Overview
The ZF 5838.300.399 SPACER TUBE is a precision-machined component engineered to maintain critical axial clearances within the differential and axle assembly of heavy-duty construction machinery transmissions. Positioned between the differential housing and the taper roller bearing, this OEM genuine spacer tube ensures correct preload on the bearing set, directly influencing gear mesh accuracy and load distribution. The SKU 5838.300.399 is specifically designed to prevent metal-to-metal contact between rotating and stationary parts, thereby extending the service life of the entire drivetrain. When installed alongside the 5838022003: REAR AXLE and the 5838109001: DIFFERENTIAL, this spacer tube forms a sealed, high-tolerance assembly that withstands extreme torque loads in wheel loaders and graders.
Symptoms of Failure
- Excessive drivetrain backlash or gear clunking — A worn spacer tube allows the 0750117075: TAPER ROLLER BEARING to shift, creating audible play during direction changes.
- Oil seepage from the differential housing seal area — Loss of axial preload causes the bearing to wobble, breaking the seal lip and leading to lubricant leaks.
- Premature bearing failure or brinelling — Incorrect spacing accelerates fatigue on the taper roller bearing raceways, producing metallic debris in the oil.
- Vibration under load at low speeds — Misalignment from a collapsed spacer tube transfers harmonic vibrations through the 5838300128: DIFFERENTIAL HOUSING, felt as a low-frequency shudder.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 5838.300.399 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outer Diameter | 85.0 mm |
| Inner Diameter | 70.0 mm |
| Length | 38.5 mm |
| Weight | 0.42 kg |
| Surface Hardness | 58-62 HRC |
| OEM Reference | ZF 5838.300.399 |
| Thread Pitch | N/A (smooth bore) |
Compatibility
This spacer tube is a direct fit for ZF WG180, WG200, and WG310 series powershift transmissions commonly used in construction machinery such as wheel loaders, dozers, and articulated dump trucks. It also integrates with the ZF AP400 and AP500 axle series. For proper assembly, always pair this part with the 0631329086: SPRING PIN to secure the spacer in the differential housing bore. Verify axle model compatibility before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838022003 | REAR AXLE | Transmits torque to wheels; houses differential assembly |
| 5838109001 | DIFFERENTIAL | Distributes power between left and right wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on the axle shaft |
| 5838300128 | DIFFERENTIAL HOUSING | Encloses differential gears and spacer tube |
| 0631329086 | SPRING PIN | Locks spacer tube in position within housing |
| 5838300129 | THRUST WASHER | Reduces friction between bevel gear and housing |
| 5838300130 | THRUST WASHER | Secondary axial clearance control |
| 5838300131 | AXLE BEVEL GEAR | Changes torque direction 90 degrees |
| 5838300132 | COMPENS. STUB AXLE | Connects differential to wheel hub |
| 5838300133 | COMPENS. STUB AXLE | Opposite-side stub axle for balanced load |
