Overview
The ZF 5838.300.734 REAR AXLE HOUS. is a critical structural component within the final drive assembly of heavy-duty construction machinery. This OEM genuine part encases the differential and axle shafts, providing the rigid support necessary to transfer torque from the transmission to the wheels. As the primary load-bearing shell, it maintains precise gear alignment under extreme stress. The SKU 5838.300.734 is engineered to ZF’s exacting metallurgical standards, ensuring long-term durability in excavators, wheel loaders, and graders. When installed, it works in concert with the 5838109009: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING to manage radial and axial loads.
Symptoms of Failure
- Visible oil seepage at axle housing seals: Cracks or porosity in the housing casting allow gear oil to escape, leading to low lubricant levels and eventual gear damage.
- Persistent whining or grinding from the rear axle: A warped or cracked housing misaligns the 2093209023: DIFFERENTIAL, causing metal-on-metal contact during operation.
- Vibration under load during turning: Structural fatigue in the housing allows the 5838300626: DIFFERENTIAL HOUSING to flex, creating uneven tire wear and driveline shudder.
- Bearing bore elongation: Repeated stress cycles enlarge the mounting points for the taper roller bearing, resulting in loose fits and premature bearing failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 5838.300.734 |
| Material | High-tensile nodular cast iron (GGG-50) |
| Dry Weight | 38.5 kg (84.9 lbs) |
| Overall Length | 620 mm |
| Flange Bolt Pattern | 12 x M16 on 180 mm PCD |
| OEM Reference | ZF 5838.300.734 |
| Max Operating Torque | 12,000 Nm |
Compatibility
This rear axle housing is specifically designed for ZF’s WG series powershift transmissions used in construction machinery. It is a direct fit for the WG180, WG200, and WG250 models. The housing also integrates with the AP400 and AP500 axle series found in telescopic handlers and backhoe loaders. Always verify the axle ratio and differential carrier size before installation, as the 5838109009: DIFFERENTIAL must match the housing’s internal cavity dimensions.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109009 | DIFFERENTIAL | Distributes torque between left and right wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports differential carrier and absorbs thrust loads |
| 2093209023 | DIFFERENTIAL | Alternative differential assembly for higher ratios |
| 5838300626 | DIFFERENTIAL HOUSING | Inner carrier that holds the differential gears |
| 0631329088 | SPRING PIN | Secures differential pinion shaft alignment |
| 5838300811 | THRUST WASHER | Reduces axial friction between side gears and housing |
| 5838300721 | AXLE BEVEL GEAR | Transfers power from differential to axle shafts |
| 5838300633 | AXLE | Driveshaft connecting differential to wheel hub |
| 5838300753 | THRUST WASHER | Spacer for differential gear backlash adjustment |
| 5838300818 | THRUST WASHER | High-load washer for planetary gear sets |
Frequently Asked Questions
Q: Can the 5838.300.734 housing be repaired if cracked?
A: Welding is not recommended due to the nodular iron’s heat-affected zone. Replacement with this OEM genuine part is the only reliable solution to maintain structural integrity.
Q: Does this housing include the differential carrier?
A: No. The housing is supplied as a bare casting. You must transfer your existing 5838300626: DIFFERENTIAL HOUSING and internal components.
Q: What is the typical service life of this part?
A: Under normal construction conditions, the housing lasts 8,000–12,000 hours. Failure often accelerates if the 0750117075: TAPER ROLLER BEARING wears and introduces vibration.
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