Overview
The ZF 4699.801.117 GK10 is a precision-machined gearshift unit designed for heavy-duty construction machinery transmissions. This OEM genuine part controls the engagement and disengagement of gear sets within the transmission housing, ensuring smooth power transfer under extreme loads. The SKU 4699.801.117 is a critical component of the shift mechanism assembly, directly interfacing with the HOUSING to maintain precise alignment of shift forks. Without this GK10 unit, the transmission cannot reliably select gears, making it essential for excavators, wheel loaders, and other off-highway equipment operating in demanding environments.
Symptoms of Failure
When the ZF 4699.801.117 GK10 begins to wear, operators typically notice three distinct failure modes. First, gear engagement hesitation or grinding occurs during shifts, especially under load, as the shift mechanism loses its indexing precision. Second, intermittent gear slipping in higher ranges signals that the GK10 can no longer hold the selected gear position. Third, increased shift lever effort or a notchy feel when moving through the pattern indicates binding or wear in the GK10 assembly. In advanced cases, transmission fluid contamination from metallic particles may appear, as the worn part sheds material into the oil circuit. These symptoms often prompt replacement of the entire shift unit rather than individual components.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.801.117 |
| Designation | GK10 Gearshift Unit |
| Material | Case-hardened steel with nitrided surfaces |
| Weight | 1.45 kg (3.2 lbs) |
| Length | 187 mm |
| Width | 68 mm |
| Height | 52 mm |
| OEM Reference | ZF 4699.801.117 |
| Operating Temperature | -40°C to +120°C |
| Sealing Interface | Requires O-RING (0634306309) |
Compatibility
This GK10 shift unit is engineered for ZF’s WG series powershift transmissions commonly used in construction machinery. It is a direct fit for the WG180, WG200, and WG211 models, as well as the WG310 series found in larger wheel loaders. The part also appears in select Ecomat 4HP and 6HP off-highway variants where the shift mechanism is externally mounted. When replacing the GK10, always inspect the HOUSING COVER for wear at the shift rail bores, and replace the BREATHER to prevent moisture ingress that accelerates corrosion of the shift mechanism.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101090 | HOUSING | Encloses and aligns the shift mechanism |
| 0501329881 | HOUSING COVER | Seals the shift housing and supports shift rails |
| 0634306309 | O-RING | Provides hydraulic seal between shift unit and housing |
| 0637885612 | BREATHER | Equalizes pressure and prevents contamination |
| 0501319149 | SCREW PLUG | Closes unused shift port openings |
| 0636302022 | SCREW PLUG | Magnetic drain plug for ferrous debris capture |
| 0634801038 | SEALING RING | Copper washer for plug sealing |
| 0730365801 | TYPE PLATE | Identification plate with transmission serial number |
| 4699001117 | GK10 | Alternate variant of the shift unit |
| 4699102071 | INPUT | Input shaft assembly for the transmission |
