Overview
The ZF 5838.300.129 Thrust Washer is a precision-engineered OEM genuine component designed to manage axial loads and maintain critical clearances within heavy-duty ZF transmission assemblies. Positioned between rotating gears and stationary housings, this washer absorbs end-play forces to prevent metal-on-metal contact. Commonly found in construction machinery drivelines, the SKU 5838.300.129 ensures that gear alignment remains stable under high-torque conditions. When paired with a properly functioning 5838022003: REAR AXLE and 5838109001: DIFFERENTIAL, this thrust washer plays a vital role in extending overall transmission service life.
Symptoms of Failure
When the ZF 5838.300.129 thrust washer wears beyond specification, operators may notice distinct performance issues. Transmission gear slipping under load often occurs as axial clearance increases, allowing gears to shift out of optimal mesh. Metallic grinding noises during acceleration indicate that the washer has thinned, permitting steel-on-steel contact inside the differential housing. Excessive end-play in the output shaft can be detected during routine maintenance checks, leading to vibration and premature bearing wear. Contaminated transmission fluid with metallic particles is another clear sign that this thrust washer is deteriorating and requires immediate replacement.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 5838.300.129 |
| Material | Hardened steel with phosphate coating |
| Inner Diameter | 38 mm |
| Outer Diameter | 58 mm |
| Thickness | 3.0 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 5838.300.129 |
| Surface Finish | Ground, Ra 0.8 µm |
Compatibility
This thrust washer is specifically engineered for ZF heavy-duty transmissions used in construction machinery. It is a direct fit for the ZF WG180, WG200, and WG250 series power shift transmissions. The part also integrates seamlessly with ZF ERGOPOWER and ECOMIX driveline variants found in wheel loaders, graders, and dump trucks. For proper installation, ensure the 0750117075: TAPER ROLLER BEARING is inspected simultaneously, as bearing preload directly affects washer wear patterns. Additionally, the 5838300128: DIFFERENTIAL HOUSING must be free of scoring to guarantee correct thrust washer seating.
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 radial and axial loads on rotating shafts |
| 5838300128 | DIFFERENTIAL HOUSING | Encloses differential gears and thrust washers |
| 0631329086 | SPRING PIN | Secures thrust washer alignment during assembly |
| 5838300130 | THRUST WASHER | Alternate thickness variant for clearance adjustment |
| 5838300131 | AXLE BEVEL GEAR | Transfers power from differential to axle shafts |
| 5838300132 | COMPENS. STUB AXLE | Compensates for thermal expansion in driveline |
| 5838300133 | COMPENS. STUB AXLE | Secondary compensator for high-torque applications |
| 5838300134 | DIFFERENTIAL BEVEL GEAR | Meshes with axle bevel gear for final drive ratio |
