ZF 4699.803.070 GK20 II | OEM Genuine Part

Overview

The ZF 4699.803.070 GK20 II is a precision-engineered gearset assembly designed for the power take-off (PTO) section of heavy-duty construction machinery transmissions. This OEM genuine part, identified by SKU 4699.803.070, sits directly within the GK20 II clutch pack housing, where it transfers rotational force from the input shaft to the hydraulic pump drive. It is a critical component for maintaining consistent hydraulic pressure in excavators, wheel loaders, and crawler dozers. When installed alongside the 4699003064 GK20 II clutch assembly, it ensures seamless engagement for auxiliary equipment.

Symptoms of Failure

• Intermittent hydraulic pump disengagement: When the 4699.803.070 gearset wears, the PTO may slip under load, causing sudden loss of hydraulic power to attachments like buckets or breakers.
• Metallic grinding noise from transmission bell housing: Worn gear teeth produce a distinct high-pitched whine or grinding sound during cold starts, often mistaken for bearing failure.
• Oil contamination with brass or steel particles: Degraded gears shed fine metallic debris into the transmission fluid, visible during routine oil changes as glitter-like particles in the sump.
• Delayed PTO engagement: Operators may notice a 2-3 second lag between flipping the PTO switch and actual pump activation, indicating excessive backlash in the gearset.

Technical Specifications

Compatibility

This genuine ZF part is engineered for the GK20 II PTO assembly, which is standard on the following transmission models used in construction machinery: ZF WG180, ZF WG200, ZF WG210, and ZF WG220. It also fits select variants of the ZF 4WG-200 and ZF 5WG-210 series. The gearset interfaces directly with the 4699101109 HOUSING and the 4699102149 INPUT shaft, while the 4699103030 OUTPUT flange transmits power to the pump. Always verify your transmission serial number before ordering.

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