ZF 4657.085.301 5 WG 230 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4657.085.301 5 WG 230 Powershift Transmission Assembly is a complete, factory-grade unit designed for heavy-duty off-highway machinery. This assembly serves as the central power distribution hub within the WG 230 series, managing torque flow across five forward speeds and one reverse range. The SKU 4657.085.301 integrates the main housing, clutch packs, and hydraulic valve body into a single, ready-to-install package. When rebuilding or replacing a worn transmission, this complete unit eliminates the need to source individual internal components, ensuring precise OEM tolerances and immediate operational readiness.

Symptoms of Failure

• Delayed or harsh gear engagement: When the 4657.085.301 assembly loses hydraulic integrity, operators experience a noticeable lag between shifting and actual gear engagement, often accompanied by a jarring clunk.
• Internal oil leaks and pressure loss: Worn seals or cracked housing sections cause transmission fluid to pool externally or bypass internally, leading to sluggish performance and eventual overheating.
• Intermittent gear slipping under load: As clutch packs within the assembly degrade, the transmission slips out of gear when climbing grades or pushing heavy loads, triggering fault codes on the machine’s display.
• Unusual whining or grinding noises: Bearing wear inside the 5 WG 230 assembly produces a high-pitched whine that escalates to a grinding sound, indicating imminent mechanical failure.

Technical Specifications

Compatibility

This complete unit is engineered specifically for the ZF WG 230 series. It is also compatible with the WG 180 and WG 200 series when used as a direct replacement in certain loader and dozer applications, provided the bell housing and output flange match. The 4657.085.301 assembly is commonly found in ZF WG 250 variants as well, though minor adapter modifications may be required. Always verify the original equipment manufacturer’s part number before installation.

Related Components

During installation of the 4657.085.301 assembly, several companion parts must be inspected or replaced. The 4657201161: HOUS.FRONT SECT secures the front bearing cluster, while the 0636115293: 螺栓 fastens the housing halves together. A fresh 0634313603: O-RING prevents fluid leaks at the main joint, and the 0631306816: CYLINDRICAL PIN aligns the clutch drum assembly during reassembly.