Overview
This ZF 4657.033.012 3 WG 191 Powershift Transmission Assembly is a complete, factory-grade unit engineered for heavy-duty off-highway applications. Designed as a direct replacement for the WG 191 series, this assembly integrates the main drive components, clutch packs, and hydraulic control elements into a single, ready-to-install package. The SKU 4657.033.012 is the core power transfer module, sitting between the engine and the final drive, and it is commonly paired with the TRANSMISSION HOUSING to ensure structural integrity under extreme torque loads.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the internal clutch packs or valve body wear, the transmission may hesitate or fail to hold a gear, especially during uphill operation or heavy hauling.
- Hydraulic oil leaks around the bell housing: Deteriorated seals or a cracked HOUS.FRONT SECT can cause fluid loss, leading to low pressure and eventual transmission failure.
- Delayed or harsh shifting: Worn planetary gears or damaged bearings inside the assembly produce a noticeable clunk or delay when shifting between forward and reverse.
- Unusual whining or grinding noises: Metal debris from a failing HOUSING REAR PART can contaminate the oil, causing audible distress from the gear train.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.033.012 |
| Assembly Type | Complete Powershift Transmission |
| Series | WG 191 |
| Weight (approx.) | 185 kg (408 lbs) |
| Dimensions (L x W x H) | 620 x 480 x 420 mm |
| Housing Material | High-grade cast iron |
| OEM Reference | ZF 4657.033.012 |
| Torque Capacity | Up to 1,200 Nm |
| Fluid Capacity | 18 liters (approx.) |
Compatibility
This complete unit is engineered for the ZF WG 191 series, but it also serves as a direct replacement for select models in the WG 180 and WG 200 families. It is commonly found in telehandlers, wheel loaders, and industrial tractors. The assembly requires precise alignment with the CYLINDRICAL PIN to secure the housing sections during installation. Always verify your transmission model suffix before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657301130 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657301131 | HOUSING REAR PART | Rear section supporting output bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing sections |
| 0636102489 | CAP SCREW | Fastener for housing attachment |
| 4656301148 | FIXING PLATE | Secures internal clutch packs |
| 0636102463 | CAP SCREW | Bolt for rear housing |
| 4657201133 | SCREEN SHEET | Oil filter screen for hydraulic circuit |
| 0636115287 | CAP SCREW | Bolt for valve body cover |
| 4657301065 | PLATE | Wear plate for shift fork |
Frequently Asked Questions
Q: Can this assembly be installed without removing the entire drivetrain?
A: Yes, but it is recommended to replace the HOUS.FRONT SECT and HOUSING REAR PART simultaneously to prevent misalignment.
Q: What is the typical lifespan of this unit under normal operating conditions?
A: With proper maintenance and clean hydraulic fluid, the ZF 4657.033.012 can exceed 8,000 hours. Regular inspection of the CYLINDRICAL PIN is advised to avoid housing fatigue.
Q: Does this part include the torque converter?
A: No, this is the complete transmission assembly only. The torque converter must be ordered separately if needed.
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Phone: +86 158 2286 3467 |
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