ZF 4699.823.087 GP21 | OEM Genuine Part

Overview

The ZF 4699.823.087 GP21 is a precision-engineered genuine OEM part designed for the hydraulic control system within heavy-duty ZF transmissions. This component, identified by SKU 4699.823.087, functions as a critical pressure-regulating valve or shift actuator, ensuring precise clutch engagement and disengagement in construction machinery. It sits within the valve body assembly, directing oil flow to the appropriate clutch packs. For optimal assembly integrity, this part is often replaced alongside the 4699100019: BASIC PARTS kit, which includes necessary seals and gaskets.

Symptoms of Failure

• Erratic gear engagement or delayed shifting: When the 4699.823.087 wears, internal spools stick, causing hesitation when moving from forward to reverse or between gears.
• Transmission slipping under load: A worn GP21 valve fails to maintain proper hydraulic pressure, leading to clutch pack slippage during heavy digging or lifting operations.
• Oil contamination and debris in the pan: Degraded internal seals from this part can shed material, clogging the filter and reducing overall transmission efficiency.
• Harsh or jarring shifts: Loss of modulation control results in abrupt clutch application, which can damage the 4699300156: GEAR SHAFT and surrounding planetary assemblies.

Technical Specifications

Compatibility

This genuine ZF GP21 valve is primarily used in the WG180, WG200, and WG210 series transmissions commonly found in wheel loaders, excavators, and telehandlers. It is also compatible with certain variants of the 4WG-200 and 6WG-200 power shift transmissions. When servicing these units, always inspect the 4699300139: HOUSING for scoring or cracks, as a damaged housing can compromise the new valve’s performance. Additionally, verify the condition of the 4699300127: PLANET CARRIER to ensure proper gear alignment.

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