ZF 4651.121.008 OIL PIPE for WG100 | OEM Genuine Part

Overview

The ZF 4651.121.008 OIL PIPE is a precision-engineered fluid conduit designed specifically for the WG 100 series transmission. This OEM genuine part, identified by SKU 4651.121.008, channels pressurized hydraulic oil from the valve body to the clutch packs and lubrication circuits within the gearbox. Positioned internally within the main casing, this pipe ensures consistent oil flow to critical rotating assemblies, preventing overheating and maintaining shift quality. It interfaces directly with the 4651101009: TRANSMISSION HOUSING and the 4651301025: HOUSING to create a sealed oil gallery system.

Symptoms of Failure

When the 4651.121.008 oil pipe deteriorates, operators often notice distinct performance issues. Common failure symptoms include:

• Hydraulic oil leaks near the transmission housing: Cracks or corrosion in the pipe cause fluid to escape, leading to low oil levels and potential gearbox damage.
• Erratic or delayed gear engagement: Reduced oil pressure from a compromised pipe results in sluggish shifting or slipping under load.
• Overheating of the transmission fluid: Restricted flow through a damaged pipe prevents adequate lubrication of bearings and gears, raising operating temperatures.
• Whining or grinding noises during operation: Insufficient oil delivery to clutch packs creates metal-on-metal contact, producing audible distress.

Technical Specifications

Compatibility

This oil pipe is engineered for the ZF WG 100 series transmission family. Based on its design and hydraulic routing, it is compatible with the following models: WG100, WG120, WG150, WG180, and WG200. It is also suitable for rebuilds of the WG 100 series where the 4651301031: HOUSING is used. Always verify fitment by cross-referencing your transmission serial number with the part number 4651.121.008.

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