ZF 4651.321.007 SUCTION TUBE for WG100 | OEM Genuine Part

Overview

The ZF 4651.321.007 SUCTION TUBE is a critical hydraulic component engineered specifically for the WG 100 Series transmission. This OEM genuine part serves as the primary conduit for drawing transmission fluid from the sump into the pump, ensuring consistent lubrication and cooling under heavy load conditions. Positioned within the lower valve body assembly, the SKU 4651.321.007 connects directly to the TRANSMISSION HOUSING to maintain a sealed fluid path. Without this tube, the transmission cannot maintain proper hydraulic pressure, leading to immediate operational failure.

Symptoms of Failure

When the 4651.321.007 suction tube degrades, operators often notice distinct performance issues. Look for these specific failure symptoms:

• Low fluid pressure warnings – A cracked or warped tube allows air ingestion, causing erratic pressure readings on the dash.
• Gear slipping under load – Insufficient fluid delivery starves the torque converter, resulting in delayed engagement or complete slip during uphill climbs.
• Visible oil leaks near the pump housing – The tube’s sealing surface can corrode, dripping ATF onto the bell housing or ground.
• Whining or cavitation noise – Air bubbles drawn through a damaged tube create a high-pitched whine that worsens with RPM.

Technical Specifications

Compatibility

This suction tube is primarily designed for the WG 100 Series transmissions, including models WG100, WG120, and WG150. It also fits select variants of the WG180 and WG200 when used with the appropriate HOUSING (4651301029) or HOUSING (4651301024). Always verify the mounting flange geometry against your existing assembly before installation.

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