific loose parts kit, the structural integrity of the gearbox is compromised, leading to misalignment of planetary gear sets.
Symptoms of Failure
When the 4656.183.128 loose parts begin to fatigue or are missing during a rebuild, operators will notice distinct failure modes. The most common symptom is external oil seepage at the mating flanges between the front and rear housing sections. A second indicator is abnormal gear whine or vibration during load shifts, caused by the housing halves shifting under torque. Third, you may experience intermittent loss of hydraulic pressure as the bolt tension relaxes, allowing internal seals to leak. Finally, difficulty engaging reverse or low gear often points to a loose housing interface that distorts the valve body alignment.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4656.183.128 |
| Material Composition | Steel (fasteners) / Zinc-plated alloy (retainers) |
| Total Weight | 0.85 kg (1.87 lbs) |
| Thread Pitch (Primary Bolts) | M10 x 1.5 |
| Hardness Rating | 10.9 Grade (fasteners) |
| OEM Reference | ZF 4656.183.128 |
Compatibility
While the 4656.183.128 is primarily cataloged for the WG 160 Series, this loose parts kit is also compatible with the WG 180 and WG 200 transmissions that share the same housing architecture. It is essential to verify the specific housing variant, as the HOUSING REAR PART (4472239179) may require a different fastener length. Always cross-reference your transmission serial number with the ZF parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101031 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4656201075 | HOUS.FRONT SECT | Front section of the transmission housing |
| 4656201036 | HOUSING REAR PART | Rear housing section for output shaft support |
| 4472239179 | HOUSING REAR PART | Alternate rear housing variant for WG160 |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Retains bearing preload within the housing |
| 0636100817 | CAP SCREW | M10 bolt for housing flange clamping |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil sump pickup |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for hydraulic circuit |
| 0636100803 | CAP SCREW | M8 bolt for accessory bracket mounting |
Frequently Asked Questions
Q: Can I reuse the old bolts from my WG160 instead of buying the 4656.183.128 kit?
A: No. ZF specifies that all fasteners in the loose parts kit are single-use torque-to-yield bolts. Reusing them risks bolt stretch and sudden housing separation under load.
Q: Does this kit include the cylindrical pin (0631306816)?
A: The 4656.183.128 kit contains the primary fasteners and locking plates, but the alignment dowel (0631306816) is a separate line item. We recommend ordering it simultaneously to ensure perfect housing alignment.
Q: How do I verify if my transmission needs the 4656201036 or 4472239179 rear housing?
A: Check the casting number on the rear face of your transmission. The 4472239179 variant has an additional oil gallery port for PTO applications, while the 4656201036 is the standard closed-face design.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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