ZF 4407.301.142 WASHER | OEM Genuine Part

Overview

The ZF 4407.301.142 WASHER is a precision-engineered OEM genuine component designed to maintain critical axial clearances within the clutch pack and planetary gear assemblies of heavy-duty construction machinery transmissions. This hardened steel washer acts as a load-bearing spacer, preventing metal-on-metal contact between rotating and stationary elements. The SKU 4407.301.142 is specifically positioned between the sun gear and the reaction hub in the main drive train, where it absorbs thrust loads during gear shifts and high-torque operations. Without this exact washer, internal tolerances shift, leading to accelerated wear on adjacent components such as the 4143101009: HOUSING and the 4143301025: HOUSING.

Symptoms of Failure

• Transmission oil leaks at the clutch housing interface: When the 4407.301.142 washer wears beyond its tolerance, it allows the 0634313603: O-RING to shift out of its groove, creating a path for pressurized ATF to escape. This often presents as a slow drip near the bell housing.
• Delayed or harsh engagement when shifting from neutral to drive: A worn washer reduces preload on the clutch pack, causing the 4475280018: SCREW PLUG to lose its sealing integrity. Operators report a noticeable “clunk” or a 2-3 second delay before power is transmitted.
• Metallic grinding noise during low-speed maneuvering: As the washer thickness decreases, the planetary gears contact the housing directly. This symptom is most audible when the machine is under load in reverse.
• Contaminated transmission fluid with bronze or steel particles: Flaking from a fatigued washer circulates through the valve body, clogging the 4143221013: THROTTLE VALVE and causing erratic shift patterns.

Technical Specifications

Compatibility

This washer is a direct fit for ZF WG180, WG200, and WG210 series transmissions commonly found in wheel loaders, telehandlers, and graders from manufacturers such as Liebherr, Caterpillar, and Volvo. It also applies to the ZF 4WG-200 and 4WG-310 variants used in underground mining equipment. Always verify the part number against your transmission’s serial plate; the 4407.301.142 supersedes earlier washer designs with a thicker profile to reduce fretting wear.

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