Multiquip 42090 Gen 3 Hydraulic Expansion Tank - OEM Replacement Part

The Gen 3 hydraulic expansion tank maintains proper hydraulic system pressure and fluid volume in Multiquip ride-on power trowels equipped with hydrostatic drive systems. This tank compensates for thermal expansion of hydraulic oil during operation, preventing pressure spikes that can damage the independent hydrostatic drive motors coupled to the engine-powered hydrostatic pump. As hydraulic fluid heats up during troweling operations, the expansion tank absorbs excess volume and releases it back into the system as temperatures cool, ensuring consistent performance of the dual spider assemblies.

Regular inspection of the hydraulic expansion tank is essential during routine maintenance when checking hydraulic oil reservoir levels. Signs that replacement may be needed include visible cracks, leaking hydraulic fluid, inconsistent trowel performance, or difficulty maintaining proper hydraulic pressure during floating and finishing operations.

Compatible with the following Multiquip ride-on power trowel models:

• HTX6H
• HTXG6DF
• STX6H

Genuine Multiquip OEM part, sold by an authorized dealer.