ZF 4651.221.023 TUBE for WG100 | OEM Genuine Part

Overview

The ZF 4651.221.023 TUBE is a precision-engineered fluid conduit designed specifically for the WG 100 series transmission family. This OEM genuine part, identified by SKU 4651.221.023, serves as a critical passageway for transmission oil flow between the valve body and the upper housing assembly. Positioned within the main control circuit, this tube ensures consistent hydraulic pressure delivery to the clutch packs and shift solenoids. Constructed from corrosion-resistant steel, it maintains structural integrity under high thermal loads and vibration. For technicians rebuilding a WG100, this tube is often replaced alongside the TRANSMISSION HOUSING and the HOUSING to guarantee a sealed hydraulic circuit.

Symptoms of Failure

• External oil seepage at the tube-to-housing interface: A worn or cracked 4651.221.023 tube allows pressurized ATF to escape, leaving visible drips under the bell housing area. This is a common long-tail search query for “ZF WG100 oil leak from tube.”
• Erratic gear engagement or delayed shifting: When the tube loses its seal, hydraulic pressure drops, causing soft shifts or hesitation between forward and reverse gears. Technicians often search for “WG100 shifting problems tube failure.”
• Transmission overheating due to low fluid level: A slow leak from this tube reduces the sump volume, leading to elevated operating temperatures and potential clutch slippage. This symptom is frequently queried as “ZF transmission overheating tube leak.”
• Audible whining noise from the pump: Air ingestion through a compromised tube creates cavitation, producing a high-pitched whine that intensifies under load. This is a specific failure mode for “ZF WG100 pump noise tube.”

Technical Specifications

Compatibility

This genuine ZF tube is engineered for the WG 100 series, which includes the WG100, WG120, and WG150 models. It is also compatible with the WG180 and WG200 transmissions when used in conjunction with the correct O-RING and HOUSING adapter. Always verify the tube routing against your specific transmission serial number, as variations exist between early and late production units. For heavy-duty applications in the WG180, this tube interfaces directly with the main control bore.

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