The Multiquip M811034 Thermostat 4020Eab Sth55Hp is a genuine OEM component designed for the STX55J6 and STX55Y6 hydrostatic ride-on power trowels. As a direct factory replacement, M811034 ensures the engine cooling system operates within the correct temperature range, protecting the drivetrain and hydraulic system from heat-related stress. Sourced directly from Multiquip, this thermostat is an exact match for the original specification on STX55 series machines.
Key Features
- Genuine OEM Temperature Calibration — Factory-calibrated opening and closing thresholds match the original thermostat's performance envelope, ensuring the engine reaches and holds the correct operating temperature.
- Direct Drop-In Fitment — Engineered to seat correctly in the original housing with matching flange dimensions and seal interface, eliminating guesswork during installation.
- Confirmed STX55 Series Compatibility — Verified fit for STX55J6 and STX55Y6 hydrostatic ride-on trowels, covering both the John Deere and Yanmar diesel-powered variants in the STX55 lineup.
- Protects Engine and Hydraulics Under Load — A properly functioning thermostat keeps coolant flow regulated during heavy finishing passes; a failed or stuck-open thermostat causes under-temperature running that accelerates engine wear and degrades hydraulic fluid performance.
- Fuel System and Emissions Compliance — Correct coolant temperature is required for proper fuel combustion and emissions performance on Tier 4 diesel engines; an out-of-spec thermostat can trigger fault codes and interrupt machine operation.
The thermostat controls coolant flow between the engine block and the radiator, holding coolant inside the block until the engine reaches its designed operating temperature before allowing circulation to the cooling circuit. On hydrostatic ride-on trowels like the STX55 series, stable engine temperature is critical not only for engine longevity but also for consistent hydraulic output, since hydraulic performance is sensitive to heat fluctuations caused by a faulty cooling circuit. A thermostat that sticks open, sticks closed, or opens at the wrong temperature will cause the machine to run outside its designed thermal window, leading to increased wear, reduced power, and potential shutdown.
For fitment questions or to confirm this part is correct for your specific machine configuration, contact the DHS Equipment team directly.
Part Details
| Part Number | M811034 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Thermostat 4020Eab Sth55Hp |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | STX55J6 |
| Whiteman Ride-On Power Trowels | STX55Y6 |
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.
