ZF 4143.351.056 PRESSURE RING | OEM Genuine Part

Overview

The ZF 4143.351.056 PRESSURE RING is a precision-engineered OEM genuine component designed to maintain critical hydraulic pressure within ZF powershift transmissions. This part functions as a sealing and load-bearing element inside the clutch pack assembly, ensuring consistent oil flow and engagement force. The SKU 4143.351.056 is manufactured to ZF’s original specifications for durability under high torque and thermal cycling. It sits directly between the piston and the clutch drum, where it prevents pressure loss during gear shifts. For optimal assembly integrity, this pressure ring is frequently installed alongside the 4143101022 HOUSING and the 4143301044 HOUSING, which form the structural enclosure for the clutch system.

Symptoms of Failure

• Intermittent gear slipping under load: A worn pressure ring cannot maintain hydraulic clamping force, causing the clutch to slip during acceleration or uphill driving.
• Delayed or harsh shifting: When the ring loses its sealing ability, transmission engagement becomes sluggish or jerky, particularly between 2nd and 3rd gears.
• Internal oil leaks and low pressure warnings: Cracks or deformation in the pressure ring allow transmission fluid to bypass the piston, triggering diagnostic trouble codes for low line pressure.
• Metallic debris in the oil pan: Advanced wear can produce fine metal particles from the ring surface, contaminating the hydraulic circuit and damaging adjacent components like the 0631329135 SPRING PIN.

Technical Specifications

Compatibility

This pressure ring is primarily designed for the HL 100 Series and HL 270 Series transmission families. Based on its dimensional characteristics and hydraulic application, it is also compatible with the following ZF models: WG180, WG200, WG210, and WG250 series powershift transmissions. It is commonly used in construction equipment, agricultural tractors, and material handling vehicles. When replacing this ring, always inspect the 0636302014 SCREW PLUG for thread wear and replace the sealing elements to prevent future leaks.

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