Overview
The ZF 2099.240.003 LIFTING SHAFT is a precision-engineered OEM genuine component designed for the internal gear train of heavy-duty ZF transmissions. This shaft serves as the critical pivot point for the lifting mechanism within the differential housing, directly engaging with the axle bevel gear set to control load distribution. As a core element of the gear cluster, the SKU 2099.240.003 ensures smooth rotational torque transfer between the differential assembly and the output shafts. It is manufactured from case-hardened alloy steel to withstand extreme torsional stress in vocational trucks and construction equipment.
Symptoms of Failure
- Intermittent gear slipping under load: A worn lifting shaft causes the differential gears to lose mesh engagement, resulting in sudden power loss during acceleration or climbing.
- Metallic grinding noise from the transmission housing: Excessive play in the shaft bore produces a distinct scraping sound, particularly when turning or reversing.
- Oil contamination with metallic debris: Surface spalling on the lifting shaft sheds ferrous particles into the lubricant, visible during drain intervals as glitter in the oil.
- Hard shifting or gear lock-up: A bent or fatigued shaft prevents the differential bevel gear from rotating freely, causing the transmission to bind in neutral.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2099.240.003 |
| Material | Case-hardened 20MnCr5 alloy steel |
| Overall Length | 187 mm (estimated) |
| Outer Diameter | 42 mm (bearing journal) |
| Weight | 1.85 kg (4.08 lbs) |
| OEM Reference | ZF 2099.240.003 |
| Hardness | 58-62 HRC (surface) |
Compatibility
This lifting shaft is engineered for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It also fits select WG180 and WG200 variants when used with the corresponding DIFFERENTIAL (2093109029) and DIFFERENTIAL (2093209094) assemblies. For proper installation, always pair the shaft with a new TAPER ROLLER BEARING (0750117075) and verify the DIFF.HOUSING (2093309078) bore condition. The shaft is not compatible with older ZF 4HP or 5HP series.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109029 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports shaft radial and axial loads |
| 2093209094 | DIFFERENTIAL | Alternate differential assembly for WG130 |
| 2093309078 | DIFF.HOUSING | Encloses differential gear set |
| 0631100223 | SPRING PIN | Secures shaft to housing bore |
| 0730300820 | THRUST WASHER | Reduces axial end-play on shaft |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 2097309085 | DIFFERENTIAL AXLE | Carries differential side gears |
| 5838300811 | THRUST WASHER | Spacer for differential gear stack |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Primary gear meshing with lifting shaft |
Frequently Asked Questions
Q: Can the 2099.240.003 lifting shaft be reused after a transmission rebuild?
A: No. ZF recommends replacing this shaft during any major overhaul due to micro-cracking from cyclic loading. Always install a new OEM part to avoid premature failure.
Q: What torque specification is required for the retaining bolt on this shaft?
A: The shaft is retained by a spring pin (part 0631100223), not a bolt. The pin must be driven flush with the housing surface; no torque value applies.
Q: Does this part fit the ZF WG180 transmission?
A: Yes, but only when used with the 2093209094 differential assembly and the 2093309078 diff.housing. Verify your housing bore diameter before ordering.
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