Multiquip 12940077012 Starter 55H 4Tnv84T-Dsa

The Multiquip 12940077012 Starter 55H 4Tnv84T-Dsa is a genuine OEM starter designed for the STX55Y6 hydrostatic ride-on power trowel. Sourced directly from Multiquip, this starter is engineered to the exact electrical and mechanical specifications of the original unit, ensuring correct engagement with the 4TNV84T-DSA Yanmar diesel engine. Verified fitment for the STX55Y6 means no guesswork — 12940077012 is the correct part for this machine.

Key Features

• OEM-Matched Electrical Output — Built to the precise voltage and torque specifications required by the 4TNV84T-DSA Yanmar diesel engine, ensuring reliable cranking performance from the first turn of the key.
• Direct-Mount Replacement — Matches the original mounting configuration and pinion engagement of the factory starter, allowing straightforward installation without modification to the starter housing or engine block.
• Confirmed STX55Y6 Fitment — Verified for the Multiquip STX55Y6 super-sized hydrostatic ride-on trowel, so you can order with confidence knowing this is the correct application-specific part.
• Protects Engine Start Integrity — A worn or failed starter causes hard-starting or no-start conditions that halt finishing operations; replacing with the correct OEM unit restores full cranking speed and consistent ignition.
• Electrical Safety Compliance — As a genuine OEM electrical component, this starter meets the original circuit load and wiring harness requirements for the STX55Y6, reducing the risk of electrical faults associated with non-specified replacements.

The starter motor is responsible for cranking the engine each time the machine is powered on, converting electrical energy from the battery into the rotational force needed to turn the engine over and initiate combustion. On a diesel-powered ride-on trowel like the STX55Y6, where consistent startup is critical to maintaining finishing schedules, a properly functioning starter is essential. When a starter begins to fail, symptoms typically include slow or labored cranking, intermittent no-start conditions, or a clicking noise without engine turnover — all of which point to the need for prompt replacement.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.