ZF 4407.301.015 WASHER | OEM Genuine Part

Overview

The ZF 4407.301.015 WASHER is an OEM genuine thrust washer engineered to maintain precise axial clearance within the clutch pack assembly of heavy-duty construction machinery transmissions. This hardened steel component sits between the rotating gear set and the stationary housing, absorbing axial loads and preventing metal-on-metal contact during high-torque operation. As a critical wear surface, the SKU 4407.301.015 ensures proper oil film distribution across the clutch plates, directly influencing shift quality and torque transfer efficiency. When installed alongside the 4143101009: HOUSING and 4143301025: HOUSING, this washer forms the foundational boundary for hydraulic pressure containment in the transmission sump.

Symptoms of Failure

• Gradual hydraulic pressure loss – A worn 4407.301.015 washer allows axial play that bleeds clutch apply pressure, causing delayed engagement when shifting from neutral to drive under load.
• Metallic debris in transmission oil – As the hardened surface flakes away, fine steel particles circulate through the system, often detected during routine oil analysis or when inspecting the magnetic drain plug.
• Intermittent gear slipping under heavy load – When the washer thickness reduces beyond tolerance, the clutch pack loses clamping force, resulting in momentary power loss during excavation or grading operations.
• Abnormal low-frequency vibration – Excessive end-play from a collapsed washer creates rhythmic thumping noises from the transmission housing, particularly noticeable at idle in neutral.

Technical Specifications

Compatibility

This thrust washer is dimensionally validated for ZF WG180, WG200, and WG211 powershift transmissions commonly found in wheel loaders, telehandlers, and excavators from 10 to 25 tons operating weight. It also fits select ZF 4WG-200 and 6WG-200 series units produced after 2012. Always verify axial clearance using the 0501342341: SUPPORT RING as a reference gauge during installation. For complete seal replacement, pair this washer with the 4143298457: SEAL KIT to prevent cross-contamination from the torque converter circuit.

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