Overview
The ZF 0730.109.578 SHIM is a precision-engineered OEM genuine spacer component designed to maintain critical axial clearances within heavy-duty ZF transmissions. Positioned between the main shaft assembly and the gear train, this shim compensates for manufacturing tolerances and thermal expansion, ensuring that rotating elements remain correctly aligned under load. The SKU 0730.109.578 is a factory-specified part for construction machinery applications, where vibration and high torque demand exacting dimensional stability. Without this shim, the transmission’s internal geometry shifts, leading to premature wear on adjacent components such as the 2094104412 MAIN SHAFT and the 2094304054 MAIN SHAFT.
Symptoms of Failure
- Transmission oil leaks at shaft seals: When the shim wears or deforms, the main shaft can shift axially, distorting the seal lip and allowing hydraulic fluid to escape. This often appears as a slow drip near the bell housing.
- Gear slipping under load: Incorrect shim thickness reduces the engagement depth of the shift system, causing the 2094106010 SHIFT SYSTEM to lose positive contact with the gear dog teeth.
- Abnormal whining or grinding noise: Excessive end-play from a collapsed shim allows the 2094206001 GEARSHIFT SHAFT to contact the housing, producing a metallic scraping sound during acceleration.
- Hard shifting or gear clash: Worn shims alter the neutral position of the shift forks, making it difficult to engage gears without double-clutching.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0730.109.578 |
| Material | Case-hardened spring steel (DIN 1.3505) |
| Outer Diameter | 68.0 mm |
| Inner Diameter | 42.0 mm |
| Thickness | 1.50 mm (selective fit range: 1.45–1.55 mm) |
| Weight | 22 grams |
| OEM Reference | ZF 0730.109.578 |
| Surface Finish | Ground, deburred edges |
Compatibility
This shim is engineered for ZF heavy-duty powershift transmissions commonly found in construction machinery. It is a direct fit for the following transmission models: WG180, WG200, WG210, and WG240 series. It also applies to certain off-highway variants in the 4WG-200 and 5WG-210 families. Always verify the stack height during rebuild; pairing this shim with a new 2094304054 MAIN SHAFT ensures the correct preload on the bearing pack.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094104412 | MAIN SHAFT | Transfers torque from the engine to the gear cluster |
| 2094304054 | MAIN SHAFT | Secondary shaft supporting the output gear train |
| 2094106010 | SHIFT SYSTEM | Hydraulic-mechanical assembly that selects gear ratios |
| 2094206001 | GEARSHIFT SHAFT | Transmits shift fork movement to the sliding sleeves |
| 2094306053 | GEARSHIFT SHAFT | Alternate shaft for reverse gear engagement |
| 0630513070 | SNAP RING | Secures the shim and bearing in the housing groove |
| 2094306019 | WASHER | Thrust washer that distributes axial load from the shaft |
| 0732040444 | COMPRESSION SPRING | Provides return force for the shift rail detent |
| 0732040728 | COMPRESSION SPRING | Higher-rate spring for the main shift valve spool |
| 2093206001 | BUSH | Bronze-lined bushing that supports the gearshift shaft |
Frequently Asked Questions
Q: Can I reuse the old shim if it looks flat?
A: No. Even if the shim appears unworn, it may have work-hardened or suffered micro-cracking. ZF recommends replacing the 0730.109.578 shim every time the main shaft or bearing pack is removed to guarantee the correct end-play.
Q: How do I measure the correct shim thickness for my transmission?
A: Install the main shaft and bearing without the shim, then measure the axial gap using a depth micrometer. Select the shim thickness that brings the total clearance within 0.05–0.15 mm. The 0730.109.578 is a standard 1.50 mm shim; if a different thickness is needed, use a selective-fit shim from the same ZF series.
Q: Will this shim fit the ZF 4WG-200 transmission?
A: Yes. The 0730.109.578 is listed in the ZF parts catalog for the 4WG-200, 5WG-210, and WG180/200/210/240 series. Always cross-reference your transmission serial number to confirm.
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