Overview
The ZF 4656.337.009 COVER is a critical sealing and protective component engineered for the WG 130 and WG 160 transmission series. This OEM genuine part sits at the rear or intermediate section of the transmission housing, serving as a barrier against contamination and a structural anchor for internal pressure regulation. Designed to withstand high thermal loads and vibration, the SKU 4656.337.009 ensures that hydraulic circuits remain isolated and that the gear train operates without debris ingress. When installed alongside the TRANSMISSION HOUSING (4657101042), this cover completes the sealed envelope essential for consistent oil flow and torque transfer.
Symptoms of Failure
- Persistent oil seepage around the transmission bell housing: A worn or cracked 4656.337.009 cover often leads to slow, progressive leaks that stain the undercarriage and reduce fluid levels.
- Gear engagement hesitation or slipping under load: When the cover loses its seal, hydraulic pressure drops, causing delayed shifts or momentary loss of drive in WG 130/WG 160 units.
- Metallic rattling or vibration at idle: A loose or distorted cover can contact rotating assemblies, producing a distinct noise that worsens as the transmission warms up.
- Contaminated transmission fluid (dark or gritty): Cracks in the cover allow external dirt to mix with the oil, accelerating wear on bearings and clutches.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4656.337.009 |
| Material | Die-cast aluminum alloy (A380 equivalent) |
| Overall Dimensions (L x W x H) | 245 mm x 180 mm x 55 mm |
| Weight | 1.42 kg (3.13 lbs) |
| OEM Reference | ZF 4656.337.009 |
| Surface Finish | Anodized with sealing gasket groove |
| Bolt Pattern | 6 x M10 threaded holes (120 mm PCD) |
Compatibility
This cover is primarily designed for the ZF WG 130 and WG 160 series transmissions. It is also compatible with the WG 180 and WG 200 models when used in conjunction with the correct HOUS.FRONT SECT (4657201028) and HOUSING REAR PART (4657201013). For proper alignment during installation, always use the CYLINDRICAL PIN (0631306792) to locate the cover precisely against the main housing. This part is not intended for WG 210 series without adapter plates, though it shares the same bolt pattern as earlier WG variants.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101042 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201028 | HOUS.FRONT SECT | Front section housing for input shaft support |
| 4657201013 | HOUSING REAR PART | Rear housing segment for output bearing retention |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for precise cover positioning |
| 0636100801 | CAP SCREW | M10 fastener for cover attachment |
| 4656301148 | FIXING PLATE | Locking plate to prevent screw loosening |
| 4657301034 | SCREEN SHEET | Fine mesh filter for oil intake protection |
| 4657301035 | SCREEN SHEET | Coarse mesh pre-filter for debris exclusion |
| 0636100803 | CAP SCREW | M8 fastener for auxiliary bracket mounting |
| 4656301048 | OIL FEED.HOUSG. | Oil supply channel housing for lubrication circuit |
