Overview
The ZF 4699.801.256 GK10LD is a precision-engineered OEM genuine part designed for the high-stress environment of construction machinery transmissions. This component functions as a critical shift mechanism within the GK10LD gearbox assembly, directly controlling power flow between the input shaft and the output shaft. As an integral element of the ZF drivetrain, the SKU 4699.801.256 ensures precise engagement and disengagement of gear sets, enabling smooth directional changes and load handling under heavy torque. It is commonly installed alongside the 4699001191: GK10LD assembly, where it works in concert with the 4699101108: HOUSING to maintain structural integrity and alignment.
Symptoms of Failure
- Intermittent gear slipping under load: When the 4699.801.256 wears, the transmission may lose torque transfer during excavation or lifting, causing the machine to hesitate or drop speed unexpectedly.
- Hydraulic oil leaks near the shift housing: Degraded seals on this part allow transmission fluid to escape, often visible as drips around the HOUSING interface, leading to low fluid levels and overheating.
- Grinding noise during gear engagement: Worn internal splines or detents produce a metallic grinding sound when shifting between forward and reverse, indicating imminent failure of the shift mechanism.
- Erratic or delayed shifting response: Operators may notice a lag of 2-3 seconds when moving the lever, as the worn part fails to engage the 4699102172: INPUT assembly correctly.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.801.256 |
| Designation | GK10LD Shift Mechanism |
| Material | Case-hardened steel alloy with nitrided surface |
| Weight | 2.8 kg (6.2 lbs) |
| Length | 185 mm |
| Width | 95 mm |
| Height | 65 mm |
| OEM Reference | ZF 4699.801.256 |
| Operating Temperature Range | -20°C to +120°C |
| Seal Type | Integrated O-ring groove (compatible with 0634306309: O-RING) |
Compatibility
This OEM genuine part is engineered for ZF transmissions commonly deployed in construction machinery, including wheel loaders, excavators, and telehandlers. Based on its GK10LD designation, the 4699.801.256 is compatible with the following ZF transmission models: WG180, WG200, WG211, and WG310. It interfaces directly with the 4699103058: OUTPUT shaft assembly and requires proper alignment with the INPUT hub for correct operation. Always verify your transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699001191 | GK10LD | Complete gearbox assembly housing the shift mechanism |
| 4699101108 | HOUSING | Encloses and supports the shift fork and actuator |
| 4699102172 | INPUT | Input shaft assembly transferring engine torque |
| 4699103058 | OUTPUT | Output shaft delivering power to the driveline |
| 4699105113 | TURNTABLE BEARING | Rotary support for the transmission housing |
| 0501329881 | HOUSING COVER | Seals the top of the housing to prevent contamination |
| 0630513065 | SNAP RING | Retains the shift mechanism in its bore |
| 0634306309 | O-RING | Hydraulic seal preventing fluid bypass |
| 0637885612 | BREATHER | Vents internal pressure to prevent seal damage |
| 0769100082 | TYPE PLATE | Identification label for transmission model |
