Overview
The ZF 5838.129.001 BRAKE SHAFT is a critical internal component engineered for the WG100, WG130, and WG131 transmission series. This genuine OEM part functions as the primary actuation shaft within the brake assembly, transferring mechanical force from the external brake lever to the internal clutch pack or brake band. Positioned within the transmission’s valve body and clutch housing interface, the brake shaft ensures precise engagement and disengagement of the parking or service brake system. The SKU 5838.129.001 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit and reliable performance in heavy-duty industrial drivetrains.
Symptoms of Failure
- Brake drag or incomplete release: A worn brake shaft can cause the brake to remain partially engaged, leading to overheating and reduced fuel efficiency. This is often noticed as a persistent “brake dragging” sensation during operation.
- Transmission oil leaks at the brake actuator: When the shaft seal surface becomes scored or pitted, transmission fluid can seep past the O-ring, resulting in visible drips or wet spots near the brake housing.
- Intermittent gear slipping under load: A fractured or bent brake shaft may fail to hold the brake pack securely, causing the transmission to slip out of gear when torque is applied, especially during uphill climbs or heavy hauling.
- Unusual clicking or grinding noises: Excessive play in the brake shaft splines or bearing surfaces produces metallic sounds during brake application, indicating imminent component failure.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 5838.129.001 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 185 mm (approx.) |
| Shaft Diameter (bearing journal) | 28 mm |
| Spline Count | 14 involute splines |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 5838.129.001 |
| Surface Treatment | Black oxide corrosion resistant |
Compatibility
This brake shaft is specifically designed for ZF’s WG series powershift transmissions. It is a direct replacement for models WG100, WG130, and WG131. While primarily intended for these three variants, it may also be compatible with select WG180 and WG200 configurations that share the same brake actuator architecture. Always verify the spline count and shaft length against your existing part before installation. For complete drivetrain integrity, this shaft works in concert with the 5838109009: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING to manage axial loads. The 2093209023: DIFFERENTIAL and 5838300626: DIFFERENTIAL HOUSING are also frequently replaced during a full brake shaft overhaul.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109009 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial shaft loads |
| 2093209023 | DIFFERENTIAL | Secondary differential for planetary gears |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gear set |
| 0631329088 | SPRING PIN | Secures brake shaft to actuator lever |
| 5838300811 | THRUST WASHER | Reduces axial friction on shaft shoulder |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Connects differential to wheel hubs |
| 5838300753 | THRUST WASHER | Spacer for differential side gears |
| 5838300818 | THRUST WASHER | Axial load bearing for output shaft |
Frequently Asked Questions
Q: Can I use the ZF 5838.129.001 brake shaft in a WG180 transmission?
A: While the WG180 shares a similar brake architecture, we recommend measuring the shaft length and spline count. The 5838.129.001 is optimized for WG100/WG130/WG131; using it in a WG180 may require verifying compatibility with your specific housing and actuator arm.
Q: What other parts should I replace when installing a new brake shaft?
A: It is prudent to inspect and replace the 0631329088: SPRING PIN and all associated 5838300811: THRUST WASHER components, as these wear simultaneously. The 0750117075: TAPER ROLLER BEARING should also be replaced to prevent premature shaft failure.
Q: How do I confirm the brake shaft is the source of an oil leak?
A: Clean the brake actuator area thoroughly, then run the transmission. If oil appears at the shaft seal bore (not the housing gasket), the brake shaft’s sealing surface is likely worn. Replacement with the 5838.129.001 will restore the seal interface.
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ZF 5838.129.001 BRAKE SHAFT – Shaft RFQ Support
PartsZF helps B2B buyers source ZF 5838.129.001 BRAKE 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 5838.129.001 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: BRAKE SHAFT
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 | 5838.129.001 |
|---|---|
| Normalized SKU | 5838129001 |
| Part name | BRAKE SHAFT |
| Product category | shaft |
| Cross-reference support | Available for RFQ review |
Image and Documentation Notes
Current product media status: fallback. 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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