ZF 4699.823.082 GP21 | OEM Genuine Part

Overview

The ZF 4699.823.082 GP21 is a genuine OEM hydraulic control valve assembly designed for the clutch modulation and shift sequencing within heavy-duty ZF transmissions used in construction machinery. This SKU 4699.823.082 sits directly on the transmission valve body, regulating oil pressure to engage and disengage specific clutch packs. As a precision-machined component, it ensures smooth power transfer under extreme load conditions. When replacing this unit, it is critical to also inspect the 4699100022: BASIC PARTS kit, which includes necessary seals and gaskets for a leak-free installation.

Symptoms of Failure

• Delayed or harsh gear engagement: When the GP21 valve spool sticks due to contamination, operators experience a noticeable lag or jarring shift when moving from neutral to forward or reverse.
• Transmission overheating under load: A worn 4699.823.082 can cause constant clutch slip, generating excessive heat and triggering warning lights on the dashboard.
• Intermittent loss of drive in specific gears: Internal leakage past the valve lands results in insufficient clutch pressure, causing the machine to lose power in higher gears during uphill operations.
• Hydraulic oil contamination: Debris from a failing GP21 can circulate through the system, accelerating wear on the 4699300138: HOUSING and other precision components.

Technical Specifications

Compatibility

This GP21 valve assembly is engineered for ZF’s WG series powershift transmissions commonly found in wheel loaders, graders, and telehandlers. It is directly compatible with the following transmission models: WG180, WG200, WG210, and WG250. For proper assembly, ensure the 4699300156: GEAR SHAFT is free of scoring, and the 4699300127: PLANET CARRIER is correctly aligned during reinstallation.

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