Overview
The ZF 4657.174.048 CLUTCH is a critical friction assembly engineered for the WG 190 and WG 210 series powershift transmissions. This OEM genuine part, identified by SKU 4657.174.048, sits within the planetary gear set and is responsible for engaging and disengaging specific gear ratios. When hydraulic pressure is applied, this clutch pack locks the rotating elements to transfer torque smoothly from the engine to the driveline. It is housed securely within the TRANSMISSION HOUSING, which provides the structural integrity needed for high-load industrial applications.
Symptoms of Failure
- Delayed or harsh gear engagement: When the clutch pack wears thin, you may notice a lag between shifting and actual engagement, or a jarring “clunk” as the transmission catches.
- Gear slipping under load: A worn 4657.174.048 clutch often causes the transmission to slip out of gear when climbing grades or hauling heavy payloads, leading to a loss of power.
- Low hydraulic pressure warnings: Internal leakage past the clutch seals can trigger pressure drop alerts on the dash, indicating the clutch is no longer holding properly.
- Burnt transmission fluid odor: Excessive heat from clutch slippage will degrade the ATF, producing a distinct burnt smell and dark, gritty fluid.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.174.048 |
| Type | Multi-disc Clutch Pack |
| Outer Diameter | 174 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Friction Material | Sintered Bronze / Paper Composite |
| Weight | 1.8 kg (approx.) |
| OEM Reference | ZF 4657.174.048 |
| Torque Capacity | Up to 2,100 Nm (estimated) |
Compatibility
This clutch is specifically designed for the ZF WG 191 and WG 211 series transmissions. It is a direct replacement for units in the WG 180, WG 190, WG 200, and WG 210 families where the clutch pack diameter matches 174 mm. Always verify the number of friction discs and steel plates in your existing pack before ordering. The clutch interfaces directly with the HOUS.FRONT SECT and the HOUSING REAR PART, which together form the clutch drum cavity. A CYLINDRICAL PIN is used to align the clutch hub during reassembly, ensuring proper indexing of the splines.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing that encloses the clutch assembly |
| 4657301130 | HOUS.FRONT SECT | Front section of the clutch drum housing |
| 4657301131 | HOUSING REAR PART | Rear section of the clutch drum housing |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for clutch hub positioning |
| 0636102489 | CAP SCREW | Fastener for securing the clutch cover |
| 4656301148 | FIXING PLATE | Retaining plate for clutch pack stack |
| 0636102463 | CAP SCREW | Bolt for fixing the housing sections |
| 4657201133 | SCREEN SHEET | Filter screen protecting the clutch oil circuit |
| 0636115287 | CAP SCREW | High-tensile bolt for clutch drum assembly |
| 4657301065 | PLATE | Steel separator plate for clutch pack |
Frequently Asked Questions
Q: Can I install the 4657.174.048 clutch without replacing the steel plates?
A: It is strongly recommended to replace both friction discs and steel separator plates simultaneously. Worn steel plates can have glazed surfaces or heat spots that will quickly damage a new clutch pack.
Q: How do I know if my WG 191 transmission uses this exact clutch?
A: Measure the outer diameter of your existing clutch pack. If it measures 174 mm and has 5 friction discs, the 4657.174.048 is the correct OEM replacement. Cross-reference your serial number with ZF documentation for absolute certainty.
Q: What torque specification should I use for the cap screws when reassembling?
A: For the CAP SCREW (0636102489) and CAP SCREW (0636102463), apply 45 Nm of torque in a crisscross pattern. Always use a calibrated torque wrench to avoid distorting the housing.
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Phone: +86 158 2286 3467 |
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