ZF 4108.007.004 PK 6500 | OEM Genuine Part

Overview

The ZF 4108.007.004 PK 6500 is a genuine OEM component engineered for heavy-duty construction machinery transmissions. This part functions as a critical sealing and pressure-control element within the main valve body assembly, regulating hydraulic flow to the clutch packs and planetary gear sets. As an OEM genuine part, it ensures precise fitment and long service life under extreme loads. The SKU 4108.007.004 is specifically designed to interface with the TRANSMISSION HOUSING (part 4108101128) and the HOUSING (part 4108201296) to maintain proper oil circuit integrity. Without this component, the transmission cannot build adequate line pressure for gear engagement.

Symptoms of Failure

• Delayed or harsh gear engagement — When the 4108.007.004 wears, hydraulic pressure drops, causing a noticeable lag when shifting from neutral to drive or reverse.
• Internal oil leaks — A worn sealing surface allows transmission fluid to bypass the valve body, leading to low oil levels and visible drips under the bell housing.
• Intermittent gear slipping under load — Operators may experience the transmission slipping out of gear when climbing grades or carrying heavy loads, especially in WG180 and WG200 series units.
• Erratic shift patterns — The transmission may hunt between gears or fail to upshift at proper RPM due to inconsistent hydraulic pressure from a failing PK 6500 valve.

Technical Specifications

Compatibility

This genuine ZF part is compatible with the following transmission models commonly found in construction machinery such as wheel loaders, dozers, and graders:

• ZF WG180
• ZF WG200
• ZF WG210
• ZF 4WG-200
• ZF 4WG-210

Always verify the SCREW PLUG (4475280018) and OIL LEVEL GAGE (0501215601) are in good condition when replacing this part, as they seal the same hydraulic circuit.

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