Overview
This OEM genuine ZF 4656.056.018 component is a critical internal sealing and alignment element designed specifically for the WG 160 Series transmission. Positioned within the rear section of the gearbox housing, this part ensures proper oil flow regulation and prevents cross-contamination between hydraulic circuits. The SKU 4656.056.018 interfaces directly with the main shaft assembly to maintain consistent pressure during load shifts. When installed alongside a properly torqued HOUS.FRONT SECT, this part guarantees precise alignment of the planetary gear set.
Symptoms of Failure
- Intermittent gear slippage under load — A worn 4656.056.018 allows hydraulic pressure to bleed past seals, causing delayed engagement in 3rd and 4th gears.
- Oil seepage near the rear housing joint — Deterioration of this part leads to visible fluid trails around the HOUSING REAR PART interface.
- Erratic shift timing — When this component fails, the transmission may hold gears too long or skip shifts entirely due to disrupted oil gallery routing.
- Metallic debris in transmission pan — Advanced wear of the 4656.056.018 can shed polymer particles that contaminate the SCREEN SHEET filter element.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.056.018 |
| Material | Hardened steel with nitrile sealing lip |
| Outer Diameter | 68.5 mm |
| Inner Diameter | 42.0 mm |
| Thickness | 12.8 mm |
| Weight | 0.185 kg |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 4656.056.018 (Genuine) |
Compatibility
This genuine ZF 4656.056.018 is engineered for the WG 160 Series but also fits select variants of the WG 180 and WG 200 transmissions when used with the correct TRANSMISSION HOUSING. It is compatible with all WG 160 models produced after 2012, including the WG160-6 and WG160-8 configurations. For WG 180 applications, verify that the HOUSING REAR PART (4472239178) is present to ensure proper fitment. This part is not recommended for pre-2008 WG 120 units without adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4656201035 | HOUSING REAR PART | Rear housing section for output shaft |
| 4472239178 | HOUSING REAR PART | Alternate rear housing for WG180 |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 4656301148 | FIXING PLATE | Retains bearing in position |
| 0636100817 | CAP SCREW | M10 fastener for housing bolts |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil pickup |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M8 fastener for cover plate |
Frequently Asked Questions
Q: Can I install the 4656.056.018 without replacing the adjacent seals?
A: It is strongly recommended to replace all sealing elements in the rear housing section simultaneously. A worn HOUSING REAR PART gasket can compromise the new part’s performance within 500 operating hours.
Q: How do I verify this part fits my WG160 transmission?
A: Check the stamped serial number on the TRANSMISSION HOUSING. If the prefix is “WG160-” followed by a six-digit code, the 4656.056.018 is compatible. For units with a “WG180-” prefix, confirm the presence of the 4472239178 rear housing variant.
Q: What torque specification applies to the retaining bolts for this part?
A: Use 45 Nm for the M8 cap screws (part 0636100803) and 85 Nm for the M10 fasteners (part 0636100817) when securing the assembly to the HOUS.FRONT SECT.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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