ZF 5838.200.080 DIAPHRAGM ACCUMULATOR | OEM Genuine Part

Overview

The ZF 5838.200.080 DIAPHRAGM ACCUMULATOR is a critical hydraulic component engineered to dampen pressure spikes and maintain consistent fluid flow within ZF powershift transmissions. This OEM genuine part, identified by SKU 5838.200.080, sits directly in the transmission’s hydraulic control circuit, where it stores energy and smooths the engagement of clutches and brakes. By absorbing sudden pressure fluctuations, the diaphragm accumulator ensures that gear shifts remain precise and that the transmission operates without harsh jolts. This part is commonly installed alongside the 2093109002: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING to maintain overall drivetrain stability in heavy-duty construction machinery.

Symptoms of Failure

When the diaphragm accumulator begins to wear, operators often notice a gradual loss of hydraulic pressure, leading to delayed or erratic gear engagement. A common failure symptom is transmission oil leaks around the accumulator housing, which can be spotted as drips or puddles under the machine. Another telltale sign is gear slipping under load, where the transmission momentarily loses power during uphill travel or when lifting heavy materials. Additionally, a worn accumulator may cause harsh or clunky shifting as the hydraulic system fails to cushion gear changes. If you experience slow clutch pack response or a persistent whine from the transmission pump, the 5838.200.080 diaphragm should be inspected immediately.

Technical Specifications

Compatibility

This diaphragm accumulator is designed for use in ZF WG series transmissions commonly found in construction machinery such as wheel loaders, graders, and dump trucks. It is a direct fit for the ZF WG180 and ZF WG200 transmission models, as well as the ZF WG210 series. The part also integrates seamlessly with the 2093209095: DIFFERENTIAL and the 2093309071: DIFF.HOUSING to ensure proper torque distribution and hydraulic pressure regulation. Always verify your transmission serial number before ordering to confirm fitment.

Related Components

Frequently Asked Questions

Q: How do I know if my ZF 5838.200.080 diaphragm accumulator is failing?
A: Look for external oil seepage around the accumulator body, a drop in transmission line pressure, or a noticeable delay when shifting from neutral to drive. A simple pressure test using a gauge can confirm if the diaphragm has ruptured.

Q: Can I replace the diaphragm alone, or must I buy the entire accumulator assembly?
A: The ZF 5838.200.080 is sold as a complete sealed unit. Replacing only the internal diaphragm is not recommended due to the risk of improper sealing and contamination. Always install the full OEM assembly for reliable performance.

Q: Is this part compatible with ZF WG180 transmissions used in older construction equipment?
A: Yes, the 5838.200.080 is a direct replacement for WG180, WG200, and WG210 models. However, always cross-reference your transmission’s hydraulic schematic to ensure the accumulator port size matches your system.