ZF 4663.303.004 OIL TRAY | OEM Genuine Part

Overview

The ZF 4663.303.004 OIL TRAY is an OEM genuine component engineered to collect and channel transmission fluid within the lower sump area of heavy-duty construction machinery gearboxes. Positioned directly beneath the rotating clutch packs and planetary gear sets, this stamped steel tray prevents oil starvation by directing lubricant back to the pump intake. The part number 4663.303.004 is a direct factory replacement, ensuring proper fluid flow dynamics and preventing aeration in high-torque applications. This tray works in conjunction with the 4663101003: HOUSING to create a sealed oil reservoir, and it is secured by the 0636100817: CAP SCREW fasteners that maintain clamping force against vibration.

Symptoms of Failure

• Visible oil leaks beneath the transmission bell housing — A cracked or warped oil tray allows fluid to escape past the gasket surface, leaving puddles under the machine after shutdown.
• Intermittent gear slipping under load — When the tray fails to return oil to the sump, the hydraulic pressure drops, causing clutch packs to slip during digging or lifting operations.
• Overheating transmission with erratic shift timing — Insufficient oil volume due to tray leakage leads to thermal breakdown of the fluid, triggering delayed shifts and elevated temperature warnings.
• Contaminated oil from debris ingress — A fractured tray can allow dirt and metal particles to enter the oil circuit, accelerating wear on the 0631306816: CYLINDRICAL PIN and other precision components.

Technical Specifications

Compatibility

This oil tray is designed for ZF WG series powershift transmissions commonly found in wheel loaders, dozers, and excavators. It is a direct fit for the WG180, WG200, and WG211 models. It also applies to the 4WG-200 and 6WG-200 variants used in construction machinery from 1998 onward. The tray interfaces with the 4663301026: COVER to seal the lower housing, and it is often replaced alongside the sump gasket during a major overhaul.

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