Overview
The ZF 4656.054.078 4 WG 160 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control system into a single ready-to-install package. As a core component of the WG 160 series, it manages torque distribution across four forward and reverse speeds, ensuring smooth directional shifts under load. The SKU 4656.054.078 replaces worn or failed assemblies in wheel loaders, graders, and industrial tractors, restoring full driveline performance. This complete unit interfaces directly with the TRANSMISSION HOUSING to seal the internal oil circuits and support the rotating elements.
Symptoms of Failure
- Erratic gear engagement under load: When the assembly wears, operators experience delayed or harsh shifting, particularly when transitioning from forward to reverse. This is often accompanied by a momentary loss of tractive effort.
- Internal hydraulic pressure loss: Worn seals or scored clutch drums cause the transmission to slip during high-torque demands, leading to overheating and burnt oil odor.
- External oil seepage at mating flanges: Cracks in the assembly body or degraded gaskets allow ATF to weep from the joint between the main case and the HOUS.FRONT SECT, leaving visible drips on the bell housing.
- Unusual metallic grinding noises: Bearing failure within the assembly produces a rhythmic scraping sound that intensifies with engine RPM, indicating imminent internal damage.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4656.054.078 |
| Assembly Type | Complete Powershift Unit (4 WG 160) |
| Overall Length (approx.) | 620 mm |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Primary Material | High-tensile cast iron housing with hardened steel gears |
| OEM Reference | ZF 4656.054.078 (OEM direct) |
| Torque Capacity (estimated) | 1,600 Nm (1,180 lb-ft) |
| Fluid Capacity (assembly only) | 8.5 liters (2.25 gal) |
Compatibility
This complete assembly is engineered for the ZF WG 160 series transmissions. It is directly compatible with models including the WG 160, WG 161, and WG 162 used in 10–18 ton wheel loaders and telehandlers. The unit also fits select WG 180 variants when paired with the appropriate HOUSING REAR PART and HOUSING REAR PART adapters. Always verify your transmission model tag before ordering, as internal clutch configurations vary by application.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101031 | TRANSMISSION HOUSING | Main structural case enclosing gear train and valve body |
| 4656201075 | HOUS.FRONT SECT | Front section housing input shaft and torque converter interface |
| 4656201036 | HOUSING REAR PART | Rear cover supporting output shaft and PTO drive |
| 4472239179 | HOUSING REAR PART | Alternate rear housing variant for extended wheelbase models |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing-to-assembly mating |
| 4656301148 | FIXING PLATE | Retaining plate securing clutch piston springs |
| 0636100817 | CAP SCREW | M12 bolt for fastening housing sections together |
| 4656301016 | SCREEN SHEET | Fine mesh filter protecting hydraulic control valves |
| 4656301017 | SCREEN SHEET | Secondary filter screen for return oil circuit |
| 0636100803 | CAP SCREW | M10 bolt for securing filter screen and cover plate |
Frequently Asked Questions
Q: Can the 4656.054.078 assembly be rebuilt, or must it be replaced as a complete unit?
A: While internal clutch packs and seals are serviceable, the housing bores and valve body passages in this assembly are precision-machined. ZF recommends replacing the complete unit if the main housing shows scoring or if multiple clutches have failed, as individual component replacement often leads to recurrent leaks or shift quality issues.
Q: What is the typical service life of this powershift assembly in a wheel loader application?
A: Under normal operating conditions with proper fluid maintenance (ZF-approved ATF changed every 1,000 hours), the 4 WG 160 assembly typically lasts 8,000–12,000 hours. Harsh applications like rock handling or continuous reversing can reduce this interval by up to 40%.
Q: Does this assembly include the torque converter or is it sold separately?
A: The 4656.054.078 is the complete transmission assembly minus the torque converter. The converter is a separate component that bolts to the HOUS.FRONT SECT interface. We recommend ordering the converter simultaneously to ensure matched wear patterns.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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