Overview
The ZF 4699.801.078 GK10 is a genuine OEM clutch pack assembly engineered for the demanding environment of construction machinery transmissions. This critical component sits within the planetary gearset, managing torque transfer between rotating shafts to enable smooth gear engagement under heavy loads. As a direct replacement for the SKU 4699.801.078, this part ensures that hydraulic pressure is correctly applied to the friction discs, preventing power loss during excavation, grading, or material handling operations. Designed to withstand high thermal stress and continuous shock loads, the GK10 assembly maintains precise clutch clearance, which is essential for reliable shifting in wheel loaders and dozers.
Symptoms of Failure
When the ZF 4699.801.078 wears out, operators often notice delayed engagement when shifting from neutral to forward or reverse, particularly after the transmission has warmed up. A second common failure sign is intermittent gear slipping under load, where the machine loses power momentarily while climbing a grade or pushing material. You may also detect dark, burnt-smelling transmission fluid caused by overheated friction material, which indicates the clutch pack is no longer gripping properly. Finally, erratic or harsh shifting can occur as the worn discs fail to modulate hydraulic pressure smoothly, leading to driveline shock that stresses axles and differentials.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4699.801.078 (GK10) |
| Assembly Type | Clutch Pack (Friction & Steel Discs) |
| Outer Diameter | Approx. 180 mm |
| Inner Diameter | Approx. 120 mm |
| Number of Friction Discs | 5 |
| Number of Steel Discs | 5 |
| Material | Sintered Bronze on Steel Core (Friction) / Hardened Alloy Steel (Reaction) |
| Weight | 2.4 kg (5.3 lbs) |
| OEM Reference | ZF Friedrichshafen AG |
Compatibility
This clutch pack is primarily designed for use in ZF WG180 and WG200 series transmissions, which are common in mid-sized construction machinery. It also fits select variants of the ZF WG150 and WG210 models, particularly those used in telescopic handlers and compact wheel loaders. For accurate fitment, always verify the transmission serial number against the OEM parts catalog, as internal clutch configurations can vary by production year. The 4699.801.078 is not compatible with older ZF 4WG-65 or 4WG-95 series without modification to the piston housing.
Common Applications
- Case 621E / 721E Wheel Loaders
- New Holland W170C / W190C Loaders
- JCB 435 / 456 Wheel Loaders
- Volvo L70 / L90 Series (with ZF WG200)
