ZF 4657.183.197 LOOSE PARTS for WG190 | OEM Genuine Part

Overview

Within the robust architecture of the ZF WG 190 series, the ZF 4657.183.197 LOOSE PARTS kit serves as a critical service package for maintaining internal hydraulic and mechanical integrity. This genuine OEM assembly, identified by SKU 4657.183.197, contains the specific fasteners, seals, and positioning elements required to secure the main housing sections during a rebuild or overhaul. It sits directly between the TRANSMISSION HOUSING and the HOUS.FRONT SECT, ensuring that all mating surfaces remain perfectly aligned under high torque loads. Without this loose parts set, the transmission cannot maintain proper clamping force, leading to fluid migration between chambers.

Symptoms of Failure

When the components within the 4657.183.197 kit degrade or are omitted during service, operators will notice distinct operational failures. The most common symptom is external oil seepage at the housing split line, often mistaken for a gasket failure. You may also experience intermittent gear slippage in forward ranges due to reduced hydraulic pressure caused by internal leakage. Another clear indicator is abnormal vibration during clutch engagement, which stems from loose fasteners allowing the HOUSING REAR PART to shift slightly. Finally, difficulty engaging park lock can occur if the loose parts set fails to secure the detent mechanism properly.

Technical Specifications

Compatibility

This genuine OEM loose parts kit is engineered specifically for the ZF WG 190 series of powershift transmissions. While its primary application is the WG190, the kit also serves the closely related WG180 and WG200 models due to shared housing bolt patterns. It is also compatible with certain iterations of the WG150 and WG210 when used in conjunction with the HOUSING REAR PART (4472239185). Always verify your transmission serial number against the housing casting to confirm fitment, as variations exist between early and late production units.

Related Components

Frequently Asked Questions

Q: Can I reuse the original fasteners from my old transmission instead of buying the 4657.183.197 kit?
A: No. ZF specifies that all fasteners in this loose parts kit are single-use torque-to-yield designs. Reusing them risks improper clamping force, leading to oil leaks and potential housing separation under load.

Q: Does this kit include the gaskets for the housing mating surfaces?
A: This specific SKU (4657.183.197) contains only the loose hardware—bolts, pins, and plates. You must order the corresponding gasket set separately for the WG190 to seal the TRANSMISSION HOUSING and HOUS.FRONT SECT interfaces.

Q: Will this part fix a slipping reverse gear in my WG190?
A: Only if the slippage is caused by internal hydraulic leakage due to loose housing bolts. If the clutches or seals are worn, this kit alone will not resolve the issue. Inspect the HOUSING REAR PART for cracks before proceeding.