Overview
The ZF 4656.183.037 is a precision-engineered OEM genuine component designed specifically for the WG 160 Series transmission. This part functions as a critical sealing and alignment element within the hydraulic control circuit, ensuring consistent oil pressure regulation and smooth gear engagement. As an integral part of the valve body assembly, the SKU 4656.183.037 works in concert with the TRANSMISSION HOUSING to maintain structural integrity under high torque loads. When installed alongside the HOUS.FRONT SECT, this part ensures proper fluid channeling between the pump and clutch packs.
Symptoms of Failure
- Delayed engagement or gear slipping under load: When the 4656.183.037 wears, internal leakage causes pressure drops, leading to hesitation when shifting from neutral to drive or reverse.
- Transmission fluid seepage near the valve body area: A worn sealing surface allows ATF to escape, often visible as drips around the bell housing or pan gasket.
- Erratic shift patterns or harsh upshifts: Inconsistent hydraulic pressure from a degraded part triggers abrupt gear changes, particularly in the 2-3 shift range.
- Overheating during prolonged operation: Reduced fluid flow due to internal bypassing forces the transmission to run hotter than normal, accelerating wear on clutches and bands.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.183.037 |
| Material | Hardened steel with nitrile sealing layer |
| Weight | 0.42 kg (0.93 lbs) |
| Outer Diameter | 58.2 mm |
| Inner Diameter | 32.0 mm |
| Height | 18.5 mm |
| Operating Temperature Range | -40°C to +150°C |
| OEM Reference | ZF 4656.183.037 (Genuine) |
Compatibility
This OEM genuine part is primarily engineered for the ZF WG 160 Series transmission. It is also compatible with the WG 180 and WG 200 models due to shared hydraulic architecture. The 4656.183.037 interfaces directly with the HOUSING REAR PART and the HOUSING REAR PART (variant), making it suitable for rebuilds of WG series units used in municipal buses, fire trucks, and heavy-duty off-road equipment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing torque converter |
| 4656201035 | HOUSING REAR PART | Rear housing supporting output shaft |
| 4472239178 | HOUSING REAR PART | Alternate rear housing for WG variants |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 4656301148 | FIXING PLATE | Secures valve body to housing |
| 0636100817 | CAP SCREW | M10 bolt for housing fastening |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M8 bolt for cover plate |
Frequently Asked Questions
Q: Can the 4656.183.037 be replaced without removing the transmission?
Yes, in most WG 160 applications, this part is accessible after dropping the transmission pan and removing the valve body. However, we recommend inspecting the FIXING PLATE and SCREEN SHEET simultaneously to prevent future failures.
Q: How does this part differ from the 4656.183.038 variant?
The 4656.183.037 features a nitrile sealing layer optimized for Dexron III fluids, while the .038 variant uses Viton for synthetic oils. Always verify your transmission fluid type before ordering.
Q: What torque specification applies to the CAP SCREW securing this part?
ZF recommends 25 Nm (18.4 ft-lbs) for the M10 cap screws and 18 Nm (13.3 ft-lbs) for the M8 variant (0636100803) when used in the same assembly.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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