ZF 4699.827.028 GP27 | OEM Genuine Part

Overview

The ZF 4699.827.028 GP27 is a critical planetary gearset assembly engineered for high-torque applications in construction machinery transmissions. Positioned within the main drive train of ZF power shift transmissions, this OEM genuine part (SKU: 4699.827.028) functions as the primary torque multiplication stage, converting engine output into usable wheel or track motion. Designed to withstand extreme loads and thermal cycling, the GP27 assembly integrates directly with the HOUSING and INPUT shaft to ensure seamless power delivery. As a direct replacement component, it restores factory-specified gear ratios and reduces internal friction in heavy-duty equipment.

Symptoms of Failure

• Intermittent gear slipping under load: Worn planetary gears in the GP27 cause sudden loss of torque during excavation or lifting operations, often accompanied by a grinding noise.
• Metallic debris in transmission fluid: Flaking or pitting on gear teeth generates fine steel particles, detectable during routine oil changes or filter inspections.
• Delayed engagement or harsh shifting: Damaged internal bearings or sun gear wear leads to sluggish clutch pack response, particularly when shifting from neutral to forward or reverse.
• Oil leaks near the transmission housing: Cracks in the GP27 carrier or seal failures allow hydraulic fluid to escape, visible as drips around the OUTPUT flange area.

Technical Specifications

Compatibility

This GP27 assembly is specifically designed for ZF WG180, WG200, and WG210 series power shift transmissions commonly used in wheel loaders, dozers, and telehandlers. It also fits select variants of the ZF 4WG-200 and 6WG-200 models. For proper installation, ensure the GP25 planetary set is inspected simultaneously, as these two gearsets share load distribution in the same planetary carrier. Always verify transmission serial numbers against ZF application guides before ordering.

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