ZF 4644.121.463 OIL PIPE for WG200 | OEM Genuine Part

Overview

The ZF 4644.121.463 OIL PIPE is a critical fluid routing component engineered specifically for the WG 200 series transmission. This OEM genuine part directs pressurized hydraulic oil from the valve body to the clutch packs and torque converter, ensuring precise lubrication and cooling within the gear train. The SKU 4644.121.463 is machined to exact ZF tolerances to maintain consistent flow rates under high thermal loads. When installed alongside the 4644101164 TRANSMISSION HOUSING and the 4644301371 TRANSMISSION HOUSING, this oil pipe forms a sealed circuit that prevents cross-contamination between lubrication and control circuits.

Symptoms of Failure

• Low hydraulic pressure and delayed engagement: A cracked or clogged 4644.121.463 oil pipe reduces line pressure, causing hesitation when shifting from neutral to drive or reverse.
• External oil seepage near the bell housing: Worn sealing surfaces on this pipe allow ATF to weep past the O-rings, leaving visible drips under the transmission after extended operation.
• Intermittent gear slippage under load: Insufficient oil delivery to the clutch packs due to a restricted pipe leads to momentary loss of torque transfer during uphill climbs or heavy hauling.
• Overheating transmission fluid: When the oil pipe cannot supply adequate cooling flow to the torque converter, fluid temperatures rise above 120°C, triggering warning lights.

Technical Specifications

Compatibility

This oil pipe is primarily designed for the ZF WG200 series transmissions used in medium-duty trucks, buses, and construction equipment. Based on its hydraulic routing geometry, the 4644.121.463 also fits WG180 and WG190 variants that share the same valve body layout. Always verify the 0730365067 TYPE PLATE on your transmission to confirm model identification. The pipe mounts directly to the main casing using a 0631311009 GROOVED STUD to ensure vibration-resistant retention.

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