Overview
The ZF 4699.035.004 GP35 is a genuine OEM component engineered for the demanding environment of construction machinery transmissions. This part functions as a critical pressure-regulating valve within the hydraulic control system of ZF power shift transmissions, ensuring precise clutch engagement and smooth gear changes. The SKU 4699.035.004 is specifically designed to maintain consistent oil flow and pressure, directly influencing the operational efficiency of the entire driveline. It is typically located within the valve body assembly, where it interfaces directly with the 4699101160: HOUSING to direct hydraulic fluid to the correct clutch packs.
Symptoms of Failure
When the ZF 4699.035.004 GP35 begins to wear, operators will notice distinct performance degradation. Common failure indicators include:
- Erratic or harsh shifting: The transmission may slam into gear or hesitate between shifts due to inconsistent hydraulic pressure regulation.
- Delayed engagement: A noticeable lag when moving from neutral to drive or reverse, often accompanied by a low-pressure warning.
- Internal transmission slippage: Under load, the machine may lose power transfer as the valve fails to hold pressure, causing clutch pack slip.
- Contaminated hydraulic fluid: Metal particles in the oil filter or sump indicate the valve spool is wearing against the 4699102188: INPUT bore, requiring immediate inspection.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4699.035.004 |
| Material | Hardened Steel Alloy (Nitrided) |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 142 mm |
| Diameter | 28 mm (spool bore) |
| OEM Reference | ZF 4699.035.004 |
| Seal Type | O-Ring (integrated) |
Compatibility
This genuine GP35 valve is primarily compatible with ZF WG series transmissions used in heavy construction equipment. It is a direct fit for the following transmission models:
- ZF WG180
- ZF WG200
- ZF WG210
- ZF WG310
Proper installation requires careful alignment with the 4699103126: OUTPUT shaft assembly and the 4699109106: BRAKE PARTS kit to ensure correct hydraulic circuit sealing. Always replace the associated sealing rings and plugs during service.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101160 | HOUSING | Encloses the valve body and directs oil flow |
| 4699102188 | INPUT | Transfers torque from engine to transmission |
| 4699103126 | OUTPUT | Delivers power to the driveline |
| 4699109106 | BRAKE PARTS | Provides parking and service braking |
| 4699309124 | HOUSING COVER | Seals the valve housing assembly |
| 0636104255 | CAP SCREW | Secures housing components |
| 0631306174 | CYLINDRICAL PIN | Aligns valve body sections |
| 0636302013 | SCREW PLUG | Seals hydraulic test ports |
| 0501331653 | SCREW PLUG | Closes pressure relief passages |
| 0634801038 | SEALING RING | Prevents fluid leakage at joints |
