Overview
The ZF 4657.185.078 ACCESSORIES component is a critical interface element within the WG210 series transmission assembly. Designed as an OEM genuine part, this accessory serves as a mounting and alignment fixture that secures internal hydraulic circuits and sensor pathways. Positioned between the main valve body and the intermediate plate, the 4657.185.078 ensures precise fluid distribution during gear shifts. The SKU 4657.185.078 is engineered to ZF’s exacting tolerances, reducing vibration and preventing cross-threading in high-torque applications. When paired with the 4657101082: TRANSMISSION HOUSING, this accessory maintains structural integrity under extreme thermal loads.
Symptoms of Failure
- Intermittent gear hunting under load: A worn 4657.185.078 can cause erratic pressure drops, leading to delayed engagement when climbing grades or towing.
- Fluid seepage at the bell housing seam: Degraded sealing surfaces allow ATF to weep past the 4657201166: HOUS.FRONT SECT, leaving visible drips after shutdown.
- Harsh 2-3 upshifts: Misalignment from a fatigued accessory creates uneven clutch pack application, producing a pronounced jolt during acceleration.
- Whining noise in neutral: Loose fitment allows the 4657201170: HOUSING REAR PART to resonate, generating a high-pitched sound that worsens with temperature.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.185.078 |
| Material | Aluminum alloy (EN AC-44300) |
| Weight | 0.42 kg (0.93 lbs) |
| Overall Length | 118 mm |
| Bolt Hole Pattern | 6x M8 on 85 mm PCD |
| Sealing Surface Hardness | HRB 75-85 |
| Operating Temperature Range | -40°C to +150°C |
| Torque Specification | 22 Nm (16 ft-lbs) |
Compatibility
This accessory is primarily designed for the ZF WG210 series, but cross-referencing indicates fitment with WG180, WG200, and WG250 models using the same bolt pattern. It integrates directly with the 4657298102: HOUSING REAR SECTION to complete the rear seal assembly. For WG310 variants, verify the pilot bore diameter before installation. The 4657.185.078 is not compatible with pre-2005 WG160 units due to differing dowel pin locations.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing torque converter |
| 4657201170 | HOUSING REAR PART | Rear cover for output shaft |
| 4657298102 | HOUSING REAR SECTION | Extended rear housing for PTO mounts |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M8x25 flange bolt for accessory |
| 4656301148 | FIXING PLATE | Retainer for oil filter bracket |
| 4657301032 | SCREEN SHEET | Fine mesh filter for valve body |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M10x30 bolt for rear housing |
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