Multiquip 21639 Yanmar 55HP 4TNV84T-DSA Engine - OEM Replacement Part

This Yanmar 55HP 4TNV84T-DSA diesel engine serves as the primary power plant for ride-on power trowels, delivering reliable hydraulic power to drive the trowel's dual rotor system and control mechanisms. As a complete engine assembly, this component is critical when rebuilding equipment after catastrophic engine failure or when upgrading older units to restore full operational capacity.

The 4TNV84T-DSA is a turbocharged, 4-cylinder industrial diesel engine specifically configured for concrete finishing equipment applications. This engine powers the hydraulic system that controls blade pitch adjustment, steering functions, and rotor speed—all essential for achieving proper concrete surface finishing. The engine interfaces with the electrical system via the 12V DC battery and provides power to operate controls including the blade pitch control switch, twin pitch control, and steering control mechanisms.

This engine is designed for demanding job site conditions and integrates directly with the trowel's hydraulic oil reservoir, suction filter, and control systems referenced in STX-series equipment configurations.

Compatible with the following Multiquip models:

• STX55J6

Genuine Multiquip OEM part, sold by an authorized dealer.