Overview
The ZF 4699.841.021 GK26LD is a critical OEM genuine component designed for heavy-duty construction machinery transmissions. This part functions as a precision-machined housing element within the valve body assembly, directing hydraulic fluid flow to control clutch engagement and gear selection. The SKU 4699.841.021 ensures exact OEM fitment and durability under extreme loads, reducing downtime in excavators, wheel loaders, and graders. It integrates seamlessly with the transmission’s hydraulic circuit to maintain consistent pressure and lubrication.
Symptoms of Failure
- Erratic gear engagement or slipping: When the 4699.841.021 wears, hydraulic pressure drops, causing delayed or rough shifting under load.
- External oil leaks near the valve body: Cracks or warping in this housing lead to fluid seepage, often mistaken for seal failures.
- Overheating transmission: Restricted oil flow from a damaged GK26LD component forces the system to work harder, raising operating temperatures.
- Intermittent loss of drive: Worn internal channels fail to maintain clutch pack pressure, resulting in sudden power loss during operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.841.021 |
| Material | High-strength aluminum alloy (die-cast) |
| Weight | 1.85 kg (4.08 lbs) |
| Dimensions (L x W x H) | 210 mm x 95 mm x 65 mm |
| OEM Reference | ZF GK26LD |
| Surface Finish | Anodized corrosion-resistant coating |
| Operating Pressure Range | 12–18 bar (174–261 psi) |
Compatibility
This genuine ZF part is engineered for the GK26LD valve housing series, commonly used in ZF WG180, WG200, and WG210 transmission models. These transmissions power off-highway construction equipment such as compactors, dump trucks, and telehandlers. Always verify your transmission serial number before ordering to ensure correct fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101086 | HOUSING | Encloses the main gear train; mounts directly to the GK26LD assembly |
| 4699301223 | HOUSING | Secondary housing for clutch pack support |
| 0636302022 | SCREW PLUG | Seals hydraulic test ports in the valve body |
| 0501319149 | SCREW PLUG | Magnetic drain plug for debris collection |
| 0634801038 | SEALING RING | Prevents fluid bypass between housing joints |
| 0730365801 | TYPE PLATE | Identification tag for transmission model |
| 0501323165 | SHAFT SEAL | Dynamic seal for rotating output shaft |
| 4699301222 | COVER | Protects valve body from debris ingress |
| 0634303996 | O-RING | Static seal for hydraulic line connections |
| 0630513060 | SNAP RING | Retains bearing assemblies in the housing |
