Overview
The ZF 0730.009.688 SHIM is a precision-engineered OEM genuine part designed to establish critical axial clearances within heavy-duty ZF transmissions used in construction machinery. This shim sits between the differential housing and bearing races, ensuring correct preload on rotating assemblies. The SKU 0730.009.688 is specifically calibrated to maintain optimal gear mesh patterns, preventing excessive end-play that leads to premature wear. When installed alongside a 2093109029: DIFFERENTIAL, this shim guarantees that the differential assembly operates within factory tolerances, reducing vibration and extending service life.
Symptoms of Failure
When the ZF 0730.009.688 SHIM wears or is incorrectly selected, operators will notice distinct failure modes. Oil leaks from the differential housing occur as misalignment stresses the seal surfaces. Gear slipping under load becomes apparent during excavation or grading, as incorrect shim thickness allows the ring gear to walk away from the pinion. Whining noise from the transmission center section indicates insufficient preload on the 0750117075: TAPER ROLLER BEARING, allowing axial movement. Premature bearing failure follows when shim degradation creates excessive clearance, causing brinelling on raceways.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0730.009.688 |
| Material | Case-hardened spring steel (C67S) |
| Thickness | 0.50 mm (nominal) |
| Outer Diameter | 68.0 mm |
| Inner Diameter | 42.0 mm |
| Weight | 0.012 kg |
| OEM Reference | ZF 0730.009.688 |
| Hardness | HRC 45-50 |
Compatibility
This shim is a standard component in ZF WG180, WG200, and WG310 series transmissions commonly found in wheel loaders, graders, and excavators. It is also used in ZF 4WG-200 and 5WG-310 power shift transmissions. The 0730.009.688 SHIM directly interfaces with the 2093209094: DIFFERENTIAL assembly and the 2093309078: DIFF.HOUSING. Always verify shim stack height when replacing the differential or housing to maintain proper bearing preload.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109029 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential rotation under load |
| 2093209094 | DIFFERENTIAL | Secondary differential for multi-axle drives |
| 2093309078 | DIFF.HOUSING | Encloses differential gear set |
| 0631100223 | SPRING PIN | Locks shim and gear alignment |
| 0730300820 | THRUST WASHER | Controls axial clearance on gear faces |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 2097309085 | DIFFERENTIAL AXLE | Carries differential side gears |
| 5838300811 | THRUST WASHER | Reduces friction on differential cross shaft |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Drives axle bevel gear set |
Frequently Asked Questions
Q: How do I know if the 0730.009.688 shim is the correct thickness for my rebuild?
A: Measure the existing shim stack and bearing preload using a dial indicator. The 0730.009.688 is a 0.50 mm shim; combine with other thicknesses to achieve the specified end-play of 0.05-0.15 mm for WG200 series transmissions.
Q: Can I reuse this shim after disassembly?
A: No. ZF recommends replacing all shims (0730.009.688) during any differential or bearing service. The shim work-hardens and may crack if reused, leading to sudden clearance loss.
Q: Does this shim fit both the front and rear differentials?
A: Yes, the 0730.009.688 is used in both positions on WG180 and WG200 transmissions. However, always check the housing bore depth as rear differentials sometimes require a thicker stack.
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