Overview
The ZF 4657.375.021 SHAFT is a critical torque-transmitting component engineered specifically for the WG191 and WG211 series transmissions. Positioned within the planetary gearset assembly, this OEM genuine shaft ensures precise alignment of clutch packs and rotating elements, directly influencing shift quality and power delivery. The SKU 4657.375.021 is manufactured to ZF’s original tolerances, guaranteeing a direct fit and long service life in heavy-duty industrial applications.
Symptoms of Failure
- Delayed or harsh shifting under load — When the shaft wears at its spline interface, gear engagement becomes erratic, often described as “clunking” during acceleration.
- Transmission oil leaks near the bell housing — A worn shaft seal surface allows ATF to escape, leaving visible drips and reducing hydraulic pressure.
- Vibration or whining noise in neutral — Bearing journals on the 4657.375.021 shaft can develop scoring, producing a cyclical noise that intensifies with RPM.
- Intermittent gear slipping in higher ranges — Loss of axial retention from shaft wear causes clutch packs to partially disengage, leading to power loss under torque.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.375.021 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 312 mm (estimated) |
| Shaft Diameter (bearing journal) | 38 mm |
| Spline Count | 24 involute splines |
| Weight | 2.85 kg (approx.) |
| Surface Treatment | Black oxide + phosphate coating |
| OEM Reference | ZF 4657.375.021 |
Compatibility
This shaft is designed for the ZF WG191 and WG211 series transmissions, which are widely used in municipal trucks, fire apparatus, and off-highway equipment. It also fits select variants of the WG180 and WG200 series where the planetary carrier assembly shares the same spline geometry. Always verify the transmission serial number against the 4657.375.021 part number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | PRESSURE REGULATOR | Controls main line pressure to clutch packs |
| 0501211384 | VALVE | Directs hydraulic flow for shift timing |
| 0630532183 | INDENTED RING | Secures shaft axial position within housing |
| 4656306145 | PISTON | Applies clamping force to clutch discs |
| 0732042767 | COMPRESSION SPRING | Returns piston to neutral position |
| 0631612064 | SET SCREW | Locks valve body alignment |
| 0631610026 | SET SCREW | Secures shift rail position |
| 4657101049 | TRANSMISSION HOUSING | Encloses all rotating assemblies |
| 4657301130 | HOUS.FRONT SECT | Front section of main casing |
| 4657301131 | HOUSING REAR PART | Rear section supporting output shaft |
Frequently Asked Questions
Q: Can I install the 4657.375.021 shaft without replacing the INDENTED RING?
A: It is strongly recommended to replace the indented ring simultaneously. The ring locks the shaft axially; reusing a worn ring can lead to end-play and eventual shaft damage.
Q: How do I confirm this shaft fits my WG211 transmission?
A: Check the transmission data plate for the model code. The 4657.375.021 is standard in WG211 units built after 2012. If your unit has a different planetary carrier, verify spline count matches 24 involute teeth.
Q: What other parts commonly fail alongside this shaft?
A: The PISTON and PRESSURE REGULATOR often show wear from debris generated by a failing shaft. Inspect both during rebuild.
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ZF 4657.375.021 SHAFT – Shaft RFQ Support
PartsZF helps B2B buyers source ZF 4657.375.021 SHAFT with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This shaft page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 4657.375.021 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Documentation reference: 4657033001
- Documentation reference: 4657033002
- Documentation reference: 4657033003
- Documentation reference: 4657033005
- Illustration section: COUPLING
- Illustration section: CLUTCH
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4657.375.021 |
|---|---|
| Normalized SKU | 4657375021 |
| Part name | SHAFT |
| Product category | shaft |
| Cross-reference support | Available for RFQ review |
| Weight | 12.2 |
Image and Documentation Notes
Current product media status: diagram. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
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- ZF 4646.303.100 INPUT SHAFT
- ZF 4657.303.043 OUTPUT SHAFT
