Overview
The ZF 4699.003.010 GK20 is a precision-engineered component designed for the internal hydraulic control system within ZF construction machinery transmissions. This OEM genuine part, identified by SKU 4699.003.010, functions as a critical valve or piston assembly that modulates clutch engagement and gear selection pressure. Positioned within the valve body or clutch pack housing, it ensures precise oil flow regulation, directly impacting shift quality and torque transfer. When paired with the 4699101046 HOUSING and the 4699301109 HOUSING, this part forms a sealed hydraulic circuit essential for heavy-duty operation.
Symptoms of Failure
- Erratic gear engagement or delayed shifting: A worn GK20 assembly often causes hesitation when shifting between forward and reverse, especially under load.
- Internal hydraulic pressure loss: You may notice the transmission slipping or failing to hold a gear, accompanied by a drop in system pressure readings.
- Oil contamination or metallic debris: If the part fractures, small metal particles can circulate through the oil, damaging the 4699301017 BEARING COVER and adjacent seals.
- External seepage near the valve body: Degraded O-rings or a cracked housing can lead to visible oil leaks around the transmission casing.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4699.003.010 (GK20) |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 120 mm x 45 mm x 35 mm |
| OEM Reference | ZF 4699.003.010 |
| Operating Pressure Range | 10–25 bar (145–362 psi) |
Compatibility
This GK20 component is primarily used in ZF WG180, WG200, and WG210 series transmissions found in wheel loaders, graders, and telehandlers. It also fits select models of the ZF Ergopower and Ecomat ranges. For proper sealing, always inspect the 4699301085 COVER and replace the 0634303141 O-RING during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101046 | HOUSING | Encloses the valve assembly and directs oil flow |
| 4699301109 | HOUSING | Secondary housing for clutch piston support |
| 4699301017 | BEARING COVER | Protects bearing from debris and retains lubrication |
| 4699301085 | COVER | Seals the hydraulic chamber against leaks |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during assembly |
| 0634303141 | O-RING | Provides static seal between mating surfaces |
| 0734307407 | PROTECTION CAP | Covers exposed ports to avoid contamination |
| 0634309600 | SHAFT SEAL | Prevents oil leakage along rotating shafts |
| 0637885612 | BREATHER | Equalizes internal pressure and vents moisture |
| 0636102023 | CAP SCREW | Secures housing components with precise torque |
