Overview
The ZF 1232.304.079 SHIM is a precision-engineered spacer component designed to maintain critical axial clearances within heavy-duty ZF transmissions used in construction machinery. This OEM genuine part sits between the differential housing and bearing assemblies, ensuring that gear mesh patterns remain within factory tolerances under extreme loads. The SKU 1232.304.079 is a select-fit shim that compensates for manufacturing variances, preventing premature wear on adjacent components such as the 5838109012: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING. Without proper shimming, the entire drivetrain assembly risks misalignment, leading to accelerated component fatigue.
Symptoms of Failure
- Excessive drivetrain backlash: When the 1232.304.079 shim compresses or corrodes, you will notice a clunking sensation when shifting between forward and reverse gears, particularly in wheel loaders and dozers.
- Oil contamination from metal debris: A worn shim allows the 2093209023: DIFFERENTIAL to contact the housing, generating fine metallic particles that appear in the transmission oil filter.
- Abnormal bearing noise: A high-pitched whine from the transmission center section indicates the taper roller bearing preload has been lost due to shim wear, requiring immediate inspection of the 1232.304.079.
- Oil seepage at the housing joint: A collapsed shim distorts the 5838300626: DIFFERENTIAL HOUSING seal surface, causing slow oil leaks that worsen under load.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 1232.304.079 |
| Material | Case-hardened steel (DIN 1.7131) |
| Outer Diameter | 82.5 mm |
| Inner Diameter | 62.0 mm |
| Thickness | 0.79 mm (select-fit range: 0.75–0.85 mm) |
| Weight | 0.042 kg |
| OEM Reference | ZF 1232.304.079 |
| Surface Finish | Ground, Ra ≤ 0.8 µm |
Compatibility
This shim is engineered for ZF powershift transmissions commonly found in construction machinery. It is directly compatible with the following ZF models: WG180, WG200, WG210, and 4WG200 series. The 1232.304.079 is also used in select 5WG300 variants where the differential preload must be adjusted using the 0631329088: SPRING PIN during reassembly. Always verify the shim stack height when replacing the 5838300811: THRUST WASHER or the 5838300721: AXLE BEVEL GEAR to ensure correct gear contact patterns.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on the differential |
| 2093209023 | DIFFERENTIAL | Secondary differential for multi-axle drive systems |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses and supports differential gears |
| 0631329088 | SPRING PIN | Secures shim and gear alignment during assembly |
| 5838300811 | THRUST WASHER | Controls axial end-play in the differential carrier |
| 5838300721 | AXLE BEVEL GEAR | Transfers power from differential to axle shafts |
| 5838300633 | AXLE | Driveshaft component connecting differential to wheels |
| 5838300753 | THRUST WASHER | Reduces friction between rotating gear faces |
| 5838300818 | THRUST WASHER | Compensates for thermal expansion in the gear stack |
Frequently Asked Questions
Q: Can I reuse the 1232.304.079 shim during a rebuild?
A: No. ZF specifies that this shim must be replaced whenever the differential or taper roller bearing is removed. The shim deforms plastically during initial torqueing and will not maintain correct preload if reused.
Q: How do I measure the correct shim thickness for my WG200 transmission?
A: Use a depth micrometer to measure the bearing bore depth in the differential housing, then subtract the bearing stack height. The 1232.304.079 is a 0.79 mm shim; if your calculated gap differs, you may need a shim from the 1232.304.070–1232.304.090 range.
Q: Will a worn shim cause damage to the axle bevel gear?
A: Yes. Excessive clearance from a collapsed shim allows the 5838300721: AXLE BEVEL GEAR to ride on the tooth tip instead of the flank, leading to chipping and eventual gear seizure.
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